Merge branch 'feature/editline-pr' of https://github.com/dtzWill/nix

8 files changed, 77 insertions, 4641 deletions

diff --git a/src/linenoise/ConvertUTF.cpp b/src/linenoise/ConvertUTF.cpp
deleted file mode 100644
index f7e5915d5e8f..000000000000
--- a/src/linenoise/ConvertUTF.cpp
+++ /dev/null
@@ -1,542 +0,0 @@
-/*
- * Copyright 2001-2004 Unicode, Inc.
- * 
- * Disclaimer
- * 
- * This source code is provided as is by Unicode, Inc. No claims are
- * made as to fitness for any particular purpose. No warranties of any
- * kind are expressed or implied. The recipient agrees to determine
- * applicability of information provided. If this file has been
- * purchased on magnetic or optical media from Unicode, Inc., the
- * sole remedy for any claim will be exchange of defective media
- * within 90 days of receipt.
- * 
- * Limitations on Rights to Redistribute This Code
- * 
- * Unicode, Inc. hereby grants the right to freely use the information
- * supplied in this file in the creation of products supporting the
- * Unicode Standard, and to make copies of this file in any form
- * for internal or external distribution as long as this notice
- * remains attached.
- */
-
-/* ---------------------------------------------------------------------
-
-    Conversions between UTF32, UTF-16, and UTF-8. Source code file.
-    Author: Mark E. Davis, 1994.
-    Rev History: Rick McGowan, fixes & updates May 2001.
-    Sept 2001: fixed const & error conditions per
-        mods suggested by S. Parent & A. Lillich.
-    June 2002: Tim Dodd added detection and handling of incomplete
-        source sequences, enhanced error detection, added casts
-        to eliminate compiler warnings.
-    July 2003: slight mods to back out aggressive FFFE detection.
-    Jan 2004: updated switches in from-UTF8 conversions.
-    Oct 2004: updated to use UNI_MAX_LEGAL_UTF32 in UTF-32 conversions.
-
-    See the header file "ConvertUTF.h" for complete documentation.
-
------------------------------------------------------------------------- */
-
-#include "ConvertUTF.h"
-#ifdef CVTUTF_DEBUG
-#include <stdio.h>
-#endif
-
-namespace linenoise_ng {
-
-static const int halfShift  = 10; /* used for shifting by 10 bits */
-
-static const UTF32 halfBase = 0x0010000UL;
-static const UTF32 halfMask = 0x3FFUL;
-
-#define UNI_SUR_HIGH_START  (UTF32)0xD800
-#define UNI_SUR_HIGH_END    (UTF32)0xDBFF
-#define UNI_SUR_LOW_START   (UTF32)0xDC00
-#define UNI_SUR_LOW_END     (UTF32)0xDFFF
-#define false      0
-#define true        1
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF32toUTF16 (
-        const UTF32** sourceStart, const UTF32* sourceEnd, 
-        char16_t** targetStart, char16_t* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF32* source = *sourceStart;
-    char16_t* target = *targetStart;
-    while (source < sourceEnd) {
-        UTF32 ch;
-        if (target >= targetEnd) {
-            result = targetExhausted; break;
-        }
-        ch = *source++;
-        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
-            /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */
-            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
-                if (flags == strictConversion) {
-                    --source; /* return to the illegal value itself */
-                    result = sourceIllegal;
-                    break;
-                } else {
-                    *target++ = UNI_REPLACEMENT_CHAR;
-                }
-            } else {
-                *target++ = (UTF16)ch; /* normal case */
-            }
-        } else if (ch > UNI_MAX_LEGAL_UTF32) {
-            if (flags == strictConversion) {
-                result = sourceIllegal;
-            } else {
-                *target++ = UNI_REPLACEMENT_CHAR;
-            }
-        } else {
-            /* target is a character in range 0xFFFF - 0x10FFFF. */
-            if (target + 1 >= targetEnd) {
-                --source; /* Back up source pointer! */
-                result = targetExhausted; break;
-            }
-            ch -= halfBase;
-            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
-            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
-        }
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF16toUTF32 (
-        const UTF16** sourceStart, const UTF16* sourceEnd, 
-        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF16* source = *sourceStart;
-    UTF32* target = *targetStart;
-    UTF32 ch, ch2;
-    while (source < sourceEnd) {
-        const UTF16* oldSource = source; /*  In case we have to back up because of target overflow. */
-        ch = *source++;
-        /* If we have a surrogate pair, convert to UTF32 first. */
-        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
-            /* If the 16 bits following the high surrogate are in the source buffer... */
-            if (source < sourceEnd) {
-                ch2 = *source;
-                /* If it's a low surrogate, convert to UTF32. */
-                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
-                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
-                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
-                    ++source;
-                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
-                    --source; /* return to the illegal value itself */
-                    result = sourceIllegal;
-                    break;
-                }
-            } else { /* We don't have the 16 bits following the high surrogate. */
-                --source; /* return to the high surrogate */
-                result = sourceExhausted;
-                break;
-            }
-        } else if (flags == strictConversion) {
-            /* UTF-16 surrogate values are illegal in UTF-32 */
-            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
-                --source; /* return to the illegal value itself */
-                result = sourceIllegal;
-                break;
-            }
-        }
-        if (target >= targetEnd) {
-            source = oldSource; /* Back up source pointer! */
-            result = targetExhausted; break;
-        }
-        *target++ = ch;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-#ifdef CVTUTF_DEBUG
-if (result == sourceIllegal) {
-    fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);
-    fflush(stderr);
-}
-#endif
-    return result;
-}
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Index into the table below with the first byte of a UTF-8 sequence to
- * get the number of trailing bytes that are supposed to follow it.
- * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
- * left as-is for anyone who may want to do such conversion, which was
- * allowed in earlier algorithms.
- */
-static const char trailingBytesForUTF8[256] = {
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
-};
-
-/*
- * Magic values subtracted from a buffer value during UTF8 conversion.
- * This table contains as many values as there might be trailing bytes
- * in a UTF-8 sequence.
- */
-static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 
-                     0x03C82080UL, 0xFA082080UL, 0x82082080UL };
-
-/*
- * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
- * into the first byte, depending on how many bytes follow.  There are
- * as many entries in this table as there are UTF-8 sequence types.
- * (I.e., one byte sequence, two byte... etc.). Remember that sequencs
- * for *legal* UTF-8 will be 4 or fewer bytes total.
- */
-static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
-
-/* --------------------------------------------------------------------- */
-
-/* The interface converts a whole buffer to avoid function-call overhead.
- * Constants have been gathered. Loops & conditionals have been removed as
- * much as possible for efficiency, in favor of drop-through switches.
- * (See "Note A" at the bottom of the file for equivalent code.)
- * If your compiler supports it, the "isLegalUTF8" call can be turned
- * into an inline function.
- */
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF16toUTF8 (
-        const UTF16** sourceStart, const UTF16* sourceEnd, 
-        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF16* source = *sourceStart;
-    UTF8* target = *targetStart;
-    while (source < sourceEnd) {
-        UTF32 ch;
-        unsigned short bytesToWrite = 0;
-        const UTF32 byteMask = 0xBF;
-        const UTF32 byteMark = 0x80; 
-        const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */
-        ch = *source++;
-        /* If we have a surrogate pair, convert to UTF32 first. */
-        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
-            /* If the 16 bits following the high surrogate are in the source buffer... */
-            if (source < sourceEnd) {
-                UTF32 ch2 = *source;
-                /* If it's a low surrogate, convert to UTF32. */
-                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
-                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
-                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
-                    ++source;
-                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
-                    --source; /* return to the illegal value itself */
-                    result = sourceIllegal;
-                    break;
-                }
-            } else { /* We don't have the 16 bits following the high surrogate. */
-                --source; /* return to the high surrogate */
-                result = sourceExhausted;
-                break;
-            }
-        } else if (flags == strictConversion) {
-            /* UTF-16 surrogate values are illegal in UTF-32 */
-            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
-                --source; /* return to the illegal value itself */
-                result = sourceIllegal;
-                break;
-            }
-        }
-        /* Figure out how many bytes the result will require */
-        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
-        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
-        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
-        } else if (ch < (UTF32)0x110000) {  bytesToWrite = 4;
-        } else {                            bytesToWrite = 3;
-                                            ch = UNI_REPLACEMENT_CHAR;
-        }
-
-        target += bytesToWrite;
-        if (target > targetEnd) {
-            source = oldSource; /* Back up source pointer! */
-            target -= bytesToWrite; result = targetExhausted; break;
-        }
-        switch (bytesToWrite) { /* note: everything falls through. */
-            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 1: *--target =  (UTF8)(ch | firstByteMark[bytesToWrite]);
-        }
-        target += bytesToWrite;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Utility routine to tell whether a sequence of bytes is legal UTF-8.
- * This must be called with the length pre-determined by the first byte.
- * If not calling this from ConvertUTF8to*, then the length can be set by:
- *  length = trailingBytesForUTF8[*source]+1;
- * and the sequence is illegal right away if there aren't that many bytes
- * available.
- * If presented with a length > 4, this returns false.  The Unicode
- * definition of UTF-8 goes up to 4-byte sequences.
- */
-
-static Boolean isLegalUTF8(const UTF8 *source, int length) {
-    UTF8 a;
-    const UTF8 *srcptr = source+length;
-    switch (length) {
-    default: return false;
-        /* Everything else falls through when "true"... */
-    case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
-    case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
-    case 2: if ((a = (*--srcptr)) > 0xBF) return false;
-
-        switch (*source) {
-            /* no fall-through in this inner switch */
-            case 0xE0: if (a < 0xA0) return false; break;
-            case 0xED: if (a > 0x9F) return false; break;
-            case 0xF0: if (a < 0x90) return false; break;
-            case 0xF4: if (a > 0x8F) return false; break;
-            default:   if (a < 0x80) return false;
-        }
-
-    case 1: if (*source >= 0x80 && *source < 0xC2) return false;
-    }
-    if (*source > 0xF4) return false;
-    return true;
-}
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Exported function to return whether a UTF-8 sequence is legal or not.
- * This is not used here; it's just exported.
- */
-Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
-    int length = trailingBytesForUTF8[*source]+1;
-    if (source+length > sourceEnd) {
-        return false;
-    }
-    return isLegalUTF8(source, length);
-}
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF8toUTF16 (
-        const UTF8** sourceStart, const UTF8* sourceEnd, 
-        UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF8* source = *sourceStart;
-    UTF16* target = *targetStart;
-    while (source < sourceEnd) {
-        UTF32 ch = 0;
-        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
-        if (source + extraBytesToRead >= sourceEnd) {
-            result = sourceExhausted; break;
-        }
-        /* Do this check whether lenient or strict */
-        if (! isLegalUTF8(source, extraBytesToRead+1)) {
-            result = sourceIllegal;
-            break;
-        }
-        /*
-         * The cases all fall through. See "Note A" below.
-         */
-        switch (extraBytesToRead) {
-            case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
-            case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
-            case 3: ch += *source++; ch <<= 6;
-            case 2: ch += *source++; ch <<= 6;
-            case 1: ch += *source++; ch <<= 6;
-            case 0: ch += *source++;
-        }
-        ch -= offsetsFromUTF8[extraBytesToRead];
-
-        if (target >= targetEnd) {
-            source -= (extraBytesToRead+1); /* Back up source pointer! */
-            result = targetExhausted; break;
-        }
-        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
-            /* UTF-16 surrogate values are illegal in UTF-32 */
-            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
-                if (flags == strictConversion) {
-                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
-                    result = sourceIllegal;
-                    break;
-                } else {
-                    *target++ = UNI_REPLACEMENT_CHAR;
-                }
-            } else {
-                *target++ = (UTF16)ch; /* normal case */
-            }
-        } else if (ch > UNI_MAX_UTF16) {
-            if (flags == strictConversion) {
-                result = sourceIllegal;
-                source -= (extraBytesToRead+1); /* return to the start */
-                break; /* Bail out; shouldn't continue */
-            } else {
-                *target++ = UNI_REPLACEMENT_CHAR;
-            }
-        } else {
-            /* target is a character in range 0xFFFF - 0x10FFFF. */
-            if (target + 1 >= targetEnd) {
-                source -= (extraBytesToRead+1); /* Back up source pointer! */
-                result = targetExhausted; break;
-            }
-            ch -= halfBase;
-            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
-            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
-        }
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF32toUTF8 (
-        const UTF32** sourceStart, const UTF32* sourceEnd, 
-        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF32* source = *sourceStart;
-    UTF8* target = *targetStart;
-    while (source < sourceEnd) {
-        UTF32 ch;
-        unsigned short bytesToWrite = 0;
-        const UTF32 byteMask = 0xBF;
-        const UTF32 byteMark = 0x80; 
-        ch = *source++;
-        if (flags == strictConversion ) {
-            /* UTF-16 surrogate values are illegal in UTF-32 */
-            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
-                --source; /* return to the illegal value itself */
-                result = sourceIllegal;
-                break;
-            }
-        }
-        /*
-         * Figure out how many bytes the result will require. Turn any
-         * illegally large UTF32 things (> Plane 17) into replacement chars.
-         */
-        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
-        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
-        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
-        } else if (ch <= UNI_MAX_LEGAL_UTF32) {  bytesToWrite = 4;
-        } else {                            bytesToWrite = 3;
-                                            ch = UNI_REPLACEMENT_CHAR;
-                                            result = sourceIllegal;
-        }
-        
-        target += bytesToWrite;
-        if (target > targetEnd) {
-            --source; /* Back up source pointer! */
-            target -= bytesToWrite; result = targetExhausted; break;
-        }
-        switch (bytesToWrite) { /* note: everything falls through. */
-            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
-            case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
-        }
-        target += bytesToWrite;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-/* --------------------------------------------------------------------- */
-
-ConversionResult ConvertUTF8toUTF32 (
-        const UTF8** sourceStart, const UTF8* sourceEnd, 
-        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
-    ConversionResult result = conversionOK;
-    const UTF8* source = *sourceStart;
-    UTF32* target = *targetStart;
-    while (source < sourceEnd) {
-        UTF32 ch = 0;
-        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
-        if (source + extraBytesToRead >= sourceEnd) {
-            result = sourceExhausted; break;
-        }
-        /* Do this check whether lenient or strict */
-        if (! isLegalUTF8(source, extraBytesToRead+1)) {
-            result = sourceIllegal;
-            break;
-        }
-        /*
-         * The cases all fall through. See "Note A" below.
-         */
-        switch (extraBytesToRead) {
-            case 5: ch += *source++; ch <<= 6;
-            case 4: ch += *source++; ch <<= 6;
-            case 3: ch += *source++; ch <<= 6;
-            case 2: ch += *source++; ch <<= 6;
-            case 1: ch += *source++; ch <<= 6;
-            case 0: ch += *source++;
-        }
-        ch -= offsetsFromUTF8[extraBytesToRead];
-
-        if (target >= targetEnd) {
-            source -= (extraBytesToRead+1); /* Back up the source pointer! */
-            result = targetExhausted; break;
-        }
-        if (ch <= UNI_MAX_LEGAL_UTF32) {
-            /*
-             * UTF-16 surrogate values are illegal in UTF-32, and anything
-             * over Plane 17 (> 0x10FFFF) is illegal.
-             */
-            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
-                if (flags == strictConversion) {
-                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
-                    result = sourceIllegal;
-                    break;
-                } else {
-                    *target++ = UNI_REPLACEMENT_CHAR;
-                }
-            } else {
-                *target++ = ch;
-            }
-        } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */
-            result = sourceIllegal;
-            *target++ = UNI_REPLACEMENT_CHAR;
-        }
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-}
-
-/* ---------------------------------------------------------------------
-
-    Note A.
-    The fall-through switches in UTF-8 reading code save a
-    temp variable, some decrements & conditionals.  The switches
-    are equivalent to the following loop:
-        {
-            int tmpBytesToRead = extraBytesToRead+1;
-            do {
-                ch += *source++;
-                --tmpBytesToRead;
-                if (tmpBytesToRead) ch <<= 6;
-            } while (tmpBytesToRead > 0);
-        }
-    In UTF-8 writing code, the switches on "bytesToWrite" are
-    similarly unrolled loops.
-
-   --------------------------------------------------------------------- */
diff --git a/src/linenoise/ConvertUTF.h b/src/linenoise/ConvertUTF.h
deleted file mode 100755
index 8a296235dcd9..000000000000
--- a/src/linenoise/ConvertUTF.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/*
- * Copyright 2001-2004 Unicode, Inc.
- * 
- * Disclaimer
- * 
- * This source code is provided as is by Unicode, Inc. No claims are
- * made as to fitness for any particular purpose. No warranties of any
- * kind are expressed or implied. The recipient agrees to determine
- * applicability of information provided. If this file has been
- * purchased on magnetic or optical media from Unicode, Inc., the
- * sole remedy for any claim will be exchange of defective media
- * within 90 days of receipt.
- * 
- * Limitations on Rights to Redistribute This Code
- * 
- * Unicode, Inc. hereby grants the right to freely use the information
- * supplied in this file in the creation of products supporting the
- * Unicode Standard, and to make copies of this file in any form
- * for internal or external distribution as long as this notice
- * remains attached.
- */
-
-/* ---------------------------------------------------------------------
-
-    Conversions between UTF32, UTF-16, and UTF-8.  Header file.
-
-    Several funtions are included here, forming a complete set of
-    conversions between the three formats.  UTF-7 is not included
-    here, but is handled in a separate source file.
-
-    Each of these routines takes pointers to input buffers and output
-    buffers.  The input buffers are const.
-
-    Each routine converts the text between *sourceStart and sourceEnd,
-    putting the result into the buffer between *targetStart and
-    targetEnd. Note: the end pointers are *after* the last item: e.g. 
-    *(sourceEnd - 1) is the last item.
-
-    The return result indicates whether the conversion was successful,
-    and if not, whether the problem was in the source or target buffers.
-    (Only the first encountered problem is indicated.)
-
-    After the conversion, *sourceStart and *targetStart are both
-    updated to point to the end of last text successfully converted in
-    the respective buffers.
-
-    Input parameters:
-        sourceStart - pointer to a pointer to the source buffer.
-                The contents of this are modified on return so that
-                it points at the next thing to be converted.
-        targetStart - similarly, pointer to pointer to the target buffer.
-        sourceEnd, targetEnd - respectively pointers to the ends of the
-                two buffers, for overflow checking only.
-
-    These conversion functions take a ConversionFlags argument. When this
-    flag is set to strict, both irregular sequences and isolated surrogates
-    will cause an error.  When the flag is set to lenient, both irregular
-    sequences and isolated surrogates are converted.
-
-    Whether the flag is strict or lenient, all illegal sequences will cause
-    an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
-    or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
-    must check for illegal sequences.
-
-    When the flag is set to lenient, characters over 0x10FFFF are converted
-    to the replacement character; otherwise (when the flag is set to strict)
-    they constitute an error.
-
-    Output parameters:
-        The value "sourceIllegal" is returned from some routines if the input
-        sequence is malformed.  When "sourceIllegal" is returned, the source
-        value will point to the illegal value that caused the problem. E.g.,
-        in UTF-8 when a sequence is malformed, it points to the start of the
-        malformed sequence.  
-
-    Author: Mark E. Davis, 1994.
-    Rev History: Rick McGowan, fixes & updates May 2001.
-                 Fixes & updates, Sept 2001.
-
------------------------------------------------------------------------- */
-
-/* ---------------------------------------------------------------------
-    The following 4 definitions are compiler-specific.
-    The C standard does not guarantee that wchar_t has at least
-    16 bits, so wchar_t is no less portable than unsigned short!
-    All should be unsigned values to avoid sign extension during
-    bit mask & shift operations.
------------------------------------------------------------------------- */
-
-#if 0
-typedef unsigned long  UTF32; /* at least 32 bits */
-typedef unsigned short UTF16; /* at least 16 bits */
-typedef unsigned char  UTF8;  /* typically 8 bits */
-#endif
-
-#include <stdint.h>
-#include <string>
-
-namespace linenoise_ng {
-
-typedef uint32_t         UTF32;
-typedef uint16_t         UTF16;
-typedef uint8_t          UTF8;
-typedef unsigned char    Boolean; /* 0 or 1 */
-
-/* Some fundamental constants */
-#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
-#define UNI_MAX_BMP (UTF32)0x0000FFFF
-#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
-#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
-#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
-
-typedef enum {
-        conversionOK,           /* conversion successful */
-        sourceExhausted,        /* partial character in source, but hit end */
-        targetExhausted,        /* insuff. room in target for conversion */
-        sourceIllegal           /* source sequence is illegal/malformed */
-} ConversionResult;
-
-typedef enum {
-        strictConversion = 0,
-        lenientConversion
-} ConversionFlags;
-
-// /* This is for C++ and does no harm in C */
-// #ifdef __cplusplus
-// extern "C" {
-// #endif
-
-ConversionResult ConvertUTF8toUTF16 (
-                const UTF8** sourceStart, const UTF8* sourceEnd, 
-                UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
-
-ConversionResult ConvertUTF16toUTF8 (
-                const UTF16** sourceStart, const UTF16* sourceEnd, 
-                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
-                
-ConversionResult ConvertUTF8toUTF32 (
-                const UTF8** sourceStart, const UTF8* sourceEnd, 
-                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
-
-ConversionResult ConvertUTF32toUTF8 (
-                const UTF32** sourceStart, const UTF32* sourceEnd, 
-                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
-                
-ConversionResult ConvertUTF16toUTF32 (
-                const UTF16** sourceStart, const UTF16* sourceEnd, 
-                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
-
-ConversionResult ConvertUTF32toUTF16 (
-                const UTF32** sourceStart, const UTF32* sourceEnd, 
-                char16_t** targetStart, char16_t* targetEnd, ConversionFlags flags);
-
-Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
-
-// #ifdef __cplusplus
-// }
-// #endif
-
-}
-
-/* --------------------------------------------------------------------- */
diff --git a/src/linenoise/LICENSE b/src/linenoise/LICENSE
deleted file mode 100644
index b7c58c445860..000000000000
--- a/src/linenoise/LICENSE
+++ /dev/null
@@ -1,66 +0,0 @@
-linenoise.cpp
-=============
-
-Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
-Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-  * Redistributions of source code must retain the above copyright notice,
-    this list of conditions and the following disclaimer.
-  * Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
-  * Neither the name of Redis nor the names of its contributors may be used
-    to endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-
-
-wcwidth.cpp
-===========
-
-Markus Kuhn -- 2007-05-26 (Unicode 5.0)
-
-Permission to use, copy, modify, and distribute this software
-for any purpose and without fee is hereby granted. The author
-disclaims all warranties with regard to this software.
-
-
-
-ConvertUTF.cpp
-==============
-
-Copyright 2001-2004 Unicode, Inc.
- 
-Disclaimer
- 
-This source code is provided as is by Unicode, Inc. No claims are
-made as to fitness for any particular purpose. No warranties of any
-kind are expressed or implied. The recipient agrees to determine
-applicability of information provided. If this file has been
-purchased on magnetic or optical media from Unicode, Inc., the
-sole remedy for any claim will be exchange of defective media
-within 90 days of receipt.
- 
-Limitations on Rights to Redistribute This Code
- 
-Unicode, Inc. hereby grants the right to freely use the information
-supplied in this file in the creation of products supporting the
-Unicode Standard, and to make copies of this file in any form
-for internal or external distribution as long as this notice
-remains attached.
diff --git a/src/linenoise/linenoise.cpp b/src/linenoise/linenoise.cpp
deleted file mode 100644
index c57505d2fa97..000000000000
--- a/src/linenoise/linenoise.cpp
+++ /dev/null
@@ -1,3450 +0,0 @@
-/* linenoise.c -- guerrilla line editing library against the idea that a
- * line editing lib needs to be 20,000 lines of C code.
- *
- * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   * Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *   * Neither the name of Redis nor the names of its contributors may be used
- *     to endorse or promote products derived from this software without
- *     specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * line editing lib needs to be 20,000 lines of C code.
- *
- * You can find the latest source code at:
- *
- *   http://github.com/antirez/linenoise
- *
- * Does a number of crazy assumptions that happen to be true in 99.9999% of
- * the 2010 UNIX computers around.
- *
- * References:
- * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
- * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
- *
- * Todo list:
- * - Switch to gets() if $TERM is something we can't support.
- * - Filter bogus Ctrl+<char> combinations.
- * - Win32 support
- *
- * Bloat:
- * - Completion?
- * - History search like Ctrl+r in readline?
- *
- * List of escape sequences used by this program, we do everything just
- * with three sequences. In order to be so cheap we may have some
- * flickering effect with some slow terminal, but the lesser sequences
- * the more compatible.
- *
- * CHA (Cursor Horizontal Absolute)
- *    Sequence: ESC [ n G
- *    Effect: moves cursor to column n (1 based)
- *
- * EL (Erase Line)
- *    Sequence: ESC [ n K
- *    Effect: if n is 0 or missing, clear from cursor to end of line
- *    Effect: if n is 1, clear from beginning of line to cursor
- *    Effect: if n is 2, clear entire line
- *
- * CUF (Cursor Forward)
- *    Sequence: ESC [ n C
- *    Effect: moves cursor forward of n chars
- *
- * The following are used to clear the screen: ESC [ H ESC [ 2 J
- * This is actually composed of two sequences:
- *
- * cursorhome
- *    Sequence: ESC [ H
- *    Effect: moves the cursor to upper left corner
- *
- * ED2 (Clear entire screen)
- *    Sequence: ESC [ 2 J
- *    Effect: clear the whole screen
- *
- */
-
-#ifdef _WIN32
-
-#include <conio.h>
-#include <windows.h>
-#include <io.h>
-
-#if defined(_MSC_VER) && _MSC_VER < 1900
-#define snprintf _snprintf  // Microsoft headers use underscores in some names
-#endif
-
-#if !defined GNUC
-#define strcasecmp _stricmp
-#endif
-
-#define strdup _strdup
-#define isatty _isatty
-#define write _write
-#define STDIN_FILENO 0
-
-#else /* _WIN32 */
-
-#include <signal.h>
-#include <termios.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <cctype>
-#include <wctype.h>
-
-#endif /* _WIN32 */
-
-#include <stdio.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include "linenoise.h"
-#include "ConvertUTF.h"
-
-#include <string>
-#include <vector>
-#include <memory>
-
-using std::string;
-using std::vector;
-using std::unique_ptr;
-using namespace linenoise_ng;
-
-typedef unsigned char char8_t;
-
-static ConversionResult copyString8to32(char32_t* dst, size_t dstSize,
-                                        size_t& dstCount, const char* src) {
-  const UTF8* sourceStart = reinterpret_cast<const UTF8*>(src);
-  const UTF8* sourceEnd = sourceStart + strlen(src);
-  UTF32* targetStart = reinterpret_cast<UTF32*>(dst);
-  UTF32* targetEnd = targetStart + dstSize;
-
-  ConversionResult res = ConvertUTF8toUTF32(
-      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
-
-  if (res == conversionOK) {
-    dstCount = targetStart - reinterpret_cast<UTF32*>(dst);
-
-    if (dstCount < dstSize) {
-      *targetStart = 0;
-    }
-  }
-
-  return res;
-}
-
-static ConversionResult copyString8to32(char32_t* dst, size_t dstSize,
-                                        size_t& dstCount, const char8_t* src) {
-  return copyString8to32(dst, dstSize, dstCount,
-                         reinterpret_cast<const char*>(src));
-}
-
-static size_t strlen32(const char32_t* str) {
-  const char32_t* ptr = str;
-
-  while (*ptr) {
-    ++ptr;
-  }
-
-  return ptr - str;
-}
-
-static size_t strlen8(const char8_t* str) {
-  return strlen(reinterpret_cast<const char*>(str));
-}
-
-static char8_t* strdup8(const char* src) {
-  return reinterpret_cast<char8_t*>(strdup(src));
-}
-
-#ifdef _WIN32
-static const int FOREGROUND_WHITE =
-    FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
-static const int BACKGROUND_WHITE =
-    BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE;
-static const int INTENSITY = FOREGROUND_INTENSITY | BACKGROUND_INTENSITY;
-
-class WinAttributes {
- public:
-  WinAttributes() {
-    CONSOLE_SCREEN_BUFFER_INFO info;
-    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info);
-    _defaultAttribute = info.wAttributes & INTENSITY;
-    _defaultColor = info.wAttributes & FOREGROUND_WHITE;
-    _defaultBackground = info.wAttributes & BACKGROUND_WHITE;
-
-    _consoleAttribute = _defaultAttribute;
-    _consoleColor = _defaultColor | _defaultBackground;
-  }
-
- public:
-  int _defaultAttribute;
-  int _defaultColor;
-  int _defaultBackground;
-
-  int _consoleAttribute;
-  int _consoleColor;
-};
-
-static WinAttributes WIN_ATTR;
-
-static void copyString32to16(char16_t* dst, size_t dstSize, size_t* dstCount,
-                             const char32_t* src, size_t srcSize) {
-  const UTF32* sourceStart = reinterpret_cast<const UTF32*>(src);
-  const UTF32* sourceEnd = sourceStart + srcSize;
-  char16_t* targetStart = reinterpret_cast<char16_t*>(dst);
-  char16_t* targetEnd = targetStart + dstSize;
-
-  ConversionResult res = ConvertUTF32toUTF16(
-      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
-
-  if (res == conversionOK) {
-    *dstCount = targetStart - reinterpret_cast<char16_t*>(dst);
-
-    if (*dstCount < dstSize) {
-      *targetStart = 0;
-    }
-  }
-}
-#endif
-
-static void copyString32to8(char* dst, size_t dstSize, size_t* dstCount,
-                            const char32_t* src, size_t srcSize) {
-  const UTF32* sourceStart = reinterpret_cast<const UTF32*>(src);
-  const UTF32* sourceEnd = sourceStart + srcSize;
-  UTF8* targetStart = reinterpret_cast<UTF8*>(dst);
-  UTF8* targetEnd = targetStart + dstSize;
-
-  ConversionResult res = ConvertUTF32toUTF8(
-      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
-
-  if (res == conversionOK) {
-    *dstCount = targetStart - reinterpret_cast<UTF8*>(dst);
-
-    if (*dstCount < dstSize) {
-      *targetStart = 0;
-    }
-  }
-}
-
-static void copyString32to8(char* dst, size_t dstLen, const char32_t* src) {
-  size_t dstCount = 0;
-  copyString32to8(dst, dstLen, &dstCount, src, strlen32(src));
-}
-
-static void copyString32(char32_t* dst, const char32_t* src, size_t len) {
-  while (0 < len && *src) {
-    *dst++ = *src++;
-    --len;
-  }
-
-  *dst = 0;
-}
-
-static int strncmp32(const char32_t* left, const char32_t* right, size_t len) {
-  while (0 < len && *left) {
-    if (*left != *right) {
-      return *left - *right;
-    }
-
-    ++left;
-    ++right;
-    --len;
-  }
-
-  return 0;
-}
-
-#ifdef _WIN32
-#include <iostream>
-
-static size_t OutputWin(char16_t* text16, char32_t* text32, size_t len32) {
-  size_t count16 = 0;
-
-  copyString32to16(text16, len32, &count16, text32, len32);
-  WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), text16,
-                static_cast<DWORD>(count16), nullptr, nullptr);
-
-  return count16;
-}
-
-static char32_t* HandleEsc(char32_t* p, char32_t* end) {
-  if (*p == '[') {
-    int code = 0;
-
-    for (++p; p < end; ++p) {
-      char32_t c = *p;
-
-      if ('0' <= c && c <= '9') {
-        code = code * 10 + (c - '0');
-      } else if (c == 'm' || c == ';') {
-        switch (code) {
-          case 0:
-            WIN_ATTR._consoleAttribute = WIN_ATTR._defaultAttribute;
-            WIN_ATTR._consoleColor =
-                WIN_ATTR._defaultColor | WIN_ATTR._defaultBackground;
-            break;
-
-          case 1:  // BOLD
-          case 5:  // BLINK
-            WIN_ATTR._consoleAttribute =
-                (WIN_ATTR._defaultAttribute ^ FOREGROUND_INTENSITY) & INTENSITY;
-            break;
-
-          case 30:
-            WIN_ATTR._consoleColor = BACKGROUND_WHITE;
-            break;
-
-          case 31:
-            WIN_ATTR._consoleColor =
-                FOREGROUND_RED | WIN_ATTR._defaultBackground;
-            break;
-
-          case 32:
-            WIN_ATTR._consoleColor =
-                FOREGROUND_GREEN | WIN_ATTR._defaultBackground;
-            break;
-
-          case 33:
-            WIN_ATTR._consoleColor =
-                FOREGROUND_RED | FOREGROUND_GREEN | WIN_ATTR._defaultBackground;
-            break;
-
-          case 34:
-            WIN_ATTR._consoleColor =
-                FOREGROUND_BLUE | WIN_ATTR._defaultBackground;
-            break;
-
-          case 35:
-            WIN_ATTR._consoleColor =
-                FOREGROUND_BLUE | FOREGROUND_RED | WIN_ATTR._defaultBackground;
-            break;
-
-          case 36:
-            WIN_ATTR._consoleColor = FOREGROUND_BLUE | FOREGROUND_GREEN |
-                                     WIN_ATTR._defaultBackground;
-            break;
-
-          case 37:
-            WIN_ATTR._consoleColor = FOREGROUND_GREEN | FOREGROUND_RED |
-                                     FOREGROUND_BLUE |
-                                     WIN_ATTR._defaultBackground;
-            break;
-        }
-
-        code = 0;
-      }
-
-      if (*p == 'm') {
-        ++p;
-        break;
-      }
-    }
-  } else {
-    ++p;
-  }
-
-  auto handle = GetStdHandle(STD_OUTPUT_HANDLE);
-  SetConsoleTextAttribute(handle,
-                          WIN_ATTR._consoleAttribute | WIN_ATTR._consoleColor);
-
-  return p;
-}
-
-static size_t WinWrite32(char16_t* text16, char32_t* text32, size_t len32) {
-  char32_t* p = text32;
-  char32_t* q = p;
-  char32_t* e = text32 + len32;
-  size_t count16 = 0;
-
-  while (p < e) {
-    if (*p == 27) {
-      if (q < p) {
-        count16 += OutputWin(text16, q, p - q);
-      }
-
-      q = p = HandleEsc(p + 1, e);
-    } else {
-      ++p;
-    }
-  }
-
-  if (q < p) {
-    count16 += OutputWin(text16, q, p - q);
-  }
-
-  return count16;
-}
-#endif
-
-static int write32(int fd, char32_t* text32, int len32) {
-#ifdef _WIN32
-  if (isatty(fd)) {
-    size_t len16 = 2 * len32 + 1;
-    unique_ptr<char16_t[]> text16(new char16_t[len16]);
-    size_t count16 = WinWrite32(text16.get(), text32, len32);
-
-    return static_cast<int>(count16);
-  } else {
-    size_t len8 = 4 * len32 + 1;
-    unique_ptr<char[]> text8(new char[len8]);
-    size_t count8 = 0;
-
-    copyString32to8(text8.get(), len8, &count8, text32, len32);
-
-    return write(fd, text8.get(), static_cast<unsigned int>(count8));
-  }
-#else
-  size_t len8 = 4 * len32 + 1;
-  unique_ptr<char[]> text8(new char[len8]);
-  size_t count8 = 0;
-
-  copyString32to8(text8.get(), len8, &count8, text32, len32);
-
-  return write(fd, text8.get(), count8);
-#endif
-}
-
-class Utf32String {
- public:
-  Utf32String() : _length(0), _data(nullptr) { 
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[1](); 
-  }
-
-  explicit Utf32String(const char* src) : _length(0), _data(nullptr) {
-    size_t len = strlen(src);
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[len + 1]();
-    copyString8to32(_data, len + 1, _length, src);
-  }
-
-  explicit Utf32String(const char8_t* src) : _length(0), _data(nullptr) {
-    size_t len = strlen(reinterpret_cast<const char*>(src));
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[len + 1]();
-    copyString8to32(_data, len + 1, _length, src);
-  }
-
-  explicit Utf32String(const char32_t* src) : _length(0), _data(nullptr) {
-    for (_length = 0; src[_length] != 0; ++_length) {
-    }
-
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[_length + 1]();
-    memcpy(_data, src, _length * sizeof(char32_t));
-  }
-
-  explicit Utf32String(const char32_t* src, int len) : _length(len), _data(nullptr) {
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[len + 1]();
-    memcpy(_data, src, len * sizeof(char32_t));
-  }
-
-  explicit Utf32String(int len) : _length(0), _data(nullptr) { 
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[len](); 
-  }
-
-  explicit Utf32String(const Utf32String& that) : _length(that._length), _data(nullptr) {
-    // note: parens intentional, _data must be properly initialized
-    _data = new char32_t[_length + 1]();
-    memcpy(_data, that._data, sizeof(char32_t) * _length);
-  }
-
-  Utf32String& operator=(const Utf32String& that) {
-    if (this != &that) {
-      delete[] _data;
-      _data = new char32_t[that._length]();
-      _length = that._length;
-      memcpy(_data, that._data, sizeof(char32_t) * _length);
-    }
-
-    return *this;
-  }
-
-  ~Utf32String() { delete[] _data; }
-
- public:
-  char32_t* get() const { return _data; }
-
-  size_t length() const { return _length; }
-
-  size_t chars() const { return _length; }
-
-  void initFromBuffer() {
-    for (_length = 0; _data[_length] != 0; ++_length) {
-    }
-  }
-
-  const char32_t& operator[](size_t pos) const { return _data[pos]; }
-
-  char32_t& operator[](size_t pos) { return _data[pos]; }
-
- private:
-  size_t _length;
-  char32_t* _data;
-};
-
-class Utf8String {
-  Utf8String(const Utf8String&) = delete;
-  Utf8String& operator=(const Utf8String&) = delete;
-
- public:
-  explicit Utf8String(const Utf32String& src) {
-    size_t len = src.length() * 4 + 1;
-    _data = new char[len];
-    copyString32to8(_data, len, src.get());
-  }
-
-  ~Utf8String() { delete[] _data; }
-
- public:
-  char* get() const { return _data; }
-
- private:
-  char* _data;
-};
-
-struct linenoiseCompletions {
-  vector<Utf32String> completionStrings;
-};
-
-#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
-#define LINENOISE_MAX_LINE 4096
-
-// make control-characters more readable
-#define ctrlChar(upperCaseASCII) (upperCaseASCII - 0x40)
-
-/**
- * Recompute widths of all characters in a char32_t buffer
- * @param text          input buffer of Unicode characters
- * @param widths        output buffer of character widths
- * @param charCount     number of characters in buffer
- */
-namespace linenoise_ng {
-int mk_wcwidth(char32_t ucs);
-}
-
-static void recomputeCharacterWidths(const char32_t* text, char* widths,
-                                     int charCount) {
-  for (int i = 0; i < charCount; ++i) {
-    widths[i] = mk_wcwidth(text[i]);
-  }
-}
-
-/**
- * Calculate a new screen position given a starting position, screen width and
- * character count
- * @param x             initial x position (zero-based)
- * @param y             initial y position (zero-based)
- * @param screenColumns screen column count
- * @param charCount     character positions to advance
- * @param xOut          returned x position (zero-based)
- * @param yOut          returned y position (zero-based)
- */
-static void calculateScreenPosition(int x, int y, int screenColumns,
-                                    int charCount, int& xOut, int& yOut) {
-  xOut = x;
-  yOut = y;
-  int charsRemaining = charCount;
-  while (charsRemaining > 0) {
-    int charsThisRow = (x + charsRemaining < screenColumns) ? charsRemaining
-                                                            : screenColumns - x;
-    xOut = x + charsThisRow;
-    yOut = y;
-    charsRemaining -= charsThisRow;
-    x = 0;
-    ++y;
-  }
-  if (xOut == screenColumns) {  // we have to special-case line wrap
-    xOut = 0;
-    ++yOut;
-  }
-}
-
-/**
- * Calculate a column width using mk_wcswidth()
- * @param buf32  text to calculate
- * @param len    length of text to calculate
- */
-namespace linenoise_ng {
-int mk_wcswidth(const char32_t* pwcs, size_t n);
-}
-
-static int calculateColumnPosition(char32_t* buf32, int len) {
-  int width = mk_wcswidth(reinterpret_cast<const char32_t*>(buf32), len);
-  if (width == -1)
-    return len;
-  else
-    return width;
-}
-
-static bool isControlChar(char32_t testChar) {
-  return (testChar < ' ') ||                      // C0 controls
-         (testChar >= 0x7F && testChar <= 0x9F);  // DEL and C1 controls
-}
-
-struct PromptBase {            // a convenience struct for grouping prompt info
-  Utf32String promptText;      // our copy of the prompt text, edited
-  char* promptCharWidths;      // character widths from mk_wcwidth()
-  int promptChars;             // chars in promptText
-  int promptBytes;             // bytes in promptText
-  int promptExtraLines;        // extra lines (beyond 1) occupied by prompt
-  int promptIndentation;       // column offset to end of prompt
-  int promptLastLinePosition;  // index into promptText where last line begins
-  int promptPreviousInputLen;  // promptChars of previous input line, for
-                               // clearing
-  int promptCursorRowOffset;   // where the cursor is relative to the start of
-                               // the prompt
-  int promptScreenColumns;     // width of screen in columns
-  int promptPreviousLen;       // help erasing
-  int promptErrorCode;         // error code (invalid UTF-8) or zero
-
-  PromptBase() : promptPreviousInputLen(0) {}
-
-  bool write() {
-    if (write32(1, promptText.get(), promptBytes) == -1) return false;
-
-    return true;
-  }
-};
-
-struct PromptInfo : public PromptBase {
-  PromptInfo(const char* textPtr, int columns) {
-    promptExtraLines = 0;
-    promptLastLinePosition = 0;
-    promptPreviousLen = 0;
-    promptScreenColumns = columns;
-    Utf32String tempUnicode(textPtr);
-
-    // strip control characters from the prompt -- we do allow newline
-    char32_t* pIn = tempUnicode.get();
-    char32_t* pOut = pIn;
-
-    int len = 0;
-    int x = 0;
-
-    bool const strip = (isatty(1) == 0);
-
-    while (*pIn) {
-      char32_t c = *pIn;
-      if ('\n' == c || !isControlChar(c)) {
-        *pOut = c;
-        ++pOut;
-        ++pIn;
-        ++len;
-        if ('\n' == c || ++x >= promptScreenColumns) {
-          x = 0;
-          ++promptExtraLines;
-          promptLastLinePosition = len;
-        }
-      } else if (c == '\x1b') {
-        if (strip) {
-          // jump over control chars
-          ++pIn;
-          if (*pIn == '[') {
-            ++pIn;
-            while (*pIn && ((*pIn == ';') || ((*pIn >= '0' && *pIn <= '9')))) {
-              ++pIn;
-            }
-            if (*pIn == 'm') {
-              ++pIn;
-            }
-          }
-        } else {
-          // copy control chars
-          *pOut = *pIn;
-          ++pOut;
-          ++pIn;
-          if (*pIn == '[') {
-            *pOut = *pIn;
-            ++pOut;
-            ++pIn;
-            while (*pIn && ((*pIn == ';') || ((*pIn >= '0' && *pIn <= '9')))) {
-              *pOut = *pIn;
-              ++pOut;
-              ++pIn;
-            }
-            if (*pIn == 'm') {
-              *pOut = *pIn;
-              ++pOut;
-              ++pIn;
-            }
-          }
-        }
-      } else {
-        ++pIn;
-      }
-    }
-    *pOut = 0;
-    promptChars = len;
-    promptBytes = static_cast<int>(pOut - tempUnicode.get());
-    promptText = tempUnicode;
-
-    promptIndentation = len - promptLastLinePosition;
-    promptCursorRowOffset = promptExtraLines;
-  }
-};
-
-// Used with DynamicPrompt (history search)
-//
-static const Utf32String forwardSearchBasePrompt("(i-search)`");
-static const Utf32String reverseSearchBasePrompt("(reverse-i-search)`");
-static const Utf32String endSearchBasePrompt("': ");
-static Utf32String
-    previousSearchText;  // remembered across invocations of linenoise()
-
-// changing prompt for "(reverse-i-search)`text':" etc.
-//
-struct DynamicPrompt : public PromptBase {
-  Utf32String searchText;  // text we are searching for
-  char* searchCharWidths;  // character widths from mk_wcwidth()
-  int searchTextLen;       // chars in searchText
-  int direction;           // current search direction, 1=forward, -1=reverse
-
-  DynamicPrompt(PromptBase& pi, int initialDirection)
-      : searchTextLen(0), direction(initialDirection) {
-    promptScreenColumns = pi.promptScreenColumns;
-    promptCursorRowOffset = 0;
-    Utf32String emptyString(1);
-    searchText = emptyString;
-    const Utf32String* basePrompt =
-        (direction > 0) ? &forwardSearchBasePrompt : &reverseSearchBasePrompt;
-    size_t promptStartLength = basePrompt->length();
-    promptChars =
-        static_cast<int>(promptStartLength + endSearchBasePrompt.length());
-    promptBytes = promptChars;
-    promptLastLinePosition = promptChars;  // TODO fix this, we are asssuming
-                                           // that the history prompt won't wrap
-                                           // (!)
-    promptPreviousLen = promptChars;
-    Utf32String tempUnicode(promptChars + 1);
-    memcpy(tempUnicode.get(), basePrompt->get(),
-           sizeof(char32_t) * promptStartLength);
-    memcpy(&tempUnicode[promptStartLength], endSearchBasePrompt.get(),
-           sizeof(char32_t) * (endSearchBasePrompt.length() + 1));
-    tempUnicode.initFromBuffer();
-    promptText = tempUnicode;
-    calculateScreenPosition(0, 0, pi.promptScreenColumns, promptChars,
-                            promptIndentation, promptExtraLines);
-  }
-
-  void updateSearchPrompt(void) {
-    const Utf32String* basePrompt =
-        (direction > 0) ? &forwardSearchBasePrompt : &reverseSearchBasePrompt;
-    size_t promptStartLength = basePrompt->length();
-    promptChars = static_cast<int>(promptStartLength + searchTextLen +
-                                   endSearchBasePrompt.length());
-    promptBytes = promptChars;
-    Utf32String tempUnicode(promptChars + 1);
-    memcpy(tempUnicode.get(), basePrompt->get(),
-           sizeof(char32_t) * promptStartLength);
-    memcpy(&tempUnicode[promptStartLength], searchText.get(),
-           sizeof(char32_t) * searchTextLen);
-    size_t endIndex = promptStartLength + searchTextLen;
-    memcpy(&tempUnicode[endIndex], endSearchBasePrompt.get(),
-           sizeof(char32_t) * (endSearchBasePrompt.length() + 1));
-    tempUnicode.initFromBuffer();
-    promptText = tempUnicode;
-  }
-
-  void updateSearchText(const char32_t* textPtr) {
-    Utf32String tempUnicode(textPtr);
-    searchTextLen = static_cast<int>(tempUnicode.chars());
-    searchText = tempUnicode;
-    updateSearchPrompt();
-  }
-};
-
-class KillRing {
-  static const int capacity = 10;
-  int size;
-  int index;
-  char indexToSlot[10];
-  vector<Utf32String> theRing;
-
- public:
-  enum action { actionOther, actionKill, actionYank };
-  action lastAction;
-  size_t lastYankSize;
-
-  KillRing() : size(0), index(0), lastAction(actionOther) {
-    theRing.reserve(capacity);
-  }
-
-  void kill(const char32_t* text, int textLen, bool forward) {
-    if (textLen == 0) {
-      return;
-    }
-    Utf32String killedText(text, textLen);
-    if (lastAction == actionKill && size > 0) {
-      int slot = indexToSlot[0];
-      int currentLen = static_cast<int>(theRing[slot].length());
-      int resultLen = currentLen + textLen;
-      Utf32String temp(resultLen + 1);
-      if (forward) {
-        memcpy(temp.get(), theRing[slot].get(), currentLen * sizeof(char32_t));
-        memcpy(&temp[currentLen], killedText.get(), textLen * sizeof(char32_t));
-      } else {
-        memcpy(temp.get(), killedText.get(), textLen * sizeof(char32_t));
-        memcpy(&temp[textLen], theRing[slot].get(),
-               currentLen * sizeof(char32_t));
-      }
-      temp[resultLen] = 0;
-      temp.initFromBuffer();
-      theRing[slot] = temp;
-    } else {
-      if (size < capacity) {
-        if (size > 0) {
-          memmove(&indexToSlot[1], &indexToSlot[0], size);
-        }
-        indexToSlot[0] = size;
-        size++;
-        theRing.push_back(killedText);
-      } else {
-        int slot = indexToSlot[capacity - 1];
-        theRing[slot] = killedText;
-        memmove(&indexToSlot[1], &indexToSlot[0], capacity - 1);
-        indexToSlot[0] = slot;
-      }
-      index = 0;
-    }
-  }
-
-  Utf32String* yank() { return (size > 0) ? &theRing[indexToSlot[index]] : 0; }
-
-  Utf32String* yankPop() {
-    if (size == 0) {
-      return 0;
-    }
-    ++index;
-    if (index == size) {
-      index = 0;
-    }
-    return &theRing[indexToSlot[index]];
-  }
-};
-
-class InputBuffer {
-  char32_t* buf32;   // input buffer
-  char* charWidths;  // character widths from mk_wcwidth()
-  int buflen;        // buffer size in characters
-  int len;           // length of text in input buffer
-  int pos;           // character position in buffer ( 0 <= pos <= len )
-
-  void clearScreen(PromptBase& pi);
-  int incrementalHistorySearch(PromptBase& pi, int startChar);
-  int completeLine(PromptBase& pi);
-  void refreshLine(PromptBase& pi);
-
- public:
-  InputBuffer(char32_t* buffer, char* widthArray, int bufferLen)
-      : buf32(buffer),
-        charWidths(widthArray),
-        buflen(bufferLen - 1),
-        len(0),
-        pos(0) {
-    buf32[0] = 0;
-  }
-  void preloadBuffer(const char* preloadText) {
-    size_t ucharCount = 0;
-    copyString8to32(buf32, buflen + 1, ucharCount, preloadText);
-    recomputeCharacterWidths(buf32, charWidths, static_cast<int>(ucharCount));
-    len = static_cast<int>(ucharCount);
-    pos = static_cast<int>(ucharCount);
-  }
-  int getInputLine(PromptBase& pi);
-  int length(void) const { return len; }
-};
-
-// Special codes for keyboard input:
-//
-// Between Windows and the various Linux "terminal" programs, there is some
-// pretty diverse behavior in the "scan codes" and escape sequences we are
-// presented with.  So ... we'll translate them all into our own pidgin
-// pseudocode, trying to stay out of the way of UTF-8 and international
-// characters.  Here's the general plan.
-//
-// "User input keystrokes" (key chords, whatever) will be encoded as a single
-// value.
-// The low 21 bits are reserved for Unicode characters.  Popular function-type
-// keys
-// get their own codes in the range 0x10200000 to (if needed) 0x1FE00000,
-// currently
-// just arrow keys, Home, End and Delete.  Keypresses with Ctrl get ORed with
-// 0x20000000, with Alt get ORed with 0x40000000.  So, Ctrl+Alt+Home is encoded
-// as 0x20000000 + 0x40000000 + 0x10A00000 == 0x70A00000.  To keep things
-// complicated,
-// the Alt key is equivalent to prefixing the keystroke with ESC, so ESC
-// followed by
-// D is treated the same as Alt + D ... we'll just use Emacs terminology and
-// call
-// this "Meta".  So, we will encode both ESC followed by D and Alt held down
-// while D
-// is pressed the same, as Meta-D, encoded as 0x40000064.
-//
-// Here are the definitions of our component constants:
-//
-// Maximum unsigned 32-bit value    = 0xFFFFFFFF;   // For reference, max 32-bit
-// value
-// Highest allocated Unicode char   = 0x001FFFFF;   // For reference, max
-// Unicode value
-static const int META = 0x40000000;  // Meta key combination
-static const int CTRL = 0x20000000;  // Ctrl key combination
-// static const int SPECIAL_KEY = 0x10000000;   // Common bit for all special
-// keys
-static const int UP_ARROW_KEY = 0x10200000;  // Special keys
-static const int DOWN_ARROW_KEY = 0x10400000;
-static const int RIGHT_ARROW_KEY = 0x10600000;
-static const int LEFT_ARROW_KEY = 0x10800000;
-static const int HOME_KEY = 0x10A00000;
-static const int END_KEY = 0x10C00000;
-static const int DELETE_KEY = 0x10E00000;
-static const int PAGE_UP_KEY = 0x11000000;
-static const int PAGE_DOWN_KEY = 0x11200000;
-
-static const char* unsupported_term[] = {"dumb", "cons25", "emacs", NULL};
-static linenoiseCompletionCallback* completionCallback = NULL;
-
-#ifdef _WIN32
-static HANDLE console_in, console_out;
-static DWORD oldMode;
-static WORD oldDisplayAttribute;
-#else
-static struct termios orig_termios; /* in order to restore at exit */
-#endif
-
-static KillRing killRing;
-
-static int rawmode = 0; /* for atexit() function to check if restore is needed*/
-static int atexit_registered = 0; /* register atexit just 1 time */
-static int historyMaxLen = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
-static int historyLen = 0;
-static int historyIndex = 0;
-static char8_t** history = NULL;
-
-// used to emulate Windows command prompt on down-arrow after a recall
-// we use -2 as our "not set" value because we add 1 to the previous index on
-// down-arrow,
-// and zero is a valid index (so -1 is a valid "previous index")
-static int historyPreviousIndex = -2;
-static bool historyRecallMostRecent = false;
-
-static void linenoiseAtExit(void);
-
-static bool isUnsupportedTerm(void) {
-  char* term = getenv("TERM");
-  if (term == NULL) return false;
-  for (int j = 0; unsupported_term[j]; ++j)
-    if (!strcasecmp(term, unsupported_term[j])) {
-      return true;
-    }
-  return false;
-}
-
-static void beep() {
-  fprintf(stderr, "\x7");  // ctrl-G == bell/beep
-  fflush(stderr);
-}
-
-void linenoiseHistoryFree(void) {
-  if (history) {
-    for (int j = 0; j < historyLen; ++j) free(history[j]);
-    historyLen = 0;
-    free(history);
-    history = 0;
-  }
-}
-
-static int enableRawMode(void) {
-#ifdef _WIN32
-  if (!console_in) {
-    console_in = GetStdHandle(STD_INPUT_HANDLE);
-    console_out = GetStdHandle(STD_OUTPUT_HANDLE);
-
-    GetConsoleMode(console_in, &oldMode);
-    SetConsoleMode(console_in, oldMode &
-                                   ~(ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT |
-                                     ENABLE_PROCESSED_INPUT));
-  }
-  return 0;
-#else
-  struct termios raw;
-
-  if (!isatty(STDIN_FILENO)) goto fatal;
-  if (!atexit_registered) {
-    atexit(linenoiseAtExit);
-    atexit_registered = 1;
-  }
-  if (tcgetattr(0, &orig_termios) == -1) goto fatal;
-
-  raw = orig_termios; /* modify the original mode */
-  /* input modes: no break, no CR to NL, no parity check, no strip char,
-   * no start/stop output control. */
-  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
-  /* output modes - disable post processing */
-  // this is wrong, we don't want raw output, it turns newlines into straight
-  // linefeeds
-  // raw.c_oflag &= ~(OPOST);
-  /* control modes - set 8 bit chars */
-  raw.c_cflag |= (CS8);
-  /* local modes - echoing off, canonical off, no extended functions,
-   * no signal chars (^Z,^C) */
-  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
-  /* control chars - set return condition: min number of bytes and timer.
-   * We want read to return every single byte, without timeout. */
-  raw.c_cc[VMIN] = 1;
-  raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
-
-  /* put terminal in raw mode after flushing */
-  if (tcsetattr(0, TCSADRAIN, &raw) < 0) goto fatal;
-  rawmode = 1;
-  return 0;
-
-fatal:
-  errno = ENOTTY;
-  return -1;
-#endif
-}
-
-static void disableRawMode(void) {
-#ifdef _WIN32
-  SetConsoleMode(console_in, oldMode);
-  console_in = 0;
-  console_out = 0;
-#else
-  if (rawmode && tcsetattr(0, TCSADRAIN, &orig_termios) != -1) rawmode = 0;
-#endif
-}
-
-// At exit we'll try to fix the terminal to the initial conditions
-static void linenoiseAtExit(void) { disableRawMode(); }
-
-static int getScreenColumns(void) {
-  int cols;
-#ifdef _WIN32
-  CONSOLE_SCREEN_BUFFER_INFO inf;
-  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &inf);
-  cols = inf.dwSize.X;
-#else
-  struct winsize ws;
-  cols = (ioctl(1, TIOCGWINSZ, &ws) == -1) ? 80 : ws.ws_col;
-#endif
-  // cols is 0 in certain circumstances like inside debugger, which creates
-  // further issues
-  return (cols > 0) ? cols : 80;
-}
-
-static int getScreenRows(void) {
-  int rows;
-#ifdef _WIN32
-  CONSOLE_SCREEN_BUFFER_INFO inf;
-  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &inf);
-  rows = 1 + inf.srWindow.Bottom - inf.srWindow.Top;
-#else
-  struct winsize ws;
-  rows = (ioctl(1, TIOCGWINSZ, &ws) == -1) ? 24 : ws.ws_row;
-#endif
-  return (rows > 0) ? rows : 24;
-}
-
-static void setDisplayAttribute(bool enhancedDisplay, bool error) {
-#ifdef _WIN32
-  if (enhancedDisplay) {
-    CONSOLE_SCREEN_BUFFER_INFO inf;
-    GetConsoleScreenBufferInfo(console_out, &inf);
-    oldDisplayAttribute = inf.wAttributes;
-    BYTE oldLowByte = oldDisplayAttribute & 0xFF;
-    BYTE newLowByte;
-    switch (oldLowByte) {
-      case 0x07:
-        // newLowByte = FOREGROUND_BLUE | FOREGROUND_INTENSITY;  // too dim
-        // newLowByte = FOREGROUND_BLUE;                         // even dimmer
-        newLowByte = FOREGROUND_BLUE |
-                     FOREGROUND_GREEN;  // most similar to xterm appearance
-        break;
-      case 0x70:
-        newLowByte = BACKGROUND_BLUE | BACKGROUND_INTENSITY;
-        break;
-      default:
-        newLowByte = oldLowByte ^ 0xFF;  // default to inverse video
-        break;
-    }
-    inf.wAttributes = (inf.wAttributes & 0xFF00) | newLowByte;
-    SetConsoleTextAttribute(console_out, inf.wAttributes);
-  } else {
-    SetConsoleTextAttribute(console_out, oldDisplayAttribute);
-  }
-#else
-  if (enhancedDisplay) {
-    char const* p = (error ? "\x1b[1;31m" : "\x1b[1;34m");
-    if (write(1, p, 7) == -1)
-      return; /* bright blue (visible with both B&W bg) */
-  } else {
-    if (write(1, "\x1b[0m", 4) == -1) return; /* reset */
-  }
-#endif
-}
-
-/**
- * Display the dynamic incremental search prompt and the current user input
- * line.
- * @param pi   PromptBase struct holding information about the prompt and our
- * screen position
- * @param buf32  input buffer to be displayed
- * @param len  count of characters in the buffer
- * @param pos  current cursor position within the buffer (0 <= pos <= len)
- */
-static void dynamicRefresh(PromptBase& pi, char32_t* buf32, int len, int pos) {
-  // calculate the position of the end of the prompt
-  int xEndOfPrompt, yEndOfPrompt;
-  calculateScreenPosition(0, 0, pi.promptScreenColumns, pi.promptChars,
-                          xEndOfPrompt, yEndOfPrompt);
-  pi.promptIndentation = xEndOfPrompt;
-
-  // calculate the position of the end of the input line
-  int xEndOfInput, yEndOfInput;
-  calculateScreenPosition(xEndOfPrompt, yEndOfPrompt, pi.promptScreenColumns,
-                          calculateColumnPosition(buf32, len), xEndOfInput,
-                          yEndOfInput);
-
-  // calculate the desired position of the cursor
-  int xCursorPos, yCursorPos;
-  calculateScreenPosition(xEndOfPrompt, yEndOfPrompt, pi.promptScreenColumns,
-                          calculateColumnPosition(buf32, pos), xCursorPos,
-                          yCursorPos);
-
-#ifdef _WIN32
-  // position at the start of the prompt, clear to end of previous input
-  CONSOLE_SCREEN_BUFFER_INFO inf;
-  GetConsoleScreenBufferInfo(console_out, &inf);
-  inf.dwCursorPosition.X = 0;
-  inf.dwCursorPosition.Y -= pi.promptCursorRowOffset /*- pi.promptExtraLines*/;
-  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
-  DWORD count;
-  FillConsoleOutputCharacterA(console_out, ' ',
-                              pi.promptPreviousLen + pi.promptPreviousInputLen,
-                              inf.dwCursorPosition, &count);
-  pi.promptPreviousLen = pi.promptIndentation;
-  pi.promptPreviousInputLen = len;
-
-  // display the prompt
-  if (!pi.write()) return;
-
-  // display the input line
-  if (write32(1, buf32, len) == -1) return;
-
-  // position the cursor
-  GetConsoleScreenBufferInfo(console_out, &inf);
-  inf.dwCursorPosition.X = xCursorPos;  // 0-based on Win32
-  inf.dwCursorPosition.Y -= yEndOfInput - yCursorPos;
-  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
-#else  // _WIN32
-  char seq[64];
-  int cursorRowMovement = pi.promptCursorRowOffset - pi.promptExtraLines;
-  if (cursorRowMovement > 0) {  // move the cursor up as required
-    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
-    if (write(1, seq, strlen(seq)) == -1) return;
-  }
-  // position at the start of the prompt, clear to end of screen
-  snprintf(seq, sizeof seq, "\x1b[1G\x1b[J");  // 1-based on VT100
-  if (write(1, seq, strlen(seq)) == -1) return;
-
-  // display the prompt
-  if (!pi.write()) return;
-
-  // display the input line
-  if (write32(1, buf32, len) == -1) return;
-
-  // we have to generate our own newline on line wrap
-  if (xEndOfInput == 0 && yEndOfInput > 0)
-    if (write(1, "\n", 1) == -1) return;
-
-  // position the cursor
-  cursorRowMovement = yEndOfInput - yCursorPos;
-  if (cursorRowMovement > 0) {  // move the cursor up as required
-    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
-    if (write(1, seq, strlen(seq)) == -1) return;
-  }
-  // position the cursor within the line
-  snprintf(seq, sizeof seq, "\x1b[%dG", xCursorPos + 1);  // 1-based on VT100
-  if (write(1, seq, strlen(seq)) == -1) return;
-#endif
-
-  pi.promptCursorRowOffset =
-      pi.promptExtraLines + yCursorPos;  // remember row for next pass
-}
-
-/**
- * Refresh the user's input line: the prompt is already onscreen and is not
- * redrawn here
- * @param pi   PromptBase struct holding information about the prompt and our
- * screen position
- */
-void InputBuffer::refreshLine(PromptBase& pi) {
-  // check for a matching brace/bracket/paren, remember its position if found
-  int highlight = -1;
-  bool indicateError = false;
-  if (pos < len) {
-    /* this scans for a brace matching buf32[pos] to highlight */
-    unsigned char part1, part2;
-    int scanDirection = 0;
-    if (strchr("}])", buf32[pos])) {
-      scanDirection = -1; /* backwards */
-      if (buf32[pos] == '}') {
-        part1 = '}'; part2 = '{';
-      } else if (buf32[pos] == ']') {
-        part1 = ']'; part2 = '[';
-      } else {
-        part1 = ')'; part2 = '(';
-      }
-    }
-    else if (strchr("{[(", buf32[pos])) {
-      scanDirection = 1; /* forwards */
-      if (buf32[pos] == '{') {
-        //part1 = '{'; part2 = '}';
-        part1 = '}'; part2 = '{';
-      } else if (buf32[pos] == '[') {
-        //part1 = '['; part2 = ']';
-        part1 = ']'; part2 = '[';
-      } else {
-        //part1 = '('; part2 = ')';
-        part1 = ')'; part2 = '(';
-      }
-    }
-
-    if (scanDirection) {
-      int unmatched = scanDirection;
-      int unmatchedOther = 0;
-      for (int i = pos + scanDirection; i >= 0 && i < len; i += scanDirection) {
-        /* TODO: the right thing when inside a string */
-        if (strchr("}])", buf32[i])) {
-          if (buf32[i] == part1) {
-            --unmatched;
-          } else {
-            --unmatchedOther;
-          }
-        } else if (strchr("{[(", buf32[i])) {
-          if (buf32[i] == part2) {
-            ++unmatched;
-          } else {
-            ++unmatchedOther;
-          }
-        }
-/*
-        if (strchr("}])", buf32[i]))
-          --unmatched;
-        else if (strchr("{[(", buf32[i]))
-          ++unmatched;
-*/
-        if (unmatched == 0) {
-          highlight = i;
-          indicateError = (unmatchedOther != 0);
-          break;
-        }
-      }
-    }
-  }
-
-  // calculate the position of the end of the input line
-  int xEndOfInput, yEndOfInput;
-  calculateScreenPosition(pi.promptIndentation, 0, pi.promptScreenColumns,
-                          calculateColumnPosition(buf32, len), xEndOfInput,
-                          yEndOfInput);
-
-  // calculate the desired position of the cursor
-  int xCursorPos, yCursorPos;
-  calculateScreenPosition(pi.promptIndentation, 0, pi.promptScreenColumns,
-                          calculateColumnPosition(buf32, pos), xCursorPos,
-                          yCursorPos);
-
-#ifdef _WIN32
-  // position at the end of the prompt, clear to end of previous input
-  CONSOLE_SCREEN_BUFFER_INFO inf;
-  GetConsoleScreenBufferInfo(console_out, &inf);
-  inf.dwCursorPosition.X = pi.promptIndentation;  // 0-based on Win32
-  inf.dwCursorPosition.Y -= pi.promptCursorRowOffset - pi.promptExtraLines;
-  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
-  DWORD count;
-  if (len < pi.promptPreviousInputLen)
-    FillConsoleOutputCharacterA(console_out, ' ', pi.promptPreviousInputLen,
-                                inf.dwCursorPosition, &count);
-  pi.promptPreviousInputLen = len;
-
-  // display the input line
-  if (highlight == -1) {
-    if (write32(1, buf32, len) == -1) return;
-  } else {
-    if (write32(1, buf32, highlight) == -1) return;
-    setDisplayAttribute(true, indicateError); /* bright blue (visible with both B&W bg) */
-    if (write32(1, &buf32[highlight], 1) == -1) return;
-    setDisplayAttribute(false, indicateError);
-    if (write32(1, buf32 + highlight + 1, len - highlight - 1) == -1) return;
-  }
-
-  // position the cursor
-  GetConsoleScreenBufferInfo(console_out, &inf);
-  inf.dwCursorPosition.X = xCursorPos;  // 0-based on Win32
-  inf.dwCursorPosition.Y -= yEndOfInput - yCursorPos;
-  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
-#else  // _WIN32
-  char seq[64];
-  int cursorRowMovement = pi.promptCursorRowOffset - pi.promptExtraLines;
-  if (cursorRowMovement > 0) {  // move the cursor up as required
-    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
-    if (write(1, seq, strlen(seq)) == -1) return;
-  }
-  // position at the end of the prompt, clear to end of screen
-  snprintf(seq, sizeof seq, "\x1b[%dG\x1b[J",
-           pi.promptIndentation + 1);  // 1-based on VT100
-  if (write(1, seq, strlen(seq)) == -1) return;
-
-  if (highlight == -1) {  // write unhighlighted text
-    if (write32(1, buf32, len) == -1) return;
-  } else {  // highlight the matching brace/bracket/parenthesis
-    if (write32(1, buf32, highlight) == -1) return;
-    setDisplayAttribute(true, indicateError);
-    if (write32(1, &buf32[highlight], 1) == -1) return;
-    setDisplayAttribute(false, indicateError);
-    if (write32(1, buf32 + highlight + 1, len - highlight - 1) == -1) return;
-  }
-
-  // we have to generate our own newline on line wrap
-  if (xEndOfInput == 0 && yEndOfInput > 0)
-    if (write(1, "\n", 1) == -1) return;
-
-  // position the cursor
-  cursorRowMovement = yEndOfInput - yCursorPos;
-  if (cursorRowMovement > 0) {  // move the cursor up as required
-    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
-    if (write(1, seq, strlen(seq)) == -1) return;
-  }
-  // position the cursor within the line
-  snprintf(seq, sizeof seq, "\x1b[%dG", xCursorPos + 1);  // 1-based on VT100
-  if (write(1, seq, strlen(seq)) == -1) return;
-#endif
-
-  pi.promptCursorRowOffset =
-      pi.promptExtraLines + yCursorPos;  // remember row for next pass
-}
-
-#ifndef _WIN32
-
-/**
- * Read a UTF-8 sequence from the non-Windows keyboard and return the Unicode
- * (char32_t) character it
- * encodes
- *
- * @return  char32_t Unicode character
- */
-static char32_t readUnicodeCharacter(void) {
-  static char8_t utf8String[5];
-  static size_t utf8Count = 0;
-  while (true) {
-    char8_t c;
-
-    /* Continue reading if interrupted by signal. */
-    ssize_t nread;
-    do {
-      nread = read(0, &c, 1);
-    } while ((nread == -1) && (errno == EINTR));
-
-    if (nread <= 0) return 0;
-    if (c <= 0x7F) {  // short circuit ASCII
-      utf8Count = 0;
-      return c;
-    } else if (utf8Count < sizeof(utf8String) - 1) {
-      utf8String[utf8Count++] = c;
-      utf8String[utf8Count] = 0;
-      char32_t unicodeChar[2];
-      size_t ucharCount;
-      ConversionResult res =
-          copyString8to32(unicodeChar, 2, ucharCount, utf8String);
-      if (res == conversionOK && ucharCount) {
-        utf8Count = 0;
-        return unicodeChar[0];
-      }
-    } else {
-      utf8Count =
-          0;  // this shouldn't happen: got four bytes but no UTF-8 character
-    }
-  }
-}
-
-namespace EscapeSequenceProcessing {  // move these out of global namespace
-
-// This chunk of code does parsing of the escape sequences sent by various Linux
-// terminals.
-//
-// It handles arrow keys, Home, End and Delete keys by interpreting the
-// sequences sent by
-// gnome terminal, xterm, rxvt, konsole, aterm and yakuake including the Alt and
-// Ctrl key
-// combinations that are understood by linenoise.
-//
-// The parsing uses tables, a bunch of intermediate dispatch routines and a
-// doDispatch
-// loop that reads the tables and sends control to "deeper" routines to continue
-// the
-// parsing.  The starting call to doDispatch( c, initialDispatch ) will
-// eventually return
-// either a character (with optional CTRL and META bits set), or -1 if parsing
-// fails, or
-// zero if an attempt to read from the keyboard fails.
-//
-// This is rather sloppy escape sequence processing, since we're not paying
-// attention to what the
-// actual TERM is set to and are processing all key sequences for all terminals,
-// but it works with
-// the most common keystrokes on the most common terminals.  It's intricate, but
-// the nested 'if'
-// statements required to do it directly would be worse.  This way has the
-// advantage of allowing
-// changes and extensions without having to touch a lot of code.
-
-// This is a typedef for the routine called by doDispatch().  It takes the
-// current character
-// as input, does any required processing including reading more characters and
-// calling other
-// dispatch routines, then eventually returns the final (possibly extended or
-// special) character.
-//
-typedef char32_t (*CharacterDispatchRoutine)(char32_t);
-
-// This structure is used by doDispatch() to hold a list of characters to test
-// for and
-// a list of routines to call if the character matches.  The dispatch routine
-// list is one
-// longer than the character list; the final entry is used if no character
-// matches.
-//
-struct CharacterDispatch {
-  unsigned int len;                    // length of the chars list
-  const char* chars;                   // chars to test
-  CharacterDispatchRoutine* dispatch;  // array of routines to call
-};
-
-// This dispatch routine is given a dispatch table and then farms work out to
-// routines
-// listed in the table based on the character it is called with.  The dispatch
-// routines can
-// read more input characters to decide what should eventually be returned.
-// Eventually,
-// a called routine returns either a character or -1 to indicate parsing
-// failure.
-//
-static char32_t doDispatch(char32_t c, CharacterDispatch& dispatchTable) {
-  for (unsigned int i = 0; i < dispatchTable.len; ++i) {
-    if (static_cast<unsigned char>(dispatchTable.chars[i]) == c) {
-      return dispatchTable.dispatch[i](c);
-    }
-  }
-  return dispatchTable.dispatch[dispatchTable.len](c);
-}
-
-static char32_t thisKeyMetaCtrl =
-    0;  // holds pre-set Meta and/or Ctrl modifiers
-
-// Final dispatch routines -- return something
-//
-static char32_t normalKeyRoutine(char32_t c) { return thisKeyMetaCtrl | c; }
-static char32_t upArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | UP_ARROW_KEY;
-}
-static char32_t downArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | DOWN_ARROW_KEY;
-}
-static char32_t rightArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | RIGHT_ARROW_KEY;
-}
-static char32_t leftArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | LEFT_ARROW_KEY;
-}
-static char32_t homeKeyRoutine(char32_t) { return thisKeyMetaCtrl | HOME_KEY; }
-static char32_t endKeyRoutine(char32_t) { return thisKeyMetaCtrl | END_KEY; }
-static char32_t pageUpKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | PAGE_UP_KEY;
-}
-static char32_t pageDownKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | PAGE_DOWN_KEY;
-}
-static char32_t deleteCharRoutine(char32_t) {
-  return thisKeyMetaCtrl | ctrlChar('H');
-}  // key labeled Backspace
-static char32_t deleteKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | DELETE_KEY;
-}  // key labeled Delete
-static char32_t ctrlUpArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | CTRL | UP_ARROW_KEY;
-}
-static char32_t ctrlDownArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | CTRL | DOWN_ARROW_KEY;
-}
-static char32_t ctrlRightArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | CTRL | RIGHT_ARROW_KEY;
-}
-static char32_t ctrlLeftArrowKeyRoutine(char32_t) {
-  return thisKeyMetaCtrl | CTRL | LEFT_ARROW_KEY;
-}
-static char32_t escFailureRoutine(char32_t) {
-  beep();
-  return -1;
-}
-
-// Handle ESC [ 1 ; 3 (or 5) <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket1Semicolon3or5Routines[] = {
-    upArrowKeyRoutine, downArrowKeyRoutine, rightArrowKeyRoutine,
-    leftArrowKeyRoutine, escFailureRoutine};
-static CharacterDispatch escLeftBracket1Semicolon3or5Dispatch = {
-    4, "ABCD", escLeftBracket1Semicolon3or5Routines};
-
-// Handle ESC [ 1 ; <more stuff> escape sequences
-//
-static char32_t escLeftBracket1Semicolon3Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  thisKeyMetaCtrl |= META;
-  return doDispatch(c, escLeftBracket1Semicolon3or5Dispatch);
-}
-static char32_t escLeftBracket1Semicolon5Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  thisKeyMetaCtrl |= CTRL;
-  return doDispatch(c, escLeftBracket1Semicolon3or5Dispatch);
-}
-static CharacterDispatchRoutine escLeftBracket1SemicolonRoutines[] = {
-    escLeftBracket1Semicolon3Routine, escLeftBracket1Semicolon5Routine,
-    escFailureRoutine};
-static CharacterDispatch escLeftBracket1SemicolonDispatch = {
-    2, "35", escLeftBracket1SemicolonRoutines};
-
-// Handle ESC [ 1 <more stuff> escape sequences
-//
-static char32_t escLeftBracket1SemicolonRoutine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket1SemicolonDispatch);
-}
-static CharacterDispatchRoutine escLeftBracket1Routines[] = {
-    homeKeyRoutine, escLeftBracket1SemicolonRoutine, escFailureRoutine};
-static CharacterDispatch escLeftBracket1Dispatch = {2, "~;",
-                                                    escLeftBracket1Routines};
-
-// Handle ESC [ 3 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket3Routines[] = {deleteKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket3Dispatch = {1, "~",
-                                                    escLeftBracket3Routines};
-
-// Handle ESC [ 4 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket4Routines[] = {endKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket4Dispatch = {1, "~",
-                                                    escLeftBracket4Routines};
-
-// Handle ESC [ 5 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket5Routines[] = {pageUpKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket5Dispatch = {1, "~",
-                                                    escLeftBracket5Routines};
-
-// Handle ESC [ 6 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket6Routines[] = {pageDownKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket6Dispatch = {1, "~",
-                                                    escLeftBracket6Routines};
-
-// Handle ESC [ 7 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket7Routines[] = {homeKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket7Dispatch = {1, "~",
-                                                    escLeftBracket7Routines};
-
-// Handle ESC [ 8 <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracket8Routines[] = {endKeyRoutine,
-                                                             escFailureRoutine};
-static CharacterDispatch escLeftBracket8Dispatch = {1, "~",
-                                                    escLeftBracket8Routines};
-
-// Handle ESC [ <digit> escape sequences
-//
-static char32_t escLeftBracket0Routine(char32_t c) {
-  return escFailureRoutine(c);
-}
-static char32_t escLeftBracket1Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket1Dispatch);
-}
-static char32_t escLeftBracket2Routine(char32_t c) {
-  return escFailureRoutine(c);  // Insert key, unused
-}
-static char32_t escLeftBracket3Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket3Dispatch);
-}
-static char32_t escLeftBracket4Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket4Dispatch);
-}
-static char32_t escLeftBracket5Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket5Dispatch);
-}
-static char32_t escLeftBracket6Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket6Dispatch);
-}
-static char32_t escLeftBracket7Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket7Dispatch);
-}
-static char32_t escLeftBracket8Routine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracket8Dispatch);
-}
-static char32_t escLeftBracket9Routine(char32_t c) {
-  return escFailureRoutine(c);
-}
-
-// Handle ESC [ <more stuff> escape sequences
-//
-static CharacterDispatchRoutine escLeftBracketRoutines[] = {
-    upArrowKeyRoutine,      downArrowKeyRoutine,    rightArrowKeyRoutine,
-    leftArrowKeyRoutine,    homeKeyRoutine,         endKeyRoutine,
-    escLeftBracket0Routine, escLeftBracket1Routine, escLeftBracket2Routine,
-    escLeftBracket3Routine, escLeftBracket4Routine, escLeftBracket5Routine,
-    escLeftBracket6Routine, escLeftBracket7Routine, escLeftBracket8Routine,
-    escLeftBracket9Routine, escFailureRoutine};
-static CharacterDispatch escLeftBracketDispatch = {16, "ABCDHF0123456789",
-                                                   escLeftBracketRoutines};
-
-// Handle ESC O <char> escape sequences
-//
-static CharacterDispatchRoutine escORoutines[] = {
-    upArrowKeyRoutine,       downArrowKeyRoutine,     rightArrowKeyRoutine,
-    leftArrowKeyRoutine,     homeKeyRoutine,          endKeyRoutine,
-    ctrlUpArrowKeyRoutine,   ctrlDownArrowKeyRoutine, ctrlRightArrowKeyRoutine,
-    ctrlLeftArrowKeyRoutine, escFailureRoutine};
-static CharacterDispatch escODispatch = {10, "ABCDHFabcd", escORoutines};
-
-// Initial ESC dispatch -- could be a Meta prefix or the start of an escape
-// sequence
-//
-static char32_t escLeftBracketRoutine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escLeftBracketDispatch);
-}
-static char32_t escORoutine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escODispatch);
-}
-static char32_t setMetaRoutine(char32_t c);  // need forward reference
-static CharacterDispatchRoutine escRoutines[] = {escLeftBracketRoutine,
-                                                 escORoutine, setMetaRoutine};
-static CharacterDispatch escDispatch = {2, "[O", escRoutines};
-
-// Initial dispatch -- we are not in the middle of anything yet
-//
-static char32_t escRoutine(char32_t c) {
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-  return doDispatch(c, escDispatch);
-}
-static CharacterDispatchRoutine initialRoutines[] = {
-    escRoutine, deleteCharRoutine, normalKeyRoutine};
-static CharacterDispatch initialDispatch = {2, "\x1B\x7F", initialRoutines};
-
-// Special handling for the ESC key because it does double duty
-//
-static char32_t setMetaRoutine(char32_t c) {
-  thisKeyMetaCtrl = META;
-  if (c == 0x1B) {  // another ESC, stay in ESC processing mode
-    c = readUnicodeCharacter();
-    if (c == 0) return 0;
-    return doDispatch(c, escDispatch);
-  }
-  return doDispatch(c, initialDispatch);
-}
-
-}  // namespace EscapeSequenceProcessing // move these out of global namespace
-
-#endif  // #ifndef _WIN32
-
-// linenoiseReadChar -- read a keystroke or keychord from the keyboard, and
-// translate it
-// into an encoded "keystroke".  When convenient, extended keys are translated
-// into their
-// simpler Emacs keystrokes, so an unmodified "left arrow" becomes Ctrl-B.
-//
-// A return value of zero means "no input available", and a return value of -1
-// means "invalid key".
-//
-static char32_t linenoiseReadChar(void) {
-#ifdef _WIN32
-
-  INPUT_RECORD rec;
-  DWORD count;
-  int modifierKeys = 0;
-  bool escSeen = false;
-  while (true) {
-    ReadConsoleInputW(console_in, &rec, 1, &count);
-#if 0  // helper for debugging keystrokes, display info in the debug "Output"
-       // window in the debugger
-        {
-            if ( rec.EventType == KEY_EVENT ) {
-                //if ( rec.Event.KeyEvent.uChar.UnicodeChar ) {
-                    char buf[1024];
-                    sprintf(
-                            buf,
-                            "Unicode character 0x%04X, repeat count %d, virtual keycode 0x%04X, "
-                            "virtual scancode 0x%04X, key %s%s%s%s%s\n",
-                            rec.Event.KeyEvent.uChar.UnicodeChar,
-                            rec.Event.KeyEvent.wRepeatCount,
-                            rec.Event.KeyEvent.wVirtualKeyCode,
-                            rec.Event.KeyEvent.wVirtualScanCode,
-                            rec.Event.KeyEvent.bKeyDown ? "down" : "up",
-                                (rec.Event.KeyEvent.dwControlKeyState & LEFT_CTRL_PRESSED)  ?
-                                    " L-Ctrl" : "",
-                                (rec.Event.KeyEvent.dwControlKeyState & RIGHT_CTRL_PRESSED) ?
-                                    " R-Ctrl" : "",
-                                (rec.Event.KeyEvent.dwControlKeyState & LEFT_ALT_PRESSED)   ?
-                                    " L-Alt"  : "",
-                                (rec.Event.KeyEvent.dwControlKeyState & RIGHT_ALT_PRESSED)  ?
-                                    " R-Alt"  : ""
-                           );
-                    OutputDebugStringA( buf );
-                //}
-            }
-        }
-#endif
-    if (rec.EventType != KEY_EVENT) {
-      continue;
-    }
-    // Windows provides for entry of characters that are not on your keyboard by
-    // sending the
-    // Unicode characters as a "key up" with virtual keycode 0x12 (VK_MENU ==
-    // Alt key) ...
-    // accept these characters, otherwise only process characters on "key down"
-    if (!rec.Event.KeyEvent.bKeyDown &&
-        rec.Event.KeyEvent.wVirtualKeyCode != VK_MENU) {
-      continue;
-    }
-    modifierKeys = 0;
-    // AltGr is encoded as ( LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED ), so don't
-    // treat this
-    // combination as either CTRL or META we just turn off those two bits, so it
-    // is still
-    // possible to combine CTRL and/or META with an AltGr key by using
-    // right-Ctrl and/or
-    // left-Alt
-    if ((rec.Event.KeyEvent.dwControlKeyState &
-         (LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED)) ==
-        (LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED)) {
-      rec.Event.KeyEvent.dwControlKeyState &=
-          ~(LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED);
-    }
-    if (rec.Event.KeyEvent.dwControlKeyState &
-        (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED)) {
-      modifierKeys |= CTRL;
-    }
-    if (rec.Event.KeyEvent.dwControlKeyState &
-        (RIGHT_ALT_PRESSED | LEFT_ALT_PRESSED)) {
-      modifierKeys |= META;
-    }
-    if (escSeen) {
-      modifierKeys |= META;
-    }
-    if (rec.Event.KeyEvent.uChar.UnicodeChar == 0) {
-      switch (rec.Event.KeyEvent.wVirtualKeyCode) {
-        case VK_LEFT:
-          return modifierKeys | LEFT_ARROW_KEY;
-        case VK_RIGHT:
-          return modifierKeys | RIGHT_ARROW_KEY;
-        case VK_UP:
-          return modifierKeys | UP_ARROW_KEY;
-        case VK_DOWN:
-          return modifierKeys | DOWN_ARROW_KEY;
-        case VK_DELETE:
-          return modifierKeys | DELETE_KEY;
-        case VK_HOME:
-          return modifierKeys | HOME_KEY;
-        case VK_END:
-          return modifierKeys | END_KEY;
-        case VK_PRIOR:
-          return modifierKeys | PAGE_UP_KEY;
-        case VK_NEXT:
-          return modifierKeys | PAGE_DOWN_KEY;
-        default:
-          continue;  // in raw mode, ReadConsoleInput shows shift, ctrl ...
-      }              //  ... ignore them
-    } else if (rec.Event.KeyEvent.uChar.UnicodeChar ==
-               ctrlChar('[')) {  // ESC, set flag for later
-      escSeen = true;
-      continue;
-    } else {
-      // we got a real character, return it
-      return modifierKeys | rec.Event.KeyEvent.uChar.UnicodeChar;
-    }
-  }
-
-#else
-  char32_t c;
-  c = readUnicodeCharacter();
-  if (c == 0) return 0;
-
-// If _DEBUG_LINUX_KEYBOARD is set, then ctrl-^ puts us into a keyboard
-// debugging mode
-// where we print out decimal and decoded values for whatever the "terminal"
-// program
-// gives us on different keystrokes.  Hit ctrl-C to exit this mode.
-//
-#define _DEBUG_LINUX_KEYBOARD
-#if defined(_DEBUG_LINUX_KEYBOARD)
-  if (c == ctrlChar('^')) {  // ctrl-^, special debug mode, prints all keys hit,
-                             // ctrl-C to get out
-    printf(
-        "\nEntering keyboard debugging mode (on ctrl-^), press ctrl-C to exit "
-        "this mode\n");
-    while (true) {
-      unsigned char keys[10];
-      int ret = read(0, keys, 10);
-
-      if (ret <= 0) {
-        printf("\nret: %d\n", ret);
-      }
-      for (int i = 0; i < ret; ++i) {
-        char32_t key = static_cast<char32_t>(keys[i]);
-        char* friendlyTextPtr;
-        char friendlyTextBuf[10];
-        const char* prefixText = (key < 0x80) ? "" : "0x80+";
-        char32_t keyCopy = (key < 0x80) ? key : key - 0x80;
-        if (keyCopy >= '!' && keyCopy <= '~') {  // printable
-          friendlyTextBuf[0] = '\'';
-          friendlyTextBuf[1] = keyCopy;
-          friendlyTextBuf[2] = '\'';
-          friendlyTextBuf[3] = 0;
-          friendlyTextPtr = friendlyTextBuf;
-        } else if (keyCopy == ' ') {
-          friendlyTextPtr = const_cast<char*>("space");
-        } else if (keyCopy == 27) {
-          friendlyTextPtr = const_cast<char*>("ESC");
-        } else if (keyCopy == 0) {
-          friendlyTextPtr = const_cast<char*>("NUL");
-        } else if (keyCopy == 127) {
-          friendlyTextPtr = const_cast<char*>("DEL");
-        } else {
-          friendlyTextBuf[0] = '^';
-          friendlyTextBuf[1] = keyCopy + 0x40;
-          friendlyTextBuf[2] = 0;
-          friendlyTextPtr = friendlyTextBuf;
-        }
-        printf("%d x%02X (%s%s)  ", key, key, prefixText, friendlyTextPtr);
-      }
-      printf("\x1b[1G\n");  // go to first column of new line
-
-      // drop out of this loop on ctrl-C
-      if (keys[0] == ctrlChar('C')) {
-        printf("Leaving keyboard debugging mode (on ctrl-C)\n");
-        fflush(stdout);
-        return -2;
-      }
-    }
-  }
-#endif  // _DEBUG_LINUX_KEYBOARD
-
-  EscapeSequenceProcessing::thisKeyMetaCtrl =
-      0;  // no modifiers yet at initialDispatch
-  return EscapeSequenceProcessing::doDispatch(
-      c, EscapeSequenceProcessing::initialDispatch);
-#endif  // #_WIN32
-}
-
-/**
- * Free memory used in a recent command completion session
- *
- * @param lc pointer to a linenoiseCompletions struct
- */
-static void freeCompletions(linenoiseCompletions* lc) {
-  lc->completionStrings.clear();
-}
-
-/**
- * convert {CTRL + 'A'}, {CTRL + 'a'} and {CTRL + ctrlChar( 'A' )} into
- * ctrlChar( 'A' )
- * leave META alone
- *
- * @param c character to clean up
- * @return cleaned-up character
- */
-static int cleanupCtrl(int c) {
-  if (c & CTRL) {
-    int d = c & 0x1FF;
-    if (d >= 'a' && d <= 'z') {
-      c = (c + ('a' - ctrlChar('A'))) & ~CTRL;
-    }
-    if (d >= 'A' && d <= 'Z') {
-      c = (c + ('A' - ctrlChar('A'))) & ~CTRL;
-    }
-    if (d >= ctrlChar('A') && d <= ctrlChar('Z')) {
-      c = c & ~CTRL;
-    }
-  }
-  return c;
-}
-
-// break characters that may precede items to be completed
-static const char breakChars[] = " =+-/\\*?\"'`&<>;|@{([])}";
-
-// maximum number of completions to display without asking
-static const size_t completionCountCutoff = 100;
-
-/**
- * Handle command completion, using a completionCallback() routine to provide
- * possible substitutions
- * This routine handles the mechanics of updating the user's input buffer with
- * possible replacement
- * of text as the user selects a proposed completion string, or cancels the
- * completion attempt.
- * @param pi     PromptBase struct holding information about the prompt and our
- * screen position
- */
-int InputBuffer::completeLine(PromptBase& pi) {
-  linenoiseCompletions lc;
-  char32_t c = 0;
-
-  // completionCallback() expects a parsable entity, so find the previous break
-  // character and
-  // extract a copy to parse.  we also handle the case where tab is hit while
-  // not at end-of-line.
-  int startIndex = pos;
-  while (--startIndex >= 0) {
-    if (strchr(breakChars, buf32[startIndex])) {
-      break;
-    }
-  }
-  ++startIndex;
-  int itemLength = pos - startIndex;
-  Utf32String unicodeCopy(&buf32[startIndex], itemLength);
-  Utf8String parseItem(unicodeCopy);
-
-  // get a list of completions
-  completionCallback(parseItem.get(), &lc);
-
-  // if no completions, we are done
-  if (lc.completionStrings.size() == 0) {
-    beep();
-    freeCompletions(&lc);
-    return 0;
-  }
-
-  // at least one completion
-  int longestCommonPrefix = 0;
-  int displayLength = 0;
-  if (lc.completionStrings.size() == 1) {
-    longestCommonPrefix = static_cast<int>(lc.completionStrings[0].length());
-  } else {
-    bool keepGoing = true;
-    while (keepGoing) {
-      for (size_t j = 0; j < lc.completionStrings.size() - 1; ++j) {
-        char32_t c1 = lc.completionStrings[j][longestCommonPrefix];
-        char32_t c2 = lc.completionStrings[j + 1][longestCommonPrefix];
-        if ((0 == c1) || (0 == c2) || (c1 != c2)) {
-          keepGoing = false;
-          break;
-        }
-      }
-      if (keepGoing) {
-        ++longestCommonPrefix;
-      }
-    }
-  }
-  if (lc.completionStrings.size() != 1) {  // beep if ambiguous
-    beep();
-  }
-
-  // if we can extend the item, extend it and return to main loop
-  if (longestCommonPrefix > itemLength) {
-    displayLength = len + longestCommonPrefix - itemLength;
-    if (displayLength > buflen) {
-      longestCommonPrefix -= displayLength - buflen;  // don't overflow buffer
-      displayLength = buflen;                         // truncate the insertion
-      beep();                                         // and make a noise
-    }
-    Utf32String displayText(displayLength + 1);
-    memcpy(displayText.get(), buf32, sizeof(char32_t) * startIndex);
-    memcpy(&displayText[startIndex], &lc.completionStrings[0][0],
-           sizeof(char32_t) * longestCommonPrefix);
-    int tailIndex = startIndex + longestCommonPrefix;
-    memcpy(&displayText[tailIndex], &buf32[pos],
-           sizeof(char32_t) * (displayLength - tailIndex + 1));
-    copyString32(buf32, displayText.get(), displayLength);
-    pos = startIndex + longestCommonPrefix;
-    len = displayLength;
-    refreshLine(pi);
-    return 0;
-  }
-
-  // we can't complete any further, wait for second tab
-  do {
-    c = linenoiseReadChar();
-    c = cleanupCtrl(c);
-  } while (c == static_cast<char32_t>(-1));
-
-  // if any character other than tab, pass it to the main loop
-  if (c != ctrlChar('I')) {
-    freeCompletions(&lc);
-    return c;
-  }
-
-  // we got a second tab, maybe show list of possible completions
-  bool showCompletions = true;
-  bool onNewLine = false;
-  if (lc.completionStrings.size() > completionCountCutoff) {
-    int savePos =
-        pos;  // move cursor to EOL to avoid overwriting the command line
-    pos = len;
-    refreshLine(pi);
-    pos = savePos;
-    printf("\nDisplay all %u possibilities? (y or n)",
-           static_cast<unsigned int>(lc.completionStrings.size()));
-    fflush(stdout);
-    onNewLine = true;
-    while (c != 'y' && c != 'Y' && c != 'n' && c != 'N' && c != ctrlChar('C')) {
-      do {
-        c = linenoiseReadChar();
-        c = cleanupCtrl(c);
-      } while (c == static_cast<char32_t>(-1));
-    }
-    switch (c) {
-      case 'n':
-      case 'N':
-        showCompletions = false;
-        freeCompletions(&lc);
-        break;
-      case ctrlChar('C'):
-        showCompletions = false;
-        freeCompletions(&lc);
-        if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
-        c = 0;
-        break;
-    }
-  }
-
-  // if showing the list, do it the way readline does it
-  bool stopList = false;
-  if (showCompletions) {
-    int longestCompletion = 0;
-    for (size_t j = 0; j < lc.completionStrings.size(); ++j) {
-      itemLength = static_cast<int>(lc.completionStrings[j].length());
-      if (itemLength > longestCompletion) {
-        longestCompletion = itemLength;
-      }
-    }
-    longestCompletion += 2;
-    int columnCount = pi.promptScreenColumns / longestCompletion;
-    if (columnCount < 1) {
-      columnCount = 1;
-    }
-    if (!onNewLine) {  // skip this if we showed "Display all %d possibilities?"
-      int savePos =
-          pos;  // move cursor to EOL to avoid overwriting the command line
-      pos = len;
-      refreshLine(pi);
-      pos = savePos;
-    }
-    size_t pauseRow = getScreenRows() - 1;
-    size_t rowCount =
-        (lc.completionStrings.size() + columnCount - 1) / columnCount;
-    for (size_t row = 0; row < rowCount; ++row) {
-      if (row == pauseRow) {
-        printf("\n--More--");
-        fflush(stdout);
-        c = 0;
-        bool doBeep = false;
-        while (c != ' ' && c != '\r' && c != '\n' && c != 'y' && c != 'Y' &&
-               c != 'n' && c != 'N' && c != 'q' && c != 'Q' &&
-               c != ctrlChar('C')) {
-          if (doBeep) {
-            beep();
-          }
-          doBeep = true;
-          do {
-            c = linenoiseReadChar();
-            c = cleanupCtrl(c);
-          } while (c == static_cast<char32_t>(-1));
-        }
-        switch (c) {
-          case ' ':
-          case 'y':
-          case 'Y':
-            printf("\r        \r");
-            pauseRow += getScreenRows() - 1;
-            break;
-          case '\r':
-          case '\n':
-            printf("\r        \r");
-            ++pauseRow;
-            break;
-          case 'n':
-          case 'N':
-          case 'q':
-          case 'Q':
-            printf("\r        \r");
-            stopList = true;
-            break;
-          case ctrlChar('C'):
-            if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
-            stopList = true;
-            break;
-        }
-      } else {
-        printf("\n");
-      }
-      if (stopList) {
-        break;
-      }
-      for (int column = 0; column < columnCount; ++column) {
-        size_t index = (column * rowCount) + row;
-        if (index < lc.completionStrings.size()) {
-          itemLength = static_cast<int>(lc.completionStrings[index].length());
-          fflush(stdout);
-          if (write32(1, lc.completionStrings[index].get(), itemLength) == -1)
-            return -1;
-          if (((column + 1) * rowCount) + row < lc.completionStrings.size()) {
-            for (int k = itemLength; k < longestCompletion; ++k) {
-              printf(" ");
-            }
-          }
-        }
-      }
-    }
-    fflush(stdout);
-    freeCompletions(&lc);
-  }
-
-  // display the prompt on a new line, then redisplay the input buffer
-  if (!stopList || c == ctrlChar('C')) {
-    if (write(1, "\n", 1) == -1) return 0;
-  }
-  if (!pi.write()) return 0;
-#ifndef _WIN32
-  // we have to generate our own newline on line wrap on Linux
-  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
-    if (write(1, "\n", 1) == -1) return 0;
-#endif
-  pi.promptCursorRowOffset = pi.promptExtraLines;
-  refreshLine(pi);
-  return 0;
-}
-
-/**
- * Clear the screen ONLY (no redisplay of anything)
- */
-void linenoiseClearScreen(void) {
-#ifdef _WIN32
-  COORD coord = {0, 0};
-  CONSOLE_SCREEN_BUFFER_INFO inf;
-  HANDLE screenHandle = GetStdHandle(STD_OUTPUT_HANDLE);
-  GetConsoleScreenBufferInfo(screenHandle, &inf);
-  SetConsoleCursorPosition(screenHandle, coord);
-  DWORD count;
-  FillConsoleOutputCharacterA(screenHandle, ' ', inf.dwSize.X * inf.dwSize.Y,
-                              coord, &count);
-#else
-  if (write(1, "\x1b[H\x1b[2J", 7) <= 0) return;
-#endif
-}
-
-void InputBuffer::clearScreen(PromptBase& pi) {
-  linenoiseClearScreen();
-  if (!pi.write()) return;
-#ifndef _WIN32
-  // we have to generate our own newline on line wrap on Linux
-  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
-    if (write(1, "\n", 1) == -1) return;
-#endif
-  pi.promptCursorRowOffset = pi.promptExtraLines;
-  refreshLine(pi);
-}
-
-/**
- * Incremental history search -- take over the prompt and keyboard as the user
- * types a search
- * string, deletes characters from it, changes direction, and either accepts the
- * found line (for
- * execution orediting) or cancels.
- * @param pi        PromptBase struct holding information about the (old,
- * static) prompt and our
- *                  screen position
- * @param startChar the character that began the search, used to set the initial
- * direction
- */
-int InputBuffer::incrementalHistorySearch(PromptBase& pi, int startChar) {
-  size_t bufferSize;
-  size_t ucharCount = 0;
-
-  // if not already recalling, add the current line to the history list so we
-  // don't have to
-  // special case it
-  if (historyIndex == historyLen - 1) {
-    free(history[historyLen - 1]);
-    bufferSize = sizeof(char32_t) * len + 1;
-    unique_ptr<char[]> tempBuffer(new char[bufferSize]);
-    copyString32to8(tempBuffer.get(), bufferSize, buf32);
-    history[historyLen - 1] = strdup8(tempBuffer.get());
-  }
-  int historyLineLength = len;
-  int historyLinePosition = pos;
-  char32_t emptyBuffer[1];
-  char emptyWidths[1];
-  InputBuffer empty(emptyBuffer, emptyWidths, 1);
-  empty.refreshLine(pi);  // erase the old input first
-  DynamicPrompt dp(pi, (startChar == ctrlChar('R')) ? -1 : 1);
-
-  dp.promptPreviousLen = pi.promptPreviousLen;
-  dp.promptPreviousInputLen = pi.promptPreviousInputLen;
-  dynamicRefresh(dp, buf32, historyLineLength,
-                 historyLinePosition);  // draw user's text with our prompt
-
-  // loop until we get an exit character
-  int c = 0;
-  bool keepLooping = true;
-  bool useSearchedLine = true;
-  bool searchAgain = false;
-  char32_t* activeHistoryLine = 0;
-  while (keepLooping) {
-    c = linenoiseReadChar();
-    c = cleanupCtrl(c);  // convert CTRL + <char> into normal ctrl
-
-    switch (c) {
-      // these characters keep the selected text but do not execute it
-      case ctrlChar('A'):  // ctrl-A, move cursor to start of line
-      case HOME_KEY:
-      case ctrlChar('B'):  // ctrl-B, move cursor left by one character
-      case LEFT_ARROW_KEY:
-      case META + 'b':  // meta-B, move cursor left by one word
-      case META + 'B':
-      case CTRL + LEFT_ARROW_KEY:
-      case META + LEFT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
-      case ctrlChar('D'):
-      case META + 'd':  // meta-D, kill word to right of cursor
-      case META + 'D':
-      case ctrlChar('E'):  // ctrl-E, move cursor to end of line
-      case END_KEY:
-      case ctrlChar('F'):  // ctrl-F, move cursor right by one character
-      case RIGHT_ARROW_KEY:
-      case META + 'f':  // meta-F, move cursor right by one word
-      case META + 'F':
-      case CTRL + RIGHT_ARROW_KEY:
-      case META + RIGHT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
-      case META + ctrlChar('H'):
-      case ctrlChar('J'):
-      case ctrlChar('K'):  // ctrl-K, kill from cursor to end of line
-      case ctrlChar('M'):
-      case ctrlChar('N'):  // ctrl-N, recall next line in history
-      case ctrlChar('P'):  // ctrl-P, recall previous line in history
-      case DOWN_ARROW_KEY:
-      case UP_ARROW_KEY:
-      case ctrlChar('T'):  // ctrl-T, transpose characters
-      case ctrlChar(
-          'U'):  // ctrl-U, kill all characters to the left of the cursor
-      case ctrlChar('W'):
-      case META + 'y':  // meta-Y, "yank-pop", rotate popped text
-      case META + 'Y':
-      case 127:
-      case DELETE_KEY:
-      case META + '<':  // start of history
-      case PAGE_UP_KEY:
-      case META + '>':  // end of history
-      case PAGE_DOWN_KEY:
-        keepLooping = false;
-        break;
-
-      // these characters revert the input line to its previous state
-      case ctrlChar('C'):  // ctrl-C, abort this line
-      case ctrlChar('G'):
-      case ctrlChar('L'):  // ctrl-L, clear screen and redisplay line
-        keepLooping = false;
-        useSearchedLine = false;
-        if (c != ctrlChar('L')) {
-          c = -1;  // ctrl-C and ctrl-G just abort the search and do nothing
-                   // else
-        }
-        break;
-
-      // these characters stay in search mode and update the display
-      case ctrlChar('S'):
-      case ctrlChar('R'):
-        if (dp.searchTextLen ==
-            0) {  // if no current search text, recall previous text
-          if (previousSearchText.length()) {
-            dp.updateSearchText(previousSearchText.get());
-          }
-        }
-        if ((dp.direction == 1 && c == ctrlChar('R')) ||
-            (dp.direction == -1 && c == ctrlChar('S'))) {
-          dp.direction = 0 - dp.direction;  // reverse direction
-          dp.updateSearchPrompt();          // change the prompt
-        } else {
-          searchAgain = true;  // same direction, search again
-        }
-        break;
-
-// job control is its own thing
-#ifndef _WIN32
-      case ctrlChar('Z'):  // ctrl-Z, job control
-        disableRawMode();  // Returning to Linux (whatever) shell, leave raw
-                           // mode
-        raise(SIGSTOP);    // Break out in mid-line
-        enableRawMode();   // Back from Linux shell, re-enter raw mode
-        {
-          bufferSize = historyLineLength + 1;
-          unique_ptr<char32_t[]> tempUnicode(new char32_t[bufferSize]);
-          copyString8to32(tempUnicode.get(), bufferSize, ucharCount,
-                          history[historyIndex]);
-          dynamicRefresh(dp, tempUnicode.get(), historyLineLength,
-                         historyLinePosition);
-        }
-        continue;
-        break;
-#endif
-
-      // these characters update the search string, and hence the selected input
-      // line
-      case ctrlChar('H'):  // backspace/ctrl-H, delete char to left of cursor
-        if (dp.searchTextLen > 0) {
-          unique_ptr<char32_t[]> tempUnicode(new char32_t[dp.searchTextLen]);
-          --dp.searchTextLen;
-          dp.searchText[dp.searchTextLen] = 0;
-          copyString32(tempUnicode.get(), dp.searchText.get(),
-                       dp.searchTextLen);
-          dp.updateSearchText(tempUnicode.get());
-        } else {
-          beep();
-        }
-        break;
-
-      case ctrlChar('Y'):  // ctrl-Y, yank killed text
-        break;
-
-      default:
-        if (!isControlChar(c) && c <= 0x0010FFFF) {  // not an action character
-          unique_ptr<char32_t[]> tempUnicode(
-              new char32_t[dp.searchTextLen + 2]);
-          copyString32(tempUnicode.get(), dp.searchText.get(),
-                       dp.searchTextLen);
-          tempUnicode[dp.searchTextLen] = c;
-          tempUnicode[dp.searchTextLen + 1] = 0;
-          dp.updateSearchText(tempUnicode.get());
-        } else {
-          beep();
-        }
-    }  // switch
-
-    // if we are staying in search mode, search now
-    if (keepLooping) {
-      bufferSize = historyLineLength + 1;
-      if (activeHistoryLine) {
-        delete[] activeHistoryLine;
-        activeHistoryLine = nullptr;
-      }
-      activeHistoryLine = new char32_t[bufferSize];
-      copyString8to32(activeHistoryLine, bufferSize, ucharCount,
-                      history[historyIndex]);
-      if (dp.searchTextLen > 0) {
-        bool found = false;
-        int historySearchIndex = historyIndex;
-        int lineLength = static_cast<int>(ucharCount);
-        int lineSearchPos = historyLinePosition;
-        if (searchAgain) {
-          lineSearchPos += dp.direction;
-        }
-        searchAgain = false;
-        while (true) {
-          while ((dp.direction > 0) ? (lineSearchPos < lineLength)
-                                    : (lineSearchPos >= 0)) {
-            if (strncmp32(dp.searchText.get(),
-                          &activeHistoryLine[lineSearchPos],
-                          dp.searchTextLen) == 0) {
-              found = true;
-              break;
-            }
-            lineSearchPos += dp.direction;
-          }
-          if (found) {
-            historyIndex = historySearchIndex;
-            historyLineLength = lineLength;
-            historyLinePosition = lineSearchPos;
-            break;
-          } else if ((dp.direction > 0) ? (historySearchIndex < historyLen - 1)
-                                        : (historySearchIndex > 0)) {
-            historySearchIndex += dp.direction;
-            bufferSize = strlen8(history[historySearchIndex]) + 1;
-            delete[] activeHistoryLine;
-            activeHistoryLine = nullptr;
-            activeHistoryLine = new char32_t[bufferSize];
-            copyString8to32(activeHistoryLine, bufferSize, ucharCount,
-                            history[historySearchIndex]);
-            lineLength = static_cast<int>(ucharCount);
-            lineSearchPos =
-                (dp.direction > 0) ? 0 : (lineLength - dp.searchTextLen);
-          } else {
-            beep();
-            break;
-          }
-        };  // while
-      }
-      if (activeHistoryLine) {
-        delete[] activeHistoryLine;
-        activeHistoryLine = nullptr;
-      }
-      bufferSize = historyLineLength + 1;
-      activeHistoryLine = new char32_t[bufferSize];
-      copyString8to32(activeHistoryLine, bufferSize, ucharCount,
-                      history[historyIndex]);
-      dynamicRefresh(dp, activeHistoryLine, historyLineLength,
-                     historyLinePosition);  // draw user's text with our prompt
-    }
-  }  // while
-
-  // leaving history search, restore previous prompt, maybe make searched line
-  // current
-  PromptBase pb;
-  pb.promptChars = pi.promptIndentation;
-  pb.promptBytes = pi.promptBytes;
-  Utf32String tempUnicode(pb.promptBytes + 1);
-
-  copyString32(tempUnicode.get(), &pi.promptText[pi.promptLastLinePosition],
-               pb.promptBytes - pi.promptLastLinePosition);
-  tempUnicode.initFromBuffer();
-  pb.promptText = tempUnicode;
-  pb.promptExtraLines = 0;
-  pb.promptIndentation = pi.promptIndentation;
-  pb.promptLastLinePosition = 0;
-  pb.promptPreviousInputLen = historyLineLength;
-  pb.promptCursorRowOffset = dp.promptCursorRowOffset;
-  pb.promptScreenColumns = pi.promptScreenColumns;
-  pb.promptPreviousLen = dp.promptChars;
-  if (useSearchedLine && activeHistoryLine) {
-    historyRecallMostRecent = true;
-    copyString32(buf32, activeHistoryLine, buflen + 1);
-    len = historyLineLength;
-    pos = historyLinePosition;
-  }
-  if (activeHistoryLine) {
-    delete[] activeHistoryLine;
-    activeHistoryLine = nullptr;
-  }
-  dynamicRefresh(pb, buf32, len,
-                 pos);  // redraw the original prompt with current input
-  pi.promptPreviousInputLen = len;
-  pi.promptCursorRowOffset = pi.promptExtraLines + pb.promptCursorRowOffset;
-  previousSearchText =
-      dp.searchText;  // save search text for possible reuse on ctrl-R ctrl-R
-  return c;           // pass a character or -1 back to main loop
-}
-
-static bool isCharacterAlphanumeric(char32_t testChar) {
-#ifdef _WIN32
-  return (iswalnum((wint_t)testChar) != 0 ? true : false);
-#else
-  return (iswalnum(testChar) != 0 ? true : false);
-#endif
-}
-
-#ifndef _WIN32
-static bool gotResize = false;
-#endif
-static int keyType = 0;
-
-int InputBuffer::getInputLine(PromptBase& pi) {
-  keyType = 0;
-
-  // The latest history entry is always our current buffer
-  if (len > 0) {
-    size_t bufferSize = sizeof(char32_t) * len + 1;
-    unique_ptr<char[]> tempBuffer(new char[bufferSize]);
-    copyString32to8(tempBuffer.get(), bufferSize, buf32);
-    linenoiseHistoryAdd(tempBuffer.get());
-  } else {
-    linenoiseHistoryAdd("");
-  }
-  historyIndex = historyLen - 1;
-  historyRecallMostRecent = false;
-
-  // display the prompt
-  if (!pi.write()) return -1;
-
-#ifndef _WIN32
-  // we have to generate our own newline on line wrap on Linux
-  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
-    if (write(1, "\n", 1) == -1) return -1;
-#endif
-
-  // the cursor starts out at the end of the prompt
-  pi.promptCursorRowOffset = pi.promptExtraLines;
-
-  // kill and yank start in "other" mode
-  killRing.lastAction = KillRing::actionOther;
-
-  // when history search returns control to us, we execute its terminating
-  // keystroke
-  int terminatingKeystroke = -1;
-
-  // if there is already text in the buffer, display it first
-  if (len > 0) {
-    refreshLine(pi);
-  }
-
-  // loop collecting characters, respond to line editing characters
-  while (true) {
-    int c;
-    if (terminatingKeystroke == -1) {
-      c = linenoiseReadChar();  // get a new keystroke
-
-      keyType = 0; 
-      if (c != 0) {
-        // set flag that we got some input
-        if (c == ctrlChar('C')) {
-          keyType = 1;
-        } else if (c == ctrlChar('D')) {
-          keyType = 2;
-        }
-      }
-
-#ifndef _WIN32
-      if (c == 0 && gotResize) {
-        // caught a window resize event
-        // now redraw the prompt and line
-        gotResize = false;
-        pi.promptScreenColumns = getScreenColumns();
-        dynamicRefresh(pi, buf32, len,
-                       pos);  // redraw the original prompt with current input
-        continue;
-      }
-#endif
-    } else {
-      c = terminatingKeystroke;   // use the terminating keystroke from search
-      terminatingKeystroke = -1;  // clear it once we've used it
-    }
-
-    c = cleanupCtrl(c);  // convert CTRL + <char> into normal ctrl
-
-    if (c == 0) {
-      return len;
-    }
-
-    if (c == -1) {
-      refreshLine(pi);
-      continue;
-    }
-
-    if (c == -2) {
-      if (!pi.write()) return -1;
-      refreshLine(pi);
-      continue;
-    }
-
-    // ctrl-I/tab, command completion, needs to be before switch statement
-    if (c == ctrlChar('I') && completionCallback) {
-      killRing.lastAction = KillRing::actionOther;
-      historyRecallMostRecent = false;
-
-      // completeLine does the actual completion and replacement
-      c = completeLine(pi);
-
-      if (c < 0)  // return on error
-        return len;
-
-      if (c == 0)  // read next character when 0
-        continue;
-
-      // deliberate fall-through here, so we use the terminating character
-    }
-
-    switch (c) {
-      case ctrlChar('A'):  // ctrl-A, move cursor to start of line
-      case HOME_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        pos = 0;
-        refreshLine(pi);
-        break;
-
-      case ctrlChar('B'):  // ctrl-B, move cursor left by one character
-      case LEFT_ARROW_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        if (pos > 0) {
-          --pos;
-          refreshLine(pi);
-        }
-        break;
-
-      case META + 'b':  // meta-B, move cursor left by one word
-      case META + 'B':
-      case CTRL + LEFT_ARROW_KEY:
-      case META + LEFT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
-        killRing.lastAction = KillRing::actionOther;
-        if (pos > 0) {
-          while (pos > 0 && !isCharacterAlphanumeric(buf32[pos - 1])) {
-            --pos;
-          }
-          while (pos > 0 && isCharacterAlphanumeric(buf32[pos - 1])) {
-            --pos;
-          }
-          refreshLine(pi);
-        }
-        break;
-
-      case ctrlChar('C'):  // ctrl-C, abort this line
-        killRing.lastAction = KillRing::actionOther;
-        historyRecallMostRecent = false;
-        errno = EAGAIN;
-        --historyLen;
-        free(history[historyLen]);
-        // we need one last refresh with the cursor at the end of the line
-        // so we don't display the next prompt over the previous input line
-        pos = len;  // pass len as pos for EOL
-        refreshLine(pi);
-        if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
-        return -1;
-
-      case META + 'c':  // meta-C, give word initial Cap
-      case META + 'C':
-        killRing.lastAction = KillRing::actionOther;
-        historyRecallMostRecent = false;
-        if (pos < len) {
-          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
-            ++pos;
-          }
-          if (pos < len && isCharacterAlphanumeric(buf32[pos])) {
-            if (buf32[pos] >= 'a' && buf32[pos] <= 'z') {
-              buf32[pos] += 'A' - 'a';
-            }
-            ++pos;
-          }
-          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
-            if (buf32[pos] >= 'A' && buf32[pos] <= 'Z') {
-              buf32[pos] += 'a' - 'A';
-            }
-            ++pos;
-          }
-          refreshLine(pi);
-        }
-        break;
-
-      // ctrl-D, delete the character under the cursor
-      // on an empty line, exit the shell
-      case ctrlChar('D'):
-        killRing.lastAction = KillRing::actionOther;
-        if (len > 0 && pos < len) {
-          historyRecallMostRecent = false;
-          memmove(buf32 + pos, buf32 + pos + 1, sizeof(char32_t) * (len - pos));
-          --len;
-          refreshLine(pi);
-        } else if (len == 0) {
-          --historyLen;
-          free(history[historyLen]);
-          return -1;
-        }
-        break;
-
-      case META + 'd':  // meta-D, kill word to right of cursor
-      case META + 'D':
-        if (pos < len) {
-          historyRecallMostRecent = false;
-          int endingPos = pos;
-          while (endingPos < len &&
-                 !isCharacterAlphanumeric(buf32[endingPos])) {
-            ++endingPos;
-          }
-          while (endingPos < len && isCharacterAlphanumeric(buf32[endingPos])) {
-            ++endingPos;
-          }
-          killRing.kill(&buf32[pos], endingPos - pos, true);
-          memmove(buf32 + pos, buf32 + endingPos,
-                  sizeof(char32_t) * (len - endingPos + 1));
-          len -= endingPos - pos;
-          refreshLine(pi);
-        }
-        killRing.lastAction = KillRing::actionKill;
-        break;
-
-      case ctrlChar('E'):  // ctrl-E, move cursor to end of line
-      case END_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        pos = len;
-        refreshLine(pi);
-        break;
-
-      case ctrlChar('F'):  // ctrl-F, move cursor right by one character
-      case RIGHT_ARROW_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        if (pos < len) {
-          ++pos;
-          refreshLine(pi);
-        }
-        break;
-
-      case META + 'f':  // meta-F, move cursor right by one word
-      case META + 'F':
-      case CTRL + RIGHT_ARROW_KEY:
-      case META + RIGHT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
-        killRing.lastAction = KillRing::actionOther;
-        if (pos < len) {
-          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
-            ++pos;
-          }
-          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
-            ++pos;
-          }
-          refreshLine(pi);
-        }
-        break;
-
-      case ctrlChar('H'):  // backspace/ctrl-H, delete char to left of cursor
-        killRing.lastAction = KillRing::actionOther;
-        if (pos > 0) {
-          historyRecallMostRecent = false;
-          memmove(buf32 + pos - 1, buf32 + pos,
-                  sizeof(char32_t) * (1 + len - pos));
-          --pos;
-          --len;
-          refreshLine(pi);
-        }
-        break;
-
-      // meta-Backspace, kill word to left of cursor
-      case META + ctrlChar('H'):
-        if (pos > 0) {
-          historyRecallMostRecent = false;
-          int startingPos = pos;
-          while (pos > 0 && !isCharacterAlphanumeric(buf32[pos - 1])) {
-            --pos;
-          }
-          while (pos > 0 && isCharacterAlphanumeric(buf32[pos - 1])) {
-            --pos;
-          }
-          killRing.kill(&buf32[pos], startingPos - pos, false);
-          memmove(buf32 + pos, buf32 + startingPos,
-                  sizeof(char32_t) * (len - startingPos + 1));
-          len -= startingPos - pos;
-          refreshLine(pi);
-        }
-        killRing.lastAction = KillRing::actionKill;
-        break;
-
-      case ctrlChar('J'):  // ctrl-J/linefeed/newline, accept line
-      case ctrlChar('M'):  // ctrl-M/return/enter
-        killRing.lastAction = KillRing::actionOther;
-        // we need one last refresh with the cursor at the end of the line
-        // so we don't display the next prompt over the previous input line
-        pos = len;  // pass len as pos for EOL
-        refreshLine(pi);
-        historyPreviousIndex = historyRecallMostRecent ? historyIndex : -2;
-        --historyLen;
-        free(history[historyLen]);
-        return len;
-
-      case ctrlChar('K'):  // ctrl-K, kill from cursor to end of line
-        killRing.kill(&buf32[pos], len - pos, true);
-        buf32[pos] = '\0';
-        len = pos;
-        refreshLine(pi);
-        killRing.lastAction = KillRing::actionKill;
-        historyRecallMostRecent = false;
-        break;
-
-      case ctrlChar('L'):  // ctrl-L, clear screen and redisplay line
-        clearScreen(pi);
-        break;
-
-      case META + 'l':  // meta-L, lowercase word
-      case META + 'L':
-        killRing.lastAction = KillRing::actionOther;
-        if (pos < len) {
-          historyRecallMostRecent = false;
-          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
-            ++pos;
-          }
-          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
-            if (buf32[pos] >= 'A' && buf32[pos] <= 'Z') {
-              buf32[pos] += 'a' - 'A';
-            }
-            ++pos;
-          }
-          refreshLine(pi);
-        }
-        break;
-
-      case ctrlChar('N'):  // ctrl-N, recall next line in history
-      case ctrlChar('P'):  // ctrl-P, recall previous line in history
-      case DOWN_ARROW_KEY:
-      case UP_ARROW_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        // if not already recalling, add the current line to the history list so
-        // we don't
-        // have to special case it
-        if (historyIndex == historyLen - 1) {
-          free(history[historyLen - 1]);
-          size_t tempBufferSize = sizeof(char32_t) * len + 1;
-          unique_ptr<char[]> tempBuffer(new char[tempBufferSize]);
-          copyString32to8(tempBuffer.get(), tempBufferSize, buf32);
-          history[historyLen - 1] = strdup8(tempBuffer.get());
-        }
-        if (historyLen > 1) {
-          if (c == UP_ARROW_KEY) {
-            c = ctrlChar('P');
-          }
-          if (historyPreviousIndex != -2 && c != ctrlChar('P')) {
-            historyIndex =
-                1 + historyPreviousIndex;  // emulate Windows down-arrow
-          } else {
-            historyIndex += (c == ctrlChar('P')) ? -1 : 1;
-          }
-          historyPreviousIndex = -2;
-          if (historyIndex < 0) {
-            historyIndex = 0;
-            break;
-          } else if (historyIndex >= historyLen) {
-            historyIndex = historyLen - 1;
-            break;
-          }
-          historyRecallMostRecent = true;
-          size_t ucharCount = 0;
-          copyString8to32(buf32, buflen, ucharCount, history[historyIndex]);
-          len = pos = static_cast<int>(ucharCount);
-          refreshLine(pi);
-        }
-        break;
-
-      case ctrlChar('R'):  // ctrl-R, reverse history search
-      case ctrlChar('S'):  // ctrl-S, forward history search
-        terminatingKeystroke = incrementalHistorySearch(pi, c);
-        break;
-
-      case ctrlChar('T'):  // ctrl-T, transpose characters
-        killRing.lastAction = KillRing::actionOther;
-        if (pos > 0 && len > 1) {
-          historyRecallMostRecent = false;
-          size_t leftCharPos = (pos == len) ? pos - 2 : pos - 1;
-          char32_t aux = buf32[leftCharPos];
-          buf32[leftCharPos] = buf32[leftCharPos + 1];
-          buf32[leftCharPos + 1] = aux;
-          if (pos != len) ++pos;
-          refreshLine(pi);
-        }
-        break;
-
-      case ctrlChar(
-          'U'):  // ctrl-U, kill all characters to the left of the cursor
-        if (pos > 0) {
-          historyRecallMostRecent = false;
-          killRing.kill(&buf32[0], pos, false);
-          len -= pos;
-          memmove(buf32, buf32 + pos, sizeof(char32_t) * (len + 1));
-          pos = 0;
-          refreshLine(pi);
-        }
-        killRing.lastAction = KillRing::actionKill;
-        break;
-
-      case META + 'u':  // meta-U, uppercase word
-      case META + 'U':
-        killRing.lastAction = KillRing::actionOther;
-        if (pos < len) {
-          historyRecallMostRecent = false;
-          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
-            ++pos;
-          }
-          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
-            if (buf32[pos] >= 'a' && buf32[pos] <= 'z') {
-              buf32[pos] += 'A' - 'a';
-            }
-            ++pos;
-          }
-          refreshLine(pi);
-        }
-        break;
-
-      // ctrl-W, kill to whitespace (not word) to left of cursor
-      case ctrlChar('W'):
-        if (pos > 0) {
-          historyRecallMostRecent = false;
-          int startingPos = pos;
-          while (pos > 0 && buf32[pos - 1] == ' ') {
-            --pos;
-          }
-          while (pos > 0 && buf32[pos - 1] != ' ') {
-            --pos;
-          }
-          killRing.kill(&buf32[pos], startingPos - pos, false);
-          memmove(buf32 + pos, buf32 + startingPos,
-                  sizeof(char32_t) * (len - startingPos + 1));
-          len -= startingPos - pos;
-          refreshLine(pi);
-        }
-        killRing.lastAction = KillRing::actionKill;
-        break;
-
-      case ctrlChar('Y'):  // ctrl-Y, yank killed text
-        historyRecallMostRecent = false;
-        {
-          Utf32String* restoredText = killRing.yank();
-          if (restoredText) {
-            bool truncated = false;
-            size_t ucharCount = restoredText->length();
-            if (ucharCount > static_cast<size_t>(buflen - len)) {
-              ucharCount = buflen - len;
-              truncated = true;
-            }
-            memmove(buf32 + pos + ucharCount, buf32 + pos,
-                    sizeof(char32_t) * (len - pos + 1));
-            memmove(buf32 + pos, restoredText->get(),
-                    sizeof(char32_t) * ucharCount);
-            pos += static_cast<int>(ucharCount);
-            len += static_cast<int>(ucharCount);
-            refreshLine(pi);
-            killRing.lastAction = KillRing::actionYank;
-            killRing.lastYankSize = ucharCount;
-            if (truncated) {
-              beep();
-            }
-          } else {
-            beep();
-          }
-        }
-        break;
-
-      case META + 'y':  // meta-Y, "yank-pop", rotate popped text
-      case META + 'Y':
-        if (killRing.lastAction == KillRing::actionYank) {
-          historyRecallMostRecent = false;
-          Utf32String* restoredText = killRing.yankPop();
-          if (restoredText) {
-            bool truncated = false;
-            size_t ucharCount = restoredText->length();
-            if (ucharCount >
-                static_cast<size_t>(killRing.lastYankSize + buflen - len)) {
-              ucharCount = killRing.lastYankSize + buflen - len;
-              truncated = true;
-            }
-            if (ucharCount > killRing.lastYankSize) {
-              memmove(buf32 + pos + ucharCount - killRing.lastYankSize,
-                      buf32 + pos, sizeof(char32_t) * (len - pos + 1));
-              memmove(buf32 + pos - killRing.lastYankSize, restoredText->get(),
-                      sizeof(char32_t) * ucharCount);
-            } else {
-              memmove(buf32 + pos - killRing.lastYankSize, restoredText->get(),
-                      sizeof(char32_t) * ucharCount);
-              memmove(buf32 + pos + ucharCount - killRing.lastYankSize,
-                      buf32 + pos, sizeof(char32_t) * (len - pos + 1));
-            }
-            pos += static_cast<int>(ucharCount - killRing.lastYankSize);
-            len += static_cast<int>(ucharCount - killRing.lastYankSize);
-            killRing.lastYankSize = ucharCount;
-            refreshLine(pi);
-            if (truncated) {
-              beep();
-            }
-            break;
-          }
-        }
-        beep();
-        break;
-
-#ifndef _WIN32
-      case ctrlChar('Z'):  // ctrl-Z, job control
-        disableRawMode();  // Returning to Linux (whatever) shell, leave raw
-                           // mode
-        raise(SIGSTOP);    // Break out in mid-line
-        enableRawMode();   // Back from Linux shell, re-enter raw mode
-        if (!pi.write()) break;  // Redraw prompt
-        refreshLine(pi);         // Refresh the line
-        break;
-#endif
-
-      // DEL, delete the character under the cursor
-      case 127:
-      case DELETE_KEY:
-        killRing.lastAction = KillRing::actionOther;
-        if (len > 0 && pos < len) {
-          historyRecallMostRecent = false;
-          memmove(buf32 + pos, buf32 + pos + 1, sizeof(char32_t) * (len - pos));
-          --len;
-          refreshLine(pi);
-        }
-        break;
-
-      case META + '<':     // meta-<, beginning of history
-      case PAGE_UP_KEY:    // Page Up, beginning of history
-      case META + '>':     // meta->, end of history
-      case PAGE_DOWN_KEY:  // Page Down, end of history
-        killRing.lastAction = KillRing::actionOther;
-        // if not already recalling, add the current line to the history list so
-        // we don't
-        // have to special case it
-        if (historyIndex == historyLen - 1) {
-          free(history[historyLen - 1]);
-          size_t tempBufferSize = sizeof(char32_t) * len + 1;
-          unique_ptr<char[]> tempBuffer(new char[tempBufferSize]);
-          copyString32to8(tempBuffer.get(), tempBufferSize, buf32);
-          history[historyLen - 1] = strdup8(tempBuffer.get());
-        }
-        if (historyLen > 1) {
-          historyIndex =
-              (c == META + '<' || c == PAGE_UP_KEY) ? 0 : historyLen - 1;
-          historyPreviousIndex = -2;
-          historyRecallMostRecent = true;
-          size_t ucharCount = 0;
-          copyString8to32(buf32, buflen, ucharCount, history[historyIndex]);
-          len = pos = static_cast<int>(ucharCount);
-          refreshLine(pi);
-        }
-        break;
-
-      // not one of our special characters, maybe insert it in the buffer
-      default:
-        killRing.lastAction = KillRing::actionOther;
-        historyRecallMostRecent = false;
-        if (c & (META | CTRL)) {  // beep on unknown Ctrl and/or Meta keys
-          beep();
-          break;
-        }
-        if (len < buflen) {
-          if (isControlChar(c)) {  // don't insert control characters
-            beep();
-            break;
-          }
-          if (len == pos) {  // at end of buffer
-            buf32[pos] = c;
-            ++pos;
-            ++len;
-            buf32[len] = '\0';
-            int inputLen = calculateColumnPosition(buf32, len);
-            if (pi.promptIndentation + inputLen < pi.promptScreenColumns) {
-              if (inputLen > pi.promptPreviousInputLen)
-                pi.promptPreviousInputLen = inputLen;
-              /* Avoid a full update of the line in the
-               * trivial case. */
-              if (write32(1, reinterpret_cast<char32_t*>(&c), 1) == -1)
-                return -1;
-            } else {
-              refreshLine(pi);
-            }
-          } else {  // not at end of buffer, have to move characters to our
-                    // right
-            memmove(buf32 + pos + 1, buf32 + pos,
-                    sizeof(char32_t) * (len - pos));
-            buf32[pos] = c;
-            ++len;
-            ++pos;
-            buf32[len] = '\0';
-            refreshLine(pi);
-          }
-        } else {
-          beep();  // buffer is full, beep on new characters
-        }
-        break;
-    }
-  }
-  return len;
-}
-
-static string preloadedBufferContents;  // used with linenoisePreloadBuffer
-static string preloadErrorMessage;
-
-/**
- * linenoisePreloadBuffer provides text to be inserted into the command buffer
- *
- * the provided text will be processed to be usable and will be used to preload
- * the input buffer on the next call to linenoise()
- *
- * @param preloadText text to begin with on the next call to linenoise()
- */
-void linenoisePreloadBuffer(const char* preloadText) {
-  if (!preloadText) {
-    return;
-  }
-  int bufferSize = static_cast<int>(strlen(preloadText) + 1);
-  unique_ptr<char[]> tempBuffer(new char[bufferSize]);
-  strncpy(&tempBuffer[0], preloadText, bufferSize);
-
-  // remove characters that won't display correctly
-  char* pIn = &tempBuffer[0];
-  char* pOut = pIn;
-  bool controlsStripped = false;
-  bool whitespaceSeen = false;
-  while (*pIn) {
-    unsigned char c =
-        *pIn++;       // we need unsigned so chars 0x80 and above are allowed
-    if ('\r' == c) {  // silently skip CR
-      continue;
-    }
-    if ('\n' == c || '\t' == c) {  // note newline or tab
-      whitespaceSeen = true;
-      continue;
-    }
-    if (isControlChar(
-            c)) {  // remove other control characters, flag for message
-      controlsStripped = true;
-      *pOut++ = ' ';
-      continue;
-    }
-    if (whitespaceSeen) {  // convert whitespace to a single space
-      *pOut++ = ' ';
-      whitespaceSeen = false;
-    }
-    *pOut++ = c;
-  }
-  *pOut = 0;
-  int processedLength = static_cast<int>(pOut - tempBuffer.get());
-  bool lineTruncated = false;
-  if (processedLength > (LINENOISE_MAX_LINE - 1)) {
-    lineTruncated = true;
-    tempBuffer[LINENOISE_MAX_LINE - 1] = 0;
-  }
-  preloadedBufferContents = tempBuffer.get();
-  if (controlsStripped) {
-    preloadErrorMessage +=
-        " [Edited line: control characters were converted to spaces]\n";
-  }
-  if (lineTruncated) {
-    preloadErrorMessage += " [Edited line: the line length was reduced from ";
-    char buf[128];
-    snprintf(buf, sizeof(buf), "%d to %d]\n", processedLength,
-             (LINENOISE_MAX_LINE - 1));
-    preloadErrorMessage += buf;
-  }
-}
-
-/**
- * linenoise is a readline replacement.
- *
- * call it with a prompt to display and it will return a line of input from the
- * user
- *
- * @param prompt text of prompt to display to the user
- * @return       the returned string belongs to the caller on return and must be
- * freed to prevent
- *               memory leaks
- */
-char* linenoise(const char* prompt) {
-#ifndef _WIN32
-  gotResize = false;
-#endif
-  if (isatty(STDIN_FILENO)) {  // input is from a terminal
-    char32_t buf32[LINENOISE_MAX_LINE];
-    char charWidths[LINENOISE_MAX_LINE];
-    if (!preloadErrorMessage.empty()) {
-      printf("%s", preloadErrorMessage.c_str());
-      fflush(stdout);
-      preloadErrorMessage.clear();
-    }
-    PromptInfo pi(prompt, getScreenColumns());
-    if (isUnsupportedTerm()) {
-      if (!pi.write()) return 0;
-      fflush(stdout);
-      if (preloadedBufferContents.empty()) {
-        unique_ptr<char[]> buf8(new char[LINENOISE_MAX_LINE]);
-        if (fgets(buf8.get(), LINENOISE_MAX_LINE, stdin) == NULL) {
-          return NULL;
-        }
-        size_t len = strlen(buf8.get());
-        while (len && (buf8[len - 1] == '\n' || buf8[len - 1] == '\r')) {
-          --len;
-          buf8[len] = '\0';
-        }
-        return strdup(buf8.get());  // caller must free buffer
-      } else {
-        char* buf8 = strdup(preloadedBufferContents.c_str());
-        preloadedBufferContents.clear();
-        return buf8;  // caller must free buffer
-      }
-    } else {
-      if (enableRawMode() == -1) {
-        return NULL;
-      }
-      InputBuffer ib(buf32, charWidths, LINENOISE_MAX_LINE);
-      if (!preloadedBufferContents.empty()) {
-        ib.preloadBuffer(preloadedBufferContents.c_str());
-        preloadedBufferContents.clear();
-      }
-      int count = ib.getInputLine(pi);
-      disableRawMode();
-      printf("\n");
-      if (count == -1) {
-        return NULL;
-      }
-      size_t bufferSize = sizeof(char32_t) * ib.length() + 1;
-      unique_ptr<char[]> buf8(new char[bufferSize]);
-      copyString32to8(buf8.get(), bufferSize, buf32);
-      return strdup(buf8.get());  // caller must free buffer
-    }
-  } else {  // input not from a terminal, we should work with piped input, i.e.
-            // redirected stdin
-    unique_ptr<char[]> buf8(new char[LINENOISE_MAX_LINE]);
-    if (fgets(buf8.get(), LINENOISE_MAX_LINE, stdin) == NULL) {
-      return NULL;
-    }
-
-    // if fgets() gave us the newline, remove it
-    int count = static_cast<int>(strlen(buf8.get()));
-    if (count > 0 && buf8[count - 1] == '\n') {
-      --count;
-      buf8[count] = '\0';
-    }
-    return strdup(buf8.get());  // caller must free buffer
-  }
-}
-
-/* Register a callback function to be called for tab-completion. */
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback* fn) {
-  completionCallback = fn;
-}
-
-void linenoiseAddCompletion(linenoiseCompletions* lc, const char* str) {
-  lc->completionStrings.push_back(Utf32String(str));
-}
-
-int linenoiseHistoryAdd(const char* line) {
-  if (historyMaxLen == 0) {
-    return 0;
-  }
-  if (history == NULL) {
-    history =
-        reinterpret_cast<char8_t**>(malloc(sizeof(char8_t*) * historyMaxLen));
-    if (history == NULL) {
-      return 0;
-    }
-    memset(history, 0, (sizeof(char*) * historyMaxLen));
-  }
-  char8_t* linecopy = strdup8(line);
-  if (!linecopy) {
-    return 0;
-  }
-
-  // convert newlines in multi-line code to spaces before storing
-  char8_t* p = linecopy;
-  while (*p) {
-    if (*p == '\n') {
-      *p = ' ';
-    }
-    ++p;
-  }
-
-  // prevent duplicate history entries
-  if (historyLen > 0 && history[historyLen - 1] != nullptr &&
-      strcmp(reinterpret_cast<char const*>(history[historyLen - 1]),
-             reinterpret_cast<char const*>(linecopy)) == 0) {
-    free(linecopy);
-    return 0;
-  }
-
-  if (historyLen == historyMaxLen) {
-    free(history[0]);
-    memmove(history, history + 1, sizeof(char*) * (historyMaxLen - 1));
-    --historyLen;
-    if (--historyPreviousIndex < -1) {
-      historyPreviousIndex = -2;
-    }
-  }
-
-  history[historyLen] = linecopy;
-  ++historyLen;
-  return 1;
-}
-
-int linenoiseHistorySetMaxLen(int len) {
-  if (len < 1) {
-    return 0;
-  }
-  if (history) {
-    int tocopy = historyLen;
-    char8_t** newHistory =
-        reinterpret_cast<char8_t**>(malloc(sizeof(char8_t*) * len));
-    if (newHistory == NULL) {
-      return 0;
-    }
-    if (len < tocopy) {
-      tocopy = len;
-    }
-    memcpy(newHistory, history + historyMaxLen - tocopy,
-           sizeof(char8_t*) * tocopy);
-    free(history);
-    history = newHistory;
-  }
-  historyMaxLen = len;
-  if (historyLen > historyMaxLen) {
-    historyLen = historyMaxLen;
-  }
-  return 1;
-}
-
-/* Fetch a line of the history by (zero-based) index.  If the requested
- * line does not exist, NULL is returned.  The return value is a heap-allocated
- * copy of the line, and the caller is responsible for de-allocating it. */
-char* linenoiseHistoryLine(int index) {
-  if (index < 0 || index >= historyLen) return NULL;
-
-  return strdup(reinterpret_cast<char const*>(history[index]));
-}
-
-/* Save the history in the specified file. On success 0 is returned
- * otherwise -1 is returned. */
-int linenoiseHistorySave(const char* filename) {
-#if _WIN32
-  FILE* fp = fopen(filename, "wt");
-#else
-  int fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR);
-
-  if (fd < 0) {
-    return -1;
-  }
-
-  FILE* fp = fdopen(fd, "wt");
-#endif
-
-  if (fp == NULL) {
-    return -1;
-  }
-
-  for (int j = 0; j < historyLen; ++j) {
-    if (history[j][0] != '\0') {
-      fprintf(fp, "%s\n", history[j]);
-    }
-  }
-
-  fclose(fp);
-
-  return 0;
-}
-
-/* Load the history from the specified file. If the file does not exist
- * zero is returned and no operation is performed.
- *
- * If the file exists and the operation succeeded 0 is returned, otherwise
- * on error -1 is returned. */
-int linenoiseHistoryLoad(const char* filename) {
-  FILE* fp = fopen(filename, "rt");
-  if (fp == NULL) {
-    return -1;
-  }
-
-  char buf[LINENOISE_MAX_LINE];
-  while (fgets(buf, LINENOISE_MAX_LINE, fp) != NULL) {
-    char* p = strchr(buf, '\r');
-    if (!p) {
-      p = strchr(buf, '\n');
-    }
-    if (p) {
-      *p = '\0';
-    }
-    if (p != buf) {
-      linenoiseHistoryAdd(buf);
-    }
-  }
-  fclose(fp);
-  return 0;
-}
-
-/* Set if to use or not the multi line mode. */
-/* note that this is a stub only, as linenoise-ng always multi-line */
-void linenoiseSetMultiLine(int) {}
-
-/* This special mode is used by linenoise in order to print scan codes
- * on screen for debugging / development purposes. It is implemented
- * by the linenoise_example program using the --keycodes option. */
-void linenoisePrintKeyCodes(void) {
-  char quit[4];
-
-  printf(
-      "Linenoise key codes debugging mode.\n"
-      "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
-  if (enableRawMode() == -1) return;
-  memset(quit, ' ', 4);
-  while (1) {
-    char c;
-    int nread;
-
-#if _WIN32
-    nread = _read(STDIN_FILENO, &c, 1);
-#else
-    nread = read(STDIN_FILENO, &c, 1);
-#endif
-    if (nread <= 0) continue;
-    memmove(quit, quit + 1, sizeof(quit) - 1); /* shift string to left. */
-    quit[sizeof(quit) - 1] = c; /* Insert current char on the right. */
-    if (memcmp(quit, "quit", sizeof(quit)) == 0) break;
-
-    printf("'%c' %02x (%d) (type quit to exit)\n", isprint(c) ? c : '?', (int)c,
-           (int)c);
-    printf("\r"); /* Go left edge manually, we are in raw mode. */
-    fflush(stdout);
-  }
-  disableRawMode();
-}
-
-#ifndef _WIN32
-static void WindowSizeChanged(int) {
-  // do nothing here but setting this flag
-  gotResize = true;
-}
-#endif
-
-int linenoiseInstallWindowChangeHandler(void) {
-#ifndef _WIN32
-  struct sigaction sa;
-  sigemptyset(&sa.sa_mask);
-  sa.sa_flags = 0;
-  sa.sa_handler = &WindowSizeChanged;
-
-  if (sigaction(SIGWINCH, &sa, nullptr) == -1) {
-    return errno;
-  }
-#endif
-  return 0;
-}
-
-int linenoiseKeyType(void) {
-  return keyType;
-}
diff --git a/src/linenoise/linenoise.h b/src/linenoise/linenoise.h
deleted file mode 100644
index 3a8eb9f7ee63..000000000000
--- a/src/linenoise/linenoise.h
+++ /dev/null
@@ -1,73 +0,0 @@
-/* linenoise.h -- guerrilla line editing library against the idea that a
- * line editing lib needs to be 20,000 lines of C code.
- *
- * See linenoise.c for more information.
- *
- * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   * Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *   * Neither the name of Redis nor the names of its contributors may be used
- *     to endorse or promote products derived from this software without
- *     specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef __LINENOISE_H
-#define __LINENOISE_H
-
-#define LINENOISE_VERSION "1.0.0"
-#define LINENOISE_VERSION_MAJOR 1
-#define LINENOISE_VERSION_MINOR 1
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct linenoiseCompletions linenoiseCompletions;
-
-typedef void(linenoiseCompletionCallback)(const char*, linenoiseCompletions*);
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback* fn);
-void linenoiseAddCompletion(linenoiseCompletions* lc, const char* str);
-
-char* linenoise(const char* prompt);
-void linenoisePreloadBuffer(const char* preloadText);
-int linenoiseHistoryAdd(const char* line);
-int linenoiseHistorySetMaxLen(int len);
-char* linenoiseHistoryLine(int index);
-int linenoiseHistorySave(const char* filename);
-int linenoiseHistoryLoad(const char* filename);
-void linenoiseHistoryFree(void);
-void linenoiseClearScreen(void);
-void linenoiseSetMultiLine(int ml);
-void linenoisePrintKeyCodes(void);
-/* the following are extensions to the original linenoise API */
-int linenoiseInstallWindowChangeHandler(void);
-/* returns type of key pressed: 1 = CTRL-C, 2 = CTRL-D, 0 = other */ 
-int linenoiseKeyType(void);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __LINENOISE_H */
diff --git a/src/linenoise/wcwidth.cpp b/src/linenoise/wcwidth.cpp
deleted file mode 100644
index deec0ba6b57f..000000000000
--- a/src/linenoise/wcwidth.cpp
+++ /dev/null
@@ -1,315 +0,0 @@
-/*
- * This is an implementation of wcwidth() and wcswidth() (defined in
- * IEEE Std 1002.1-2001) for Unicode.
- *
- * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
- * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
- *
- * In fixed-width output devices, Latin characters all occupy a single
- * "cell" position of equal width, whereas ideographic CJK characters
- * occupy two such cells. Interoperability between terminal-line
- * applications and (teletype-style) character terminals using the
- * UTF-8 encoding requires agreement on which character should advance
- * the cursor by how many cell positions. No established formal
- * standards exist at present on which Unicode character shall occupy
- * how many cell positions on character terminals. These routines are
- * a first attempt of defining such behavior based on simple rules
- * applied to data provided by the Unicode Consortium.
- *
- * For some graphical characters, the Unicode standard explicitly
- * defines a character-cell width via the definition of the East Asian
- * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
- * In all these cases, there is no ambiguity about which width a
- * terminal shall use. For characters in the East Asian Ambiguous (A)
- * class, the width choice depends purely on a preference of backward
- * compatibility with either historic CJK or Western practice.
- * Choosing single-width for these characters is easy to justify as
- * the appropriate long-term solution, as the CJK practice of
- * displaying these characters as double-width comes from historic
- * implementation simplicity (8-bit encoded characters were displayed
- * single-width and 16-bit ones double-width, even for Greek,
- * Cyrillic, etc.) and not any typographic considerations.
- *
- * Much less clear is the choice of width for the Not East Asian
- * (Neutral) class. Existing practice does not dictate a width for any
- * of these characters. It would nevertheless make sense
- * typographically to allocate two character cells to characters such
- * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
- * represented adequately with a single-width glyph. The following
- * routines at present merely assign a single-cell width to all
- * neutral characters, in the interest of simplicity. This is not
- * entirely satisfactory and should be reconsidered before
- * establishing a formal standard in this area. At the moment, the
- * decision which Not East Asian (Neutral) characters should be
- * represented by double-width glyphs cannot yet be answered by
- * applying a simple rule from the Unicode database content. Setting
- * up a proper standard for the behavior of UTF-8 character terminals
- * will require a careful analysis not only of each Unicode character,
- * but also of each presentation form, something the author of these
- * routines has avoided to do so far.
- *
- * http://www.unicode.org/unicode/reports/tr11/
- *
- * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
- *
- * Permission to use, copy, modify, and distribute this software
- * for any purpose and without fee is hereby granted. The author
- * disclaims all warranties with regard to this software.
- *
- * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
- */
-
-#include <wchar.h>
-#include <string>
-#include <memory>
-
-namespace linenoise_ng {
-
-struct interval {
-  char32_t first;
-  char32_t last;
-};
-
-/* auxiliary function for binary search in interval table */
-static int bisearch(char32_t ucs, const struct interval *table, int max) {
-  int min = 0;
-  int mid;
-
-  if (ucs < table[0].first || ucs > table[max].last)
-    return 0;
-  while (max >= min) {
-    mid = (min + max) / 2;
-    if (ucs > table[mid].last)
-      min = mid + 1;
-    else if (ucs < table[mid].first)
-      max = mid - 1;
-    else
-      return 1;
-  }
-
-  return 0;
-}
-
-
-/* The following two functions define the column width of an ISO 10646
- * character as follows:
- *
- *    - The null character (U+0000) has a column width of 0.
- *
- *    - Other C0/C1 control characters and DEL will lead to a return
- *      value of -1.
- *
- *    - Non-spacing and enclosing combining characters (general
- *      category code Mn or Me in the Unicode database) have a
- *      column width of 0.
- *
- *    - SOFT HYPHEN (U+00AD) has a column width of 1.
- *
- *    - Other format characters (general category code Cf in the Unicode
- *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
- *
- *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
- *      have a column width of 0.
- *
- *    - Spacing characters in the East Asian Wide (W) or East Asian
- *      Full-width (F) category as defined in Unicode Technical
- *      Report #11 have a column width of 2.
- *
- *    - All remaining characters (including all printable
- *      ISO 8859-1 and WGL4 characters, Unicode control characters,
- *      etc.) have a column width of 1.
- *
- * This implementation assumes that wchar_t characters are encoded
- * in ISO 10646.
- */
-
-int mk_wcwidth(char32_t ucs)
-{
-  /* sorted list of non-overlapping intervals of non-spacing characters */
-  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
-  static const struct interval combining[] = {
-    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
-    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
-    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
-    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
-    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
-    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
-    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
-    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
-    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
-    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
-    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
-    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
-    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
-    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
-    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
-    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
-    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
-    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
-    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
-    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
-    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
-    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
-    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
-    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
-    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
-    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
-    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
-    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
-    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
-    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
-    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
-    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
-    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
-    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
-    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
-    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
-    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
-    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
-    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
-    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
-    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
-    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
-    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
-    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
-    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
-    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
-    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
-    { 0xE0100, 0xE01EF }
-  };
-
-  /* test for 8-bit control characters */
-  if (ucs == 0)
-    return 0;
-  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
-    return -1;
-
-  /* binary search in table of non-spacing characters */
-  if (bisearch(ucs, combining,
-               sizeof(combining) / sizeof(struct interval) - 1))
-    return 0;
-
-  /* if we arrive here, ucs is not a combining or C0/C1 control character */
-
-  return 1 + 
-    (ucs >= 0x1100 &&
-     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
-      ucs == 0x2329 || ucs == 0x232a ||
-      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
-       ucs != 0x303f) ||                  /* CJK ... Yi */
-      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
-      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
-      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
-      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
-      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
-      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
-      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
-      (ucs >= 0x30000 && ucs <= 0x3fffd)));
-}
-
-
-int mk_wcswidth(const char32_t* pwcs, size_t n)
-{
-  int w, width = 0;
-
-  for (;*pwcs && n-- > 0; pwcs++)
-    if ((w = mk_wcwidth(*pwcs)) < 0)
-      return -1;
-    else
-      width += w;
-
-  return width;
-}
-
-
-/*
- * The following functions are the same as mk_wcwidth() and
- * mk_wcswidth(), except that spacing characters in the East Asian
- * Ambiguous (A) category as defined in Unicode Technical Report #11
- * have a column width of 2. This variant might be useful for users of
- * CJK legacy encodings who want to migrate to UCS without changing
- * the traditional terminal character-width behaviour. It is not
- * otherwise recommended for general use.
- */
-int mk_wcwidth_cjk(wchar_t ucs)
-{
-  /* sorted list of non-overlapping intervals of East Asian Ambiguous
-   * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
-  static const struct interval ambiguous[] = {
-    { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
-    { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
-    { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
-    { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
-    { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
-    { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
-    { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
-    { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
-    { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
-    { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
-    { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
-    { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
-    { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
-    { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
-    { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
-    { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
-    { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
-    { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
-    { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
-    { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
-    { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
-    { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
-    { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
-    { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
-    { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
-    { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
-    { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
-    { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
-    { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
-    { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
-    { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
-    { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
-    { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
-    { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
-    { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
-    { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
-    { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
-    { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
-    { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
-    { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
-    { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
-    { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
-    { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
-    { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
-    { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
-    { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
-    { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
-    { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
-    { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
-    { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
-    { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
-    { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
-  };
-
-  /* binary search in table of non-spacing characters */
-  if (bisearch(ucs, ambiguous,
-               sizeof(ambiguous) / sizeof(struct interval) - 1))
-    return 2;
-
-  return mk_wcwidth(ucs);
-}
-
-
-int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
-{
-  int w, width = 0;
-
-  for (;*pwcs && n-- > 0; pwcs++)
-    if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
-      return -1;
-    else
-      width += w;
-
-  return width;
-}
-
-}
diff --git a/src/nix/local.mk b/src/nix/local.mk
index bdcca33d2a6f..40a0e8d6bde1 100644
--- a/src/nix/local.mk
+++ b/src/nix/local.mk
@@ -4,7 +4,6 @@ nix_DIR := $(d)
 
 nix_SOURCES := \
   $(wildcard $(d)/*.cc) \
-  $(wildcard src/linenoise/*.cpp) \
   $(wildcard src/build-remote/*.cc) \
   $(wildcard src/nix-build/*.cc) \
   $(wildcard src/nix-channel/*.cc) \
@@ -18,7 +17,7 @@ nix_SOURCES := \
 
 nix_LIBS = libexpr libmain libstore libutil libformat
 
-nix_LDFLAGS = -pthread $(SODIUM_LIBS)
+nix_LDFLAGS = -pthread $(SODIUM_LIBS) $(EDITLINE_LIBS)
 
 $(foreach name, \
   nix-build nix-channel nix-collect-garbage nix-copy-closure nix-daemon nix-env nix-hash nix-instantiate nix-prefetch-url nix-shell nix-store, \
diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 77898c632360..ff8477865b5f 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -1,8 +1,12 @@
 #include <iostream>
 #include <cstdlib>
+#include <cstring>
+#include <climits>
 
 #include <setjmp.h>
 
+#include <editline.h>
+
 #include "shared.hh"
 #include "eval.hh"
 #include "eval-inline.hh"
@@ -15,8 +19,6 @@
 #include "command.hh"
 #include "finally.hh"
 
-#include "src/linenoise/linenoise.h"
-
 namespace nix {
 
 #define ESC_RED "\033[31m"
@@ -118,17 +120,71 @@ NixRepl::NixRepl(const Strings & searchPath, nix::ref<Store> store)
 
 NixRepl::~NixRepl()
 {
-    linenoiseHistorySave(historyFile.c_str());
+    write_history(historyFile.c_str());
 }
 
-
 static NixRepl * curRepl; // ugly
 
-static void completionCallback(const char * s, linenoiseCompletions *lc)
-{
-    /* Otherwise, return all symbols that start with the prefix. */
-    for (auto & c : curRepl->completePrefix(s))
-        linenoiseAddCompletion(lc, c.c_str());
+static char * completionCallback(char * s, int *match) {
+  auto possible = curRepl->completePrefix(s);
+  if (possible.size() == 1) {
+    *match = 1;
+    auto *res = strdup(possible.begin()->c_str() + strlen(s));
+    if (!res) throw Error("allocation failure");
+    return res;
+  } else if (possible.size() > 1) {
+    auto checkAllHaveSameAt = [&](size_t pos) {
+      auto &first = *possible.begin();
+      for (auto &p : possible) {
+        if (p.size() <= pos || p[pos] != first[pos])
+          return false;
+      }
+      return true;
+    };
+    size_t start = strlen(s);
+    size_t len = 0;
+    while (checkAllHaveSameAt(start + len)) ++len;
+    if (len > 0) {
+      *match = 1;
+      auto *res = strdup(std::string(*possible.begin(), start, len).c_str());
+      if (!res) throw Error("allocation failure");
+      return res;
+    }
+  }
+
+  *match = 0;
+  return nullptr;
+}
+
+static int listPossibleCallback(char *s, char ***avp) {
+  auto possible = curRepl->completePrefix(s);
+
+  if (possible.size() > (INT_MAX / sizeof(char*)))
+    throw Error("too many completions");
+
+  int ac = 0;
+  char **vp = nullptr;
+
+  auto check = [&](auto *p) {
+    if (!p) {
+      if (vp) {
+        while (--ac >= 0)
+          free(vp[ac]);
+        free(vp);
+      }
+      throw Error("allocation failure");
+    }
+    return p;
+  };
+
+  vp = check((char **)malloc(possible.size() * sizeof(char*)));
+
+  for (auto & p : possible)
+    vp[ac++] = check(strdup(p.c_str()));
+
+  *avp = vp;
+
+  return ac;
 }
 
 
@@ -143,12 +199,16 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
     reloadFiles();
     if (!loadedFiles.empty()) std::cout << std::endl;
 
+    // Allow nix-repl specific settings in .inputrc
+    rl_readline_name = "nix-repl";
     createDirs(dirOf(historyFile));
-    linenoiseHistorySetMaxLen(1000);
-    linenoiseHistoryLoad(historyFile.c_str());
-
+    el_hist_size = 1000;
+    read_history(historyFile.c_str());
+    // rl_initialize();
+    // linenoiseSetCompletionCallback(completionCallback);
     curRepl = this;
-    linenoiseSetCompletionCallback(completionCallback);
+    rl_set_complete_func(completionCallback);
+    rl_set_list_possib_func(listPossibleCallback);
 
     std::string input;
 
@@ -174,12 +234,6 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
             printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
         }
 
-        if (input.size() > 0) {
-            // Remove trailing newline before adding to history
-            input.erase(input.size() - 1);
-            linenoiseHistoryAdd(input.c_str());
-        }
-
         // We handled the current input fully, so we should clear it
         // and read brand new input.
         input.clear();
@@ -190,19 +244,10 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
 
 bool NixRepl::getLine(string & input, const std::string &prompt)
 {
-    char * s = linenoise(prompt.c_str());
+    char * s = readline(prompt.c_str());
     Finally doFree([&]() { free(s); });
-    if (!s) {
-      switch (auto type = linenoiseKeyType()) {
-        case 1: // ctrl-C
-          input = "";
-          return true;
-        case 2: // ctrl-D
-          return false;
-        default:
-          throw Error(format("Unexpected linenoise keytype: %1%") % type);
-      }
-    }
+    if (!s)
+      return false;
     input += s;
     input += '\n';
     return true;