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+;;; f.el --- Modern API for working with files and directories -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2013 Johan Andersson
+
+;; Author: Johan Andersson <johan.rejeep@gmail.com>
+;; Maintainer: Johan Andersson <johan.rejeep@gmail.com>
+;; Version: 0.20.0
+;; Package-Version: 20180106.122
+;; Keywords: files, directories
+;; URL: http://github.com/rejeep/f.el
+;; Package-Requires: ((s "1.7.0") (dash "2.2.0"))
+
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Code:
+
+
+
+(require 's)
+(require 'dash)
+
+(put 'f-guard-error 'error-conditions '(error f-guard-error))
+(put 'f-guard-error 'error-message "Destructive operation outside sandbox")
+
+(defvar f--guard-paths nil
+  "List of allowed paths to modify when guarded.
+
+Do not modify this variable.")
+
+(defmacro f--destructive (path &rest body)
+  "If PATH is allowed to be modified, yield BODY.
+
+If PATH is not allowed to be modified, throw error."
+  (declare (indent 1))
+  `(if f--guard-paths
+       (if (--any? (or (f-same? it ,path)
+                       (f-ancestor-of? it ,path)) f--guard-paths)
+           (progn ,@body)
+         (signal 'f-guard-error (list ,path f--guard-paths)))
+     ,@body))
+
+
+;;;; Paths
+
+(defun f-join (&rest args)
+  "Join ARGS to a single path."
+  (let (path (relative (f-relative? (car args))))
+    (-map
+     (lambda (arg)
+       (setq path (f-expand arg path)))
+     args)
+    (if relative (f-relative path) path)))
+
+(defun f-split (path)
+  "Split PATH and return list containing parts."
+  (let ((parts (s-split (f-path-separator) path 'omit-nulls)))
+    (if (f-absolute? path)
+        (push (f-path-separator) parts)
+      parts)))
+
+(defun f-expand (path &optional dir)
+  "Expand PATH relative to DIR (or `default-directory').
+PATH and DIR can be either a directory names or directory file
+names.  Return a directory name if PATH is a directory name, and
+a directory file name otherwise.  File name handlers are
+ignored."
+  (let (file-name-handler-alist)
+    (expand-file-name path dir)))
+
+(defun f-filename (path)
+  "Return the name of PATH."
+  (file-name-nondirectory (directory-file-name path)))
+
+(defalias 'f-parent 'f-dirname)
+(defun f-dirname (path)
+  "Return the parent directory to PATH."
+  (let ((parent (file-name-directory
+                 (directory-file-name (f-expand path default-directory)))))
+    (unless (f-same? path parent)
+      (if (f-relative? path)
+          (f-relative parent)
+        (directory-file-name parent)))))
+
+(defun f-common-parent (paths)
+  "Return the deepest common parent directory of PATHS."
+  (cond
+   ((not paths) nil)
+   ((not (cdr paths)) (f-parent (car paths)))
+   (:otherwise
+    (let* ((paths (-map 'f-split paths))
+           (common (caar paths))
+           (re nil))
+      (while (and (not (null (car paths))) (--all? (equal (car it) common) paths))
+        (setq paths (-map 'cdr paths))
+        (push common re)
+        (setq common (caar paths)))
+      (cond
+       ((null re) "")
+       ((and (= (length re) 1) (f-root? (car re)))
+        (f-root))
+       (:otherwise
+        (concat (apply 'f-join (nreverse re)) "/")))))))
+
+(defun f-ext (path)
+  "Return the file extension of PATH.
+
+The extension, in a file name, is the part that follows the last
+'.', excluding version numbers and backup suffixes."
+  (file-name-extension path))
+
+(defun f-no-ext (path)
+  "Return everything but the file extension of PATH."
+  (file-name-sans-extension path))
+
+(defun f-swap-ext (path ext)
+  "Return PATH but with EXT as the new extension.
+EXT must not be nil or empty."
+  (if (s-blank? ext)
+      (error "Extension cannot be empty or nil")
+    (concat (f-no-ext path) "." ext)))
+
+(defun f-base (path)
+  "Return the name of PATH, excluding the extension of file."
+  (f-no-ext (f-filename path)))
+
+(defun f-relative (path &optional dir)
+  "Return PATH relative to DIR."
+  (file-relative-name path dir))
+
+(defalias 'f-abbrev 'f-short)
+(defun f-short (path)
+  "Return abbrev of PATH.  See `abbreviate-file-name'."
+  (abbreviate-file-name path))
+
+(defun f-long (path)
+  "Return long version of PATH."
+  (f-expand path))
+
+(defun f-canonical (path)
+  "Return the canonical name of PATH."
+  (file-truename path))
+
+(defun f-slash (path)
+  "Append slash to PATH unless one already.
+
+Some functions, such as `call-process' requires there to be an
+ending slash."
+  (if (f-dir? path)
+      (file-name-as-directory path)
+    path))
+
+(defun f-full (path)
+  "Return absolute path to PATH, with ending slash."
+  (f-slash (f-long path)))
+
+(defun f--uniquify (paths)
+  "Helper for `f-uniquify' and `f-uniquify-alist'."
+  (let* ((files-length (length paths))
+         (uniq-filenames (--map (cons it (f-filename it)) paths))
+         (uniq-filenames-next (-group-by 'cdr uniq-filenames)))
+    (while (/= files-length (length uniq-filenames-next))
+      (setq uniq-filenames-next
+            (-group-by 'cdr
+                       (--mapcat
+                        (let ((conf-files (cdr it)))
+                          (if (> (length conf-files) 1)
+                              (--map (cons (car it) (concat (f-filename (s-chop-suffix (cdr it) (car it))) (f-path-separator) (cdr it))) conf-files)
+                            conf-files))
+                        uniq-filenames-next))))
+    uniq-filenames-next))
+
+(defun f-uniquify (files)
+  "Return unique suffixes of FILES.
+
+This function expects no duplicate paths."
+  (-map 'car (f--uniquify files)))
+
+(defun f-uniquify-alist (files)
+  "Return alist mapping FILES to unique suffixes of FILES.
+
+This function expects no duplicate paths."
+  (-map 'cadr (f--uniquify files)))
+
+
+;;;; I/O
+
+(defun f-read-bytes (path)
+  "Read binary data from PATH.
+
+Return the binary data as unibyte string."
+  (with-temp-buffer
+    (set-buffer-multibyte nil)
+    (setq buffer-file-coding-system 'binary)
+    (insert-file-contents-literally path)
+    (buffer-substring-no-properties (point-min) (point-max))))
+
+(defalias 'f-read 'f-read-text)
+(defun f-read-text (path &optional coding)
+  "Read text with PATH, using CODING.
+
+CODING defaults to `utf-8'.
+
+Return the decoded text as multibyte string."
+  (decode-coding-string (f-read-bytes path) (or coding 'utf-8)))
+
+(defalias 'f-write 'f-write-text)
+(defun f-write-text (text coding path)
+  "Write TEXT with CODING to PATH.
+
+TEXT is a multibyte string.  CODING is a coding system to encode
+TEXT with.  PATH is a file name to write to."
+  (f-write-bytes (encode-coding-string text coding) path))
+
+(defun f-unibyte-string-p (s)
+  "Determine whether S is a unibyte string."
+  (not (multibyte-string-p s)))
+
+(defun f-write-bytes (data path)
+  "Write binary DATA to PATH.
+
+DATA is a unibyte string.  PATH is a file name to write to."
+  (f--destructive path
+    (unless (f-unibyte-string-p data)
+      (signal 'wrong-type-argument (list 'f-unibyte-string-p data)))
+    (let ((file-coding-system-alist nil)
+          (coding-system-for-write 'binary))
+      (with-temp-file path
+        (setq buffer-file-coding-system 'binary)
+        (set-buffer-multibyte nil)
+        (insert data)))))
+
+(defalias 'f-append 'f-append-text)
+(defun f-append-text (text coding path)
+  "Append TEXT with CODING to PATH.
+
+If PATH does not exist, it is created."
+  (f-append-bytes (encode-coding-string text coding) path))
+
+(defun f-append-bytes (data path)
+  "Append binary DATA to PATH.
+
+If PATH does not exist, it is created."
+  (let ((content
+         (if (f-file? path)
+             (f-read-bytes path)
+           "")))
+    (f-write-bytes (concat content data) path)))
+
+
+;;;; Destructive
+
+(defun f-mkdir (&rest dirs)
+  "Create directories DIRS."
+  (let (path)
+    (-each
+        dirs
+      (lambda (dir)
+        (setq path (f-expand dir path))
+        (unless (f-directory? path)
+          (f--destructive path (make-directory path)))))))
+
+(defun f-delete (path &optional force)
+  "Delete PATH, which can be file or directory.
+
+If FORCE is t, a directory will be deleted recursively."
+  (f--destructive path
+    (if (or (f-file? path) (f-symlink? path))
+        (delete-file path)
+      (delete-directory path force))))
+
+(defun f-symlink (source path)
+  "Create a symlink to SOURCE from PATH."
+  (f--destructive path (make-symbolic-link source path)))
+
+(defun f-move (from to)
+  "Move or rename FROM to TO.
+If TO is a directory name, move FROM into TO."
+  (f--destructive to (rename-file from to t)))
+
+(defun f-copy (from to)
+  "Copy file or directory FROM to TO.
+If FROM names a directory and TO is a directory name, copy FROM
+into TO as a subdirectory."
+  (f--destructive to
+    (if (f-file? from)
+        (copy-file from to)
+      ;; The behavior of `copy-directory' differs between Emacs 23 and
+      ;; 24 in that in Emacs 23, the contents of `from' is copied to
+      ;; `to', while in Emacs 24 the directory `from' is copied to
+      ;; `to'. We want the Emacs 24 behavior.
+      (if (> emacs-major-version 23)
+          (copy-directory from to)
+        (if (f-dir? to)
+            (progn
+              (apply 'f-mkdir (f-split to))
+              (let ((new-to (f-expand (f-filename from) to)))
+                (copy-directory from new-to)))
+          (copy-directory from to))))))
+
+(defun f-copy-contents (from to)
+  "Copy contents in directory FROM, to directory TO."
+  (unless (f-exists? to)
+    (error "Cannot copy contents to non existing directory %s" to))
+  (unless (f-dir? from)
+    (error "Cannot copy contents as %s is a file" from))
+  (--each (f-entries from)
+    (f-copy it (file-name-as-directory to))))
+
+(defun f-touch (path)
+  "Update PATH last modification date or create if it does not exist."
+  (f--destructive path
+    (if (f-file? path)
+        (set-file-times path)
+      (f-write-bytes "" path))))
+
+
+;;;; Predicates
+
+(defun f-exists? (path)
+  "Return t if PATH exists, false otherwise."
+  (file-exists-p path))
+
+(defalias 'f-exists-p 'f-exists?)
+
+(defalias 'f-dir? 'f-directory?)
+(defalias 'f-dir-p 'f-dir?)
+
+(defun f-directory? (path)
+  "Return t if PATH is directory, false otherwise."
+  (file-directory-p path))
+
+(defalias 'f-directory-p 'f-directory?)
+
+(defun f-file? (path)
+  "Return t if PATH is file, false otherwise."
+  (file-regular-p path))
+
+(defalias 'f-file-p 'f-file?)
+
+(defun f-symlink? (path)
+  "Return t if PATH is symlink, false otherwise."
+  (not (not (file-symlink-p path))))
+
+(defalias 'f-symlink-p 'f-symlink?)
+
+(defun f-readable? (path)
+  "Return t if PATH is readable, false otherwise."
+  (file-readable-p path))
+
+(defalias 'f-readable-p 'f-readable?)
+
+(defun f-writable? (path)
+  "Return t if PATH is writable, false otherwise."
+  (file-writable-p path))
+
+(defalias 'f-writable-p 'f-writable?)
+
+(defun f-executable? (path)
+  "Return t if PATH is executable, false otherwise."
+  (file-executable-p path))
+
+(defalias 'f-executable-p 'f-executable?)
+
+(defun f-absolute? (path)
+  "Return t if PATH is absolute, false otherwise."
+  (file-name-absolute-p path))
+
+(defalias 'f-absolute-p 'f-absolute?)
+
+(defun f-relative? (path)
+  "Return t if PATH is relative, false otherwise."
+  (not (f-absolute? path)))
+
+(defalias 'f-relative-p 'f-relative?)
+
+(defun f-root? (path)
+  "Return t if PATH is root directory, false otherwise."
+  (not (f-parent path)))
+
+(defalias 'f-root-p 'f-root?)
+
+(defun f-ext? (path &optional ext)
+  "Return t if extension of PATH is EXT, false otherwise.
+
+If EXT is nil or omitted, return t if PATH has any extension,
+false otherwise.
+
+The extension, in a file name, is the part that follows the last
+'.', excluding version numbers and backup suffixes."
+  (if ext
+      (string= (f-ext path) ext)
+    (not (eq (f-ext path) nil))))
+
+(defalias 'f-ext-p 'f-ext?)
+
+(defalias 'f-equal? 'f-same?)
+(defalias 'f-equal-p 'f-equal?)
+
+(defun f-same? (path-a path-b)
+  "Return t if PATH-A and PATH-B are references to same file."
+  (when (and (f-exists? path-a)
+             (f-exists? path-b))
+    (equal
+     (f-canonical (directory-file-name (f-expand path-a)))
+     (f-canonical (directory-file-name (f-expand path-b))))))
+
+(defalias 'f-same-p 'f-same?)
+
+(defun f-parent-of? (path-a path-b)
+  "Return t if PATH-A is parent of PATH-B."
+  (--when-let (f-parent path-b)
+    (f-same? path-a it)))
+
+(defalias 'f-parent-of-p 'f-parent-of?)
+
+(defun f-child-of? (path-a path-b)
+  "Return t if PATH-A is child of PATH-B."
+  (--when-let (f-parent path-a)
+    (f-same? it path-b)))
+
+(defalias 'f-child-of-p 'f-child-of?)
+
+(defun f-ancestor-of? (path-a path-b)
+  "Return t if PATH-A is ancestor of PATH-B."
+  (unless (f-same? path-a path-b)
+    (s-starts-with? (f-full path-a)
+                    (f-full path-b))))
+
+(defalias 'f-ancestor-of-p 'f-ancestor-of?)
+
+(defun f-descendant-of? (path-a path-b)
+  "Return t if PATH-A is desendant of PATH-B."
+  (unless (f-same? path-a path-b)
+    (s-starts-with? (f-full path-b)
+                    (f-full path-a))))
+
+(defalias 'f-descendant-of-p 'f-descendant-of?)
+
+(defun f-hidden? (path)
+  "Return t if PATH is hidden, nil otherwise."
+  (unless (f-exists? path)
+    (error "Path does not exist: %s" path))
+  (string= (substring path 0 1) "."))
+
+(defalias 'f-hidden-p 'f-hidden?)
+
+(defun f-empty? (path)
+  "If PATH is a file, return t if the file in PATH is empty, nil otherwise.
+If PATH is directory, return t if directory has no files, nil otherwise."
+  (if (f-directory? path)
+      (equal (f-files path nil t) nil)
+    (= (f-size path) 0)))
+
+(defalias 'f-empty-p 'f-empty?)
+
+
+;;;; Stats
+
+(defun f-size (path)
+  "Return size of PATH.
+
+If PATH is a file, return size of that file.  If PATH is
+directory, return sum of all files in PATH."
+  (if (f-directory? path)
+      (-sum (-map 'f-size (f-files path nil t)))
+    (nth 7 (file-attributes path))))
+
+(defun f-depth (path)
+  "Return the depth of PATH.
+
+At first, PATH is expanded with `f-expand'.  Then the full path is used to
+detect the depth.
+'/' will be zero depth,  '/usr' will be one depth.  And so on."
+  (- (length (f-split (f-expand path))) 1))
+
+
+;;;; Misc
+
+(defun f-this-file ()
+  "Return path to this file."
+  (cond
+   (load-in-progress load-file-name)
+   ((and (boundp 'byte-compile-current-file) byte-compile-current-file)
+    byte-compile-current-file)
+   (:else (buffer-file-name))))
+
+(defvar f--path-separator nil
+  "A variable to cache result of `f-path-separator'.")
+
+(defun f-path-separator ()
+  "Return path separator."
+  (or f--path-separator
+      (setq f--path-separator (substring (f-join "x" "y") 1 2))))
+
+(defun f-glob (pattern &optional path)
+  "Find PATTERN in PATH."
+  (file-expand-wildcards
+   (f-join (or path default-directory) pattern)))
+
+(defun f--collect-entries (path recursive)
+  (let (result
+        (entries
+         (-reject
+          (lambda (file)
+            (or
+             (equal (f-filename file) ".")
+             (equal (f-filename file) "..")))
+          (directory-files path t))))
+    (cond (recursive
+           (-map
+            (lambda (entry)
+              (if (f-file? entry)
+                  (setq result (cons entry result))
+                (when (f-directory? entry)
+                  (setq result (cons entry result))
+                  (setq result (append result (f--collect-entries entry recursive))))))
+            entries))
+          (t (setq result entries)))
+    result))
+
+(defmacro f--entries (path body &optional recursive)
+  "Anaphoric version of `f-entries'."
+  `(f-entries
+    ,path
+    (lambda (path)
+      (let ((it path))
+        ,body))
+    ,recursive))
+
+(defun f-entries (path &optional fn recursive)
+  "Find all files and directories in PATH.
+
+FN - called for each found file and directory.  If FN returns a thruthy
+value, file or directory will be included.
+RECURSIVE - Search for files and directories recursive."
+  (let ((entries (f--collect-entries path recursive)))
+    (if fn (-select fn entries) entries)))
+
+(defmacro f--directories (path body &optional recursive)
+  "Anaphoric version of `f-directories'."
+  `(f-directories
+    ,path
+    (lambda (path)
+      (let ((it path))
+        ,body))
+    ,recursive))
+
+(defun f-directories (path &optional fn recursive)
+  "Find all directories in PATH.  See `f-entries'."
+  (let ((directories (-select 'f-directory? (f--collect-entries path recursive))))
+    (if fn (-select fn directories) directories)))
+
+(defmacro f--files (path body &optional recursive)
+  "Anaphoric version of `f-files'."
+  `(f-files
+    ,path
+    (lambda (path)
+      (let ((it path))
+        ,body))
+    ,recursive))
+
+(defun f-files (path &optional fn recursive)
+  "Find all files in PATH.  See `f-entries'."
+  (let ((files (-select 'f-file? (f--collect-entries path recursive))))
+    (if fn (-select fn files) files)))
+
+(defmacro f--traverse-upwards (body &optional path)
+  "Anaphoric version of `f-traverse-upwards'."
+  `(f-traverse-upwards
+    (lambda (dir)
+      (let ((it dir))
+        ,body))
+    ,path))
+
+(defun f-traverse-upwards (fn &optional path)
+  "Traverse up as long as FN return nil, starting at PATH.
+
+If FN returns a non-nil value, the path sent as argument to FN is
+returned.  If no function callback return a non-nil value, nil is
+returned."
+  (unless path
+    (setq path default-directory))
+  (when (f-relative? path)
+    (setq path (f-expand path)))
+  (if (funcall fn path)
+      path
+    (unless (f-root? path)
+      (f-traverse-upwards fn (f-parent path)))))
+
+(defun f-root ()
+  "Return absolute root."
+  (f-traverse-upwards 'f-root?))
+
+(defmacro f-with-sandbox (path-or-paths &rest body)
+  "Only allow PATH-OR-PATHS and decendants to be modified in BODY."
+  (declare (indent 1))
+  `(let ((paths (if (listp ,path-or-paths)
+                    ,path-or-paths
+                  (list ,path-or-paths))))
+     (unwind-protect
+         (let ((f--guard-paths paths))
+           ,@body)
+       (setq f--guard-paths nil))))
+
+(provide 'f)
+
+;;; f.el ends here