diff options
Diffstat (limited to 'color.c')
| -rw-r--r-- | color.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/color.c b/color.c new file mode 100644 index 000000000000..ebb222ec3323 --- /dev/null +++ b/color.c @@ -0,0 +1,425 @@ +#include "cache.h" +#include "config.h" +#include "color.h" + +static int git_use_color_default = GIT_COLOR_AUTO; +int color_stdout_is_tty = -1; + +/* + * The list of available column colors. + */ +const char *column_colors_ansi[] = { + GIT_COLOR_RED, + GIT_COLOR_GREEN, + GIT_COLOR_YELLOW, + GIT_COLOR_BLUE, + GIT_COLOR_MAGENTA, + GIT_COLOR_CYAN, + GIT_COLOR_BOLD_RED, + GIT_COLOR_BOLD_GREEN, + GIT_COLOR_BOLD_YELLOW, + GIT_COLOR_BOLD_BLUE, + GIT_COLOR_BOLD_MAGENTA, + GIT_COLOR_BOLD_CYAN, + GIT_COLOR_RESET, +}; + +/* Ignore the RESET at the end when giving the size */ +const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1; + +/* An individual foreground or background color. */ +struct color { + enum { + COLOR_UNSPECIFIED = 0, + COLOR_NORMAL, + COLOR_ANSI, /* basic 0-7 ANSI colors */ + COLOR_256, + COLOR_RGB + } type; + /* The numeric value for ANSI and 256-color modes */ + unsigned char value; + /* 24-bit RGB color values */ + unsigned char red, green, blue; +}; + +/* + * "word" is a buffer of length "len"; does it match the NUL-terminated + * "match" exactly? + */ +static int match_word(const char *word, int len, const char *match) +{ + return !strncasecmp(word, match, len) && !match[len]; +} + +static int get_hex_color(const char *in, unsigned char *out) +{ + unsigned int val; + val = (hexval(in[0]) << 4) | hexval(in[1]); + if (val & ~0xff) + return -1; + *out = val; + return 0; +} + +static int parse_color(struct color *out, const char *name, int len) +{ + /* Positions in array must match ANSI color codes */ + static const char * const color_names[] = { + "black", "red", "green", "yellow", + "blue", "magenta", "cyan", "white" + }; + char *end; + int i; + long val; + + /* First try the special word "normal"... */ + if (match_word(name, len, "normal")) { + out->type = COLOR_NORMAL; + return 0; + } + + /* Try a 24-bit RGB value */ + if (len == 7 && name[0] == '#') { + if (!get_hex_color(name + 1, &out->red) && + !get_hex_color(name + 3, &out->green) && + !get_hex_color(name + 5, &out->blue)) { + out->type = COLOR_RGB; + return 0; + } + } + + /* Then pick from our human-readable color names... */ + for (i = 0; i < ARRAY_SIZE(color_names); i++) { + if (match_word(name, len, color_names[i])) { + out->type = COLOR_ANSI; + out->value = i; + return 0; + } + } + + /* And finally try a literal 256-color-mode number */ + val = strtol(name, &end, 10); + if (end - name == len) { + /* + * Allow "-1" as an alias for "normal", but other negative + * numbers are bogus. + */ + if (val < -1) + ; /* fall through to error */ + else if (val < 0) { + out->type = COLOR_NORMAL; + return 0; + /* Rewrite low numbers as more-portable standard colors. */ + } else if (val < 8) { + out->type = COLOR_ANSI; + out->value = val; + return 0; + } else if (val < 256) { + out->type = COLOR_256; + out->value = val; + return 0; + } + } + + return -1; +} + +static int parse_attr(const char *name, size_t len) +{ + static const struct { + const char *name; + size_t len; + int val, neg; + } attrs[] = { +#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) } + ATTR("bold", 1, 22), + ATTR("dim", 2, 22), + ATTR("italic", 3, 23), + ATTR("ul", 4, 24), + ATTR("blink", 5, 25), + ATTR("reverse", 7, 27), + ATTR("strike", 9, 29) +#undef ATTR + }; + int negate = 0; + int i; + + if (skip_prefix_mem(name, len, "no", &name, &len)) { + skip_prefix_mem(name, len, "-", &name, &len); + negate = 1; + } + + for (i = 0; i < ARRAY_SIZE(attrs); i++) { + if (attrs[i].len == len && !memcmp(attrs[i].name, name, len)) + return negate ? attrs[i].neg : attrs[i].val; + } + return -1; +} + +int color_parse(const char *value, char *dst) +{ + return color_parse_mem(value, strlen(value), dst); +} + +/* + * Write the ANSI color codes for "c" to "out"; the string should + * already have the ANSI escape code in it. "out" should have enough + * space in it to fit any color. + */ +static char *color_output(char *out, int len, const struct color *c, char type) +{ + switch (c->type) { + case COLOR_UNSPECIFIED: + case COLOR_NORMAL: + break; + case COLOR_ANSI: + if (len < 2) + BUG("color parsing ran out of space"); + *out++ = type; + *out++ = '0' + c->value; + break; + case COLOR_256: + out += xsnprintf(out, len, "%c8;5;%d", type, c->value); + break; + case COLOR_RGB: + out += xsnprintf(out, len, "%c8;2;%d;%d;%d", type, + c->red, c->green, c->blue); + break; + } + return out; +} + +static int color_empty(const struct color *c) +{ + return c->type <= COLOR_NORMAL; +} + +int color_parse_mem(const char *value, int value_len, char *dst) +{ + const char *ptr = value; + int len = value_len; + char *end = dst + COLOR_MAXLEN; + unsigned int attr = 0; + struct color fg = { COLOR_UNSPECIFIED }; + struct color bg = { COLOR_UNSPECIFIED }; + + while (len > 0 && isspace(*ptr)) { + ptr++; + len--; + } + + if (!len) { + dst[0] = '\0'; + return 0; + } + + if (!strncasecmp(ptr, "reset", len)) { + xsnprintf(dst, end - dst, GIT_COLOR_RESET); + return 0; + } + + /* [fg [bg]] [attr]... */ + while (len > 0) { + const char *word = ptr; + struct color c = { COLOR_UNSPECIFIED }; + int val, wordlen = 0; + + while (len > 0 && !isspace(word[wordlen])) { + wordlen++; + len--; + } + + ptr = word + wordlen; + while (len > 0 && isspace(*ptr)) { + ptr++; + len--; + } + + if (!parse_color(&c, word, wordlen)) { + if (fg.type == COLOR_UNSPECIFIED) { + fg = c; + continue; + } + if (bg.type == COLOR_UNSPECIFIED) { + bg = c; + continue; + } + goto bad; + } + val = parse_attr(word, wordlen); + if (0 <= val) + attr |= (1 << val); + else + goto bad; + } + +#undef OUT +#define OUT(x) do { \ + if (dst == end) \ + BUG("color parsing ran out of space"); \ + *dst++ = (x); \ +} while(0) + + if (attr || !color_empty(&fg) || !color_empty(&bg)) { + int sep = 0; + int i; + + OUT('\033'); + OUT('['); + + for (i = 0; attr; i++) { + unsigned bit = (1 << i); + if (!(attr & bit)) + continue; + attr &= ~bit; + if (sep++) + OUT(';'); + dst += xsnprintf(dst, end - dst, "%d", i); + } + if (!color_empty(&fg)) { + if (sep++) + OUT(';'); + /* foreground colors are all in the 3x range */ + dst = color_output(dst, end - dst, &fg, '3'); + } + if (!color_empty(&bg)) { + if (sep++) + OUT(';'); + /* background colors are all in the 4x range */ + dst = color_output(dst, end - dst, &bg, '4'); + } + OUT('m'); + } + OUT(0); + return 0; +bad: + return error(_("invalid color value: %.*s"), value_len, value); +#undef OUT +} + +int git_config_colorbool(const char *var, const char *value) +{ + if (value) { + if (!strcasecmp(value, "never")) + return 0; + if (!strcasecmp(value, "always")) + return 1; + if (!strcasecmp(value, "auto")) + return GIT_COLOR_AUTO; + } + + if (!var) + return -1; + + /* Missing or explicit false to turn off colorization */ + if (!git_config_bool(var, value)) + return 0; + + /* any normal truth value defaults to 'auto' */ + return GIT_COLOR_AUTO; +} + +static int check_auto_color(int fd) +{ + static int color_stderr_is_tty = -1; + int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty; + if (*is_tty_p < 0) + *is_tty_p = isatty(fd); + if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) { + if (!is_terminal_dumb()) + return 1; + } + return 0; +} + +int want_color_fd(int fd, int var) +{ + /* + * NEEDSWORK: This function is sometimes used from multiple threads, and + * we end up using want_auto racily. That "should not matter" since + * we always write the same value, but it's still wrong. This function + * is listed in .tsan-suppressions for the time being. + */ + + static int want_auto[3] = { -1, -1, -1 }; + + if (fd < 1 || fd >= ARRAY_SIZE(want_auto)) + BUG("file descriptor out of range: %d", fd); + + if (var < 0) + var = git_use_color_default; + + if (var == GIT_COLOR_AUTO) { + if (want_auto[fd] < 0) + want_auto[fd] = check_auto_color(fd); + return want_auto[fd]; + } + return var; +} + +int git_color_config(const char *var, const char *value, void *cb) +{ + if (!strcmp(var, "color.ui")) { + git_use_color_default = git_config_colorbool(var, value); + return 0; + } + + return 0; +} + +int git_color_default_config(const char *var, const char *value, void *cb) +{ + if (git_color_config(var, value, cb) < 0) + return -1; + + return git_default_config(var, value, cb); +} + +void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb) +{ + if (*color) + fprintf(fp, "%s", color); + fprintf(fp, "%s", sb->buf); + if (*color) + fprintf(fp, "%s", GIT_COLOR_RESET); +} + +static int color_vfprintf(FILE *fp, const char *color, const char *fmt, + va_list args, const char *trail) +{ + int r = 0; + + if (*color) + r += fprintf(fp, "%s", color); + r += vfprintf(fp, fmt, args); + if (*color) + r += fprintf(fp, "%s", GIT_COLOR_RESET); + if (trail) + r += fprintf(fp, "%s", trail); + return r; +} + +int color_fprintf(FILE *fp, const char *color, const char *fmt, ...) +{ + va_list args; + int r; + va_start(args, fmt); + r = color_vfprintf(fp, color, fmt, args, NULL); + va_end(args); + return r; +} + +int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...) +{ + va_list args; + int r; + va_start(args, fmt); + r = color_vfprintf(fp, color, fmt, args, "\n"); + va_end(args); + return r; +} + +int color_is_nil(const char *c) +{ + return !strcmp(c, "NIL"); +} |