RGB color parsing currently supports 24-bit values in the form #RRGGBB. As in Cascading Style Sheets (CSS [1]), also allow to specify an RGB color using only three digits with #RGB. In this shortened form, each of the digits is – again, as in CSS – duplicated to convert the color to 24 bits, e.g. #f1b specifies the same color as #ff11bb. In color.h, remove the '0x' prefix in the example to match the actual syntax. [1] https://developer.mozilla.org/en-US/docs/Web/CSS/hex-color Signed-off-by: Beat Bolli <dev+git@xxxxxxxxx> --- Documentation/config.txt | 3 ++- color.c | 21 ++++++++++++++------- color.h | 3 ++- t/t4026-color.sh | 9 ++++++--- 4 files changed, 24 insertions(+), 12 deletions(-) diff --git a/Documentation/config.txt b/Documentation/config.txt index 70b448b13262..6f649c997c0f 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -316,7 +316,8 @@ terminals, this is usually not the same as setting to "white black". Colors may also be given as numbers between 0 and 255; these use ANSI 256-color mode (but note that not all terminals may support this). If your terminal supports it, you may also specify 24-bit RGB values as -hex, like `#ff0ab3`. +hex, like `#ff0ab3`, or 12-bit RGB values like `#f1b`, which is +equivalent to the 24-bit color `#ff11bb`. + The accepted attributes are `bold`, `dim`, `ul`, `blink`, `reverse`, `italic`, and `strike` (for crossed-out or "strikethrough" letters). diff --git a/color.c b/color.c index f663c06ac4ed..227a5ab2f42e 100644 --- a/color.c +++ b/color.c @@ -64,12 +64,16 @@ 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) +static int get_hex_color(const char **inp, int width, unsigned char *out) { + const char *in = *inp; unsigned int val; - val = (hexval(in[0]) << 4) | hexval(in[1]); + + assert(width == 1 || width == 2); + val = (hexval(in[0]) << 4) | hexval(in[width - 1]); if (val & ~0xff) return -1; + *inp += width; *out = val; return 0; } @@ -135,11 +139,14 @@ static int parse_color(struct color *out, const char *name, int len) 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)) { + /* Try a 24- or 12-bit RGB value prefixed with '#' */ + if ((len == 7 || len == 4) && name[0] == '#') { + int width_per_color = (len == 7) ? 2 : 1; + const char *color = name + 1; + + if (!get_hex_color(&color, width_per_color, &out->red) && + !get_hex_color(&color, width_per_color, &out->green) && + !get_hex_color(&color, width_per_color, &out->blue)) { out->type = COLOR_RGB; return 0; } diff --git a/color.h b/color.h index bb28343be210..7ed259a35bb4 100644 --- a/color.h +++ b/color.h @@ -112,7 +112,8 @@ int want_color_fd(int fd, int var); * Translate a Git color from 'value' into a string that the terminal can * interpret and store it into 'dst'. The Git color values are of the form * "foreground [background] [attr]" where fore- and background can be a color - * name ("red"), a RGB code (#0xFF0000) or a 256-color-mode from the terminal. + * name ("red"), a RGB code (#FF0000 or #F00) or a 256-color-mode from the + * terminal. */ int color_parse(const char *value, char *dst); int color_parse_mem(const char *value, int len, char *dst); diff --git a/t/t4026-color.sh b/t/t4026-color.sh index 0c39bd74a613..9a6f8a4bc5bf 100755 --- a/t/t4026-color.sh +++ b/t/t4026-color.sh @@ -96,8 +96,8 @@ test_expect_success '256 colors' ' color "254 bold 255" "[1;38;5;254;48;5;255m" ' -test_expect_success '24-bit colors' ' - color "#ff00ff black" "[38;2;255;0;255;40m" +test_expect_success 'RGB colors' ' + color "#ff00ff #0f0" "[38;2;255;0;255;48;2;0;255;0m" ' test_expect_success '"default" foreground' ' @@ -146,7 +146,10 @@ test_expect_success 'non-hex character in RGB color' ' invalid_color "#12x456" && invalid_color "#123x56" && invalid_color "#1234x6" && - invalid_color "#12345x" + invalid_color "#12345x" && + invalid_color "#x23" && + invalid_color "#1x3" && + invalid_color "#12x" ' test_expect_success 'unknown color slots are ignored (diff)' ' -- 2.44.0
