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color: add support for 12-bit RGB colors

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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@drbeat.li>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Beat Bolli 2024-05-02 13:03:31 +02:00 committed by Junio C Hamano
parent d78d692efc
commit 7b97dfe47b
4 changed files with 24 additions and 13 deletions
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3
Documentation/config.txt
View File

@ -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).

21
color.c
View File

@ -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;
}

3
color.h
View File

@ -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);

10
t/t4026-color.sh
View File

@ -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' '
@ -146,13 +146,15 @@ 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 'wrong number of letters in RGB color' '
invalid_color "#1" &&
invalid_color "#23" &&
invalid_color "#456" &&
invalid_color "#789a" &&
invalid_color "#bcdef" &&
invalid_color "#1234567"