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parse_color: support 24-bit RGB values

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Some terminals (like XTerm) allow full 24-bit RGB color
specifications using an extension to the regular ANSI color
scheme. Let's allow users to specify hex RGB colors,
enabling the all-important feature of hot pink ref
decorations:

  git log --format="%h%C(#ff69b4)%d%C(reset) %s"

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-11-20 10:25:39 -05:00
committed by Junio C Hamano
parent 695d95df19
commit 17a4be2606
4 changed files with 37 additions and 5 deletions
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29
color.c
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@@ -32,10 +32,13 @@ struct color {
COLOR_UNSPECIFIED = 0,
COLOR_NORMAL,
COLOR_ANSI, /* basic 0-7 ANSI colors */
COLOR_256
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;
};
/*
@@ -47,6 +50,16 @@ 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)
{
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 */
@@ -64,6 +77,16 @@ 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)) {
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])) {
@@ -140,6 +163,10 @@ static char *color_output(char *out, const struct color *c, char type)
case COLOR_256:
out += sprintf(out, "%c8;5;%d", type, c->value);
break;
case COLOR_RGB:
out += sprintf(out, "%c8;2;%d;%d;%d", type,
c->red, c->green, c->blue);
break;
}
return out;
}