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-rw-r--r--color.c257
1 files changed, 200 insertions, 57 deletions
diff --git a/color.c b/color.c
index f672885b71..dee61557e0 100644
--- a/color.c
+++ b/color.c
@@ -26,62 +26,206 @@ const char *column_colors_ansi[] = {
/* Ignore the RESET at the end when giving the size */
const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
-static int parse_color(const char *name, int len)
+/* 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[] = {
- "normal", "black", "red", "green", "yellow",
+ "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++) {
- const char *str = color_names[i];
- if (!strncasecmp(name, str, len) && !str[len])
- return i - 1;
+ 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;
+ }
}
- i = strtol(name, &end, 10);
- if (end - name == len && i >= -1 && i <= 255)
- return i;
- return -2;
+
+ return -1;
}
-static int parse_attr(const char *name, int len)
+static int parse_attr(const char *name, size_t len)
{
- static const int attr_values[] = { 1, 2, 4, 5, 7 };
- static const char * const attr_names[] = {
- "bold", "dim", "ul", "blink", "reverse"
+ 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;
- for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
- const char *str = attr_names[i];
- if (!strncasecmp(name, str, len) && !str[len])
- return attr_values[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;
}
-void color_parse(const char *value, const char *var, char *dst)
+int color_parse(const char *value, char *dst)
+{
+ return color_parse_mem(value, strlen(value), dst);
+}
+
+void color_set(char *dst, const char *color_bytes)
{
- color_parse_mem(value, strlen(value), var, dst);
+ xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
+}
+
+/*
+ * 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)
+ die("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;
}
-void color_parse_mem(const char *value, int value_len, const char *var,
- char *dst)
+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;
- int fg = -2;
- int bg = -2;
+ struct color fg = { COLOR_UNSPECIFIED };
+ struct color bg = { COLOR_UNSPECIFIED };
- if (!strncasecmp(value, "reset", len)) {
- strcpy(dst, GIT_COLOR_RESET);
- return;
+ 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])) {
@@ -95,14 +239,13 @@ void color_parse_mem(const char *value, int value_len, const char *var,
len--;
}
- val = parse_color(word, wordlen);
- if (val >= -1) {
- if (fg == -2) {
- fg = val;
+ if (!parse_color(&c, word, wordlen)) {
+ if (fg.type == COLOR_UNSPECIFIED) {
+ fg = c;
continue;
}
- if (bg == -2) {
- bg = val;
+ if (bg.type == COLOR_UNSPECIFIED) {
+ bg = c;
continue;
}
goto bad;
@@ -114,12 +257,19 @@ void color_parse_mem(const char *value, int value_len, const char *var,
goto bad;
}
- if (attr || fg >= 0 || bg >= 0) {
+#undef OUT
+#define OUT(x) do { \
+ if (dst == end) \
+ die("BUG: color parsing ran out of space"); \
+ *dst++ = (x); \
+} while(0)
+
+ if (attr || !color_empty(&fg) || !color_empty(&bg)) {
int sep = 0;
int i;
- *dst++ = '\033';
- *dst++ = '[';
+ OUT('\033');
+ OUT('[');
for (i = 0; attr; i++) {
unsigned bit = (1 << i);
@@ -127,35 +277,28 @@ void color_parse_mem(const char *value, int value_len, const char *var,
continue;
attr &= ~bit;
if (sep++)
- *dst++ = ';';
- *dst++ = '0' + i;
+ OUT(';');
+ dst += xsnprintf(dst, end - dst, "%d", i);
}
- if (fg >= 0) {
+ if (!color_empty(&fg)) {
if (sep++)
- *dst++ = ';';
- if (fg < 8) {
- *dst++ = '3';
- *dst++ = '0' + fg;
- } else {
- dst += sprintf(dst, "38;5;%d", fg);
- }
+ OUT(';');
+ /* foreground colors are all in the 3x range */
+ dst = color_output(dst, end - dst, &fg, '3');
}
- if (bg >= 0) {
+ if (!color_empty(&bg)) {
if (sep++)
- *dst++ = ';';
- if (bg < 8) {
- *dst++ = '4';
- *dst++ = '0' + bg;
- } else {
- dst += sprintf(dst, "48;5;%d", bg);
- }
+ OUT(';');
+ /* background colors are all in the 4x range */
+ dst = color_output(dst, end - dst, &bg, '4');
}
- *dst++ = 'm';
+ OUT('m');
}
- *dst = 0;
- return;
+ OUT(0);
+ return 0;
bad:
- die("bad color value '%.*s' for variable '%s'", value_len, value, var);
+ return error(_("invalid color value: %.*s"), value_len, value);
+#undef OUT
}
int git_config_colorbool(const char *var, const char *value)
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-29 09:48:49 +0000