rebase --root: fix amending root commit messages
[git.git] / color.c
blobf277e72e4ce04815f71c949dfdf7c89c9462c5b7
1 #include "cache.h"
2 #include "config.h"
3 #include "color.h"
5 static int git_use_color_default = GIT_COLOR_AUTO;
6 int color_stdout_is_tty = -1;
8 /*
9 * The list of available column colors.
11 const char *column_colors_ansi[] = {
12 GIT_COLOR_RED,
13 GIT_COLOR_GREEN,
14 GIT_COLOR_YELLOW,
15 GIT_COLOR_BLUE,
16 GIT_COLOR_MAGENTA,
17 GIT_COLOR_CYAN,
18 GIT_COLOR_BOLD_RED,
19 GIT_COLOR_BOLD_GREEN,
20 GIT_COLOR_BOLD_YELLOW,
21 GIT_COLOR_BOLD_BLUE,
22 GIT_COLOR_BOLD_MAGENTA,
23 GIT_COLOR_BOLD_CYAN,
24 GIT_COLOR_RESET,
27 /* Ignore the RESET at the end when giving the size */
28 const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
30 /* An individual foreground or background color. */
31 struct color {
32 enum {
33 COLOR_UNSPECIFIED = 0,
34 COLOR_NORMAL,
35 COLOR_ANSI, /* basic 0-7 ANSI colors */
36 COLOR_256,
37 COLOR_RGB
38 } type;
39 /* The numeric value for ANSI and 256-color modes */
40 unsigned char value;
41 /* 24-bit RGB color values */
42 unsigned char red, green, blue;
46 * "word" is a buffer of length "len"; does it match the NUL-terminated
47 * "match" exactly?
49 static int match_word(const char *word, int len, const char *match)
51 return !strncasecmp(word, match, len) && !match[len];
54 static int get_hex_color(const char *in, unsigned char *out)
56 unsigned int val;
57 val = (hexval(in[0]) << 4) | hexval(in[1]);
58 if (val & ~0xff)
59 return -1;
60 *out = val;
61 return 0;
64 static int parse_color(struct color *out, const char *name, int len)
66 /* Positions in array must match ANSI color codes */
67 static const char * const color_names[] = {
68 "black", "red", "green", "yellow",
69 "blue", "magenta", "cyan", "white"
71 char *end;
72 int i;
73 long val;
75 /* First try the special word "normal"... */
76 if (match_word(name, len, "normal")) {
77 out->type = COLOR_NORMAL;
78 return 0;
81 /* Try a 24-bit RGB value */
82 if (len == 7 && name[0] == '#') {
83 if (!get_hex_color(name + 1, &out->red) &&
84 !get_hex_color(name + 3, &out->green) &&
85 !get_hex_color(name + 5, &out->blue)) {
86 out->type = COLOR_RGB;
87 return 0;
91 /* Then pick from our human-readable color names... */
92 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
93 if (match_word(name, len, color_names[i])) {
94 out->type = COLOR_ANSI;
95 out->value = i;
96 return 0;
100 /* And finally try a literal 256-color-mode number */
101 val = strtol(name, &end, 10);
102 if (end - name == len) {
104 * Allow "-1" as an alias for "normal", but other negative
105 * numbers are bogus.
107 if (val < -1)
108 ; /* fall through to error */
109 else if (val < 0) {
110 out->type = COLOR_NORMAL;
111 return 0;
112 /* Rewrite low numbers as more-portable standard colors. */
113 } else if (val < 8) {
114 out->type = COLOR_ANSI;
115 out->value = val;
116 return 0;
117 } else if (val < 256) {
118 out->type = COLOR_256;
119 out->value = val;
120 return 0;
124 return -1;
127 static int parse_attr(const char *name, size_t len)
129 static const struct {
130 const char *name;
131 size_t len;
132 int val, neg;
133 } attrs[] = {
134 #define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }
135 ATTR("bold", 1, 22),
136 ATTR("dim", 2, 22),
137 ATTR("italic", 3, 23),
138 ATTR("ul", 4, 24),
139 ATTR("blink", 5, 25),
140 ATTR("reverse", 7, 27),
141 ATTR("strike", 9, 29)
142 #undef ATTR
144 int negate = 0;
145 int i;
147 if (skip_prefix_mem(name, len, "no", &name, &len)) {
148 skip_prefix_mem(name, len, "-", &name, &len);
149 negate = 1;
152 for (i = 0; i < ARRAY_SIZE(attrs); i++) {
153 if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))
154 return negate ? attrs[i].neg : attrs[i].val;
156 return -1;
159 int color_parse(const char *value, char *dst)
161 return color_parse_mem(value, strlen(value), dst);
165 * Write the ANSI color codes for "c" to "out"; the string should
166 * already have the ANSI escape code in it. "out" should have enough
167 * space in it to fit any color.
169 static char *color_output(char *out, int len, const struct color *c, char type)
171 switch (c->type) {
172 case COLOR_UNSPECIFIED:
173 case COLOR_NORMAL:
174 break;
175 case COLOR_ANSI:
176 if (len < 2)
177 die("BUG: color parsing ran out of space");
178 *out++ = type;
179 *out++ = '0' + c->value;
180 break;
181 case COLOR_256:
182 out += xsnprintf(out, len, "%c8;5;%d", type, c->value);
183 break;
184 case COLOR_RGB:
185 out += xsnprintf(out, len, "%c8;2;%d;%d;%d", type,
186 c->red, c->green, c->blue);
187 break;
189 return out;
192 static int color_empty(const struct color *c)
194 return c->type <= COLOR_NORMAL;
197 int color_parse_mem(const char *value, int value_len, char *dst)
199 const char *ptr = value;
200 int len = value_len;
201 char *end = dst + COLOR_MAXLEN;
202 unsigned int attr = 0;
203 struct color fg = { COLOR_UNSPECIFIED };
204 struct color bg = { COLOR_UNSPECIFIED };
206 while (len > 0 && isspace(*ptr)) {
207 ptr++;
208 len--;
211 if (!len) {
212 dst[0] = '\0';
213 return 0;
216 if (!strncasecmp(ptr, "reset", len)) {
217 xsnprintf(dst, end - dst, GIT_COLOR_RESET);
218 return 0;
221 /* [fg [bg]] [attr]... */
222 while (len > 0) {
223 const char *word = ptr;
224 struct color c = { COLOR_UNSPECIFIED };
225 int val, wordlen = 0;
227 while (len > 0 && !isspace(word[wordlen])) {
228 wordlen++;
229 len--;
232 ptr = word + wordlen;
233 while (len > 0 && isspace(*ptr)) {
234 ptr++;
235 len--;
238 if (!parse_color(&c, word, wordlen)) {
239 if (fg.type == COLOR_UNSPECIFIED) {
240 fg = c;
241 continue;
243 if (bg.type == COLOR_UNSPECIFIED) {
244 bg = c;
245 continue;
247 goto bad;
249 val = parse_attr(word, wordlen);
250 if (0 <= val)
251 attr |= (1 << val);
252 else
253 goto bad;
256 #undef OUT
257 #define OUT(x) do { \
258 if (dst == end) \
259 die("BUG: color parsing ran out of space"); \
260 *dst++ = (x); \
261 } while(0)
263 if (attr || !color_empty(&fg) || !color_empty(&bg)) {
264 int sep = 0;
265 int i;
267 OUT('\033');
268 OUT('[');
270 for (i = 0; attr; i++) {
271 unsigned bit = (1 << i);
272 if (!(attr & bit))
273 continue;
274 attr &= ~bit;
275 if (sep++)
276 OUT(';');
277 dst += xsnprintf(dst, end - dst, "%d", i);
279 if (!color_empty(&fg)) {
280 if (sep++)
281 OUT(';');
282 /* foreground colors are all in the 3x range */
283 dst = color_output(dst, end - dst, &fg, '3');
285 if (!color_empty(&bg)) {
286 if (sep++)
287 OUT(';');
288 /* background colors are all in the 4x range */
289 dst = color_output(dst, end - dst, &bg, '4');
291 OUT('m');
293 OUT(0);
294 return 0;
295 bad:
296 return error(_("invalid color value: %.*s"), value_len, value);
297 #undef OUT
300 int git_config_colorbool(const char *var, const char *value)
302 if (value) {
303 if (!strcasecmp(value, "never"))
304 return 0;
305 if (!strcasecmp(value, "always"))
306 return 1;
307 if (!strcasecmp(value, "auto"))
308 return GIT_COLOR_AUTO;
311 if (!var)
312 return -1;
314 /* Missing or explicit false to turn off colorization */
315 if (!git_config_bool(var, value))
316 return 0;
318 /* any normal truth value defaults to 'auto' */
319 return GIT_COLOR_AUTO;
322 static int check_auto_color(void)
324 if (color_stdout_is_tty < 0)
325 color_stdout_is_tty = isatty(1);
326 if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
327 if (!is_terminal_dumb())
328 return 1;
330 return 0;
333 int want_color(int var)
336 * NEEDSWORK: This function is sometimes used from multiple threads, and
337 * we end up using want_auto racily. That "should not matter" since
338 * we always write the same value, but it's still wrong. This function
339 * is listed in .tsan-suppressions for the time being.
342 static int want_auto = -1;
344 if (var < 0)
345 var = git_use_color_default;
347 if (var == GIT_COLOR_AUTO) {
348 if (want_auto < 0)
349 want_auto = check_auto_color();
350 return want_auto;
352 return var;
355 int git_color_config(const char *var, const char *value, void *cb)
357 if (!strcmp(var, "color.ui")) {
358 git_use_color_default = git_config_colorbool(var, value);
359 return 0;
362 return 0;
365 int git_color_default_config(const char *var, const char *value, void *cb)
367 if (git_color_config(var, value, cb) < 0)
368 return -1;
370 return git_default_config(var, value, cb);
373 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
375 if (*color)
376 fprintf(fp, "%s", color);
377 fprintf(fp, "%s", sb->buf);
378 if (*color)
379 fprintf(fp, "%s", GIT_COLOR_RESET);
382 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
383 va_list args, const char *trail)
385 int r = 0;
387 if (*color)
388 r += fprintf(fp, "%s", color);
389 r += vfprintf(fp, fmt, args);
390 if (*color)
391 r += fprintf(fp, "%s", GIT_COLOR_RESET);
392 if (trail)
393 r += fprintf(fp, "%s", trail);
394 return r;
397 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
399 va_list args;
400 int r;
401 va_start(args, fmt);
402 r = color_vfprintf(fp, color, fmt, args, NULL);
403 va_end(args);
404 return r;
407 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
409 va_list args;
410 int r;
411 va_start(args, fmt);
412 r = color_vfprintf(fp, color, fmt, args, "\n");
413 va_end(args);
414 return r;
417 int color_is_nil(const char *c)
419 return !strcmp(c, "NIL");