1 #include "cache.h"
2 #include "config.h"
3 #include "color.h"
4
5 static int git_use_color_default = GIT_COLOR_AUTO;
6 int color_stdout_is_tty = -1;
7
8 /*
9 * The list of available column colors.
10 */
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,
25 };
26
27 /* Ignore the RESET at the end when giving the size */
28 const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
29
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;
43 };
44
45 /*
46 * "word" is a buffer of length "len"; does it match the NUL-terminated
47 * "match" exactly?
48 */
match_word(const char * word,int len,const char * match)49 static int match_word(const char *word, int len, const char *match)
50 {
51 return !strncasecmp(word, match, len) && !match[len];
52 }
53
get_hex_color(const char * in,unsigned char * out)54 static int get_hex_color(const char *in, unsigned char *out)
55 {
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;
62 }
63
parse_color(struct color * out,const char * name,int len)64 static int parse_color(struct color *out, const char *name, int len)
65 {
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"
70 };
71 char *end;
72 int i;
73 long val;
74
75 /* First try the special word "normal"... */
76 if (match_word(name, len, "normal")) {
77 out->type = COLOR_NORMAL;
78 return 0;
79 }
80
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;
88 }
89 }
90
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;
97 }
98 }
99
100 /* And finally try a literal 256-color-mode number */
101 val = strtol(name, &end, 10);
102 if (end - name == len) {
103 /*
104 * Allow "-1" as an alias for "normal", but other negative
105 * numbers are bogus.
106 */
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;
121 }
122 }
123
124 return -1;
125 }
126
parse_attr(const char * name,size_t len)127 static int parse_attr(const char *name, size_t len)
128 {
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
143 };
144 int negate = 0;
145 int i;
146
147 if (skip_prefix_mem(name, len, "no", &name, &len)) {
148 skip_prefix_mem(name, len, "-", &name, &len);
149 negate = 1;
150 }
151
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;
155 }
156 return -1;
157 }
158
color_parse(const char * value,char * dst)159 int color_parse(const char *value, char *dst)
160 {
161 return color_parse_mem(value, strlen(value), dst);
162 }
163
164 /*
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.
168 */
color_output(char * out,int len,const struct color * c,char type)169 static char *color_output(char *out, int len, const struct color *c, char type)
170 {
171 switch (c->type) {
172 case COLOR_UNSPECIFIED:
173 case COLOR_NORMAL:
174 break;
175 case COLOR_ANSI:
176 if (len < 2)
177 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;
188 }
189 return out;
190 }
191
color_empty(const struct color * c)192 static int color_empty(const struct color *c)
193 {
194 return c->type <= COLOR_NORMAL;
195 }
196
color_parse_mem(const char * value,int value_len,char * dst)197 int color_parse_mem(const char *value, int value_len, char *dst)
198 {
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 };
205
206 while (len > 0 && isspace(*ptr)) {
207 ptr++;
208 len--;
209 }
210
211 if (!len) {
212 dst[0] = '\0';
213 return 0;
214 }
215
216 if (!strncasecmp(ptr, "reset", len)) {
217 xsnprintf(dst, end - dst, GIT_COLOR_RESET);
218 return 0;
219 }
220
221 /* [fg [bg]] [attr]... */
222 while (len > 0) {
223 const char *word = ptr;
224 struct color c = { COLOR_UNSPECIFIED };
225 int val, wordlen = 0;
226
227 while (len > 0 && !isspace(word[wordlen])) {
228 wordlen++;
229 len--;
230 }
231
232 ptr = word + wordlen;
233 while (len > 0 && isspace(*ptr)) {
234 ptr++;
235 len--;
236 }
237
238 if (!parse_color(&c, word, wordlen)) {
239 if (fg.type == COLOR_UNSPECIFIED) {
240 fg = c;
241 continue;
242 }
243 if (bg.type == COLOR_UNSPECIFIED) {
244 bg = c;
245 continue;
246 }
247 goto bad;
248 }
249 val = parse_attr(word, wordlen);
250 if (0 <= val)
251 attr |= (1 << val);
252 else
253 goto bad;
254 }
255
256 #undef OUT
257 #define OUT(x) do { \
258 if (dst == end) \
259 BUG("color parsing ran out of space"); \
260 *dst++ = (x); \
261 } while(0)
262
263 if (attr || !color_empty(&fg) || !color_empty(&bg)) {
264 int sep = 0;
265 int i;
266
267 OUT('\033');
268 OUT('[');
269
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);
278 }
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');
284 }
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');
290 }
291 OUT('m');
292 }
293 OUT(0);
294 return 0;
295 bad:
296 return error(_("invalid color value: %.*s"), value_len, value);
297 #undef OUT
298 }
299
git_config_colorbool(const char * var,const char * value)300 int git_config_colorbool(const char *var, const char *value)
301 {
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;
309 }
310
311 if (!var)
312 return -1;
313
314 /* Missing or explicit false to turn off colorization */
315 if (!git_config_bool(var, value))
316 return 0;
317
318 /* any normal truth value defaults to 'auto' */
319 return GIT_COLOR_AUTO;
320 }
321
check_auto_color(int fd)322 static int check_auto_color(int fd)
323 {
324 static int color_stderr_is_tty = -1;
325 int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
326 if (*is_tty_p < 0)
327 *is_tty_p = isatty(fd);
328 if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
329 if (!is_terminal_dumb())
330 return 1;
331 }
332 return 0;
333 }
334
want_color_fd(int fd,int var)335 int want_color_fd(int fd, int var)
336 {
337 /*
338 * NEEDSWORK: This function is sometimes used from multiple threads, and
339 * we end up using want_auto racily. That "should not matter" since
340 * we always write the same value, but it's still wrong. This function
341 * is listed in .tsan-suppressions for the time being.
342 */
343
344 static int want_auto[3] = { -1, -1, -1 };
345
346 if (fd < 1 || fd >= ARRAY_SIZE(want_auto))
347 BUG("file descriptor out of range: %d", fd);
348
349 if (var < 0)
350 var = git_use_color_default;
351
352 if (var == GIT_COLOR_AUTO) {
353 if (want_auto[fd] < 0)
354 want_auto[fd] = check_auto_color(fd);
355 return want_auto[fd];
356 }
357 return var;
358 }
359
git_color_config(const char * var,const char * value,void * cb)360 int git_color_config(const char *var, const char *value, void *cb)
361 {
362 if (!strcmp(var, "color.ui")) {
363 git_use_color_default = git_config_colorbool(var, value);
364 return 0;
365 }
366
367 return 0;
368 }
369
git_color_default_config(const char * var,const char * value,void * cb)370 int git_color_default_config(const char *var, const char *value, void *cb)
371 {
372 if (git_color_config(var, value, cb) < 0)
373 return -1;
374
375 return git_default_config(var, value, cb);
376 }
377
color_print_strbuf(FILE * fp,const char * color,const struct strbuf * sb)378 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
379 {
380 if (*color)
381 fprintf(fp, "%s", color);
382 fprintf(fp, "%s", sb->buf);
383 if (*color)
384 fprintf(fp, "%s", GIT_COLOR_RESET);
385 }
386
color_vfprintf(FILE * fp,const char * color,const char * fmt,va_list args,const char * trail)387 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
388 va_list args, const char *trail)
389 {
390 int r = 0;
391
392 if (*color)
393 r += fprintf(fp, "%s", color);
394 r += vfprintf(fp, fmt, args);
395 if (*color)
396 r += fprintf(fp, "%s", GIT_COLOR_RESET);
397 if (trail)
398 r += fprintf(fp, "%s", trail);
399 return r;
400 }
401
color_fprintf(FILE * fp,const char * color,const char * fmt,...)402 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
403 {
404 va_list args;
405 int r;
406 va_start(args, fmt);
407 r = color_vfprintf(fp, color, fmt, args, NULL);
408 va_end(args);
409 return r;
410 }
411
color_fprintf_ln(FILE * fp,const char * color,const char * fmt,...)412 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
413 {
414 va_list args;
415 int r;
416 va_start(args, fmt);
417 r = color_vfprintf(fp, color, fmt, args, "\n");
418 va_end(args);
419 return r;
420 }
421
color_is_nil(const char * c)422 int color_is_nil(const char *c)
423 {
424 return !strcmp(c, "NIL");
425 }
426