freshlybakedca.ke
Git fork
1#define DISABLE_SIGN_COMPARE_WARNINGS
2
3#include "git-compat-util.h"
4#include "config.h"
5#include "color.h"
6#include "editor.h"
7#include "gettext.h"
8#include "hex-ll.h"
9#include "pager.h"
10#include "strbuf.h"
11
12static enum git_colorbool git_use_color_default = GIT_COLOR_AUTO;
13int color_stdout_is_tty = -1;
14
15/*
16 * The list of available column colors.
17 */
18const char *column_colors_ansi[] = {
19 GIT_COLOR_RED,
20 GIT_COLOR_GREEN,
21 GIT_COLOR_YELLOW,
22 GIT_COLOR_BLUE,
23 GIT_COLOR_MAGENTA,
24 GIT_COLOR_CYAN,
25 GIT_COLOR_BOLD_RED,
26 GIT_COLOR_BOLD_GREEN,
27 GIT_COLOR_BOLD_YELLOW,
28 GIT_COLOR_BOLD_BLUE,
29 GIT_COLOR_BOLD_MAGENTA,
30 GIT_COLOR_BOLD_CYAN,
31 GIT_COLOR_RESET,
32};
33
34enum {
35 COLOR_BACKGROUND_OFFSET = 10,
36 COLOR_FOREGROUND_ANSI = 30,
37 COLOR_FOREGROUND_RGB = 38,
38 COLOR_FOREGROUND_256 = 38,
39 COLOR_FOREGROUND_BRIGHT_ANSI = 90,
40};
41
42/* Ignore the RESET at the end when giving the size */
43const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
44
45/* An individual foreground or background color. */
46struct color {
47 enum {
48 COLOR_UNSPECIFIED = 0,
49 COLOR_NORMAL,
50 COLOR_ANSI, /* basic 0-7 ANSI colors + "default" (value = 9) */
51 COLOR_256,
52 COLOR_RGB
53 } type;
54 /* The numeric value for ANSI and 256-color modes */
55 unsigned char value;
56 /* 24-bit RGB color values */
57 unsigned char red, green, blue;
58};
59
60/*
61 * "word" is a buffer of length "len"; does it match the NUL-terminated
62 * "match" exactly?
63 */
64static int match_word(const char *word, int len, const char *match)
65{
66 return !strncasecmp(word, match, len) && !match[len];
67}
68
69static int get_hex_color(const char **inp, int width, unsigned char *out)
70{
71 const char *in = *inp;
72 unsigned int val;
73
74 assert(width == 1 || width == 2);
75 val = (hexval(in[0]) << 4) | hexval(in[width - 1]);
76 if (val & ~0xff)
77 return -1;
78 *inp += width;
79 *out = val;
80 return 0;
81}
82
83/*
84 * If an ANSI color is recognized in "name", fill "out" and return 0.
85 * Otherwise, leave out unchanged and return -1.
86 */
87static int parse_ansi_color(struct color *out, const char *name, int len)
88{
89 /* Positions in array must match ANSI color codes */
90 static const char * const color_names[] = {
91 "black", "red", "green", "yellow",
92 "blue", "magenta", "cyan", "white"
93 };
94 int i;
95 int color_offset = COLOR_FOREGROUND_ANSI;
96
97 if (match_word(name, len, "default")) {
98 /*
99 * Restores to the terminal's default color, which may not be
100 * the same as explicitly setting "white" or "black".
101 *
102 * ECMA-48 - Control Functions \
103 * for Coded Character Sets, 5th edition (June 1991):
104 * > 39 default display colour (implementation-defined)
105 * > 49 default background colour (implementation-defined)
106 *
107 * Although not supported /everywhere/--according to terminfo,
108 * some terminals define "op" (original pair) as a blunt
109 * "set to white on black", or even "send full SGR reset"--
110 * it's standard and well-supported enough that if a user
111 * asks for it in their config this will do the right thing.
112 */
113 out->type = COLOR_ANSI;
114 out->value = 9 + color_offset;
115 return 0;
116 }
117
118 if (strncasecmp(name, "bright", 6) == 0) {
119 color_offset = COLOR_FOREGROUND_BRIGHT_ANSI;
120 name += 6;
121 len -= 6;
122 }
123 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
124 if (match_word(name, len, color_names[i])) {
125 out->type = COLOR_ANSI;
126 out->value = i + color_offset;
127 return 0;
128 }
129 }
130 return -1;
131}
132
133static int parse_color(struct color *out, const char *name, int len)
134{
135 char *end;
136 long val;
137
138 /* First try the special word "normal"... */
139 if (match_word(name, len, "normal")) {
140 out->type = COLOR_NORMAL;
141 return 0;
142 }
143
144 /* Try a 24- or 12-bit RGB value prefixed with '#' */
145 if ((len == 7 || len == 4) && name[0] == '#') {
146 int width_per_color = (len == 7) ? 2 : 1;
147 const char *color = name + 1;
148
149 if (!get_hex_color(&color, width_per_color, &out->red) &&
150 !get_hex_color(&color, width_per_color, &out->green) &&
151 !get_hex_color(&color, width_per_color, &out->blue)) {
152 out->type = COLOR_RGB;
153 return 0;
154 }
155 }
156
157 /* Then pick from our human-readable color names... */
158 if (parse_ansi_color(out, name, len) == 0) {
159 return 0;
160 }
161
162 /* And finally try a literal 256-color-mode number */
163 val = strtol(name, &end, 10);
164 if (end - name == len) {
165 /*
166 * Allow "-1" as an alias for "normal", but other negative
167 * numbers are bogus.
168 */
169 if (val < -1)
170 ; /* fall through to error */
171 else if (val < 0) {
172 out->type = COLOR_NORMAL;
173 return 0;
174 /* Rewrite 0-7 as more-portable standard colors. */
175 } else if (val < 8) {
176 out->type = COLOR_ANSI;
177 out->value = val + COLOR_FOREGROUND_ANSI;
178 return 0;
179 /* Rewrite 8-15 as more-portable aixterm colors. */
180 } else if (val < 16) {
181 out->type = COLOR_ANSI;
182 out->value = val - 8 + COLOR_FOREGROUND_BRIGHT_ANSI;
183 return 0;
184 } else if (val < 256) {
185 out->type = COLOR_256;
186 out->value = val;
187 return 0;
188 }
189 }
190
191 return -1;
192}
193
194static int parse_attr(const char *name, size_t len)
195{
196 static const struct {
197 const char *name;
198 size_t len;
199 int val, neg;
200 } attrs[] = {
201#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }
202 ATTR("bold", 1, 22),
203 ATTR("dim", 2, 22),
204 ATTR("italic", 3, 23),
205 ATTR("ul", 4, 24),
206 ATTR("blink", 5, 25),
207 ATTR("reverse", 7, 27),
208 ATTR("strike", 9, 29)
209#undef ATTR
210 };
211 int negate = 0;
212 int i;
213
214 if (skip_prefix_mem(name, len, "no", &name, &len)) {
215 skip_prefix_mem(name, len, "-", &name, &len);
216 negate = 1;
217 }
218
219 for (i = 0; i < ARRAY_SIZE(attrs); i++) {
220 if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))
221 return negate ? attrs[i].neg : attrs[i].val;
222 }
223 return -1;
224}
225
226int color_parse(const char *value, char *dst)
227{
228 return color_parse_mem(value, strlen(value), dst);
229}
230
231/*
232 * Write the ANSI color codes for "c" to "out"; the string should
233 * already have the ANSI escape code in it. "out" should have enough
234 * space in it to fit any color.
235 */
236static char *color_output(char *out, int len, const struct color *c, int background)
237{
238 int offset = 0;
239
240 if (background)
241 offset = COLOR_BACKGROUND_OFFSET;
242 switch (c->type) {
243 case COLOR_UNSPECIFIED:
244 case COLOR_NORMAL:
245 break;
246 case COLOR_ANSI:
247 out += xsnprintf(out, len, "%d", c->value + offset);
248 break;
249 case COLOR_256:
250 out += xsnprintf(out, len, "%d;5;%d", COLOR_FOREGROUND_256 + offset,
251 c->value);
252 break;
253 case COLOR_RGB:
254 out += xsnprintf(out, len, "%d;2;%d;%d;%d",
255 COLOR_FOREGROUND_RGB + offset,
256 c->red, c->green, c->blue);
257 break;
258 }
259 return out;
260}
261
262static int color_empty(const struct color *c)
263{
264 return c->type <= COLOR_NORMAL;
265}
266
267int color_parse_mem(const char *value, int value_len, char *dst)
268{
269 const char *ptr = value;
270 int len = value_len;
271 char *end = dst + COLOR_MAXLEN;
272 unsigned int has_reset = 0;
273 unsigned int attr = 0;
274 struct color fg = { COLOR_UNSPECIFIED };
275 struct color bg = { COLOR_UNSPECIFIED };
276
277 while (len > 0 && isspace(*ptr)) {
278 ptr++;
279 len--;
280 }
281
282 if (!len) {
283 dst[0] = '\0';
284 return 0;
285 }
286
287 /* [reset] [fg [bg]] [attr]... */
288 while (len > 0) {
289 const char *word = ptr;
290 struct color c = { COLOR_UNSPECIFIED };
291 int val, wordlen = 0;
292
293 while (len > 0 && !isspace(word[wordlen])) {
294 wordlen++;
295 len--;
296 }
297
298 ptr = word + wordlen;
299 while (len > 0 && isspace(*ptr)) {
300 ptr++;
301 len--;
302 }
303
304 if (match_word(word, wordlen, "reset")) {
305 has_reset = 1;
306 continue;
307 }
308
309 if (!parse_color(&c, word, wordlen)) {
310 if (fg.type == COLOR_UNSPECIFIED) {
311 fg = c;
312 continue;
313 }
314 if (bg.type == COLOR_UNSPECIFIED) {
315 bg = c;
316 continue;
317 }
318 goto bad;
319 }
320 val = parse_attr(word, wordlen);
321 if (0 <= val)
322 attr |= (1 << val);
323 else
324 goto bad;
325 }
326
327#undef OUT
328#define OUT(x) do { \
329 if (dst == end) \
330 BUG("color parsing ran out of space"); \
331 *dst++ = (x); \
332} while(0)
333
334 if (has_reset || attr || !color_empty(&fg) || !color_empty(&bg)) {
335 int sep = 0;
336 int i;
337
338 OUT('\033');
339 OUT('[');
340
341 if (has_reset)
342 sep++;
343
344 for (i = 0; attr; i++) {
345 unsigned bit = (1 << i);
346 if (!(attr & bit))
347 continue;
348 attr &= ~bit;
349 if (sep++)
350 OUT(';');
351 dst += xsnprintf(dst, end - dst, "%d", i);
352 }
353 if (!color_empty(&fg)) {
354 if (sep++)
355 OUT(';');
356 dst = color_output(dst, end - dst, &fg, 0);
357 }
358 if (!color_empty(&bg)) {
359 if (sep++)
360 OUT(';');
361 dst = color_output(dst, end - dst, &bg, 1);
362 }
363 OUT('m');
364 }
365 OUT(0);
366 return 0;
367bad:
368 return error(_("invalid color value: %.*s"), value_len, value);
369#undef OUT
370}
371
372enum git_colorbool git_config_colorbool(const char *var, const char *value)
373{
374 if (value) {
375 if (!strcasecmp(value, "never"))
376 return GIT_COLOR_NEVER;
377 if (!strcasecmp(value, "always"))
378 return GIT_COLOR_ALWAYS;
379 if (!strcasecmp(value, "auto"))
380 return GIT_COLOR_AUTO;
381 }
382
383 if (!var)
384 return GIT_COLOR_UNKNOWN;
385
386 /* Missing or explicit false to turn off colorization */
387 if (!git_config_bool(var, value))
388 return GIT_COLOR_NEVER;
389
390 /* any normal truth value defaults to 'auto' */
391 return GIT_COLOR_AUTO;
392}
393
394static bool check_auto_color(int fd)
395{
396 static int color_stderr_is_tty = -1;
397 int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
398 if (*is_tty_p < 0)
399 *is_tty_p = isatty(fd);
400 if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
401 if (!is_terminal_dumb())
402 return true;
403 }
404 return false;
405}
406
407bool want_color_fd(int fd, enum git_colorbool var)
408{
409 /*
410 * NEEDSWORK: This function is sometimes used from multiple threads, and
411 * we end up using want_auto racily. That "should not matter" since
412 * we always write the same value, but it's still wrong. This function
413 * is listed in .tsan-suppressions for the time being.
414 */
415
416 static int want_auto[3] = { -1, -1, -1 };
417
418 if (fd < 1 || fd >= ARRAY_SIZE(want_auto))
419 BUG("file descriptor out of range: %d", fd);
420
421 if (var == GIT_COLOR_UNKNOWN)
422 var = git_use_color_default;
423
424 if (var == GIT_COLOR_AUTO) {
425 if (want_auto[fd] < 0)
426 want_auto[fd] = check_auto_color(fd);
427 return want_auto[fd];
428 }
429 return var == GIT_COLOR_ALWAYS;
430}
431
432int git_color_config(const char *var, const char *value, void *cb UNUSED)
433{
434 if (!strcmp(var, "color.ui")) {
435 git_use_color_default = git_config_colorbool(var, value);
436 return 0;
437 }
438
439 return 0;
440}
441
442void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
443{
444 if (*color)
445 fprintf(fp, "%s", color);
446 fprintf(fp, "%s", sb->buf);
447 if (*color)
448 fprintf(fp, "%s", GIT_COLOR_RESET);
449}
450
451static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
452 va_list args, const char *trail)
453{
454 int r = 0;
455
456 if (*color)
457 r += fprintf(fp, "%s", color);
458 r += vfprintf(fp, fmt, args);
459 if (*color)
460 r += fprintf(fp, "%s", GIT_COLOR_RESET);
461 if (trail)
462 r += fprintf(fp, "%s", trail);
463 return r;
464}
465
466int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
467{
468 va_list args;
469 int r;
470 va_start(args, fmt);
471 r = color_vfprintf(fp, color, fmt, args, NULL);
472 va_end(args);
473 return r;
474}
475
476int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
477{
478 va_list args;
479 int r;
480 va_start(args, fmt);
481 r = color_vfprintf(fp, color, fmt, args, "\n");
482 va_end(args);
483 return r;
484}
485
486int color_is_nil(const char *c)
487{
488 return !strcmp(c, "NIL");
489}