color: support "italic" attribute
[git/git.git] / color.c
CommitLineData
7c92fe0e 1#include "cache.h"
85023577 2#include "color.h"
7c92fe0e 3
4c7f1819 4static int git_use_color_default = GIT_COLOR_AUTO;
e269eb79 5int color_stdout_is_tty = -1;
6b2f2d98 6
7cd52b5b
DM
7/*
8 * The list of available column colors.
9 */
10const char *column_colors_ansi[] = {
11 GIT_COLOR_RED,
12 GIT_COLOR_GREEN,
13 GIT_COLOR_YELLOW,
14 GIT_COLOR_BLUE,
15 GIT_COLOR_MAGENTA,
16 GIT_COLOR_CYAN,
17 GIT_COLOR_BOLD_RED,
18 GIT_COLOR_BOLD_GREEN,
19 GIT_COLOR_BOLD_YELLOW,
20 GIT_COLOR_BOLD_BLUE,
21 GIT_COLOR_BOLD_MAGENTA,
22 GIT_COLOR_BOLD_CYAN,
23 GIT_COLOR_RESET,
24};
25
26/* Ignore the RESET at the end when giving the size */
27const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
28
695d95df
JK
29/* An individual foreground or background color. */
30struct color {
31 enum {
32 COLOR_UNSPECIFIED = 0,
33 COLOR_NORMAL,
34 COLOR_ANSI, /* basic 0-7 ANSI colors */
17a4be26
JK
35 COLOR_256,
36 COLOR_RGB
695d95df
JK
37 } type;
38 /* The numeric value for ANSI and 256-color modes */
39 unsigned char value;
17a4be26
JK
40 /* 24-bit RGB color values */
41 unsigned char red, green, blue;
695d95df
JK
42};
43
44/*
45 * "word" is a buffer of length "len"; does it match the NUL-terminated
46 * "match" exactly?
47 */
48static int match_word(const char *word, int len, const char *match)
7c92fe0e 49{
695d95df
JK
50 return !strncasecmp(word, match, len) && !match[len];
51}
52
17a4be26
JK
53static int get_hex_color(const char *in, unsigned char *out)
54{
55 unsigned int val;
56 val = (hexval(in[0]) << 4) | hexval(in[1]);
57 if (val & ~0xff)
58 return -1;
59 *out = val;
60 return 0;
61}
62
695d95df
JK
63static int parse_color(struct color *out, const char *name, int len)
64{
65 /* Positions in array must match ANSI color codes */
7c92fe0e 66 static const char * const color_names[] = {
695d95df 67 "black", "red", "green", "yellow",
7c92fe0e
JK
68 "blue", "magenta", "cyan", "white"
69 };
70 char *end;
71 int i;
695d95df
JK
72 long val;
73
74 /* First try the special word "normal"... */
75 if (match_word(name, len, "normal")) {
76 out->type = COLOR_NORMAL;
77 return 0;
78 }
79
17a4be26
JK
80 /* Try a 24-bit RGB value */
81 if (len == 7 && name[0] == '#') {
82 if (!get_hex_color(name + 1, &out->red) &&
83 !get_hex_color(name + 3, &out->green) &&
84 !get_hex_color(name + 5, &out->blue)) {
85 out->type = COLOR_RGB;
86 return 0;
87 }
88 }
89
695d95df 90 /* Then pick from our human-readable color names... */
7c92fe0e 91 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
695d95df
JK
92 if (match_word(name, len, color_names[i])) {
93 out->type = COLOR_ANSI;
94 out->value = i;
95 return 0;
96 }
7c92fe0e 97 }
695d95df
JK
98
99 /* And finally try a literal 256-color-mode number */
100 val = strtol(name, &end, 10);
101 if (end - name == len) {
102 /*
103 * Allow "-1" as an alias for "normal", but other negative
104 * numbers are bogus.
105 */
106 if (val < -1)
107 ; /* fall through to error */
108 else if (val < 0) {
109 out->type = COLOR_NORMAL;
110 return 0;
111 /* Rewrite low numbers as more-portable standard colors. */
112 } else if (val < 8) {
113 out->type = COLOR_ANSI;
114 out->value = val;
3759d27a 115 return 0;
695d95df
JK
116 } else if (val < 256) {
117 out->type = COLOR_256;
118 out->value = val;
119 return 0;
120 }
121 }
122
123 return -1;
7c92fe0e
JK
124}
125
df8e472c 126static int parse_attr(const char *name, size_t len)
7c92fe0e 127{
df8e472c
JK
128 static const struct {
129 const char *name;
130 size_t len;
131 int val, neg;
132 } attrs[] = {
133#define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }
134 ATTR("bold", 1, 22),
135 ATTR("dim", 2, 22),
54590a0e 136 ATTR("italic", 3, 23),
df8e472c
JK
137 ATTR("ul", 4, 24),
138 ATTR("blink", 5, 25),
139 ATTR("reverse", 7, 27)
140#undef ATTR
7c92fe0e 141 };
df8e472c 142 int negate = 0;
7c92fe0e 143 int i;
df8e472c 144
5621068f
JK
145 if (skip_prefix_mem(name, len, "no", &name, &len)) {
146 skip_prefix_mem(name, len, "-", &name, &len);
df8e472c 147 negate = 1;
5621068f 148 }
df8e472c
JK
149
150 for (i = 0; i < ARRAY_SIZE(attrs); i++) {
151 if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))
152 return negate ? attrs[i].neg : attrs[i].val;
7c92fe0e
JK
153 }
154 return -1;
155}
156
f6c5a296 157int color_parse(const char *value, char *dst)
2c2dc7c8 158{
f6c5a296 159 return color_parse_mem(value, strlen(value), dst);
2c2dc7c8
RS
160}
161
695d95df
JK
162/*
163 * Write the ANSI color codes for "c" to "out"; the string should
164 * already have the ANSI escape code in it. "out" should have enough
165 * space in it to fit any color.
166 */
167static char *color_output(char *out, const struct color *c, char type)
168{
169 switch (c->type) {
170 case COLOR_UNSPECIFIED:
171 case COLOR_NORMAL:
172 break;
173 case COLOR_ANSI:
174 *out++ = type;
175 *out++ = '0' + c->value;
176 break;
177 case COLOR_256:
178 out += sprintf(out, "%c8;5;%d", type, c->value);
179 break;
17a4be26
JK
180 case COLOR_RGB:
181 out += sprintf(out, "%c8;2;%d;%d;%d", type,
182 c->red, c->green, c->blue);
183 break;
695d95df
JK
184 }
185 return out;
186}
187
188static int color_empty(const struct color *c)
189{
190 return c->type <= COLOR_NORMAL;
191}
192
f6c5a296 193int color_parse_mem(const char *value, int value_len, char *dst)
7c92fe0e
JK
194{
195 const char *ptr = value;
2c2dc7c8 196 int len = value_len;
8b124135 197 unsigned int attr = 0;
695d95df
JK
198 struct color fg = { COLOR_UNSPECIFIED };
199 struct color bg = { COLOR_UNSPECIFIED };
7c92fe0e 200
2c2dc7c8 201 if (!strncasecmp(value, "reset", len)) {
dc6ebd4c 202 strcpy(dst, GIT_COLOR_RESET);
f6c5a296 203 return 0;
7c92fe0e
JK
204 }
205
8b124135 206 /* [fg [bg]] [attr]... */
2c2dc7c8 207 while (len > 0) {
7c92fe0e 208 const char *word = ptr;
695d95df 209 struct color c;
2c2dc7c8 210 int val, wordlen = 0;
7c92fe0e 211
2c2dc7c8
RS
212 while (len > 0 && !isspace(word[wordlen])) {
213 wordlen++;
214 len--;
215 }
7c92fe0e 216
2c2dc7c8
RS
217 ptr = word + wordlen;
218 while (len > 0 && isspace(*ptr)) {
7c92fe0e 219 ptr++;
2c2dc7c8
RS
220 len--;
221 }
7c92fe0e 222
695d95df
JK
223 if (!parse_color(&c, word, wordlen)) {
224 if (fg.type == COLOR_UNSPECIFIED) {
225 fg = c;
7c92fe0e
JK
226 continue;
227 }
695d95df
JK
228 if (bg.type == COLOR_UNSPECIFIED) {
229 bg = c;
7c92fe0e
JK
230 continue;
231 }
232 goto bad;
233 }
2c2dc7c8 234 val = parse_attr(word, wordlen);
8b124135
JH
235 if (0 <= val)
236 attr |= (1 << val);
237 else
7c92fe0e 238 goto bad;
7c92fe0e
JK
239 }
240
695d95df 241 if (attr || !color_empty(&fg) || !color_empty(&bg)) {
7c92fe0e 242 int sep = 0;
8b124135 243 int i;
7c92fe0e
JK
244
245 *dst++ = '\033';
246 *dst++ = '[';
8b124135
JH
247
248 for (i = 0; attr; i++) {
249 unsigned bit = (1 << i);
250 if (!(attr & bit))
251 continue;
252 attr &= ~bit;
253 if (sep++)
254 *dst++ = ';';
ff40d185 255 dst += sprintf(dst, "%d", i);
7c92fe0e 256 }
695d95df 257 if (!color_empty(&fg)) {
7c92fe0e
JK
258 if (sep++)
259 *dst++ = ';';
71b59849
JK
260 /* foreground colors are all in the 3x range */
261 dst = color_output(dst, &fg, '3');
7c92fe0e 262 }
695d95df 263 if (!color_empty(&bg)) {
7c92fe0e
JK
264 if (sep++)
265 *dst++ = ';';
71b59849
JK
266 /* background colors are all in the 4x range */
267 dst = color_output(dst, &bg, '4');
7c92fe0e
JK
268 }
269 *dst++ = 'm';
270 }
271 *dst = 0;
f6c5a296 272 return 0;
7c92fe0e 273bad:
f6c5a296 274 return error(_("invalid color value: %.*s"), value_len, value);
7c92fe0e
JK
275}
276
e269eb79 277int git_config_colorbool(const char *var, const char *value)
7c92fe0e 278{
57f2b842
JH
279 if (value) {
280 if (!strcasecmp(value, "never"))
281 return 0;
282 if (!strcasecmp(value, "always"))
283 return 1;
284 if (!strcasecmp(value, "auto"))
daa0c3d9 285 return GIT_COLOR_AUTO;
7c92fe0e 286 }
57f2b842 287
73e9da01
ML
288 if (!var)
289 return -1;
290
57f2b842
JH
291 /* Missing or explicit false to turn off colorization */
292 if (!git_config_bool(var, value))
7c92fe0e 293 return 0;
57f2b842
JH
294
295 /* any normal truth value defaults to 'auto' */
daa0c3d9
JK
296 return GIT_COLOR_AUTO;
297}
298
299static int check_auto_color(void)
300{
e269eb79
JK
301 if (color_stdout_is_tty < 0)
302 color_stdout_is_tty = isatty(1);
303 if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
57f2b842
JH
304 char *term = getenv("TERM");
305 if (term && strcmp(term, "dumb"))
306 return 1;
307 }
308 return 0;
7c92fe0e
JK
309}
310
daa0c3d9
JK
311int want_color(int var)
312{
313 static int want_auto = -1;
314
c9bfb953
JK
315 if (var < 0)
316 var = git_use_color_default;
317
daa0c3d9
JK
318 if (var == GIT_COLOR_AUTO) {
319 if (want_auto < 0)
320 want_auto = check_auto_color();
321 return want_auto;
322 }
c9bfb953 323 return var;
daa0c3d9
JK
324}
325
3e1dd17a 326int git_color_config(const char *var, const char *value, void *cb)
6b2f2d98
MK
327{
328 if (!strcmp(var, "color.ui")) {
e269eb79 329 git_use_color_default = git_config_colorbool(var, value);
6b2f2d98
MK
330 return 0;
331 }
332
3e1dd17a
JK
333 return 0;
334}
335
336int git_color_default_config(const char *var, const char *value, void *cb)
337{
338 if (git_color_config(var, value, cb) < 0)
339 return -1;
340
ef90d6d4 341 return git_default_config(var, value, cb);
6b2f2d98
MK
342}
343
becbdae8
JN
344void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
345{
346 if (*color)
347 fprintf(fp, "%s", color);
348 fprintf(fp, "%s", sb->buf);
349 if (*color)
350 fprintf(fp, "%s", GIT_COLOR_RESET);
351}
352
f26a0012 353static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
7c92fe0e
JK
354 va_list args, const char *trail)
355{
356 int r = 0;
357
358 if (*color)
f26a0012
KH
359 r += fprintf(fp, "%s", color);
360 r += vfprintf(fp, fmt, args);
7c92fe0e 361 if (*color)
dc6ebd4c 362 r += fprintf(fp, "%s", GIT_COLOR_RESET);
7c92fe0e 363 if (trail)
f26a0012 364 r += fprintf(fp, "%s", trail);
7c92fe0e
JK
365 return r;
366}
367
368
369
f26a0012 370int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
7c92fe0e
JK
371{
372 va_list args;
373 int r;
374 va_start(args, fmt);
f26a0012 375 r = color_vfprintf(fp, color, fmt, args, NULL);
7c92fe0e
JK
376 va_end(args);
377 return r;
378}
379
f26a0012 380int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
7c92fe0e
JK
381{
382 va_list args;
383 int r;
384 va_start(args, fmt);
f26a0012 385 r = color_vfprintf(fp, color, fmt, args, "\n");
7c92fe0e
JK
386 va_end(args);
387 return r;
388}
148135fc
JK
389
390int color_is_nil(const char *c)
391{
392 return !strcmp(c, "NIL");
393}