summaryrefslogtreecommitdiff
path: root/color.c
blob: 3afda9d9dc20b184f1bc1450c0a734c67fc0bfda (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
#include "cache.h"
#include "color.h"
 
static int git_use_color_default = GIT_COLOR_AUTO;
int color_stdout_is_tty = -1;
 
/*
 * The list of available column colors.
 */
const char *column_colors_ansi[] = {
	GIT_COLOR_RED,
	GIT_COLOR_GREEN,
	GIT_COLOR_YELLOW,
	GIT_COLOR_BLUE,
	GIT_COLOR_MAGENTA,
	GIT_COLOR_CYAN,
	GIT_COLOR_BOLD_RED,
	GIT_COLOR_BOLD_GREEN,
	GIT_COLOR_BOLD_YELLOW,
	GIT_COLOR_BOLD_BLUE,
	GIT_COLOR_BOLD_MAGENTA,
	GIT_COLOR_BOLD_CYAN,
	GIT_COLOR_RESET,
};
 
/* Ignore the RESET at the end when giving the size */
const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
 
/* An individual foreground or background color. */
struct color {
	enum {
		COLOR_UNSPECIFIED = 0,
		COLOR_NORMAL,
		COLOR_ANSI, /* basic 0-7 ANSI colors */
		COLOR_256
	} type;
	/* The numeric value for ANSI and 256-color modes */
	unsigned char value;
};
 
/*
 * "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 parse_color(struct color *out, const char *name, int len)
{
	/* Positions in array must match ANSI color codes */
	static const char * const color_names[] = {
		"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;
	}
 
	/* Then pick from our human-readable color names... */
	for (i = 0; i < ARRAY_SIZE(color_names); i++) {
		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;
		} else if (val < 256) {
			out->type = COLOR_256;
			out->value = val;
			return 0;
		}
	}
 
	return -1;
}
 
static int parse_attr(const char *name, int len)
{
	static const int attr_values[] = { 1, 2, 4, 5, 7 };
	static const char * const attr_names[] = {
		"bold", "dim", "ul", "blink", "reverse"
	};
	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];
	}
	return -1;
}
 
int color_parse(const char *value, char *dst)
{
	return color_parse_mem(value, strlen(value), dst);
}
 
#define COLOR_FOREGROUND '3'
#define COLOR_BACKGROUND '4'
 
/*
 * 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, const struct color *c, char type)
{
	switch (c->type) {
	case COLOR_UNSPECIFIED:
	case COLOR_NORMAL:
		break;
	case COLOR_ANSI:
		*out++ = type;
		*out++ = '0' + c->value;
		break;
	case COLOR_256:
		out += sprintf(out, "%c8;5;%d", type, c->value);
		break;
	}
	return out;
}
 
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;
	unsigned int attr = 0;
	struct color fg = { COLOR_UNSPECIFIED };
	struct color bg = { COLOR_UNSPECIFIED };
 
	if (!strncasecmp(value, "reset", len)) {
		strcpy(dst, GIT_COLOR_RESET);
		return 0;
	}
 
	/* [fg [bg]] [attr]... */
	while (len > 0) {
		const char *word = ptr;
		struct color c;
		int val, wordlen = 0;
 
		while (len > 0 && !isspace(word[wordlen])) {
			wordlen++;
			len--;
		}
 
		ptr = word + wordlen;
		while (len > 0 && isspace(*ptr)) {
			ptr++;
			len--;
		}
 
		if (!parse_color(&c, word, wordlen)) {
			if (fg.type == COLOR_UNSPECIFIED) {
				fg = c;
				continue;
			}
			if (bg.type == COLOR_UNSPECIFIED) {
				bg = c;
				continue;
			}
			goto bad;
		}
		val = parse_attr(word, wordlen);
		if (0 <= val)
			attr |= (1 << val);
		else
			goto bad;
	}
 
	if (attr || !color_empty(&fg) || !color_empty(&bg)) {
		int sep = 0;
		int i;
 
		*dst++ = '\033';
		*dst++ = '[';
 
		for (i = 0; attr; i++) {
			unsigned bit = (1 << i);
			if (!(attr & bit))
				continue;
			attr &= ~bit;
			if (sep++)
				*dst++ = ';';
			*dst++ = '0' + i;
		}
		if (!color_empty(&fg)) {
			if (sep++)
				*dst++ = ';';
			dst = color_output(dst, &fg, COLOR_FOREGROUND);
		}
		if (!color_empty(&bg)) {
			if (sep++)
				*dst++ = ';';
			dst = color_output(dst, &bg, COLOR_BACKGROUND);
		}
		*dst++ = 'm';
	}
	*dst = 0;
	return 0;
bad:
	return error(_("invalid color value: %.*s"), value_len, value);
}
 
int git_config_colorbool(const char *var, const char *value)
{
	if (value) {
		if (!strcasecmp(value, "never"))
			return 0;
		if (!strcasecmp(value, "always"))
			return 1;
		if (!strcasecmp(value, "auto"))
			return GIT_COLOR_AUTO;
	}
 
	if (!var)
		return -1;
 
	/* Missing or explicit false to turn off colorization */
	if (!git_config_bool(var, value))
		return 0;
 
	/* any normal truth value defaults to 'auto' */
	return GIT_COLOR_AUTO;
}
 
static int check_auto_color(void)
{
	if (color_stdout_is_tty < 0)
		color_stdout_is_tty = isatty(1);
	if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
		char *term = getenv("TERM");
		if (term && strcmp(term, "dumb"))
			return 1;
	}
	return 0;
}
 
int want_color(int var)
{
	static int want_auto = -1;
 
	if (var < 0)
		var = git_use_color_default;
 
	if (var == GIT_COLOR_AUTO) {
		if (want_auto < 0)
			want_auto = check_auto_color();
		return want_auto;
	}
	return var;
}
 
int git_color_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "color.ui")) {
		git_use_color_default = git_config_colorbool(var, value);
		return 0;
	}
 
	return 0;
}
 
int git_color_default_config(const char *var, const char *value, void *cb)
{
	if (git_color_config(var, value, cb) < 0)
		return -1;
 
	return git_default_config(var, value, cb);
}
 
void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
{
	if (*color)
		fprintf(fp, "%s", color);
	fprintf(fp, "%s", sb->buf);
	if (*color)
		fprintf(fp, "%s", GIT_COLOR_RESET);
}
 
static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
		va_list args, const char *trail)
{
	int r = 0;
 
	if (*color)
		r += fprintf(fp, "%s", color);
	r += vfprintf(fp, fmt, args);
	if (*color)
		r += fprintf(fp, "%s", GIT_COLOR_RESET);
	if (trail)
		r += fprintf(fp, "%s", trail);
	return r;
}
 
 
 
int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
{
	va_list args;
	int r;
	va_start(args, fmt);
	r = color_vfprintf(fp, color, fmt, args, NULL);
	va_end(args);
	return r;
}
 
int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
{
	va_list args;
	int r;
	va_start(args, fmt);
	r = color_vfprintf(fp, color, fmt, args, "\n");
	va_end(args);
	return r;
}
 
int color_is_nil(const char *c)
{
	return !strcmp(c, "NIL");
}