color: delay auto-color decision until point of use
[git/git.git] / color.c
CommitLineData
7c92fe0e 1#include "cache.h"
85023577 2#include "color.h"
7c92fe0e 3
6b2f2d98 4int git_use_color_default = 0;
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
7c92fe0e
JK
29static int parse_color(const char *name, int len)
30{
31 static const char * const color_names[] = {
32 "normal", "black", "red", "green", "yellow",
33 "blue", "magenta", "cyan", "white"
34 };
35 char *end;
36 int i;
37 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
38 const char *str = color_names[i];
39 if (!strncasecmp(name, str, len) && !str[len])
40 return i - 1;
41 }
42 i = strtol(name, &end, 10);
a0cf49c1 43 if (end - name == len && i >= -1 && i <= 255)
7c92fe0e
JK
44 return i;
45 return -2;
46}
47
48static int parse_attr(const char *name, int len)
49{
50 static const int attr_values[] = { 1, 2, 4, 5, 7 };
51 static const char * const attr_names[] = {
52 "bold", "dim", "ul", "blink", "reverse"
53 };
54 int i;
55 for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
56 const char *str = attr_names[i];
57 if (!strncasecmp(name, str, len) && !str[len])
58 return attr_values[i];
59 }
60 return -1;
61}
62
63void color_parse(const char *value, const char *var, char *dst)
2c2dc7c8
RS
64{
65 color_parse_mem(value, strlen(value), var, dst);
66}
67
68void color_parse_mem(const char *value, int value_len, const char *var,
69 char *dst)
7c92fe0e
JK
70{
71 const char *ptr = value;
2c2dc7c8 72 int len = value_len;
8b124135 73 unsigned int attr = 0;
7c92fe0e
JK
74 int fg = -2;
75 int bg = -2;
76
2c2dc7c8 77 if (!strncasecmp(value, "reset", len)) {
dc6ebd4c 78 strcpy(dst, GIT_COLOR_RESET);
7c92fe0e
JK
79 return;
80 }
81
8b124135 82 /* [fg [bg]] [attr]... */
2c2dc7c8 83 while (len > 0) {
7c92fe0e 84 const char *word = ptr;
2c2dc7c8 85 int val, wordlen = 0;
7c92fe0e 86
2c2dc7c8
RS
87 while (len > 0 && !isspace(word[wordlen])) {
88 wordlen++;
89 len--;
90 }
7c92fe0e 91
2c2dc7c8
RS
92 ptr = word + wordlen;
93 while (len > 0 && isspace(*ptr)) {
7c92fe0e 94 ptr++;
2c2dc7c8
RS
95 len--;
96 }
7c92fe0e 97
2c2dc7c8 98 val = parse_color(word, wordlen);
7c92fe0e
JK
99 if (val >= -1) {
100 if (fg == -2) {
101 fg = val;
102 continue;
103 }
104 if (bg == -2) {
105 bg = val;
106 continue;
107 }
108 goto bad;
109 }
2c2dc7c8 110 val = parse_attr(word, wordlen);
8b124135
JH
111 if (0 <= val)
112 attr |= (1 << val);
113 else
7c92fe0e 114 goto bad;
7c92fe0e
JK
115 }
116
8b124135 117 if (attr || fg >= 0 || bg >= 0) {
7c92fe0e 118 int sep = 0;
8b124135 119 int i;
7c92fe0e
JK
120
121 *dst++ = '\033';
122 *dst++ = '[';
8b124135
JH
123
124 for (i = 0; attr; i++) {
125 unsigned bit = (1 << i);
126 if (!(attr & bit))
127 continue;
128 attr &= ~bit;
129 if (sep++)
130 *dst++ = ';';
131 *dst++ = '0' + i;
7c92fe0e
JK
132 }
133 if (fg >= 0) {
134 if (sep++)
135 *dst++ = ';';
136 if (fg < 8) {
137 *dst++ = '3';
138 *dst++ = '0' + fg;
139 } else {
140 dst += sprintf(dst, "38;5;%d", fg);
141 }
142 }
143 if (bg >= 0) {
144 if (sep++)
145 *dst++ = ';';
146 if (bg < 8) {
147 *dst++ = '4';
148 *dst++ = '0' + bg;
149 } else {
150 dst += sprintf(dst, "48;5;%d", bg);
151 }
152 }
153 *dst++ = 'm';
154 }
155 *dst = 0;
156 return;
157bad:
2c2dc7c8 158 die("bad color value '%.*s' for variable '%s'", value_len, value, var);
7c92fe0e
JK
159}
160
e269eb79 161int git_config_colorbool(const char *var, const char *value)
7c92fe0e 162{
57f2b842
JH
163 if (value) {
164 if (!strcasecmp(value, "never"))
165 return 0;
166 if (!strcasecmp(value, "always"))
167 return 1;
168 if (!strcasecmp(value, "auto"))
daa0c3d9 169 return GIT_COLOR_AUTO;
7c92fe0e 170 }
57f2b842 171
73e9da01
ML
172 if (!var)
173 return -1;
174
57f2b842
JH
175 /* Missing or explicit false to turn off colorization */
176 if (!git_config_bool(var, value))
7c92fe0e 177 return 0;
57f2b842
JH
178
179 /* any normal truth value defaults to 'auto' */
daa0c3d9
JK
180 return GIT_COLOR_AUTO;
181}
182
183static int check_auto_color(void)
184{
e269eb79
JK
185 if (color_stdout_is_tty < 0)
186 color_stdout_is_tty = isatty(1);
187 if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
57f2b842
JH
188 char *term = getenv("TERM");
189 if (term && strcmp(term, "dumb"))
190 return 1;
191 }
192 return 0;
7c92fe0e
JK
193}
194
daa0c3d9
JK
195int want_color(int var)
196{
197 static int want_auto = -1;
198
199 if (var == GIT_COLOR_AUTO) {
200 if (want_auto < 0)
201 want_auto = check_auto_color();
202 return want_auto;
203 }
204 return var > 0;
205}
206
ef90d6d4 207int git_color_default_config(const char *var, const char *value, void *cb)
6b2f2d98
MK
208{
209 if (!strcmp(var, "color.ui")) {
e269eb79 210 git_use_color_default = git_config_colorbool(var, value);
6b2f2d98
MK
211 return 0;
212 }
213
ef90d6d4 214 return git_default_config(var, value, cb);
6b2f2d98
MK
215}
216
becbdae8
JN
217void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
218{
219 if (*color)
220 fprintf(fp, "%s", color);
221 fprintf(fp, "%s", sb->buf);
222 if (*color)
223 fprintf(fp, "%s", GIT_COLOR_RESET);
224}
225
f26a0012 226static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
7c92fe0e
JK
227 va_list args, const char *trail)
228{
229 int r = 0;
230
231 if (*color)
f26a0012
KH
232 r += fprintf(fp, "%s", color);
233 r += vfprintf(fp, fmt, args);
7c92fe0e 234 if (*color)
dc6ebd4c 235 r += fprintf(fp, "%s", GIT_COLOR_RESET);
7c92fe0e 236 if (trail)
f26a0012 237 r += fprintf(fp, "%s", trail);
7c92fe0e
JK
238 return r;
239}
240
241
242
f26a0012 243int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
7c92fe0e
JK
244{
245 va_list args;
246 int r;
247 va_start(args, fmt);
f26a0012 248 r = color_vfprintf(fp, color, fmt, args, NULL);
7c92fe0e
JK
249 va_end(args);
250 return r;
251}
252
f26a0012 253int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
7c92fe0e
JK
254{
255 va_list args;
256 int r;
257 va_start(args, fmt);
f26a0012 258 r = color_vfprintf(fp, color, fmt, args, "\n");
7c92fe0e
JK
259 va_end(args);
260 return r;
261}
148135fc
JK
262
263int color_is_nil(const char *c)
264{
265 return !strcmp(c, "NIL");
266}