1 #include "cache.h"
2 #include "color.h"
4 #define COLOR_RESET "\033[m"
6 int git_use_color_default = 0;
8 static int parse_color(const char *name, int len)
9 {
10 static const char * const color_names[] = {
11 "normal", "black", "red", "green", "yellow",
12 "blue", "magenta", "cyan", "white"
13 };
14 char *end;
15 int i;
16 for (i = 0; i < ARRAY_SIZE(color_names); i++) {
17 const char *str = color_names[i];
18 if (!strncasecmp(name, str, len) && !str[len])
19 return i - 1;
20 }
21 i = strtol(name, &end, 10);
22 if (end - name == len && i >= -1 && i <= 255)
23 return i;
24 return -2;
25 }
27 static int parse_attr(const char *name, int len)
28 {
29 static const int attr_values[] = { 1, 2, 4, 5, 7 };
30 static const char * const attr_names[] = {
31 "bold", "dim", "ul", "blink", "reverse"
32 };
33 int i;
34 for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
35 const char *str = attr_names[i];
36 if (!strncasecmp(name, str, len) && !str[len])
37 return attr_values[i];
38 }
39 return -1;
40 }
42 void color_parse(const char *value, const char *var, char *dst)
43 {
44 color_parse_mem(value, strlen(value), var, dst);
45 }
47 void color_parse_mem(const char *value, int value_len, const char *var,
48 char *dst)
49 {
50 const char *ptr = value;
51 int len = value_len;
52 unsigned int attr = 0;
53 int fg = -2;
54 int bg = -2;
56 if (!strncasecmp(value, "reset", len)) {
57 strcpy(dst, "\033[m");
58 return;
59 }
61 /* [fg [bg]] [attr]... */
62 while (len > 0) {
63 const char *word = ptr;
64 int val, wordlen = 0;
66 while (len > 0 && !isspace(word[wordlen])) {
67 wordlen++;
68 len--;
69 }
71 ptr = word + wordlen;
72 while (len > 0 && isspace(*ptr)) {
73 ptr++;
74 len--;
75 }
77 val = parse_color(word, wordlen);
78 if (val >= -1) {
79 if (fg == -2) {
80 fg = val;
81 continue;
82 }
83 if (bg == -2) {
84 bg = val;
85 continue;
86 }
87 goto bad;
88 }
89 val = parse_attr(word, wordlen);
90 if (0 <= val)
91 attr |= (1 << val);
92 else
93 goto bad;
94 }
96 if (attr || fg >= 0 || bg >= 0) {
97 int sep = 0;
98 int i;
100 *dst++ = '\033';
101 *dst++ = '[';
103 for (i = 0; attr; i++) {
104 unsigned bit = (1 << i);
105 if (!(attr & bit))
106 continue;
107 attr &= ~bit;
108 if (sep++)
109 *dst++ = ';';
110 *dst++ = '0' + i;
111 }
112 if (fg >= 0) {
113 if (sep++)
114 *dst++ = ';';
115 if (fg < 8) {
116 *dst++ = '3';
117 *dst++ = '0' + fg;
118 } else {
119 dst += sprintf(dst, "38;5;%d", fg);
120 }
121 }
122 if (bg >= 0) {
123 if (sep++)
124 *dst++ = ';';
125 if (bg < 8) {
126 *dst++ = '4';
127 *dst++ = '0' + bg;
128 } else {
129 dst += sprintf(dst, "48;5;%d", bg);
130 }
131 }
132 *dst++ = 'm';
133 }
134 *dst = 0;
135 return;
136 bad:
137 die("bad color value '%.*s' for variable '%s'", value_len, value, var);
138 }
140 int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
141 {
142 if (value) {
143 if (!strcasecmp(value, "never"))
144 return 0;
145 if (!strcasecmp(value, "always"))
146 return 1;
147 if (!strcasecmp(value, "auto"))
148 goto auto_color;
149 }
151 /* Missing or explicit false to turn off colorization */
152 if (!git_config_bool(var, value))
153 return 0;
155 /* any normal truth value defaults to 'auto' */
156 auto_color:
157 if (stdout_is_tty < 0)
158 stdout_is_tty = isatty(1);
159 if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
160 char *term = getenv("TERM");
161 if (term && strcmp(term, "dumb"))
162 return 1;
163 }
164 return 0;
165 }
167 int git_color_default_config(const char *var, const char *value, void *cb)
168 {
169 if (!strcmp(var, "color.ui")) {
170 git_use_color_default = git_config_colorbool(var, value, -1);
171 return 0;
172 }
174 return git_default_config(var, value, cb);
175 }
177 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
178 va_list args, const char *trail)
179 {
180 int r = 0;
182 if (*color)
183 r += fprintf(fp, "%s", color);
184 r += vfprintf(fp, fmt, args);
185 if (*color)
186 r += fprintf(fp, "%s", COLOR_RESET);
187 if (trail)
188 r += fprintf(fp, "%s", trail);
189 return r;
190 }
194 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
195 {
196 va_list args;
197 int r;
198 va_start(args, fmt);
199 r = color_vfprintf(fp, color, fmt, args, NULL);
200 va_end(args);
201 return r;
202 }
204 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
205 {
206 va_list args;
207 int r;
208 va_start(args, fmt);
209 r = color_vfprintf(fp, color, fmt, args, "\n");
210 va_end(args);
211 return r;
212 }
214 /*
215 * This function splits the buffer by newlines and colors the lines individually.
216 *
217 * Returns 0 on success.
218 */
219 int color_fwrite_lines(FILE *fp, const char *color,
220 size_t count, const char *buf)
221 {
222 if (!*color)
223 return fwrite(buf, count, 1, fp) != 1;
224 while (count) {
225 char *p = memchr(buf, '\n', count);
226 if (p != buf && (fputs(color, fp) < 0 ||
227 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
228 fputs(COLOR_RESET, fp) < 0))
229 return -1;
230 if (!p)
231 return 0;
232 if (fputc('\n', fp) < 0)
233 return -1;
234 count -= p + 1 - buf;
235 buf = p + 1;
236 }
237 return 0;
238 }