color.c

   1 #include "cache.h"
   2 #include "color.h"
   3
   4 int git_use_color_default = 0;
   5
   6 static int parse_color(const char *name, int len)
   7 {
   8         static const char * const color_names[] = {
   9                 "normal", "black", "red", "green", "yellow",
  10                 "blue", "magenta", "cyan", "white"
  11         };
  12         char *end;
  13         int i;
  14         for (i = 0; i < ARRAY_SIZE(color_names); i++) {
  15                 const char *str = color_names[i];
  16                 if (!strncasecmp(name, str, len) && !str[len])
  17                         return i - 1;
  18         }
  19         i = strtol(name, &end, 10);
  20         if (end - name == len && i >= -1 && i <= 255)
  21                 return i;
  22         return -2;
  23 }
  24
  25 static int parse_attr(const char *name, int len)
  26 {
  27         static const int attr_values[] = { 1, 2, 4, 5, 7 };
  28         static const char * const attr_names[] = {
  29                 "bold", "dim", "ul", "blink", "reverse"
  30         };
  31         int i;
  32         for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
  33                 const char *str = attr_names[i];
  34                 if (!strncasecmp(name, str, len) && !str[len])
  35                         return attr_values[i];
  36         }
  37         return -1;
  38 }
  39
  40 void color_parse(const char *value, const char *var, char *dst)
  41 {
  42         color_parse_mem(value, strlen(value), var, dst);
  43 }
  44
  45 void color_parse_mem(const char *value, int value_len, const char *var,
  46                 char *dst)
  47 {
  48         const char *ptr = value;
  49         int len = value_len;
  50         int attr = -1;
  51         int fg = -2;
  52         int bg = -2;
  53
  54         if (!strncasecmp(value, "reset", len)) {
  55                 strcpy(dst, GIT_COLOR_RESET);
  56                 return;
  57         }
  58
  59         /* [fg [bg]] [attr] */
  60         while (len > 0) {
  61                 const char *word = ptr;
  62                 int val, wordlen = 0;
  63
  64                 while (len > 0 && !isspace(word[wordlen])) {
  65                         wordlen++;
  66                         len--;
  67                 }
  68
  69                 ptr = word + wordlen;
  70                 while (len > 0 && isspace(*ptr)) {
  71                         ptr++;
  72                         len--;
  73                 }
  74
  75                 val = parse_color(word, wordlen);
  76                 if (val >= -1) {
  77                         if (fg == -2) {
  78                                 fg = val;
  79                                 continue;
  80                         }
  81                         if (bg == -2) {
  82                                 bg = val;
  83                                 continue;
  84                         }
  85                         goto bad;
  86                 }
  87                 val = parse_attr(word, wordlen);
  88                 if (val < 0 || attr != -1)
  89                         goto bad;
  90                 attr = val;
  91         }
  92
  93         if (attr >= 0 || fg >= 0 || bg >= 0) {
  94                 int sep = 0;
  95
  96                 *dst++ = '\033';
  97                 *dst++ = '[';
  98                 if (attr >= 0) {
  99                         *dst++ = '0' + attr;
 100                         sep++;
 101                 }
 102                 if (fg >= 0) {
 103                         if (sep++)
 104                                 *dst++ = ';';
 105                         if (fg < 8) {
 106                                 *dst++ = '3';
 107                                 *dst++ = '0' + fg;
 108                         } else {
 109                                 dst += sprintf(dst, "38;5;%d", fg);
 110                         }
 111                 }
 112                 if (bg >= 0) {
 113                         if (sep++)
 114                                 *dst++ = ';';
 115                         if (bg < 8) {
 116                                 *dst++ = '4';
 117                                 *dst++ = '0' + bg;
 118                         } else {
 119                                 dst += sprintf(dst, "48;5;%d", bg);
 120                         }
 121                 }
 122                 *dst++ = 'm';
 123         }
 124         *dst = 0;
 125         return;
 126 bad:
 127         die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 128 }
 129
 130 int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 131 {
 132         if (value) {
 133                 if (!strcasecmp(value, "never"))
 134                         return 0;
 135                 if (!strcasecmp(value, "always"))
 136                         return 1;
 137                 if (!strcasecmp(value, "auto"))
 138                         goto auto_color;
 139         }
 140
 141         /* Missing or explicit false to turn off colorization */
 142         if (!git_config_bool(var, value))
 143                 return 0;
 144
 145         /* any normal truth value defaults to 'auto' */
 146  auto_color:
 147         if (stdout_is_tty < 0)
 148                 stdout_is_tty = isatty(1);
 149         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 150                 char *term = getenv("TERM");
 151                 if (term && strcmp(term, "dumb"))
 152                         return 1;
 153         }
 154         return 0;
 155 }
 156
 157 int git_color_default_config(const char *var, const char *value, void *cb)
 158 {
 159         if (!strcmp(var, "color.ui")) {
 160                 git_use_color_default = git_config_colorbool(var, value, -1);
 161                 return 0;
 162         }
 163
 164         return git_default_config(var, value, cb);
 165 }
 166
 167 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 168                 va_list args, const char *trail)
 169 {
 170         int r = 0;
 171
 172         if (*color)
 173                 r += fprintf(fp, "%s", color);
 174         r += vfprintf(fp, fmt, args);
 175         if (*color)
 176                 r += fprintf(fp, "%s", GIT_COLOR_RESET);
 177         if (trail)
 178                 r += fprintf(fp, "%s", trail);
 179         return r;
 180 }
 181
 182
 183
 184 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 185 {
 186         va_list args;
 187         int r;
 188         va_start(args, fmt);
 189         r = color_vfprintf(fp, color, fmt, args, NULL);
 190         va_end(args);
 191         return r;
 192 }
 193
 194 int color_fprintf_ln(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, "\n");
 200         va_end(args);
 201         return r;
 202 }
 203
 204 /*
 205  * This function splits the buffer by newlines and colors the lines individually.
 206  *
 207  * Returns 0 on success.
 208  */
 209 int color_fwrite_lines(FILE *fp, const char *color,
 210                 size_t count, const char *buf)
 211 {
 212         if (!*color)
 213                 return fwrite(buf, count, 1, fp) != 1;
 214         while (count) {
 215                 char *p = memchr(buf, '\n', count);
 216                 if (p != buf && (fputs(color, fp) < 0 ||
 217                                 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
 218                                 fputs(GIT_COLOR_RESET, fp) < 0))
 219                         return -1;
 220                 if (!p)
 221                         return 0;
 222                 if (fputc('\n', fp) < 0)
 223                         return -1;
 224                 count -= p + 1 - buf;
 225                 buf = p + 1;
 226         }
 227         return 0;
 228 }
 229
 230