color.c

   1 #include "cache.h"
   2 #include "color.h"
   3
   4 #define COLOR_RESET "\033[m"
   5
   6 int git_use_color_default = 0;
   7
   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 }
  26
  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 }
  41
  42 void color_parse(const char *value, const char *var, char *dst)
  43 {
  44         const char *ptr = value;
  45         int attr = -1;
  46         int fg = -2;
  47         int bg = -2;
  48
  49         if (!strcasecmp(value, "reset")) {
  50                 strcpy(dst, "\033[m");
  51                 return;
  52         }
  53
  54         /* [fg [bg]] [attr] */
  55         while (*ptr) {
  56                 const char *word = ptr;
  57                 int val, len = 0;
  58
  59                 while (word[len] && !isspace(word[len]))
  60                         len++;
  61
  62                 ptr = word + len;
  63                 while (*ptr && isspace(*ptr))
  64                         ptr++;
  65
  66                 val = parse_color(word, len);
  67                 if (val >= -1) {
  68                         if (fg == -2) {
  69                                 fg = val;
  70                                 continue;
  71                         }
  72                         if (bg == -2) {
  73                                 bg = val;
  74                                 continue;
  75                         }
  76                         goto bad;
  77                 }
  78                 val = parse_attr(word, len);
  79                 if (val < 0 || attr != -1)
  80                         goto bad;
  81                 attr = val;
  82         }
  83
  84         if (attr >= 0 || fg >= 0 || bg >= 0) {
  85                 int sep = 0;
  86
  87                 *dst++ = '\033';
  88                 *dst++ = '[';
  89                 if (attr >= 0) {
  90                         *dst++ = '0' + attr;
  91                         sep++;
  92                 }
  93                 if (fg >= 0) {
  94                         if (sep++)
  95                                 *dst++ = ';';
  96                         if (fg < 8) {
  97                                 *dst++ = '3';
  98                                 *dst++ = '0' + fg;
  99                         } else {
 100                                 dst += sprintf(dst, "38;5;%d", fg);
 101                         }
 102                 }
 103                 if (bg >= 0) {
 104                         if (sep++)
 105                                 *dst++ = ';';
 106                         if (bg < 8) {
 107                                 *dst++ = '4';
 108                                 *dst++ = '0' + bg;
 109                         } else {
 110                                 dst += sprintf(dst, "48;5;%d", bg);
 111                         }
 112                 }
 113                 *dst++ = 'm';
 114         }
 115         *dst = 0;
 116         return;
 117 bad:
 118         die("bad config value '%s' for variable '%s'", value, var);
 119 }
 120
 121 int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 122 {
 123         if (value) {
 124                 if (!strcasecmp(value, "never"))
 125                         return 0;
 126                 if (!strcasecmp(value, "always"))
 127                         return 1;
 128                 if (!strcasecmp(value, "auto"))
 129                         goto auto_color;
 130         }
 131
 132         /* Missing or explicit false to turn off colorization */
 133         if (!git_config_bool(var, value))
 134                 return 0;
 135
 136         /* any normal truth value defaults to 'auto' */
 137  auto_color:
 138         if (stdout_is_tty < 0)
 139                 stdout_is_tty = isatty(1);
 140         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 141                 char *term = getenv("TERM");
 142                 if (term && strcmp(term, "dumb"))
 143                         return 1;
 144         }
 145         return 0;
 146 }
 147
 148 int git_color_default_config(const char *var, const char *value, void *cb)
 149 {
 150         if (!strcmp(var, "color.ui")) {
 151                 git_use_color_default = git_config_colorbool(var, value, -1);
 152                 return 0;
 153         }
 154
 155         return git_default_config(var, value, cb);
 156 }
 157
 158 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 159                 va_list args, const char *trail)
 160 {
 161         int r = 0;
 162
 163         if (*color)
 164                 r += fprintf(fp, "%s", color);
 165         r += vfprintf(fp, fmt, args);
 166         if (*color)
 167                 r += fprintf(fp, "%s", COLOR_RESET);
 168         if (trail)
 169                 r += fprintf(fp, "%s", trail);
 170         return r;
 171 }
 172
 173
 174
 175 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 176 {
 177         va_list args;
 178         int r;
 179         va_start(args, fmt);
 180         r = color_vfprintf(fp, color, fmt, args, NULL);
 181         va_end(args);
 182         return r;
 183 }
 184
 185 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 186 {
 187         va_list args;
 188         int r;
 189         va_start(args, fmt);
 190         r = color_vfprintf(fp, color, fmt, args, "\n");
 191         va_end(args);
 192         return r;
 193 }