color.c

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