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         color_parse_mem(value, strlen(value), var, dst);
  45 }
  46
  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         int attr = -1;
  53         int fg = -2;
  54         int bg = -2;
  55
  56         if (!strncasecmp(value, "reset", len)) {
  57                 strcpy(dst, "\033[m");
  58                 return;
  59         }
  60
  61         /* [fg [bg]] [attr] */
  62         while (len > 0) {
  63                 const char *word = ptr;
  64                 int val, wordlen = 0;
  65
  66                 while (len > 0 && !isspace(word[wordlen])) {
  67                         wordlen++;
  68                         len--;
  69                 }
  70
  71                 ptr = word + wordlen;
  72                 while (len > 0 && isspace(*ptr)) {
  73                         ptr++;
  74                         len--;
  75                 }
  76
  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 (val < 0 || attr != -1)
  91                         goto bad;
  92                 attr = val;
  93         }
  94
  95         if (attr >= 0 || fg >= 0 || bg >= 0) {
  96                 int sep = 0;
  97
  98                 *dst++ = '\033';
  99                 *dst++ = '[';
 100                 if (attr >= 0) {
 101                         *dst++ = '0' + attr;
 102                         sep++;
 103                 }
 104                 if (fg >= 0) {
 105                         if (sep++)
 106                                 *dst++ = ';';
 107                         if (fg < 8) {
 108                                 *dst++ = '3';
 109                                 *dst++ = '0' + fg;
 110                         } else {
 111                                 dst += sprintf(dst, "38;5;%d", fg);
 112                         }
 113                 }
 114                 if (bg >= 0) {
 115                         if (sep++)
 116                                 *dst++ = ';';
 117                         if (bg < 8) {
 118                                 *dst++ = '4';
 119                                 *dst++ = '0' + bg;
 120                         } else {
 121                                 dst += sprintf(dst, "48;5;%d", bg);
 122                         }
 123                 }
 124                 *dst++ = 'm';
 125         }
 126         *dst = 0;
 127         return;
 128 bad:
 129         die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 130 }
 131
 132 int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 133 {
 134         if (value) {
 135                 if (!strcasecmp(value, "never"))
 136                         return 0;
 137                 if (!strcasecmp(value, "always"))
 138                         return 1;
 139                 if (!strcasecmp(value, "auto"))
 140                         goto auto_color;
 141         }
 142
 143         /* Missing or explicit false to turn off colorization */
 144         if (!git_config_bool(var, value))
 145                 return 0;
 146
 147         /* any normal truth value defaults to 'auto' */
 148  auto_color:
 149         if (stdout_is_tty < 0)
 150                 stdout_is_tty = isatty(1);
 151         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 152                 char *term = getenv("TERM");
 153                 if (term && strcmp(term, "dumb"))
 154                         return 1;
 155         }
 156         return 0;
 157 }
 158
 159 int git_color_default_config(const char *var, const char *value, void *cb)
 160 {
 161         if (!strcmp(var, "color.ui")) {
 162                 git_use_color_default = git_config_colorbool(var, value, -1);
 163                 return 0;
 164         }
 165
 166         return git_default_config(var, value, cb);
 167 }
 168
 169 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 170                 va_list args, const char *trail)
 171 {
 172         int r = 0;
 173
 174         if (*color)
 175                 r += fprintf(fp, "%s", color);
 176         r += vfprintf(fp, fmt, args);
 177         if (*color)
 178                 r += fprintf(fp, "%s", COLOR_RESET);
 179         if (trail)
 180                 r += fprintf(fp, "%s", trail);
 181         return r;
 182 }
 183
 184
 185
 186 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 187 {
 188         va_list args;
 189         int r;
 190         va_start(args, fmt);
 191         r = color_vfprintf(fp, color, fmt, args, NULL);
 192         va_end(args);
 193         return r;
 194 }
 195
 196 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 197 {
 198         va_list args;
 199         int r;
 200         va_start(args, fmt);
 201         r = color_vfprintf(fp, color, fmt, args, "\n");
 202         va_end(args);
 203         return r;
 204 }
 205
 206 /*
 207  * This function splits the buffer by newlines and colors the lines individually.
 208  *
 209  * Returns 0 on success.
 210  */
 211 int color_fwrite_lines(FILE *fp, const char *color,
 212                 size_t count, const char *buf)
 213 {
 214         if (!*color)
 215                 return fwrite(buf, count, 1, fp) != 1;
 216         while (count) {
 217                 char *p = memchr(buf, '\n', count);
 218                 if (p != buf && (fputs(color, fp) < 0 ||
 219                                 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
 220                                 fputs(COLOR_RESET, fp) < 0))
 221                         return -1;
 222                 if (!p)
 223                         return 0;
 224                 if (fputc('\n', fp) < 0)
 225                         return -1;
 226                 count -= p + 1 - buf;
 227                 buf = p + 1;
 228         }
 229         return 0;
 230 }
 231
 232