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         unsigned int attr = 0;
  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 (0 <= val)
  91                         attr |= (1 << val);
  92                 else
  93                         goto bad;
  94         }
  95
  96         if (attr || fg >= 0 || bg >= 0) {
  97                 int sep = 0;
  98                 int i;
  99
 100                 *dst++ = '\033';
 101                 *dst++ = '[';
 102
 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 }
 139
 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         }
 150
 151         /* Missing or explicit false to turn off colorization */
 152         if (!git_config_bool(var, value))
 153                 return 0;
 154
 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 }
 166
 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         }
 173
 174         return git_default_config(var, value, cb);
 175 }
 176
 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;
 181
 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 }
 191
 192
 193
 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 }
 203
 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 }
 213
 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 }
 239
 240