color.c

   1 #include "cache.h"
   2 #include "color.h"
   3
   4 static int git_use_color_default = GIT_COLOR_AUTO;
   5 int color_stdout_is_tty = -1;
   6
   7 /*
   8  * The list of available column colors.
   9  */
  10 const char *column_colors_ansi[] = {
  11         GIT_COLOR_RED,
  12         GIT_COLOR_GREEN,
  13         GIT_COLOR_YELLOW,
  14         GIT_COLOR_BLUE,
  15         GIT_COLOR_MAGENTA,
  16         GIT_COLOR_CYAN,
  17         GIT_COLOR_BOLD_RED,
  18         GIT_COLOR_BOLD_GREEN,
  19         GIT_COLOR_BOLD_YELLOW,
  20         GIT_COLOR_BOLD_BLUE,
  21         GIT_COLOR_BOLD_MAGENTA,
  22         GIT_COLOR_BOLD_CYAN,
  23         GIT_COLOR_RESET,
  24 };
  25
  26 /* Ignore the RESET at the end when giving the size */
  27 const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
  28
  29 /* An individual foreground or background color. */
  30 struct color {
  31         enum {
  32                 COLOR_UNSPECIFIED = 0,
  33                 COLOR_NORMAL,
  34                 COLOR_ANSI, /* basic 0-7 ANSI colors */
  35                 COLOR_256,
  36                 COLOR_RGB
  37         } type;
  38         /* The numeric value for ANSI and 256-color modes */
  39         unsigned char value;
  40         /* 24-bit RGB color values */
  41         unsigned char red, green, blue;
  42 };
  43
  44 /*
  45  * "word" is a buffer of length "len"; does it match the NUL-terminated
  46  * "match" exactly?
  47  */
  48 static int match_word(const char *word, int len, const char *match)
  49 {
  50         return !strncasecmp(word, match, len) && !match[len];
  51 }
  52
  53 static int get_hex_color(const char *in, unsigned char *out)
  54 {
  55         unsigned int val;
  56         val = (hexval(in[0]) << 4) | hexval(in[1]);
  57         if (val & ~0xff)
  58                 return -1;
  59         *out = val;
  60         return 0;
  61 }
  62
  63 static int parse_color(struct color *out, const char *name, int len)
  64 {
  65         /* Positions in array must match ANSI color codes */
  66         static const char * const color_names[] = {
  67                 "black", "red", "green", "yellow",
  68                 "blue", "magenta", "cyan", "white"
  69         };
  70         char *end;
  71         int i;
  72         long val;
  73
  74         /* First try the special word "normal"... */
  75         if (match_word(name, len, "normal")) {
  76                 out->type = COLOR_NORMAL;
  77                 return 0;
  78         }
  79
  80         /* Try a 24-bit RGB value */
  81         if (len == 7 && name[0] == '#') {
  82                 if (!get_hex_color(name + 1, &out->red) &&
  83                     !get_hex_color(name + 3, &out->green) &&
  84                     !get_hex_color(name + 5, &out->blue)) {
  85                         out->type = COLOR_RGB;
  86                         return 0;
  87                 }
  88         }
  89
  90         /* Then pick from our human-readable color names... */
  91         for (i = 0; i < ARRAY_SIZE(color_names); i++) {
  92                 if (match_word(name, len, color_names[i])) {
  93                         out->type = COLOR_ANSI;
  94                         out->value = i;
  95                         return 0;
  96                 }
  97         }
  98
  99         /* And finally try a literal 256-color-mode number */
 100         val = strtol(name, &end, 10);
 101         if (end - name == len) {
 102                 /*
 103                  * Allow "-1" as an alias for "normal", but other negative
 104                  * numbers are bogus.
 105                  */
 106                 if (val < -1)
 107                         ; /* fall through to error */
 108                 else if (val < 0) {
 109                         out->type = COLOR_NORMAL;
 110                         return 0;
 111                 /* Rewrite low numbers as more-portable standard colors. */
 112                 } else if (val < 8) {
 113                         out->type = COLOR_ANSI;
 114                         out->value = val;
 115                 } else if (val < 256) {
 116                         out->type = COLOR_256;
 117                         out->value = val;
 118                         return 0;
 119                 }
 120         }
 121
 122         return -1;
 123 }
 124
 125 static int parse_attr(const char *name, int len)
 126 {
 127         static const int attr_values[] = { 1, 2, 4, 5, 7,
 128                                            22, 22, 24, 25, 27 };
 129         static const char * const attr_names[] = {
 130                 "bold", "dim", "ul", "blink", "reverse",
 131                 "nobold", "nodim", "noul", "noblink", "noreverse"
 132         };
 133         int i;
 134         for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
 135                 const char *str = attr_names[i];
 136                 if (!strncasecmp(name, str, len) && !str[len])
 137                         return attr_values[i];
 138         }
 139         return -1;
 140 }
 141
 142 int color_parse(const char *value, char *dst)
 143 {
 144         return color_parse_mem(value, strlen(value), dst);
 145 }
 146
 147 /*
 148  * Write the ANSI color codes for "c" to "out"; the string should
 149  * already have the ANSI escape code in it. "out" should have enough
 150  * space in it to fit any color.
 151  */
 152 static char *color_output(char *out, const struct color *c, char type)
 153 {
 154         switch (c->type) {
 155         case COLOR_UNSPECIFIED:
 156         case COLOR_NORMAL:
 157                 break;
 158         case COLOR_ANSI:
 159                 *out++ = type;
 160                 *out++ = '0' + c->value;
 161                 break;
 162         case COLOR_256:
 163                 out += sprintf(out, "%c8;5;%d", type, c->value);
 164                 break;
 165         case COLOR_RGB:
 166                 out += sprintf(out, "%c8;2;%d;%d;%d", type,
 167                                c->red, c->green, c->blue);
 168                 break;
 169         }
 170         return out;
 171 }
 172
 173 static int color_empty(const struct color *c)
 174 {
 175         return c->type <= COLOR_NORMAL;
 176 }
 177
 178 int color_parse_mem(const char *value, int value_len, char *dst)
 179 {
 180         const char *ptr = value;
 181         int len = value_len;
 182         unsigned int attr = 0;
 183         struct color fg = { COLOR_UNSPECIFIED };
 184         struct color bg = { COLOR_UNSPECIFIED };
 185
 186         if (!strncasecmp(value, "reset", len)) {
 187                 strcpy(dst, GIT_COLOR_RESET);
 188                 return 0;
 189         }
 190
 191         /* [fg [bg]] [attr]... */
 192         while (len > 0) {
 193                 const char *word = ptr;
 194                 struct color c;
 195                 int val, wordlen = 0;
 196
 197                 while (len > 0 && !isspace(word[wordlen])) {
 198                         wordlen++;
 199                         len--;
 200                 }
 201
 202                 ptr = word + wordlen;
 203                 while (len > 0 && isspace(*ptr)) {
 204                         ptr++;
 205                         len--;
 206                 }
 207
 208                 if (!parse_color(&c, word, wordlen)) {
 209                         if (fg.type == COLOR_UNSPECIFIED) {
 210                                 fg = c;
 211                                 continue;
 212                         }
 213                         if (bg.type == COLOR_UNSPECIFIED) {
 214                                 bg = c;
 215                                 continue;
 216                         }
 217                         goto bad;
 218                 }
 219                 val = parse_attr(word, wordlen);
 220                 if (0 <= val)
 221                         attr |= (1 << val);
 222                 else
 223                         goto bad;
 224         }
 225
 226         if (attr || !color_empty(&fg) || !color_empty(&bg)) {
 227                 int sep = 0;
 228                 int i;
 229
 230                 *dst++ = '\033';
 231                 *dst++ = '[';
 232
 233                 for (i = 0; attr; i++) {
 234                         unsigned bit = (1 << i);
 235                         if (!(attr & bit))
 236                                 continue;
 237                         attr &= ~bit;
 238                         if (sep++)
 239                                 *dst++ = ';';
 240                         dst += sprintf(dst, "%d", i);
 241                 }
 242                 if (!color_empty(&fg)) {
 243                         if (sep++)
 244                                 *dst++ = ';';
 245                         /* foreground colors are all in the 3x range */
 246                         dst = color_output(dst, &fg, '3');
 247                 }
 248                 if (!color_empty(&bg)) {
 249                         if (sep++)
 250                                 *dst++ = ';';
 251                         /* background colors are all in the 4x range */
 252                         dst = color_output(dst, &bg, '4');
 253                 }
 254                 *dst++ = 'm';
 255         }
 256         *dst = 0;
 257         return 0;
 258 bad:
 259         return error(_("invalid color value: %.*s"), value_len, value);
 260 }
 261
 262 int git_config_colorbool(const char *var, const char *value)
 263 {
 264         if (value) {
 265                 if (!strcasecmp(value, "never"))
 266                         return 0;
 267                 if (!strcasecmp(value, "always"))
 268                         return 1;
 269                 if (!strcasecmp(value, "auto"))
 270                         return GIT_COLOR_AUTO;
 271         }
 272
 273         if (!var)
 274                 return -1;
 275
 276         /* Missing or explicit false to turn off colorization */
 277         if (!git_config_bool(var, value))
 278                 return 0;
 279
 280         /* any normal truth value defaults to 'auto' */
 281         return GIT_COLOR_AUTO;
 282 }
 283
 284 static int check_auto_color(void)
 285 {
 286         if (color_stdout_is_tty < 0)
 287                 color_stdout_is_tty = isatty(1);
 288         if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
 289                 char *term = getenv("TERM");
 290                 if (term && strcmp(term, "dumb"))
 291                         return 1;
 292         }
 293         return 0;
 294 }
 295
 296 int want_color(int var)
 297 {
 298         static int want_auto = -1;
 299
 300         if (var < 0)
 301                 var = git_use_color_default;
 302
 303         if (var == GIT_COLOR_AUTO) {
 304                 if (want_auto < 0)
 305                         want_auto = check_auto_color();
 306                 return want_auto;
 307         }
 308         return var;
 309 }
 310
 311 int git_color_config(const char *var, const char *value, void *cb)
 312 {
 313         if (!strcmp(var, "color.ui")) {
 314                 git_use_color_default = git_config_colorbool(var, value);
 315                 return 0;
 316         }
 317
 318         return 0;
 319 }
 320
 321 int git_color_default_config(const char *var, const char *value, void *cb)
 322 {
 323         if (git_color_config(var, value, cb) < 0)
 324                 return -1;
 325
 326         return git_default_config(var, value, cb);
 327 }
 328
 329 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 330 {
 331         if (*color)
 332                 fprintf(fp, "%s", color);
 333         fprintf(fp, "%s", sb->buf);
 334         if (*color)
 335                 fprintf(fp, "%s", GIT_COLOR_RESET);
 336 }
 337
 338 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 339                 va_list args, const char *trail)
 340 {
 341         int r = 0;
 342
 343         if (*color)
 344                 r += fprintf(fp, "%s", color);
 345         r += vfprintf(fp, fmt, args);
 346         if (*color)
 347                 r += fprintf(fp, "%s", GIT_COLOR_RESET);
 348         if (trail)
 349                 r += fprintf(fp, "%s", trail);
 350         return r;
 351 }
 352
 353
 354
 355 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 356 {
 357         va_list args;
 358         int r;
 359         va_start(args, fmt);
 360         r = color_vfprintf(fp, color, fmt, args, NULL);
 361         va_end(args);
 362         return r;
 363 }
 364
 365 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 366 {
 367         va_list args;
 368         int r;
 369         va_start(args, fmt);
 370         r = color_vfprintf(fp, color, fmt, args, "\n");
 371         va_end(args);
 372         return r;
 373 }
 374
 375 int color_is_nil(const char *c)
 376 {
 377         return !strcmp(c, "NIL");
 378 }