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                         return 0;
 116                 } else if (val < 256) {
 117                         out->type = COLOR_256;
 118                         out->value = val;
 119                         return 0;
 120                 }
 121         }
 122
 123         return -1;
 124 }
 125
 126 static int parse_attr(const char *name, size_t len)
 127 {
 128         static const struct {
 129                 const char *name;
 130                 size_t len;
 131                 int val, neg;
 132         } attrs[] = {
 133 #define ATTR(x, val, neg) { (x), sizeof(x)-1, (val), (neg) }
 134                 ATTR("bold",      1, 22),
 135                 ATTR("dim",       2, 22),
 136                 ATTR("italic",    3, 23),
 137                 ATTR("ul",        4, 24),
 138                 ATTR("blink",     5, 25),
 139                 ATTR("reverse",   7, 27),
 140                 ATTR("strike",    9, 29)
 141 #undef ATTR
 142         };
 143         int negate = 0;
 144         int i;
 145
 146         if (skip_prefix_mem(name, len, "no", &name, &len)) {
 147                 skip_prefix_mem(name, len, "-", &name, &len);
 148                 negate = 1;
 149         }
 150
 151         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
 152                 if (attrs[i].len == len && !memcmp(attrs[i].name, name, len))
 153                         return negate ? attrs[i].neg : attrs[i].val;
 154         }
 155         return -1;
 156 }
 157
 158 int color_parse(const char *value, char *dst)
 159 {
 160         return color_parse_mem(value, strlen(value), dst);
 161 }
 162
 163 void color_set(char *dst, const char *color_bytes)
 164 {
 165         xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
 166 }
 167
 168 /*
 169  * Write the ANSI color codes for "c" to "out"; the string should
 170  * already have the ANSI escape code in it. "out" should have enough
 171  * space in it to fit any color.
 172  */
 173 static char *color_output(char *out, int len, const struct color *c, char type)
 174 {
 175         switch (c->type) {
 176         case COLOR_UNSPECIFIED:
 177         case COLOR_NORMAL:
 178                 break;
 179         case COLOR_ANSI:
 180                 if (len < 2)
 181                         die("BUG: color parsing ran out of space");
 182                 *out++ = type;
 183                 *out++ = '0' + c->value;
 184                 break;
 185         case COLOR_256:
 186                 out += xsnprintf(out, len, "%c8;5;%d", type, c->value);
 187                 break;
 188         case COLOR_RGB:
 189                 out += xsnprintf(out, len, "%c8;2;%d;%d;%d", type,
 190                                  c->red, c->green, c->blue);
 191                 break;
 192         }
 193         return out;
 194 }
 195
 196 static int color_empty(const struct color *c)
 197 {
 198         return c->type <= COLOR_NORMAL;
 199 }
 200
 201 int color_parse_mem(const char *value, int value_len, char *dst)
 202 {
 203         const char *ptr = value;
 204         int len = value_len;
 205         char *end = dst + COLOR_MAXLEN;
 206         unsigned int attr = 0;
 207         struct color fg = { COLOR_UNSPECIFIED };
 208         struct color bg = { COLOR_UNSPECIFIED };
 209
 210         if (!len)
 211                 return -1;
 212
 213         if (!strncasecmp(value, "reset", len)) {
 214                 xsnprintf(dst, end - dst, GIT_COLOR_RESET);
 215                 return 0;
 216         }
 217
 218         /* [fg [bg]] [attr]... */
 219         while (len > 0) {
 220                 const char *word = ptr;
 221                 struct color c;
 222                 int val, wordlen = 0;
 223
 224                 while (len > 0 && !isspace(word[wordlen])) {
 225                         wordlen++;
 226                         len--;
 227                 }
 228
 229                 ptr = word + wordlen;
 230                 while (len > 0 && isspace(*ptr)) {
 231                         ptr++;
 232                         len--;
 233                 }
 234
 235                 if (!parse_color(&c, word, wordlen)) {
 236                         if (fg.type == COLOR_UNSPECIFIED) {
 237                                 fg = c;
 238                                 continue;
 239                         }
 240                         if (bg.type == COLOR_UNSPECIFIED) {
 241                                 bg = c;
 242                                 continue;
 243                         }
 244                         goto bad;
 245                 }
 246                 val = parse_attr(word, wordlen);
 247                 if (0 <= val)
 248                         attr |= (1 << val);
 249                 else
 250                         goto bad;
 251         }
 252
 253 #undef OUT
 254 #define OUT(x) do { \
 255         if (dst == end) \
 256                 die("BUG: color parsing ran out of space"); \
 257         *dst++ = (x); \
 258 } while(0)
 259
 260         if (attr || !color_empty(&fg) || !color_empty(&bg)) {
 261                 int sep = 0;
 262                 int i;
 263
 264                 OUT('\033');
 265                 OUT('[');
 266
 267                 for (i = 0; attr; i++) {
 268                         unsigned bit = (1 << i);
 269                         if (!(attr & bit))
 270                                 continue;
 271                         attr &= ~bit;
 272                         if (sep++)
 273                                 OUT(';');
 274                         dst += xsnprintf(dst, end - dst, "%d", i);
 275                 }
 276                 if (!color_empty(&fg)) {
 277                         if (sep++)
 278                                 OUT(';');
 279                         /* foreground colors are all in the 3x range */
 280                         dst = color_output(dst, end - dst, &fg, '3');
 281                 }
 282                 if (!color_empty(&bg)) {
 283                         if (sep++)
 284                                 OUT(';');
 285                         /* background colors are all in the 4x range */
 286                         dst = color_output(dst, end - dst, &bg, '4');
 287                 }
 288                 OUT('m');
 289         }
 290         OUT(0);
 291         return 0;
 292 bad:
 293         return error(_("invalid color value: %.*s"), value_len, value);
 294 #undef OUT
 295 }
 296
 297 int git_config_colorbool(const char *var, const char *value)
 298 {
 299         if (value) {
 300                 if (!strcasecmp(value, "never"))
 301                         return 0;
 302                 if (!strcasecmp(value, "always"))
 303                         return 1;
 304                 if (!strcasecmp(value, "auto"))
 305                         return GIT_COLOR_AUTO;
 306         }
 307
 308         if (!var)
 309                 return -1;
 310
 311         /* Missing or explicit false to turn off colorization */
 312         if (!git_config_bool(var, value))
 313                 return 0;
 314
 315         /* any normal truth value defaults to 'auto' */
 316         return GIT_COLOR_AUTO;
 317 }
 318
 319 static int check_auto_color(void)
 320 {
 321         if (color_stdout_is_tty < 0)
 322                 color_stdout_is_tty = isatty(1);
 323         if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
 324                 char *term = getenv("TERM");
 325                 if (term && strcmp(term, "dumb"))
 326                         return 1;
 327         }
 328         return 0;
 329 }
 330
 331 int want_color(int var)
 332 {
 333         static int want_auto = -1;
 334
 335         if (var < 0)
 336                 var = git_use_color_default;
 337
 338         if (var == GIT_COLOR_AUTO) {
 339                 if (want_auto < 0)
 340                         want_auto = check_auto_color();
 341                 return want_auto;
 342         }
 343         return var;
 344 }
 345
 346 int git_color_config(const char *var, const char *value, void *cb)
 347 {
 348         if (!strcmp(var, "color.ui")) {
 349                 git_use_color_default = git_config_colorbool(var, value);
 350                 return 0;
 351         }
 352
 353         return 0;
 354 }
 355
 356 int git_color_default_config(const char *var, const char *value, void *cb)
 357 {
 358         if (git_color_config(var, value, cb) < 0)
 359                 return -1;
 360
 361         return git_default_config(var, value, cb);
 362 }
 363
 364 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 365 {
 366         if (*color)
 367                 fprintf(fp, "%s", color);
 368         fprintf(fp, "%s", sb->buf);
 369         if (*color)
 370                 fprintf(fp, "%s", GIT_COLOR_RESET);
 371 }
 372
 373 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 374                 va_list args, const char *trail)
 375 {
 376         int r = 0;
 377
 378         if (*color)
 379                 r += fprintf(fp, "%s", color);
 380         r += vfprintf(fp, fmt, args);
 381         if (*color)
 382                 r += fprintf(fp, "%s", GIT_COLOR_RESET);
 383         if (trail)
 384                 r += fprintf(fp, "%s", trail);
 385         return r;
 386 }
 387
 388
 389
 390 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 391 {
 392         va_list args;
 393         int r;
 394         va_start(args, fmt);
 395         r = color_vfprintf(fp, color, fmt, args, NULL);
 396         va_end(args);
 397         return r;
 398 }
 399
 400 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 401 {
 402         va_list args;
 403         int r;
 404         va_start(args, fmt);
 405         r = color_vfprintf(fp, color, fmt, args, "\n");
 406         va_end(args);
 407         return r;
 408 }
 409
 410 int color_is_nil(const char *c)
 411 {
 412         return !strcmp(c, "NIL");
 413 }