Andrew's git - gitweb.git/blob

e2a0a99164cf340eac0190974cad66eed335f547
   1#include "cache.h"
   2#include "color.h"
   3
   4static int git_use_color_default = GIT_COLOR_AUTO;
   5int color_stdout_is_tty = -1;
   6
   7/*
   8 * The list of available column colors.
   9 */
  10const 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 */
  27const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
  28
  29/* An individual foreground or background color. */
  30struct 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 */
  48static int match_word(const char *word, int len, const char *match)
  49{
  50        return !strncasecmp(word, match, len) && !match[len];
  51}
  52
  53static 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
  63static 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
 125static 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
 142int color_parse(const char *value, char *dst)
 143{
 144        return color_parse_mem(value, strlen(value), dst);
 145}
 146
 147#define COLOR_FOREGROUND '3'
 148#define COLOR_BACKGROUND '4'
 149
 150/*
 151 * Write the ANSI color codes for "c" to "out"; the string should
 152 * already have the ANSI escape code in it. "out" should have enough
 153 * space in it to fit any color.
 154 */
 155static char *color_output(char *out, const struct color *c, char type)
 156{
 157        switch (c->type) {
 158        case COLOR_UNSPECIFIED:
 159        case COLOR_NORMAL:
 160                break;
 161        case COLOR_ANSI:
 162                *out++ = type;
 163                *out++ = '0' + c->value;
 164                break;
 165        case COLOR_256:
 166                out += sprintf(out, "%c8;5;%d", type, c->value);
 167                break;
 168        case COLOR_RGB:
 169                out += sprintf(out, "%c8;2;%d;%d;%d", type,
 170                               c->red, c->green, c->blue);
 171                break;
 172        }
 173        return out;
 174}
 175
 176static int color_empty(const struct color *c)
 177{
 178        return c->type <= COLOR_NORMAL;
 179}
 180
 181int color_parse_mem(const char *value, int value_len, char *dst)
 182{
 183        const char *ptr = value;
 184        int len = value_len;
 185        unsigned int attr = 0;
 186        struct color fg = { COLOR_UNSPECIFIED };
 187        struct color bg = { COLOR_UNSPECIFIED };
 188
 189        if (!strncasecmp(value, "reset", len)) {
 190                strcpy(dst, GIT_COLOR_RESET);
 191                return 0;
 192        }
 193
 194        /* [fg [bg]] [attr]... */
 195        while (len > 0) {
 196                const char *word = ptr;
 197                struct color c;
 198                int val, wordlen = 0;
 199
 200                while (len > 0 && !isspace(word[wordlen])) {
 201                        wordlen++;
 202                        len--;
 203                }
 204
 205                ptr = word + wordlen;
 206                while (len > 0 && isspace(*ptr)) {
 207                        ptr++;
 208                        len--;
 209                }
 210
 211                if (!parse_color(&c, word, wordlen)) {
 212                        if (fg.type == COLOR_UNSPECIFIED) {
 213                                fg = c;
 214                                continue;
 215                        }
 216                        if (bg.type == COLOR_UNSPECIFIED) {
 217                                bg = c;
 218                                continue;
 219                        }
 220                        goto bad;
 221                }
 222                val = parse_attr(word, wordlen);
 223                if (0 <= val)
 224                        attr |= (1 << val);
 225                else
 226                        goto bad;
 227        }
 228
 229        if (attr || !color_empty(&fg) || !color_empty(&bg)) {
 230                int sep = 0;
 231                int i;
 232
 233                *dst++ = '\033';
 234                *dst++ = '[';
 235
 236                for (i = 0; attr; i++) {
 237                        unsigned bit = (1 << i);
 238                        if (!(attr & bit))
 239                                continue;
 240                        attr &= ~bit;
 241                        if (sep++)
 242                                *dst++ = ';';
 243                        dst += sprintf(dst, "%d", i);
 244                }
 245                if (!color_empty(&fg)) {
 246                        if (sep++)
 247                                *dst++ = ';';
 248                        dst = color_output(dst, &fg, COLOR_FOREGROUND);
 249                }
 250                if (!color_empty(&bg)) {
 251                        if (sep++)
 252                                *dst++ = ';';
 253                        dst = color_output(dst, &bg, COLOR_BACKGROUND);
 254                }
 255                *dst++ = 'm';
 256        }
 257        *dst = 0;
 258        return 0;
 259bad:
 260        return error(_("invalid color value: %.*s"), value_len, value);
 261}
 262
 263int git_config_colorbool(const char *var, const char *value)
 264{
 265        if (value) {
 266                if (!strcasecmp(value, "never"))
 267                        return 0;
 268                if (!strcasecmp(value, "always"))
 269                        return 1;
 270                if (!strcasecmp(value, "auto"))
 271                        return GIT_COLOR_AUTO;
 272        }
 273
 274        if (!var)
 275                return -1;
 276
 277        /* Missing or explicit false to turn off colorization */
 278        if (!git_config_bool(var, value))
 279                return 0;
 280
 281        /* any normal truth value defaults to 'auto' */
 282        return GIT_COLOR_AUTO;
 283}
 284
 285static int check_auto_color(void)
 286{
 287        if (color_stdout_is_tty < 0)
 288                color_stdout_is_tty = isatty(1);
 289        if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
 290                char *term = getenv("TERM");
 291                if (term && strcmp(term, "dumb"))
 292                        return 1;
 293        }
 294        return 0;
 295}
 296
 297int want_color(int var)
 298{
 299        static int want_auto = -1;
 300
 301        if (var < 0)
 302                var = git_use_color_default;
 303
 304        if (var == GIT_COLOR_AUTO) {
 305                if (want_auto < 0)
 306                        want_auto = check_auto_color();
 307                return want_auto;
 308        }
 309        return var;
 310}
 311
 312int git_color_config(const char *var, const char *value, void *cb)
 313{
 314        if (!strcmp(var, "color.ui")) {
 315                git_use_color_default = git_config_colorbool(var, value);
 316                return 0;
 317        }
 318
 319        return 0;
 320}
 321
 322int git_color_default_config(const char *var, const char *value, void *cb)
 323{
 324        if (git_color_config(var, value, cb) < 0)
 325                return -1;
 326
 327        return git_default_config(var, value, cb);
 328}
 329
 330void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 331{
 332        if (*color)
 333                fprintf(fp, "%s", color);
 334        fprintf(fp, "%s", sb->buf);
 335        if (*color)
 336                fprintf(fp, "%s", GIT_COLOR_RESET);
 337}
 338
 339static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 340                va_list args, const char *trail)
 341{
 342        int r = 0;
 343
 344        if (*color)
 345                r += fprintf(fp, "%s", color);
 346        r += vfprintf(fp, fmt, args);
 347        if (*color)
 348                r += fprintf(fp, "%s", GIT_COLOR_RESET);
 349        if (trail)
 350                r += fprintf(fp, "%s", trail);
 351        return r;
 352}
 353
 354
 355
 356int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 357{
 358        va_list args;
 359        int r;
 360        va_start(args, fmt);
 361        r = color_vfprintf(fp, color, fmt, args, NULL);
 362        va_end(args);
 363        return r;
 364}
 365
 366int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 367{
 368        va_list args;
 369        int r;
 370        va_start(args, fmt);
 371        r = color_vfprintf(fp, color, fmt, args, "\n");
 372        va_end(args);
 373        return r;
 374}
 375
 376int color_is_nil(const char *c)
 377{
 378        return !strcmp(c, "NIL");
 379}