Andrew's git - gitweb.git/blob

3afda9d9dc20b184f1bc1450c0a734c67fc0bfda
   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        } type;
  37        /* The numeric value for ANSI and 256-color modes */
  38        unsigned char value;
  39};
  40
  41/*
  42 * "word" is a buffer of length "len"; does it match the NUL-terminated
  43 * "match" exactly?
  44 */
  45static int match_word(const char *word, int len, const char *match)
  46{
  47        return !strncasecmp(word, match, len) && !match[len];
  48}
  49
  50static int parse_color(struct color *out, const char *name, int len)
  51{
  52        /* Positions in array must match ANSI color codes */
  53        static const char * const color_names[] = {
  54                "black", "red", "green", "yellow",
  55                "blue", "magenta", "cyan", "white"
  56        };
  57        char *end;
  58        int i;
  59        long val;
  60
  61        /* First try the special word "normal"... */
  62        if (match_word(name, len, "normal")) {
  63                out->type = COLOR_NORMAL;
  64                return 0;
  65        }
  66
  67        /* Then pick from our human-readable color names... */
  68        for (i = 0; i < ARRAY_SIZE(color_names); i++) {
  69                if (match_word(name, len, color_names[i])) {
  70                        out->type = COLOR_ANSI;
  71                        out->value = i;
  72                        return 0;
  73                }
  74        }
  75
  76        /* And finally try a literal 256-color-mode number */
  77        val = strtol(name, &end, 10);
  78        if (end - name == len) {
  79                /*
  80                 * Allow "-1" as an alias for "normal", but other negative
  81                 * numbers are bogus.
  82                 */
  83                if (val < -1)
  84                        ; /* fall through to error */
  85                else if (val < 0) {
  86                        out->type = COLOR_NORMAL;
  87                        return 0;
  88                /* Rewrite low numbers as more-portable standard colors. */
  89                } else if (val < 8) {
  90                        out->type = COLOR_ANSI;
  91                        out->value = val;
  92                } else if (val < 256) {
  93                        out->type = COLOR_256;
  94                        out->value = val;
  95                        return 0;
  96                }
  97        }
  98
  99        return -1;
 100}
 101
 102static int parse_attr(const char *name, int len)
 103{
 104        static const int attr_values[] = { 1, 2, 4, 5, 7 };
 105        static const char * const attr_names[] = {
 106                "bold", "dim", "ul", "blink", "reverse"
 107        };
 108        int i;
 109        for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
 110                const char *str = attr_names[i];
 111                if (!strncasecmp(name, str, len) && !str[len])
 112                        return attr_values[i];
 113        }
 114        return -1;
 115}
 116
 117int color_parse(const char *value, char *dst)
 118{
 119        return color_parse_mem(value, strlen(value), dst);
 120}
 121
 122#define COLOR_FOREGROUND '3'
 123#define COLOR_BACKGROUND '4'
 124
 125/*
 126 * Write the ANSI color codes for "c" to "out"; the string should
 127 * already have the ANSI escape code in it. "out" should have enough
 128 * space in it to fit any color.
 129 */
 130static char *color_output(char *out, const struct color *c, char type)
 131{
 132        switch (c->type) {
 133        case COLOR_UNSPECIFIED:
 134        case COLOR_NORMAL:
 135                break;
 136        case COLOR_ANSI:
 137                *out++ = type;
 138                *out++ = '0' + c->value;
 139                break;
 140        case COLOR_256:
 141                out += sprintf(out, "%c8;5;%d", type, c->value);
 142                break;
 143        }
 144        return out;
 145}
 146
 147static int color_empty(const struct color *c)
 148{
 149        return c->type <= COLOR_NORMAL;
 150}
 151
 152int color_parse_mem(const char *value, int value_len, char *dst)
 153{
 154        const char *ptr = value;
 155        int len = value_len;
 156        unsigned int attr = 0;
 157        struct color fg = { COLOR_UNSPECIFIED };
 158        struct color bg = { COLOR_UNSPECIFIED };
 159
 160        if (!strncasecmp(value, "reset", len)) {
 161                strcpy(dst, GIT_COLOR_RESET);
 162                return 0;
 163        }
 164
 165        /* [fg [bg]] [attr]... */
 166        while (len > 0) {
 167                const char *word = ptr;
 168                struct color c;
 169                int val, wordlen = 0;
 170
 171                while (len > 0 && !isspace(word[wordlen])) {
 172                        wordlen++;
 173                        len--;
 174                }
 175
 176                ptr = word + wordlen;
 177                while (len > 0 && isspace(*ptr)) {
 178                        ptr++;
 179                        len--;
 180                }
 181
 182                if (!parse_color(&c, word, wordlen)) {
 183                        if (fg.type == COLOR_UNSPECIFIED) {
 184                                fg = c;
 185                                continue;
 186                        }
 187                        if (bg.type == COLOR_UNSPECIFIED) {
 188                                bg = c;
 189                                continue;
 190                        }
 191                        goto bad;
 192                }
 193                val = parse_attr(word, wordlen);
 194                if (0 <= val)
 195                        attr |= (1 << val);
 196                else
 197                        goto bad;
 198        }
 199
 200        if (attr || !color_empty(&fg) || !color_empty(&bg)) {
 201                int sep = 0;
 202                int i;
 203
 204                *dst++ = '\033';
 205                *dst++ = '[';
 206
 207                for (i = 0; attr; i++) {
 208                        unsigned bit = (1 << i);
 209                        if (!(attr & bit))
 210                                continue;
 211                        attr &= ~bit;
 212                        if (sep++)
 213                                *dst++ = ';';
 214                        *dst++ = '0' + i;
 215                }
 216                if (!color_empty(&fg)) {
 217                        if (sep++)
 218                                *dst++ = ';';
 219                        dst = color_output(dst, &fg, COLOR_FOREGROUND);
 220                }
 221                if (!color_empty(&bg)) {
 222                        if (sep++)
 223                                *dst++ = ';';
 224                        dst = color_output(dst, &bg, COLOR_BACKGROUND);
 225                }
 226                *dst++ = 'm';
 227        }
 228        *dst = 0;
 229        return 0;
 230bad:
 231        return error(_("invalid color value: %.*s"), value_len, value);
 232}
 233
 234int git_config_colorbool(const char *var, const char *value)
 235{
 236        if (value) {
 237                if (!strcasecmp(value, "never"))
 238                        return 0;
 239                if (!strcasecmp(value, "always"))
 240                        return 1;
 241                if (!strcasecmp(value, "auto"))
 242                        return GIT_COLOR_AUTO;
 243        }
 244
 245        if (!var)
 246                return -1;
 247
 248        /* Missing or explicit false to turn off colorization */
 249        if (!git_config_bool(var, value))
 250                return 0;
 251
 252        /* any normal truth value defaults to 'auto' */
 253        return GIT_COLOR_AUTO;
 254}
 255
 256static int check_auto_color(void)
 257{
 258        if (color_stdout_is_tty < 0)
 259                color_stdout_is_tty = isatty(1);
 260        if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
 261                char *term = getenv("TERM");
 262                if (term && strcmp(term, "dumb"))
 263                        return 1;
 264        }
 265        return 0;
 266}
 267
 268int want_color(int var)
 269{
 270        static int want_auto = -1;
 271
 272        if (var < 0)
 273                var = git_use_color_default;
 274
 275        if (var == GIT_COLOR_AUTO) {
 276                if (want_auto < 0)
 277                        want_auto = check_auto_color();
 278                return want_auto;
 279        }
 280        return var;
 281}
 282
 283int git_color_config(const char *var, const char *value, void *cb)
 284{
 285        if (!strcmp(var, "color.ui")) {
 286                git_use_color_default = git_config_colorbool(var, value);
 287                return 0;
 288        }
 289
 290        return 0;
 291}
 292
 293int git_color_default_config(const char *var, const char *value, void *cb)
 294{
 295        if (git_color_config(var, value, cb) < 0)
 296                return -1;
 297
 298        return git_default_config(var, value, cb);
 299}
 300
 301void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 302{
 303        if (*color)
 304                fprintf(fp, "%s", color);
 305        fprintf(fp, "%s", sb->buf);
 306        if (*color)
 307                fprintf(fp, "%s", GIT_COLOR_RESET);
 308}
 309
 310static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 311                va_list args, const char *trail)
 312{
 313        int r = 0;
 314
 315        if (*color)
 316                r += fprintf(fp, "%s", color);
 317        r += vfprintf(fp, fmt, args);
 318        if (*color)
 319                r += fprintf(fp, "%s", GIT_COLOR_RESET);
 320        if (trail)
 321                r += fprintf(fp, "%s", trail);
 322        return r;
 323}
 324
 325
 326
 327int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 328{
 329        va_list args;
 330        int r;
 331        va_start(args, fmt);
 332        r = color_vfprintf(fp, color, fmt, args, NULL);
 333        va_end(args);
 334        return r;
 335}
 336
 337int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 338{
 339        va_list args;
 340        int r;
 341        va_start(args, fmt);
 342        r = color_vfprintf(fp, color, fmt, args, "\n");
 343        va_end(args);
 344        return r;
 345}
 346
 347int color_is_nil(const char *c)
 348{
 349        return !strcmp(c, "NIL");
 350}