Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "color.h"
   3
   4int git_use_color_default = 0;
   5
   6static int parse_color(const char *name, int len)
   7{
   8        static const char * const color_names[] = {
   9                "normal", "black", "red", "green", "yellow",
  10                "blue", "magenta", "cyan", "white"
  11        };
  12        char *end;
  13        int i;
  14        for (i = 0; i < ARRAY_SIZE(color_names); i++) {
  15                const char *str = color_names[i];
  16                if (!strncasecmp(name, str, len) && !str[len])
  17                        return i - 1;
  18        }
  19        i = strtol(name, &end, 10);
  20        if (end - name == len && i >= -1 && i <= 255)
  21                return i;
  22        return -2;
  23}
  24
  25static int parse_attr(const char *name, int len)
  26{
  27        static const int attr_values[] = { 1, 2, 4, 5, 7 };
  28        static const char * const attr_names[] = {
  29                "bold", "dim", "ul", "blink", "reverse"
  30        };
  31        int i;
  32        for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
  33                const char *str = attr_names[i];
  34                if (!strncasecmp(name, str, len) && !str[len])
  35                        return attr_values[i];
  36        }
  37        return -1;
  38}
  39
  40void color_parse(const char *value, const char *var, char *dst)
  41{
  42        color_parse_mem(value, strlen(value), var, dst);
  43}
  44
  45void color_parse_mem(const char *value, int value_len, const char *var,
  46                char *dst)
  47{
  48        const char *ptr = value;
  49        int len = value_len;
  50        unsigned int attr = 0;
  51        int fg = -2;
  52        int bg = -2;
  53
  54        if (!strncasecmp(value, "reset", len)) {
  55                strcpy(dst, GIT_COLOR_RESET);
  56                return;
  57        }
  58
  59        /* [fg [bg]] [attr]... */
  60        while (len > 0) {
  61                const char *word = ptr;
  62                int val, wordlen = 0;
  63
  64                while (len > 0 && !isspace(word[wordlen])) {
  65                        wordlen++;
  66                        len--;
  67                }
  68
  69                ptr = word + wordlen;
  70                while (len > 0 && isspace(*ptr)) {
  71                        ptr++;
  72                        len--;
  73                }
  74
  75                val = parse_color(word, wordlen);
  76                if (val >= -1) {
  77                        if (fg == -2) {
  78                                fg = val;
  79                                continue;
  80                        }
  81                        if (bg == -2) {
  82                                bg = val;
  83                                continue;
  84                        }
  85                        goto bad;
  86                }
  87                val = parse_attr(word, wordlen);
  88                if (0 <= val)
  89                        attr |= (1 << val);
  90                else
  91                        goto bad;
  92        }
  93
  94        if (attr || fg >= 0 || bg >= 0) {
  95                int sep = 0;
  96                int i;
  97
  98                *dst++ = '\033';
  99                *dst++ = '[';
 100
 101                for (i = 0; attr; i++) {
 102                        unsigned bit = (1 << i);
 103                        if (!(attr & bit))
 104                                continue;
 105                        attr &= ~bit;
 106                        if (sep++)
 107                                *dst++ = ';';
 108                        *dst++ = '0' + i;
 109                }
 110                if (fg >= 0) {
 111                        if (sep++)
 112                                *dst++ = ';';
 113                        if (fg < 8) {
 114                                *dst++ = '3';
 115                                *dst++ = '0' + fg;
 116                        } else {
 117                                dst += sprintf(dst, "38;5;%d", fg);
 118                        }
 119                }
 120                if (bg >= 0) {
 121                        if (sep++)
 122                                *dst++ = ';';
 123                        if (bg < 8) {
 124                                *dst++ = '4';
 125                                *dst++ = '0' + bg;
 126                        } else {
 127                                dst += sprintf(dst, "48;5;%d", bg);
 128                        }
 129                }
 130                *dst++ = 'm';
 131        }
 132        *dst = 0;
 133        return;
 134bad:
 135        die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 136}
 137
 138int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 139{
 140        if (value) {
 141                if (!strcasecmp(value, "never"))
 142                        return 0;
 143                if (!strcasecmp(value, "always"))
 144                        return 1;
 145                if (!strcasecmp(value, "auto"))
 146                        goto auto_color;
 147        }
 148
 149        if (!var)
 150                return -1;
 151
 152        /* Missing or explicit false to turn off colorization */
 153        if (!git_config_bool(var, value))
 154                return 0;
 155
 156        /* any normal truth value defaults to 'auto' */
 157 auto_color:
 158        if (stdout_is_tty < 0)
 159                stdout_is_tty = isatty(1);
 160        if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 161                char *term = getenv("TERM");
 162                if (term && strcmp(term, "dumb"))
 163                        return 1;
 164        }
 165        return 0;
 166}
 167
 168int git_color_default_config(const char *var, const char *value, void *cb)
 169{
 170        if (!strcmp(var, "color.ui")) {
 171                git_use_color_default = git_config_colorbool(var, value, -1);
 172                return 0;
 173        }
 174
 175        return git_default_config(var, value, cb);
 176}
 177
 178static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 179                va_list args, const char *trail)
 180{
 181        int r = 0;
 182
 183        if (*color)
 184                r += fprintf(fp, "%s", color);
 185        r += vfprintf(fp, fmt, args);
 186        if (*color)
 187                r += fprintf(fp, "%s", GIT_COLOR_RESET);
 188        if (trail)
 189                r += fprintf(fp, "%s", trail);
 190        return r;
 191}
 192
 193
 194
 195int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 196{
 197        va_list args;
 198        int r;
 199        va_start(args, fmt);
 200        r = color_vfprintf(fp, color, fmt, args, NULL);
 201        va_end(args);
 202        return r;
 203}
 204
 205int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 206{
 207        va_list args;
 208        int r;
 209        va_start(args, fmt);
 210        r = color_vfprintf(fp, color, fmt, args, "\n");
 211        va_end(args);
 212        return r;
 213}