Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "color.h"
   3
   4#define COLOR_RESET "\033[m"
   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 (*name && !*end && 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        const char *ptr = value;
  43        int attr = -1;
  44        int fg = -2;
  45        int bg = -2;
  46
  47        if (!strcasecmp(value, "reset")) {
  48                strcpy(dst, "\033[m");
  49                return;
  50        }
  51
  52        /* [fg [bg]] [attr] */
  53        while (*ptr) {
  54                const char *word = ptr;
  55                int val, len = 0;
  56
  57                while (word[len] && !isspace(word[len]))
  58                        len++;
  59
  60                ptr = word + len;
  61                while (*ptr && isspace(*ptr))
  62                        ptr++;
  63
  64                val = parse_color(word, len);
  65                if (val >= -1) {
  66                        if (fg == -2) {
  67                                fg = val;
  68                                continue;
  69                        }
  70                        if (bg == -2) {
  71                                bg = val;
  72                                continue;
  73                        }
  74                        goto bad;
  75                }
  76                val = parse_attr(word, len);
  77                if (val < 0 || attr != -1)
  78                        goto bad;
  79                attr = val;
  80        }
  81
  82        if (attr >= 0 || fg >= 0 || bg >= 0) {
  83                int sep = 0;
  84
  85                *dst++ = '\033';
  86                *dst++ = '[';
  87                if (attr >= 0) {
  88                        *dst++ = '0' + attr;
  89                        sep++;
  90                }
  91                if (fg >= 0) {
  92                        if (sep++)
  93                                *dst++ = ';';
  94                        if (fg < 8) {
  95                                *dst++ = '3';
  96                                *dst++ = '0' + fg;
  97                        } else {
  98                                dst += sprintf(dst, "38;5;%d", fg);
  99                        }
 100                }
 101                if (bg >= 0) {
 102                        if (sep++)
 103                                *dst++ = ';';
 104                        if (bg < 8) {
 105                                *dst++ = '4';
 106                                *dst++ = '0' + bg;
 107                        } else {
 108                                dst += sprintf(dst, "48;5;%d", bg);
 109                        }
 110                }
 111                *dst++ = 'm';
 112        }
 113        *dst = 0;
 114        return;
 115bad:
 116        die("bad config value '%s' for variable '%s'", value, var);
 117}
 118
 119int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 120{
 121        if (value) {
 122                if (!strcasecmp(value, "never"))
 123                        return 0;
 124                if (!strcasecmp(value, "always"))
 125                        return 1;
 126                if (!strcasecmp(value, "auto"))
 127                        goto auto_color;
 128        }
 129
 130        /* Missing or explicit false to turn off colorization */
 131        if (!git_config_bool(var, value))
 132                return 0;
 133
 134        /* any normal truth value defaults to 'auto' */
 135 auto_color:
 136        if (stdout_is_tty < 0)
 137                stdout_is_tty = isatty(1);
 138        if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 139                char *term = getenv("TERM");
 140                if (term && strcmp(term, "dumb"))
 141                        return 1;
 142        }
 143        return 0;
 144}
 145
 146static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 147                va_list args, const char *trail)
 148{
 149        int r = 0;
 150
 151        if (*color)
 152                r += fprintf(fp, "%s", color);
 153        r += vfprintf(fp, fmt, args);
 154        if (*color)
 155                r += fprintf(fp, "%s", COLOR_RESET);
 156        if (trail)
 157                r += fprintf(fp, "%s", trail);
 158        return r;
 159}
 160
 161
 162
 163int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 164{
 165        va_list args;
 166        int r;
 167        va_start(args, fmt);
 168        r = color_vfprintf(fp, color, fmt, args, NULL);
 169        va_end(args);
 170        return r;
 171}
 172
 173int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 174{
 175        va_list args;
 176        int r;
 177        va_start(args, fmt);
 178        r = color_vfprintf(fp, color, fmt, args, "\n");
 179        va_end(args);
 180        return r;
 181}