color.c

   1 #include "cache.h"
   2 #include "color.h"
   3
   4 int git_use_color_default = 0;
   5
   6 static 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
  25 static 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
  40 void color_parse(const char *value, const char *var, char *dst)
  41 {
  42         color_parse_mem(value, strlen(value), var, dst);
  43 }
  44
  45 void 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;
 134 bad:
 135         die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 136 }
 137
 138 int 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         /* Missing or explicit false to turn off colorization */
 150         if (!git_config_bool(var, value))
 151                 return 0;
 152
 153         /* any normal truth value defaults to 'auto' */
 154  auto_color:
 155         if (stdout_is_tty < 0)
 156                 stdout_is_tty = isatty(1);
 157         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 158                 char *term = getenv("TERM");
 159                 if (term && strcmp(term, "dumb"))
 160                         return 1;
 161         }
 162         return 0;
 163 }
 164
 165 int git_color_default_config(const char *var, const char *value, void *cb)
 166 {
 167         if (!strcmp(var, "color.ui")) {
 168                 git_use_color_default = git_config_colorbool(var, value, -1);
 169                 return 0;
 170         }
 171
 172         return git_default_config(var, value, cb);
 173 }
 174
 175 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 176                 va_list args, const char *trail)
 177 {
 178         int r = 0;
 179
 180         if (*color)
 181                 r += fprintf(fp, "%s", color);
 182         r += vfprintf(fp, fmt, args);
 183         if (*color)
 184                 r += fprintf(fp, "%s", GIT_COLOR_RESET);
 185         if (trail)
 186                 r += fprintf(fp, "%s", trail);
 187         return r;
 188 }
 189
 190
 191
 192 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 193 {
 194         va_list args;
 195         int r;
 196         va_start(args, fmt);
 197         r = color_vfprintf(fp, color, fmt, args, NULL);
 198         va_end(args);
 199         return r;
 200 }
 201
 202 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 203 {
 204         va_list args;
 205         int r;
 206         va_start(args, fmt);
 207         r = color_vfprintf(fp, color, fmt, args, "\n");
 208         va_end(args);
 209         return r;
 210 }
 211
 212 /*
 213  * This function splits the buffer by newlines and colors the lines individually.
 214  *
 215  * Returns 0 on success.
 216  */
 217 int color_fwrite_lines(FILE *fp, const char *color,
 218                 size_t count, const char *buf)
 219 {
 220         if (!*color)
 221                 return fwrite(buf, count, 1, fp) != 1;
 222         while (count) {
 223                 char *p = memchr(buf, '\n', count);
 224                 if (p != buf && (fputs(color, fp) < 0 ||
 225                                 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
 226                                 fputs(GIT_COLOR_RESET, fp) < 0))
 227                         return -1;
 228                 if (!p)
 229                         return 0;
 230                 if (fputc('\n', fp) < 0)
 231                         return -1;
 232                 count -= p + 1 - buf;
 233                 buf = p + 1;
 234         }
 235         return 0;
 236 }
 237
 238