color.c

   1 #include "cache.h"
   2 #include "color.h"
   3
   4 int git_use_color_default = 0;
   5
   6 /*
   7  * The list of available column colors.
   8  */
   9 const char *column_colors_ansi[] = {
  10         GIT_COLOR_RED,
  11         GIT_COLOR_GREEN,
  12         GIT_COLOR_YELLOW,
  13         GIT_COLOR_BLUE,
  14         GIT_COLOR_MAGENTA,
  15         GIT_COLOR_CYAN,
  16         GIT_COLOR_BOLD_RED,
  17         GIT_COLOR_BOLD_GREEN,
  18         GIT_COLOR_BOLD_YELLOW,
  19         GIT_COLOR_BOLD_BLUE,
  20         GIT_COLOR_BOLD_MAGENTA,
  21         GIT_COLOR_BOLD_CYAN,
  22         GIT_COLOR_RESET,
  23 };
  24
  25 /* Ignore the RESET at the end when giving the size */
  26 const int column_colors_ansi_max = ARRAY_SIZE(column_colors_ansi) - 1;
  27
  28 static int parse_color(const char *name, int len)
  29 {
  30         static const char * const color_names[] = {
  31                 "normal", "black", "red", "green", "yellow",
  32                 "blue", "magenta", "cyan", "white"
  33         };
  34         char *end;
  35         int i;
  36         for (i = 0; i < ARRAY_SIZE(color_names); i++) {
  37                 const char *str = color_names[i];
  38                 if (!strncasecmp(name, str, len) && !str[len])
  39                         return i - 1;
  40         }
  41         i = strtol(name, &end, 10);
  42         if (end - name == len && i >= -1 && i <= 255)
  43                 return i;
  44         return -2;
  45 }
  46
  47 static int parse_attr(const char *name, int len)
  48 {
  49         static const int attr_values[] = { 1, 2, 4, 5, 7 };
  50         static const char * const attr_names[] = {
  51                 "bold", "dim", "ul", "blink", "reverse"
  52         };
  53         int i;
  54         for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
  55                 const char *str = attr_names[i];
  56                 if (!strncasecmp(name, str, len) && !str[len])
  57                         return attr_values[i];
  58         }
  59         return -1;
  60 }
  61
  62 void color_parse(const char *value, const char *var, char *dst)
  63 {
  64         color_parse_mem(value, strlen(value), var, dst);
  65 }
  66
  67 void color_parse_mem(const char *value, int value_len, const char *var,
  68                 char *dst)
  69 {
  70         const char *ptr = value;
  71         int len = value_len;
  72         unsigned int attr = 0;
  73         int fg = -2;
  74         int bg = -2;
  75
  76         if (!strncasecmp(value, "reset", len)) {
  77                 strcpy(dst, GIT_COLOR_RESET);
  78                 return;
  79         }
  80
  81         /* [fg [bg]] [attr]... */
  82         while (len > 0) {
  83                 const char *word = ptr;
  84                 int val, wordlen = 0;
  85
  86                 while (len > 0 && !isspace(word[wordlen])) {
  87                         wordlen++;
  88                         len--;
  89                 }
  90
  91                 ptr = word + wordlen;
  92                 while (len > 0 && isspace(*ptr)) {
  93                         ptr++;
  94                         len--;
  95                 }
  96
  97                 val = parse_color(word, wordlen);
  98                 if (val >= -1) {
  99                         if (fg == -2) {
 100                                 fg = val;
 101                                 continue;
 102                         }
 103                         if (bg == -2) {
 104                                 bg = val;
 105                                 continue;
 106                         }
 107                         goto bad;
 108                 }
 109                 val = parse_attr(word, wordlen);
 110                 if (0 <= val)
 111                         attr |= (1 << val);
 112                 else
 113                         goto bad;
 114         }
 115
 116         if (attr || fg >= 0 || bg >= 0) {
 117                 int sep = 0;
 118                 int i;
 119
 120                 *dst++ = '\033';
 121                 *dst++ = '[';
 122
 123                 for (i = 0; attr; i++) {
 124                         unsigned bit = (1 << i);
 125                         if (!(attr & bit))
 126                                 continue;
 127                         attr &= ~bit;
 128                         if (sep++)
 129                                 *dst++ = ';';
 130                         *dst++ = '0' + i;
 131                 }
 132                 if (fg >= 0) {
 133                         if (sep++)
 134                                 *dst++ = ';';
 135                         if (fg < 8) {
 136                                 *dst++ = '3';
 137                                 *dst++ = '0' + fg;
 138                         } else {
 139                                 dst += sprintf(dst, "38;5;%d", fg);
 140                         }
 141                 }
 142                 if (bg >= 0) {
 143                         if (sep++)
 144                                 *dst++ = ';';
 145                         if (bg < 8) {
 146                                 *dst++ = '4';
 147                                 *dst++ = '0' + bg;
 148                         } else {
 149                                 dst += sprintf(dst, "48;5;%d", bg);
 150                         }
 151                 }
 152                 *dst++ = 'm';
 153         }
 154         *dst = 0;
 155         return;
 156 bad:
 157         die("bad color value '%.*s' for variable '%s'", value_len, value, var);
 158 }
 159
 160 int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
 161 {
 162         if (value) {
 163                 if (!strcasecmp(value, "never"))
 164                         return 0;
 165                 if (!strcasecmp(value, "always"))
 166                         return 1;
 167                 if (!strcasecmp(value, "auto"))
 168                         goto auto_color;
 169         }
 170
 171         if (!var)
 172                 return -1;
 173
 174         /* Missing or explicit false to turn off colorization */
 175         if (!git_config_bool(var, value))
 176                 return 0;
 177
 178         /* any normal truth value defaults to 'auto' */
 179  auto_color:
 180         if (stdout_is_tty < 0)
 181                 stdout_is_tty = isatty(1);
 182         if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
 183                 char *term = getenv("TERM");
 184                 if (term && strcmp(term, "dumb"))
 185                         return 1;
 186         }
 187         return 0;
 188 }
 189
 190 int git_color_default_config(const char *var, const char *value, void *cb)
 191 {
 192         if (!strcmp(var, "color.ui")) {
 193                 git_use_color_default = git_config_colorbool(var, value, -1);
 194                 return 0;
 195         }
 196
 197         return git_default_config(var, value, cb);
 198 }
 199
 200 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 201 {
 202         if (*color)
 203                 fprintf(fp, "%s", color);
 204         fprintf(fp, "%s", sb->buf);
 205         if (*color)
 206                 fprintf(fp, "%s", GIT_COLOR_RESET);
 207 }
 208
 209 static int color_vfprintf(FILE *fp, const char *color, const char *fmt,
 210                 va_list args, const char *trail)
 211 {
 212         int r = 0;
 213
 214         if (*color)
 215                 r += fprintf(fp, "%s", color);
 216         r += vfprintf(fp, fmt, args);
 217         if (*color)
 218                 r += fprintf(fp, "%s", GIT_COLOR_RESET);
 219         if (trail)
 220                 r += fprintf(fp, "%s", trail);
 221         return r;
 222 }
 223
 224
 225
 226 int color_fprintf(FILE *fp, const char *color, const char *fmt, ...)
 227 {
 228         va_list args;
 229         int r;
 230         va_start(args, fmt);
 231         r = color_vfprintf(fp, color, fmt, args, NULL);
 232         va_end(args);
 233         return r;
 234 }
 235
 236 int color_fprintf_ln(FILE *fp, const char *color, const char *fmt, ...)
 237 {
 238         va_list args;
 239         int r;
 240         va_start(args, fmt);
 241         r = color_vfprintf(fp, color, fmt, args, "\n");
 242         va_end(args);
 243         return r;
 244 }
 245
 246 int color_is_nil(const char *c)
 247 {
 248         return !strcmp(c, "NIL");
 249 }