diff: Support both attributes and colors

Make it possible to set both colors and a attribute for diff colors.
Background colors are supported too.

Syntax is now:

	[attr] [fg [bg]]
	[fg [bg]] [attr]

Empty value is same as "normal normal", ie use default colors.  The new
syntax is backwards compatible.

Signed-off-by: Timo Hirvonen <tihirvon@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/diff.c b/diff.c
index 287a927ce3131fd3a5c9151e5ea1e560842767a1..f350c6ba910dfc5ac11aa75ba0af668237cd1f8e 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -26,30 +26,14 @@ enum color_diff {
        DIFF_FILE_NEW = 5,
 };
 
-#define COLOR_NORMAL  ""
-#define COLOR_BOLD    "\033[1m"
-#define COLOR_DIM     "\033[2m"
-#define COLOR_UL      "\033[4m"
-#define COLOR_BLINK   "\033[5m"
-#define COLOR_REVERSE "\033[7m"
-#define COLOR_RESET   "\033[m"
-
-#define COLOR_BLACK   "\033[30m"
-#define COLOR_RED     "\033[31m"
-#define COLOR_GREEN   "\033[32m"
-#define COLOR_YELLOW  "\033[33m"
-#define COLOR_BLUE    "\033[34m"
-#define COLOR_MAGENTA "\033[35m"
-#define COLOR_CYAN    "\033[36m"
-#define COLOR_WHITE   "\033[37m"
-
-static const char *diff_colors[] = {
-       COLOR_RESET,
-       COLOR_NORMAL,
-       COLOR_BOLD,
-       COLOR_CYAN,
-       COLOR_RED,
-       COLOR_GREEN
+/* "\033[1;30;47m\0" is 11 bytes */
+static char diff_colors[][16] = {
+       "\033[m",       /* reset */
+       "",             /* normal */
+       "\033[1m",      /* bold */
+       "\033[36m",     /* cyan */
+       "\033[31m",     /* red */
+       "\033[32m"      /* green */
 };
 
 static int parse_diff_color_slot(const char *var, int ofs)
@@ -67,38 +51,104 @@ static int parse_diff_color_slot(const char *var, int ofs)
        die("bad config variable '%s'", var);
 }
 
-static const char *parse_diff_color_value(const char *value, const char *var)
-{
-       if (!strcasecmp(value, "normal"))
-               return COLOR_NORMAL;
-       if (!strcasecmp(value, "bold"))
-               return COLOR_BOLD;
-       if (!strcasecmp(value, "dim"))
-               return COLOR_DIM;
-       if (!strcasecmp(value, "ul"))
-               return COLOR_UL;
-       if (!strcasecmp(value, "blink"))
-               return COLOR_BLINK;
-       if (!strcasecmp(value, "reverse"))
-               return COLOR_REVERSE;
-       if (!strcasecmp(value, "reset"))
-               return COLOR_RESET;
-       if (!strcasecmp(value, "black"))
-               return COLOR_BLACK;
-       if (!strcasecmp(value, "red"))
-               return COLOR_RED;
-       if (!strcasecmp(value, "green"))
-               return COLOR_GREEN;
-       if (!strcasecmp(value, "yellow"))
-               return COLOR_YELLOW;
-       if (!strcasecmp(value, "blue"))
-               return COLOR_BLUE;
-       if (!strcasecmp(value, "magenta"))
-               return COLOR_MAGENTA;
-       if (!strcasecmp(value, "cyan"))
-               return COLOR_CYAN;
-       if (!strcasecmp(value, "white"))
-               return COLOR_WHITE;
+static int parse_color(const char *name, int len)
+{
+       static const char * const color_names[] = {
+               "normal", "black", "red", "green", "yellow",
+               "blue", "magenta", "cyan", "white"
+       };
+       int i;
+       for (i = 0; i < ARRAY_SIZE(color_names); i++) {
+               const char *str = color_names[i];
+               if (!strncasecmp(name, str, len) && !str[len])
+                       return i - 1;
+       }
+       return -2;
+}
+
+static int parse_attr(const char *name, int len)
+{
+       static const int attr_values[] = { 1, 2, 4, 5, 7 };
+       static const char * const attr_names[] = {
+               "bold", "dim", "ul", "blink", "reverse"
+       };
+       int i;
+       for (i = 0; i < ARRAY_SIZE(attr_names); i++) {
+               const char *str = attr_names[i];
+               if (!strncasecmp(name, str, len) && !str[len])
+                       return attr_values[i];
+       }
+       return -1;
+}
+
+static void parse_diff_color_value(const char *value, const char *var, char *dst)
+{
+       const char *ptr = value;
+       int attr = -1;
+       int fg = -2;
+       int bg = -2;
+
+       if (!strcasecmp(value, "reset")) {
+               strcpy(dst, "\033[m");
+               return;
+       }
+
+       /* [fg [bg]] [attr] */
+       while (*ptr) {
+               const char *word = ptr;
+               int val, len = 0;
+
+               while (word[len] && !isspace(word[len]))
+                       len++;
+
+               ptr = word + len;
+               while (*ptr && isspace(*ptr))
+                       ptr++;
+
+               val = parse_color(word, len);
+               if (val >= -1) {
+                       if (fg == -2) {
+                               fg = val;
+                               continue;
+                       }
+                       if (bg == -2) {
+                               bg = val;
+                               continue;
+                       }
+                       goto bad;
+               }
+               val = parse_attr(word, len);
+               if (val < 0 || attr != -1)
+                       goto bad;
+               attr = val;
+       }
+
+       if (attr >= 0 || fg >= 0 || bg >= 0) {
+               int sep = 0;
+
+               *dst++ = '\033';
+               *dst++ = '[';
+               if (attr >= 0) {
+                       *dst++ = '0' + attr;
+                       sep++;
+               }
+               if (fg >= 0) {
+                       if (sep++)
+                               *dst++ = ';';
+                       *dst++ = '3';
+                       *dst++ = '0' + fg;
+               }
+               if (bg >= 0) {
+                       if (sep++)
+                               *dst++ = ';';
+                       *dst++ = '4';
+                       *dst++ = '0' + bg;
+               }
+               *dst++ = 'm';
+       }
+       *dst = 0;
+       return;
+bad:
        die("bad config value '%s' for variable '%s'", value, var);
 }
 
@@ -145,7 +195,7 @@ int git_diff_ui_config(const char *var, const char *value)
        }
        if (!strncmp(var, "diff.color.", 11)) {
                int slot = parse_diff_color_slot(var, 11);
-               diff_colors[slot] = parse_diff_color_value(value, var);
+               parse_diff_color_value(value, var, diff_colors[slot]);
                return 0;
        }
        return git_default_config(var, value);