[PATCH 2/2] pretty: support placeholders %C+ and %C-

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

%C+ tells the next specifiers that color is preferred. %C- the
opposite. So far only %H, %h and %d support coloring.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Documentation/pretty-formats.txt |  2 ++
 pretty.c                         | 13 ++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index e3d8a83..6e287d6 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -142,6 +142,8 @@ The placeholders are:
 - '%Cblue': switch color to blue
 - '%Creset': reset color
 - '%C(...)': color specification, as described in color.branch.* config option
+- '%C+': enable coloring on the following placeholders if supported
+- '%C-': disable coloring on the following placeholders
 - '%m': left, right or boundary mark
 - '%n': newline
 - '%%': a raw '%'
diff --git a/pretty.c b/pretty.c
index e910679..b1cec71 100644
--- a/pretty.c
+++ b/pretty.c
@@ -623,6 +623,7 @@ struct format_commit_context {
 	unsigned commit_header_parsed:1;
 	unsigned commit_message_parsed:1;
 	unsigned commit_signature_parsed:1;
+	unsigned use_color:1;
 	struct {
 		char *gpg_output;
 		char good_bad;
@@ -885,6 +886,12 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 					"--pretty format", color);
 			strbuf_addstr(sb, color);
 			return end - placeholder + 1;
+		} else if (placeholder[1] == '+') {
+			c->use_color = 1;
+			return 2;
+		} else if (placeholder[1] == '-') {
+			c->use_color = 0;
+			return 2;
 		}
 		if (!prefixcmp(placeholder + 1, "red")) {
 			strbuf_addstr(sb, GIT_COLOR_RED);
@@ -945,13 +952,17 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 
 	switch (placeholder[0]) {
 	case 'H':		/* commit hash */
+		strbuf_addstr(sb, diff_get_color(c->use_color, DIFF_COMMIT));
 		strbuf_addstr(sb, sha1_to_hex(commit->object.sha1));
+		strbuf_addstr(sb, diff_get_color(c->use_color, DIFF_RESET));
 		return 1;
 	case 'h':		/* abbreviated commit hash */
+		strbuf_addstr(sb, diff_get_color(c->use_color, DIFF_COMMIT));
 		if (add_again(sb, &c->abbrev_commit_hash))
 			return 1;
 		strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1,
 						     c->pretty_ctx->abbrev));
+		strbuf_addstr(sb, diff_get_color(c->use_color, DIFF_RESET));
 		c->abbrev_commit_hash.len = sb->len - c->abbrev_commit_hash.off;
 		return 1;
 	case 'T':		/* tree hash */
@@ -988,7 +999,7 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 		strbuf_addstr(sb, get_revision_mark(NULL, commit));
 		return 1;
 	case 'd':
-		format_decoration(sb, commit, 0);
+		format_decoration(sb, commit, c->use_color);
 		return 1;
 	case 'g':		/* reflog info */
 		switch(placeholder[1]) {
-- 
1.7.12.1.383.gda6001e.dirty