pretty: share code between format_decoration and show_decorations

This also adds color support to format_decorations()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

log-tree.c

@@ -175,36 +175,52 @@ static void show_children(struct rev_info *opt, struct commit *commit, int abbre
 	}
 }
 
-void show_decorations(struct rev_info *opt, struct commit *commit)
+/*
+ * The caller makes sure there is no funny color before
+ * calling. format_decorations makes sure the same after return.
+ */
+void format_decorations(struct strbuf *sb,
+			const struct commit *commit,
+			int use_color)
 {
 	const char *prefix;
 	struct name_decoration *decoration;
 	const char *color_commit =
-		diff_get_color_opt(&opt->diffopt, DIFF_COMMIT);
+		diff_get_color(use_color, DIFF_COMMIT);
 	const char *color_reset =
-		decorate_get_color_opt(&opt->diffopt, DECORATION_NONE);
+		decorate_get_color(use_color, DECORATION_NONE);
 
-	if (opt->show_source && commit->util)
-		printf("\t%s", (char *) commit->util);
-	if (!opt->show_decorations)
-		return;
 	decoration = lookup_decoration(&name_decoration, &commit->object);
 	if (!decoration)
 		return;
 	prefix = " (";
 	while (decoration) {
-		printf("%s", prefix);
-		fputs(decorate_get_color_opt(&opt->diffopt, decoration->type),
-		      stdout);
+		strbuf_addstr(sb, color_commit);
+		strbuf_addstr(sb, prefix);
+		strbuf_addstr(sb, decorate_get_color(use_color, decoration->type));
 		if (decoration->type == DECORATION_REF_TAG)
-			fputs("tag: ", stdout);
-		printf("%s", decoration->name);
-		fputs(color_reset, stdout);
-		fputs(color_commit, stdout);
+			strbuf_addstr(sb, "tag: ");
+		strbuf_addstr(sb, decoration->name);
+		strbuf_addstr(sb, color_reset);
 		prefix = ", ";
 		decoration = decoration->next;
 	}
-	putchar(')');
+	strbuf_addstr(sb, color_commit);
+	strbuf_addch(sb, ')');
+	strbuf_addstr(sb, color_reset);
+}
+
+void show_decorations(struct rev_info *opt, struct commit *commit)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	if (opt->show_source && commit->util)
+		printf("\t%s", (char *) commit->util);
+	if (!opt->show_decorations)
+		return;
+	format_decorations(&sb, commit, opt->diffopt.use_color);
+	fputs(sb.buf, stdout);
+	strbuf_release(&sb);
 }
 
 static unsigned int digits_in_number(unsigned int number)
@@ -540,8 +556,8 @@ void show_log(struct rev_info *opt)
 			printf(" (from %s)",
 			       find_unique_abbrev(parent->object.sha1,
 						  abbrev_commit));
+		fputs(diff_get_color_opt(&opt->diffopt, DIFF_RESET), stdout);
 		show_decorations(opt, commit);
-		printf("%s", diff_get_color_opt(&opt->diffopt, DIFF_RESET));
 		if (opt->commit_format == CMIT_FMT_ONELINE) {
 			putchar(' ');
 		} else {

log-tree.h

@@ -13,6 +13,7 @@ int log_tree_diff_flush(struct rev_info *);
 int log_tree_commit(struct rev_info *, struct commit *);
 int log_tree_opt_parse(struct rev_info *, const char **, int);
 void show_log(struct rev_info *opt);
+void format_decorations(struct strbuf *sb, const struct commit *commit, int use_color);
 void show_decorations(struct rev_info *opt, struct commit *commit);
 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 			     const char **subject_p,

pretty.c

@@ -908,23 +908,6 @@ static void parse_commit_message(struct format_commit_context *c)
 	c->commit_message_parsed = 1;
 }
 
-static void format_decoration(struct strbuf *sb, const struct commit *commit)
-{
-	struct name_decoration *d;
-	const char *prefix = " (";
-
-	load_ref_decorations(DECORATE_SHORT_REFS);
-	d = lookup_decoration(&name_decoration, &commit->object);
-	while (d) {
-		strbuf_addstr(sb, prefix);
-		prefix = ", ";
-		strbuf_addstr(sb, d->name);
-		d = d->next;
-	}
-	if (prefix[0] == ',')
-		strbuf_addch(sb, ')');
-}
-
 static void strbuf_wrap(struct strbuf *sb, size_t pos,
 			size_t width, size_t indent1, size_t indent2)
 {
@@ -1103,7 +1086,8 @@ 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);
+		load_ref_decorations(DECORATE_SHORT_REFS);
+		format_decorations(sb, commit, 0);
 		return 1;
 	case 'g':		/* reflog info */
 		switch(placeholder[1]) {

t/t4207-log-decoration-colors.sh

@@ -44,15 +44,15 @@ test_expect_success setup '
 '
 
 cat >expected <<EOF
-${c_commit}COMMIT_ID (${c_HEAD}HEAD${c_reset}${c_commit},\
+${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_HEAD}HEAD${c_reset}${c_commit},\
  ${c_tag}tag: v1.0${c_reset}${c_commit},\
  ${c_tag}tag: B${c_reset}${c_commit},\
  ${c_branch}master${c_reset}${c_commit})${c_reset} B
-${c_commit}COMMIT_ID (${c_tag}tag: A1${c_reset}${c_commit},\
+${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_tag}tag: A1${c_reset}${c_commit},\
  ${c_remoteBranch}other/master${c_reset}${c_commit})${c_reset} A1
-${c_commit}COMMIT_ID (${c_stash}refs/stash${c_reset}${c_commit})${c_reset}\
+${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_stash}refs/stash${c_reset}${c_commit})${c_reset}\
  On master: Changes to A.t
-${c_commit}COMMIT_ID (${c_tag}tag: A${c_reset}${c_commit})${c_reset} A
+${c_commit}COMMIT_ID${c_reset}${c_commit} (${c_tag}tag: A${c_reset}${c_commit})${c_reset} A
 EOF
 
 # We want log to show all, but the second parent to refs/stash is irrelevant