config: format colors gently

Move the logic for formatting color config value into a helper method
and use gentle parsing when needed.

This removes error messages when parsing a list of config values that do
not match color formats.

Signed-off-by: Derrick Stolee <stolee@gmail.com>

Author: derrickstolee

builtin/config.c

@@ -354,6 +354,24 @@ static int format_config_expiry_date(struct strbuf *buf,
 	return 0;
 }
 
+static int format_config_color(struct strbuf *buf,
+			       const char *key_,
+			       const char *value_,
+			       int gently)
+{
+	char v[COLOR_MAXLEN];
+
+	if (gently) {
+		if (color_parse_gently(value_, v) < 0)
+			return -1;
+	} else if (git_config_color(v, key_, value_) < 0) {
+		return -1;
+	}
+
+	strbuf_addstr(buf, v);
+	return 0;
+}
+
 /*
  * Format the configuration key-value pair (`key_`, `value_`) and
  * append it into strbuf `buf`.  Returns a negative value on failure,
@@ -391,12 +409,9 @@ static int format_config(const struct config_display_options *opts,
 			res = format_config_path(buf, key_, value_, gently);
 		else if (opts->type == TYPE_EXPIRY_DATE)
 			res = format_config_expiry_date(buf, key_, value_, gently);
-		else if (opts->type == TYPE_COLOR) {
-			char v[COLOR_MAXLEN];
-			if (git_config_color(v, key_, value_) < 0)
-				return -1;
-			strbuf_addstr(buf, v);
-		} else if (value_) {
+		else if (opts->type == TYPE_COLOR)
+			res = format_config_color(buf, key_, value_, gently);
+		else if (value_) {
 			strbuf_addstr(buf, value_);
 		} else {
 			/* Just show the key name; back out delimiter */

t/t1300-config.sh

@@ -2553,17 +2553,10 @@ test_expect_success 'list --type=color shows only canonicalizable color values'
 	section.blue=<BLUE>
 	EOF
 
-	cat >expecterr <<-EOF &&
-	error: invalid color value: True
-	error: invalid color value: 1M
-	error: invalid color value: ~/dir
-	error: invalid color value: Fri Jun 4 15:46:55 2010
-	EOF
-
 	git config ${mode_prefix}list --type=color >actual.raw 2>err &&
 	test_decode_color <actual.raw >actual &&
 	test_cmp expect actual &&
-	test_cmp expecterr err
+	test_must_be_empty err
 '
 
 test_expect_success '--type rejects unknown specifiers' '