[PATCH v3 1/2] btrfs-progs: common: extend fmt_print_start_group handles unnamed group

[Sidong Yang <realwakka@gmail.com>]

This patch extends fmt_print_start_group() that it can handle when name
argument is NULL. It is useful for printing unnamed array or map.

Signed-off-by: Sidong Yang <realwakka@gmail.com>
---
v3:
 - extend fmt_print_start_group rather than writing new function
---
 common/format-output.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/common/format-output.c b/common/format-output.c
index 8df93ecb..2f74595c 100644
--- a/common/format-output.c
+++ b/common/format-output.c
@@ -181,17 +181,23 @@ void fmt_end_value(struct format_ctx *fctx, const struct rowspec *row)
 void fmt_print_start_group(struct format_ctx *fctx, const char *name,
 		enum json_type jtype)
 {
+	char bracket;
 	if (bconf.output_format == CMD_FORMAT_JSON) {
 		fmt_separator(fctx);
 		fmt_inc_depth(fctx);
 		fctx->jtype[fctx->depth] = jtype;
 		fctx->memb[fctx->depth] = 0;
 		if (jtype == JSON_TYPE_MAP)
-			printf("\"%s\": {", name);
+			bracket = '{';
 		else if (jtype == JSON_TYPE_ARRAY)
-			printf("\"%s\": [", name);
+			bracket = '[';
 		else
 			fmt_error(fctx);
+
+		if (name)
+			printf("\"%s\": %c", name, bracket);
+		else
+			putchar(bracket);
 	}
 }
 
-- 
2.25.1