ref-filter: get rid of show_ref_array_item

Inlining the exported function `show_ref_array_item()`,
which is not providing the right level of abstraction,
simplifies the API and can unlock improvements at the
former call sites.

Helped-by: René Scharfe <l.s.r@web.de>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index cb9c81a..8520008 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -80,8 +80,18 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 
 	if (!maxcount || array.nr < maxcount)
 		maxcount = array.nr;
-	for (i = 0; i < maxcount; i++)
-		show_ref_array_item(array.items[i], &format);
+	for (i = 0; i < maxcount; i++) {
+		struct strbuf output = STRBUF_INIT;
+		struct strbuf err = STRBUF_INIT;
+
+		if (format_ref_array_item(array.items[i], &format, &output, &err))
+			die("%s", err.buf);
+		fwrite(output.buf, 1, output.len, stdout);
+		putchar('\n');
+
+		strbuf_release(&err);
+		strbuf_release(&output);
+	}
 	ref_array_clear(&array);
 	return 0;
 }
diff --git a/builtin/tag.c b/builtin/tag.c
index d403417..d92d8e1 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -63,8 +63,18 @@ static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting,
 	filter_refs(&array, filter, FILTER_REFS_TAGS);
 	ref_array_sort(sorting, &array);
 
-	for (i = 0; i < array.nr; i++)
-		show_ref_array_item(array.items[i], format);
+	for (i = 0; i < array.nr; i++) {
+		struct strbuf output = STRBUF_INIT;
+		struct strbuf err = STRBUF_INIT;
+
+		if (format_ref_array_item(array.items[i], format, &output, &err))
+			die("%s", err.buf);
+		fwrite(output.buf, 1, output.len, stdout);
+		putchar('\n');
+
+		strbuf_release(&err);
+		strbuf_release(&output);
+	}
 	ref_array_clear(&array);
 	free(to_free);