Subject: [PATCH v2 3/9] list-objects-filter-options: always supply *errbuf

From: Matthew DeVore <[email-masked]>
Date: Fri, 31 May 2019 17:35:57 -0700

Making errbuf an optional argument complicates error reporting. Fix this
by making all callers supply an errbuf, even if they may ignore it. This
will be important in follow-up patches where the filter-spec parsing has
more pitfalls and possible errors.

Signed-off-by: Matthew DeVore <[email-masked]>
---
 list-objects-filter-options.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index c0036f7378..aef24ddae3 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -23,47 +23,40 @@
  * convenience of the current command.
  */
 static int gently_parse_list_objects_filter(
 	struct list_objects_filter_options *filter_options,
 	const char *arg,
 	struct strbuf *errbuf)
 {
 	const char *v0;
 
 	if (filter_options->choice) {
-		if (errbuf) {
-			strbuf_addstr(
-				errbuf,
-				_("multiple filter-specs cannot be combined"));
-		}
+		strbuf_addstr(
+			errbuf, _("multiple filter-specs cannot be combined"));
 		return 1;
 	}
 
 	filter_options->filter_spec = strdup(arg);
 
 	if (!strcmp(arg, "blob:none")) {
 		filter_options->choice = LOFC_BLOB_NONE;
 		return 0;
 
 	} else if (skip_prefix(arg, "blob:limit=", &v0)) {
 		if (git_parse_ulong(v0, &filter_options->blob_limit_value)) {
 			filter_options->choice = LOFC_BLOB_LIMIT;
 			return 0;
 		}
 
 	} else if (skip_prefix(arg, "tree:", &v0)) {
 		if (!git_parse_ulong(v0, &filter_options->tree_exclude_depth)) {
-			if (errbuf) {
-				strbuf_addstr(
-					errbuf,
-					_("expected 'tree:<depth>'"));
-			}
+			strbuf_addstr(errbuf, _("expected 'tree:<depth>'"));
 			return 1;
 		}
 		filter_options->choice = LOFC_TREE_DEPTH;
 		return 0;
 
 	} else if (skip_prefix(arg, "sparse:oid=", &v0)) {
 		struct object_context oc;
 		struct object_id sparse_oid;
 
 		/*
@@ -80,22 +73,21 @@ static int gently_parse_list_objects_filter(
 	} else if (skip_prefix(arg, "sparse:path=", &v0)) {
 		filter_options->choice = LOFC_SPARSE_PATH;
 		filter_options->sparse_path_value = strdup(v0);
 		return 0;
 	}
 	/*
 	 * Please update _git_fetch() in git-completion.bash when you
 	 * add new filters
 	 */
 
-	if (errbuf)
-		strbuf_addf(errbuf, "invalid filter-spec '%s'", arg);
+	strbuf_addf(errbuf, "invalid filter-spec '%s'", arg);
 
 	memset(filter_options, 0, sizeof(*filter_options));
 	return 1;
 }
 
 int parse_list_objects_filter(struct list_objects_filter_options *filter_options,
 			      const char *arg)
 {
 	struct strbuf buf = STRBUF_INIT;
 	if (gently_parse_list_objects_filter(filter_options, arg, &buf))
@@ -166,19 +158,22 @@ void partial_clone_register(
 	 */
 	core_partial_clone_filter_default =
 		xstrdup(filter_options->filter_spec);
 	git_config_set("core.partialclonefilter",
 		       core_partial_clone_filter_default);
 }
 
 void partial_clone_get_default_filter_spec(
 	struct list_objects_filter_options *filter_options)
 {
+	struct strbuf errbuf = STRBUF_INIT;
+
 	/*
 	 * Parse default value, but silently ignore it if it is invalid.
 	 */
 	if (!core_partial_clone_filter_default)
 		return;
 	gently_parse_list_objects_filter(filter_options,
 					 core_partial_clone_filter_default,
-					 NULL);
+					 &errbuf);
+	strbuf_release(&errbuf);
 }
-- 
2.17.1