Introduce `git_filter_list_contains`

`git_filter_list_contains` can be used to query a filter list to
determine if a given filter will be run.

1 files changed, 23 insertions, 1 deletions

diff --git a/src/filter.c b/src/filter.c
index 3c6a0a9d8..e25d37c35 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -27,6 +27,7 @@ struct git_filter_source {
 };
 
 typedef struct {
+	const char *filter_name;
 	git_filter *filter;
 	void *payload;
 } git_filter_entry;
@@ -526,7 +527,9 @@ int git_filter_list__load_ext(
 
 			fe = git_array_alloc(fl->filters);
 			GITERR_CHECK_ALLOC(fe);
-			fe->filter  = fdef->filter;
+
+			fe->filter = fdef->filter;
+			fe->filter_name = fdef->filter_name;
 			fe->payload = payload;
 		}
 	}
@@ -574,6 +577,25 @@ void git_filter_list_free(git_filter_list *fl)
 	git__free(fl);
 }
 
+int git_filter_list_contains(
+	git_filter_list *fl,
+	const char *name)
+{
+	size_t i;
+
+	assert(name);
+
+	if (!fl)
+		return 0;
+
+	for (i = 0; i < fl->filters.size; i++) {
+		if (strcmp(fl->filters.ptr[i].filter_name, name) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
 int git_filter_list_push(
 	git_filter_list *fl, git_filter *filter, void *payload)
 {