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, 16 insertions, 0 deletions

diff --git a/include/git2/filter.h b/include/git2/filter.h
index dc59e6341..1828903e4 100644
--- a/include/git2/filter.h
+++ b/include/git2/filter.h
@@ -96,6 +96,22 @@ GIT_EXTERN(int) git_filter_list_load(
 	uint32_t flags);
 
 /**
+ * Query the filter list to see if a given filter (by name) will run.
+ * The built-in filters "crlf" and "ident" can be queried, otherwise this
+ * is the name of the filter specified by the filter attribute.
+ *
+ * This will return 0 if the given filter is not in the list, or 1 if
+ * the filter will be applied.
+ *
+ * @param filters A loaded git_filter_list (or NULL)
+ * @param name The name of the filter to query
+ * @return 1 if the filter is in the list, 0 otherwise
+ */
+GIT_EXTERN(int) git_filter_list_contains(
+	git_filter_list *filters,
+	const char *name);
+
+/**
  * Apply filter list to a data buffer.
  *
  * See `git2/buffer.h` for background on `git_buf` objects.