apply: add an options struct initializer

include/git2/apply.h

@@ -57,7 +57,7 @@ typedef int GIT_CALLBACK(git_apply_hunk_cb)(
  * Apply options structure
  *
  * Initialize with `GIT_APPLY_OPTIONS_INIT`. Alternatively, you can
- * use `git_apply_init_options`.
+ * use `git_apply_options_init`.
  *
  * @see git_apply_to_tree, git_apply
  */
@@ -72,6 +72,8 @@ typedef struct {
 #define GIT_APPLY_OPTIONS_VERSION 1
 #define GIT_APPLY_OPTIONS_INIT {GIT_APPLY_OPTIONS_VERSION}
 
+GIT_EXTERN(int) git_apply_options_init(git_apply_options *opts, unsigned int version);
+
 /**
  * Apply a `git_diff` to a `git_tree`, and return the resulting image
  * as an index.

src/apply.c

@@ -745,6 +745,13 @@ done:
 	return error;
 }
 
+int git_apply_options_init(git_apply_options *opts, unsigned int version)
+{
+	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
+		opts, version, git_apply_options, GIT_APPLY_OPTIONS_INIT);
+	return 0;
+}
+
 /*
  * Handle the three application options ("locations"):
  *

tests/core/structinit.c

@@ -72,6 +72,11 @@ void test_core_structinit__compare(void)
 	clar__skip();
 #endif
 
+	/* apply */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_apply_options, GIT_APPLY_OPTIONS_VERSION, \
+		GIT_APPLY_OPTIONS_INIT, git_apply_options_init);
+
 	/* blame */
 	CHECK_MACRO_FUNC_INIT_EQUAL( \
 		git_blame_options, GIT_BLAME_OPTIONS_VERSION, \