Add checkout options support to stash API.

Author: tiennou

ObjectiveGit/GTRepository+Stashing.h

@@ -66,21 +66,23 @@ NS_ASSUME_NONNULL_BEGIN
 ///
 /// index         - The index of the stash to apply. 0 is the latest one.
 /// flags         - The flags to use when applying the stash.
+/// options       - The options to use when checking out.
 /// error         - If not NULL, set to any error that occurred.
 /// progressBlock - A block that will be executed on each step of the stash application.
 ///
 /// Returns YES if the requested stash was successfully applied, NO otherwise.
-- (BOOL)applyStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock;
+- (BOOL)applyStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags checkoutOptions:(nullable GTCheckoutOptions *)options error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock;
 
 /// Pop stashed changes.
 ///
 /// index         - The index of the stash to apply. 0 is the most recent stash.
 /// flags         - The flags to use when applying the stash.
+/// options       - The options to use when checking out.
 /// error         - If not NULL, set to any error that occurred.
 /// progressBlock - A block that will be executed on each step of the stash application.
 ///
 /// Returns YES if the requested stash was successfully applied, NO otherwise.
-- (BOOL)popStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock;
+- (BOOL)popStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags checkoutOptions:(nullable GTCheckoutOptions *)options error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock;
 
 /// Drop a stash from the repository's list of stashes.
 ///

ObjectiveGit/GTRepository+Stashing.m

@@ -59,7 +59,7 @@ static int stashApplyProgressCallback(git_stash_apply_progress_t progress, void
 	return (stop ? GIT_EUSER : 0);
 }
 
-- (BOOL)applyStashAtIndex:(NSUInteger)index popStash:(BOOL)pop flags:(GTRepositoryStashApplyFlag)flags error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress, BOOL * __nonnull))progressBlock {
+- (BOOL)applyStashAtIndex:(NSUInteger)index popStash:(BOOL)pop flags:(GTRepositoryStashApplyFlag)flags checkoutOptions:(nullable GTCheckoutOptions *)options error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress, BOOL * __nonnull))progressBlock {
 	git_stash_apply_options stash_options = GIT_STASH_APPLY_OPTIONS_INIT;
 
 	stash_options.flags = (git_stash_apply_flags)flags;
@@ -68,6 +68,10 @@ - (BOOL)applyStashAtIndex:(NSUInteger)index popStash:(BOOL)pop flags:(GTReposito
 		stash_options.progress_payload = (__bridge void *)progressBlock;
 	}
 
+	if (options != nil) {
+		stash_options.checkout_options = *options.git_checkoutOptions;
+	}
+
 	if (pop == NO) {
 		int gitError = git_stash_apply(self.git_repository, index, &stash_options);
 		if (gitError != GIT_OK) {
@@ -84,12 +88,12 @@ - (BOOL)applyStashAtIndex:(NSUInteger)index popStash:(BOOL)pop flags:(GTReposito
 	return YES;
 }
 
-- (BOOL)applyStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock {
-	return [self applyStashAtIndex:index popStash:NO flags:flags error:error progressBlock:progressBlock];
+- (BOOL)applyStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags checkoutOptions:(nullable GTCheckoutOptions *)options error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock {
+	return [self applyStashAtIndex:index popStash:NO flags:flags checkoutOptions:options error:error progressBlock:progressBlock];
 }
 
-- (BOOL)popStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock {
-	return [self applyStashAtIndex:index popStash:YES flags:flags error:error progressBlock:progressBlock];
+- (BOOL)popStashAtIndex:(NSUInteger)index flags:(GTRepositoryStashApplyFlag)flags checkoutOptions:(nullable GTCheckoutOptions *)options error:(NSError **)error progressBlock:(nullable void (^)(GTRepositoryStashApplyProgress progress, BOOL *stop))progressBlock {
+	return [self applyStashAtIndex:index popStash:YES flags:flags checkoutOptions:options error:error progressBlock:progressBlock];
 }
 
 - (BOOL)dropStashAtIndex:(NSUInteger)index error:(NSError **)error {