int git_stash_apply()

in src/stash.c [857:995]

• 92 lines of code
• 22 McCabe index (conditional complexity)

int git_stash_apply(
	git_repository *repo,
	size_t index,
	const git_stash_apply_options *given_opts)
{
	git_stash_apply_options opts;
	unsigned int checkout_strategy;
	git_commit *stash_commit = NULL;
	git_tree *stash_tree = NULL;
	git_tree *stash_parent_tree = NULL;
	git_tree *index_tree = NULL;
	git_tree *index_parent_tree = NULL;
	git_tree *untracked_tree = NULL;
	git_index *stash_adds = NULL;
	git_index *repo_index = NULL;
	git_index *unstashed_index = NULL;
	git_index *modified_index = NULL;
	git_index *untracked_index = NULL;
	int error;

	GIT_ERROR_CHECK_VERSION(given_opts, GIT_STASH_APPLY_OPTIONS_VERSION, "git_stash_apply_options");

	normalize_apply_options(&opts, given_opts);
	checkout_strategy = opts.checkout_options.checkout_strategy;

	NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_LOADING_STASH);

	/* Retrieve commit corresponding to the given stash */
	if ((error = retrieve_stash_commit(&stash_commit, repo, index)) < 0)
		goto cleanup;

	/* Retrieve all trees in the stash */
	if ((error = retrieve_stash_trees(
			&stash_tree, &stash_parent_tree, &index_tree,
			&index_parent_tree, &untracked_tree, stash_commit)) < 0)
		goto cleanup;

	/* Load repo index */
	if ((error = git_repository_index(&repo_index, repo)) < 0)
		goto cleanup;

	NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_ANALYZE_INDEX);

	if ((error = ensure_clean_index(repo, repo_index)) < 0)
		goto cleanup;

	/* Restore index if required */
	if ((opts.flags & GIT_STASH_APPLY_REINSTATE_INDEX) &&
		git_oid_cmp(git_tree_id(stash_parent_tree), git_tree_id(index_tree))) {

		if ((error = merge_index_and_tree(
				&unstashed_index, repo, index_parent_tree, repo_index, index_tree)) < 0)
			goto cleanup;

		if (git_index_has_conflicts(unstashed_index)) {
			error = GIT_ECONFLICT;
			goto cleanup;
		}

	/* Otherwise, stage any new files in the stash tree.  (Note: their
	 * previously unstaged contents are staged, not the previously staged.)
	 */
	} else if ((opts.flags & GIT_STASH_APPLY_REINSTATE_INDEX) == 0) {
		if ((error = stage_new_files(
				&stash_adds, stash_parent_tree, stash_tree)) < 0 ||
			(error = merge_indexes(
				&unstashed_index, repo, stash_parent_tree, repo_index, stash_adds)) < 0)
			goto cleanup;
	}

	NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_ANALYZE_MODIFIED);

	/* Restore modified files in workdir */
	if ((error = merge_index_and_tree(
			&modified_index, repo, stash_parent_tree, repo_index, stash_tree)) < 0)
		goto cleanup;

	/* If applicable, restore untracked / ignored files in workdir */
	if (untracked_tree) {
		NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_ANALYZE_UNTRACKED);

		if ((error = merge_index_and_tree(&untracked_index, repo, NULL, repo_index, untracked_tree)) < 0)
			goto cleanup;
	}

	if (untracked_index) {
		opts.checkout_options.checkout_strategy |= GIT_CHECKOUT_DONT_UPDATE_INDEX;

		NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_CHECKOUT_UNTRACKED);

		if ((error = git_checkout_index(repo, untracked_index, &opts.checkout_options)) < 0)
			goto cleanup;

		opts.checkout_options.checkout_strategy = checkout_strategy;
	}


	/* If there are conflicts in the modified index, then we need to actually
	 * check that out as the repo's index.  Otherwise, we don't update the
	 * index.
	 */

	if (!git_index_has_conflicts(modified_index))
		opts.checkout_options.checkout_strategy |= GIT_CHECKOUT_DONT_UPDATE_INDEX;

	/* Check out the modified index using the existing repo index as baseline,
	 * so that existing modifications in the index can be rewritten even when
	 * checking out safely.
	 */
	opts.checkout_options.baseline_index = repo_index;

	NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED);

	if ((error = git_checkout_index(repo, modified_index, &opts.checkout_options)) < 0)
		goto cleanup;

	if (unstashed_index && !git_index_has_conflicts(modified_index)) {
		if ((error = git_index_read_index(repo_index, unstashed_index)) < 0)
			goto cleanup;
	}

	NOTIFY_PROGRESS(opts, GIT_STASH_APPLY_PROGRESS_DONE);

	error = git_index_write(repo_index);

cleanup:
	git_index_free(untracked_index);
	git_index_free(modified_index);
	git_index_free(unstashed_index);
	git_index_free(stash_adds);
	git_index_free(repo_index);
	git_tree_free(untracked_tree);
	git_tree_free(index_parent_tree);
	git_tree_free(index_tree);
	git_tree_free(stash_parent_tree);
	git_tree_free(stash_tree);
	git_commit_free(stash_commit);
	return error;
}