worktree: switch over worktree pruning to an opts structure

The current signature of `git_worktree_prune` accepts a flags field to
alter its behavior. This is not as flexible as we'd like it to be when
we want to enable passing additional options in the future. As the
function has not been part of any release yet, we are still free to
alter its current signature. This commit does so by using our usual
pattern of an options structure, which is easily extendable without
breaking the API.

include/git2/worktree.h

@@ -161,23 +161,44 @@ typedef enum {
 	GIT_WORKTREE_PRUNE_WORKING_TREE = 1u << 2,
 } git_worktree_prune_t;
 
+typedef struct git_worktree_prune_options {
+	unsigned int version;
+
+	uint32_t flags;
+} git_worktree_prune_options;
+
+#define GIT_WORKTREE_PRUNE_OPTIONS_VERSION 1
+#define GIT_WORKTREE_PRUNE_OPTIONS_INIT {GIT_WORKTREE_PRUNE_OPTIONS_VERSION,0}
+
+/**
+ * Initializes a `git_worktree_prune_options` with default vaules.
+ * Equivalent to creating an instance with
+ * GIT_WORKTREE_PRUNE_OPTIONS_INIT.
+ *
+ * @param opts the struct to initialize
+ * @param version Verison of struct; pass `GIT_WORKTREE_PRUNE_OPTIONS_VERSION`
+ * @return Zero on success; -1 on failure.
+ */
+GIT_EXTERN(int) git_worktree_prune_init_options(
+	git_worktree_prune_options *opts,
+	unsigned int version);
+
 /**
- * Is the worktree prunable with the given set of flags?
+ * Is the worktree prunable with the given options?
  *
  * A worktree is not prunable in the following scenarios:
  *
  * - the worktree is linking to a valid on-disk worktree. The
- *   GIT_WORKTREE_PRUNE_VALID flag will cause this check to be
- *   ignored.
- * - the worktree is not valid but locked. The
- *   GIT_WORKRTEE_PRUNE_LOCKED flag will cause this check to be
- *   ignored.
+ *   `valid` member will cause this check to be ignored.
+ * - the worktree is locked. The `locked` flag will cause this
+ *   check to be ignored.
  *
  * If the worktree is not valid and not locked or if the above
  * flags have been passed in, this function will return a
  * positive value.
  */
-GIT_EXTERN(int) git_worktree_is_prunable(git_worktree *wt, unsigned flags);
+GIT_EXTERN(int) git_worktree_is_prunable(git_worktree *wt,
+	git_worktree_prune_options *opts);
 
 /**
  * Prune working tree
@@ -187,10 +208,12 @@ GIT_EXTERN(int) git_worktree_is_prunable(git_worktree *wt, unsigned flags);
  * `git_worktree_is_prunable` succeeds.
  *
  * @param wt Worktree to prune
- * @param flags git_worktree_prune_t flags
+ * @param opts Specifies which checks to override. See
+ *        `git_worktree_is_prunable`. May be NULL
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_worktree_prune(git_worktree *wt, unsigned flags);
+GIT_EXTERN(int) git_worktree_prune(git_worktree *wt,
+	git_worktree_prune_options *opts);
 
 /** @} */
 GIT_END_DECL

src/worktree.c

@@ -456,11 +456,29 @@ out:
 	return ret;
 }
 
-int git_worktree_is_prunable(git_worktree *wt, unsigned flags)
+int git_worktree_prune_init_options(
+	git_worktree_prune_options *opts,
+	unsigned int version)
+{
+	GIT_INIT_STRUCTURE_FROM_TEMPLATE(opts, version,
+		git_worktree_prune_options, GIT_WORKTREE_PRUNE_OPTIONS_INIT);
+	return 0;
+}
+
+int git_worktree_is_prunable(git_worktree *wt,
+	git_worktree_prune_options *opts)
 {
 	git_buf reason = GIT_BUF_INIT;
+	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
+
+	GITERR_CHECK_VERSION(
+		opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
+		"git_worktree_prune_options");
+
+	if (opts)
+		memcpy(&popts, opts, sizeof(popts));
 
-	if ((flags & GIT_WORKTREE_PRUNE_LOCKED) == 0 &&
+	if ((popts.flags & GIT_WORKTREE_PRUNE_LOCKED) == 0 &&
 		git_worktree_is_locked(&reason, wt))
 	{
 		if (!reason.size)
@@ -471,7 +489,7 @@ int git_worktree_is_prunable(git_worktree *wt, unsigned flags)
 		return 0;
 	}
 
-	if ((flags & GIT_WORKTREE_PRUNE_VALID) == 0 &&
+	if ((popts.flags & GIT_WORKTREE_PRUNE_VALID) == 0 &&
 		git_worktree_validate(wt) == 0)
 	{
 		giterr_set(GITERR_WORKTREE, "Not pruning valid working tree");
@@ -481,13 +499,22 @@ int git_worktree_is_prunable(git_worktree *wt, unsigned flags)
 	return 1;
 }
 
-int git_worktree_prune(git_worktree *wt, unsigned flags)
+int git_worktree_prune(git_worktree *wt,
+	git_worktree_prune_options *opts)
 {
+	git_worktree_prune_options popts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_buf path = GIT_BUF_INIT;
 	char *wtpath;
 	int err;
 
-	if (!git_worktree_is_prunable(wt, flags)) {
+	GITERR_CHECK_VERSION(
+		opts, GIT_WORKTREE_PRUNE_OPTIONS_VERSION,
+		"git_worktree_prune_options");
+
+	if (opts)
+		memcpy(&popts, opts, sizeof(popts));
+
+	if (!git_worktree_is_prunable(wt, &popts)) {
 		err = -1;
 		goto out;
 	}
@@ -506,7 +533,7 @@ int git_worktree_prune(git_worktree *wt, unsigned flags)
 
 	/* Skip deletion of the actual working tree if it does
 	 * not exist or deletion was not requested */
-	if ((flags & GIT_WORKTREE_PRUNE_WORKING_TREE) == 0 ||
+	if ((popts.flags & GIT_WORKTREE_PRUNE_WORKING_TREE) == 0 ||
 		!git_path_exists(wt->gitlink_path))
 	{
 		goto out;

tests/worktree/refs.c

@@ -118,11 +118,14 @@ void test_worktree_refs__delete_fails_for_checked_out_branch(void)
 
 void test_worktree_refs__delete_succeeds_after_pruning_worktree(void)
 {
+	git_worktree_prune_options opts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_reference *branch;
 	git_worktree *worktree;
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID;
+
 	cl_git_pass(git_worktree_lookup(&worktree, fixture.repo, fixture.worktreename));
-	cl_git_pass(git_worktree_prune(worktree, GIT_WORKTREE_PRUNE_VALID));
+	cl_git_pass(git_worktree_prune(worktree, &opts));
 	git_worktree_free(worktree);
 
 	cl_git_pass(git_branch_lookup(&branch, fixture.repo,

tests/worktree/worktree.c

@@ -454,13 +454,31 @@ void test_worktree_worktree__unlock_locked_worktree(void)
 	git_worktree_free(wt);
 }
 
+void test_worktree_worktree__prune_without_opts_fails(void)
+{
+	git_worktree *wt;
+	git_repository *repo;
+
+	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
+	cl_git_fail(git_worktree_prune(wt, NULL));
+
+	/* Assert the repository is still valid */
+	cl_git_pass(git_repository_open_from_worktree(&repo, wt));
+
+	git_worktree_free(wt);
+	git_repository_free(repo);
+}
+
 void test_worktree_worktree__prune_valid(void)
 {
+	git_worktree_prune_options opts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_worktree *wt;
 	git_repository *repo;
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID;
+
 	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
-	cl_git_pass(git_worktree_prune(wt, GIT_WORKTREE_PRUNE_VALID));
+	cl_git_pass(git_worktree_prune(wt, &opts));
 
 	/* Assert the repository is not valid anymore */
 	cl_git_fail(git_repository_open_from_worktree(&repo, wt));
@@ -471,27 +489,33 @@ void test_worktree_worktree__prune_valid(void)
 
 void test_worktree_worktree__prune_locked(void)
 {
+	git_worktree_prune_options opts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_worktree *wt;
 	git_repository *repo;
 
 	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
 	cl_git_pass(git_worktree_lock(wt, NULL));
-	cl_git_fail(git_worktree_prune(wt, GIT_WORKTREE_PRUNE_VALID));
-	cl_git_fail(git_worktree_prune(wt, ~GIT_WORKTREE_PRUNE_LOCKED));
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID;
+	cl_git_fail(git_worktree_prune(wt, &opts));
 	/* Assert the repository is still valid */
 	cl_git_pass(git_repository_open_from_worktree(&repo, wt));
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID|GIT_WORKTREE_PRUNE_LOCKED;
+	cl_git_pass(git_worktree_prune(wt, &opts));
+
 	git_worktree_free(wt);
 	git_repository_free(repo);
 }
 
-void test_worktree_worktree__prune_gitdir(void)
+void test_worktree_worktree__prune_gitdir_only(void)
 {
+	git_worktree_prune_options opts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_worktree *wt;
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID;
 	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
-	cl_git_pass(git_worktree_prune(wt, GIT_WORKTREE_PRUNE_VALID));
+	cl_git_pass(git_worktree_prune(wt, &opts));
 
 	cl_assert(!git_path_exists(wt->gitdir_path));
 	cl_assert(git_path_exists(wt->gitlink_path));
@@ -499,12 +523,15 @@ void test_worktree_worktree__prune_gitdir(void)
 	git_worktree_free(wt);
 }
 
-void test_worktree_worktree__prune_both(void)
+void test_worktree_worktree__prune_worktree(void)
 {
+	git_worktree_prune_options opts = GIT_WORKTREE_PRUNE_OPTIONS_INIT;
 	git_worktree *wt;
 
+	opts.flags = GIT_WORKTREE_PRUNE_VALID|GIT_WORKTREE_PRUNE_WORKING_TREE;
+
 	cl_git_pass(git_worktree_lookup(&wt, fixture.repo, "testrepo-worktree"));
-	cl_git_pass(git_worktree_prune(wt, GIT_WORKTREE_PRUNE_WORKING_TREE | GIT_WORKTREE_PRUNE_VALID));
+	cl_git_pass(git_worktree_prune(wt, &opts));
 
 	cl_assert(!git_path_exists(wt->gitdir_path));
 	cl_assert(!git_path_exists(wt->gitlink_path));