git_rebase: iterators for operations

include/git2/rebase.h

@@ -149,6 +149,33 @@ GIT_EXTERN(int) git_rebase_init(
  */
 GIT_EXTERN(int) git_rebase_open(git_rebase **out, git_repository *repo);
 
+/**
+ * Gets the count of rebase operations that are to be applied.
+ *
+ * @param rebase The in-progress rebase
+ * @return The number of rebase operations in total
+ */
+GIT_EXTERN(size_t) git_rebase_operation_entrycount(git_rebase *rebase);
+
+/**
+ * Gets the index of the rebase operation that is currently being applied.
+ *
+ * @param rebase The in-progress rebase
+ * @return The index of the rebase operation currently being applied.
+ */
+GIT_EXTERN(size_t) git_rebase_operation_current(git_rebase *rebase);
+
+/**
+ * Gets the rebase operation specified by the given index.
+ *
+ * @param rebase The in-progress rebase
+ * @param idx The index of the rebase operation to retrieve
+ * @return The rebase operation or NULL if `idx` was out of bounds
+ */
+GIT_EXTERN(git_rebase_operation *) git_rebase_operation_byindex(
+	git_rebase *rebase,
+	size_t idx);
+
 /**
  * Performs the next rebase operation and returns the information about it.
  * If the operation is one that applies a patch (which is any operation except

src/rebase.c

@@ -1087,6 +1087,27 @@ done:
 	return error;
 }
 
+size_t git_rebase_operation_entrycount(git_rebase *rebase)
+{
+	assert(rebase);
+
+	return git_array_size(rebase->operations);
+}
+
+size_t git_rebase_operation_current(git_rebase *rebase)
+{
+	assert(rebase);
+
+	return rebase->current;
+}
+
+git_rebase_operation *git_rebase_operation_byindex(git_rebase *rebase, size_t idx)
+{
+	assert(rebase);
+
+	return git_array_get(rebase->operations, idx);
+}
+
 void git_rebase_free(git_rebase *rebase)
 {
 	if (rebase == NULL)

tests/rebase/iterator.c

@@ -0,0 +1,108 @@
+#include "clar_libgit2.h"
+#include "git2/rebase.h"
+#include "posix.h"
+
+#include <fcntl.h>
+
+static git_repository *repo;
+static git_index *_index;
+static git_signature *signature;
+
+// Fixture setup and teardown
+void test_rebase_iterator__initialize(void)
+{
+	repo = cl_git_sandbox_init("rebase");
+	cl_git_pass(git_repository_index(&_index, repo));
+	cl_git_pass(git_signature_now(&signature, "Rebaser", "rebaser@rebaser.rb"));
+}
+
+void test_rebase_iterator__cleanup(void)
+{
+	git_signature_free(signature);
+	git_index_free(_index);
+	cl_git_sandbox_cleanup();
+}
+
+static void test_operations(git_rebase *rebase, size_t expected_current)
+{
+	size_t i, expected_count = 5;
+	git_oid expected_oid[5];
+	git_rebase_operation *operation;
+
+	git_oid_fromstr(&expected_oid[0], "da9c51a23d02d931a486f45ad18cda05cf5d2b94");
+	git_oid_fromstr(&expected_oid[1], "8d1f13f93c4995760ac07d129246ac1ff64c0be9");
+	git_oid_fromstr(&expected_oid[2], "3069cc907e6294623e5917ef6de663928c1febfb");
+	git_oid_fromstr(&expected_oid[3], "588e5d2f04d49707fe4aab865e1deacaf7ef6787");
+	git_oid_fromstr(&expected_oid[4], "b146bd7608eac53d9bf9e1a6963543588b555c64");
+
+	cl_assert_equal_i(expected_count, git_rebase_operation_entrycount(rebase));
+	cl_assert_equal_i(expected_current, git_rebase_operation_current(rebase));
+
+	for (i = 0; i < expected_count; i++) {
+		operation = git_rebase_operation_byindex(rebase, i);
+		cl_assert_equal_i(GIT_REBASE_OPERATION_PICK, operation->type);
+		cl_assert_equal_oid(&expected_oid[i], &operation->id);
+	}
+}
+
+void test_rebase_iterator__iterates(void)
+{
+	git_rebase *rebase;
+	git_reference *branch_ref, *upstream_ref;
+	git_merge_head *branch_head, *upstream_head;
+	git_rebase_operation *rebase_operation;
+	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
+	git_oid commit_id;
+	int error;
+
+	checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
+
+	cl_git_pass(git_reference_lookup(&branch_ref, repo, "refs/heads/beef"));
+	cl_git_pass(git_reference_lookup(&upstream_ref, repo, "refs/heads/master"));
+
+	cl_git_pass(git_merge_head_from_ref(&branch_head, repo, branch_ref));
+	cl_git_pass(git_merge_head_from_ref(&upstream_head, repo, upstream_ref));
+
+	cl_git_pass(git_rebase_init(&rebase, repo, branch_head, upstream_head, NULL, signature, NULL));
+	test_operations(rebase, 0);
+	git_rebase_free(rebase);
+
+	cl_git_pass(git_rebase_open(&rebase, repo));
+	cl_git_pass(git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature,
+		NULL, NULL));
+	test_operations(rebase, 0);
+
+	cl_git_pass(git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature,
+		NULL, NULL));
+	test_operations(rebase, 1);
+
+	cl_git_pass(git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature,
+		NULL, NULL));
+	test_operations(rebase, 2);
+
+	git_rebase_free(rebase);
+	cl_git_pass(git_rebase_open(&rebase, repo));
+
+	cl_git_pass(git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature,
+		NULL, NULL));
+	test_operations(rebase, 3);
+
+	cl_git_pass(git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature,
+		NULL, NULL));
+	test_operations(rebase, 4);
+
+	cl_git_fail(error = git_rebase_next(&rebase_operation, rebase, &checkout_opts));
+	cl_assert_equal_i(GIT_ITEROVER, error);
+	test_operations(rebase, 4);
+
+	git_merge_head_free(branch_head);
+	git_merge_head_free(upstream_head);
+	git_reference_free(branch_ref);
+	git_reference_free(upstream_ref);
+	git_rebase_free(rebase);
+}