Continue implementation of git-diff

* Implemented git_diff_index_to_tree
* Reworked git_diff_options structure to handle more options
* Made most of the options in git_diff_options actually work
* Reorganized code a bit to remove some redundancy
* Added option parsing to examples/diff.c to test most options

1 files changed, 96 insertions, 0 deletions

diff --git a/tests-clar/diff/index.c b/tests-clar/diff/index.c
new file mode 100644
index 000000000..0941c7c21
--- /dev/null
+++ b/tests-clar/diff/index.c
@@ -0,0 +1,96 @@
+#include "clar_libgit2.h"
+#include "diff_helpers.h"
+
+static git_repository *g_repo = NULL;
+
+void test_diff_index__initialize(void)
+{
+	cl_fixture_sandbox("status");
+	cl_git_pass(p_rename("status/.gitted", "status/.git"));
+	cl_git_pass(git_repository_open(&g_repo, "status/.git"));
+}
+
+void test_diff_index__cleanup(void)
+{
+	git_repository_free(g_repo);
+	g_repo = NULL;
+	cl_fixture_cleanup("status");
+}
+
+void test_diff_index__0(void)
+{
+	/* grabbed a couple of commit oids from the history of the attr repo */
+	const char *a_commit = "26a125ee1bf"; /* the current HEAD */
+	const char *b_commit = "0017bd4ab1ec3"; /* the start */
+	git_tree *a = resolve_commit_oid_to_tree(g_repo, a_commit);
+	git_tree *b = resolve_commit_oid_to_tree(g_repo, b_commit);
+	git_diff_options opts = {0};
+	git_diff_list *diff = NULL;
+	diff_expects exp;
+
+	cl_assert(a);
+	cl_assert(b);
+
+	opts.context_lines = 1;
+	opts.interhunk_lines = 1;
+
+	memset(&exp, 0, sizeof(exp));
+
+	cl_git_pass(git_diff_index_to_tree(g_repo, &opts, a, &diff));
+
+	cl_git_pass(git_diff_foreach(
+		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	/* to generate these values:
+	 * - cd to tests/resources/status,
+	 * - mv .gitted .git
+	 * - git diff --name-status --cached 26a125ee1bf
+	 * - git diff -U1 --cached 26a125ee1bf
+	 * - mv .git .gitted
+	 */
+	cl_assert(exp.files == 8);
+	cl_assert(exp.file_adds == 3);
+	cl_assert(exp.file_dels == 2);
+	cl_assert(exp.file_mods == 3);
+
+	cl_assert(exp.hunks == 8);
+
+	cl_assert(exp.lines == 11);
+	cl_assert(exp.line_ctxt == 3);
+	cl_assert(exp.line_adds == 6);
+	cl_assert(exp.line_dels == 2);
+
+	git_diff_list_free(diff);
+	diff = NULL;
+	memset(&exp, 0, sizeof(exp));
+
+	cl_git_pass(git_diff_index_to_tree(g_repo, &opts, b, &diff));
+
+	cl_git_pass(git_diff_foreach(
+		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	/* to generate these values:
+	 * - cd to tests/resources/status,
+	 * - mv .gitted .git
+	 * - git diff --name-status --cached 0017bd4ab1ec3
+	 * - git diff -U1 --cached 0017bd4ab1ec3
+	 * - mv .git .gitted
+	 */
+	cl_assert(exp.files == 12);
+	cl_assert(exp.file_adds == 7);
+	cl_assert(exp.file_dels == 2);
+	cl_assert(exp.file_mods == 3);
+
+	cl_assert(exp.hunks == 12);
+
+	cl_assert(exp.lines == 16);
+	cl_assert(exp.line_ctxt == 3);
+	cl_assert(exp.line_adds == 11);
+	cl_assert(exp.line_dels == 2);
+
+	git_diff_list_free(diff);
+	diff = NULL;
+
+	git_tree_free(a);
+	git_tree_free(b);
+}