thodg/libgit2/tests-clar/diff/rename.c

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• Hash : 88c401be
  Author :
  Date : 2013-06-12T14:54:32
  

  Merge pull request #1643 from ethomson/rename_source Keep data about source of similarity

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• tests-clar/diff/rename.c

• #include "clar_libgit2.h"
  #include "diff_helpers.h"
  #include "buf_text.h"
  
  static git_repository *g_repo = NULL;
  
  void test_diff_rename__initialize(void)
  {
  	g_repo = cl_git_sandbox_init("renames");
  }
  
  void test_diff_rename__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  /*
   * Renames repo has:
   *
   * commit 31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 -
   *   serving.txt     (25 lines)
   *   sevencities.txt (50 lines)
   * commit 2bc7f351d20b53f1c72c16c4b036e491c478c49a -
   *   serving.txt     -> sixserving.txt  (rename, no change, 100% match)
   *   sevencities.txt -> sevencities.txt (no change)
   *   sevencities.txt -> songofseven.txt (copy, no change, 100% match)
   * commit 1c068dee5790ef1580cfc4cd670915b48d790084
   *   songofseven.txt -> songofseven.txt (major rewrite, <20% match - split)
   *   sixserving.txt  -> sixserving.txt  (indentation change)
   *   sixserving.txt  -> ikeepsix.txt    (copy, add title, >80% match)
   *   sevencities.txt                    (no change)
   * commit 19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13
   *   songofseven.txt -> untimely.txt    (rename, convert to crlf)
   *   ikeepsix.txt    -> ikeepsix.txt    (reorder sections in file)
   *   sixserving.txt  -> sixserving.txt  (whitespace change - not just indent)
   *   sevencities.txt -> songof7cities.txt (rename, small text changes)
   */
  
  void test_diff_rename__match_oid(void)
  {
  	const char *old_sha = "31e47d8c1fa36d7f8d537b96158e3f024de0a9f2";
  	const char *new_sha = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	git_tree *old_tree, *new_tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  
  	old_tree = resolve_commit_oid_to_tree(g_repo, old_sha);
  	new_tree = resolve_commit_oid_to_tree(g_repo, new_sha);
  
  	/* Must pass GIT_DIFF_INCLUDE_UNMODIFIED if you expect to emulate
  	 * --find-copies-harder during rename transformion...
  	 */
  	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
  
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	/* git diff --no-renames \
  	 *          31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a
  	 */
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  
  	/* git diff 31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a
  	 * don't use NULL opts to avoid config `diff.renames` contamination
  	 */
  	opts.flags = GIT_DIFF_FIND_RENAMES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(3, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	/* git diff --find-copies-harder \
  	 *          31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a
  	 */
  	opts.flags = GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(3, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_COPIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  
  	git_tree_free(old_tree);
  	git_tree_free(new_tree);
  }
  
  void test_diff_rename__checks_options_version(void)
  {
  	const char *old_sha = "31e47d8c1fa36d7f8d537b96158e3f024de0a9f2";
  	const char *new_sha = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	git_tree *old_tree, *new_tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	const git_error *err;
  
  	old_tree = resolve_commit_oid_to_tree(g_repo, old_sha);
  	new_tree = resolve_commit_oid_to_tree(g_repo, new_sha);
  	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.version = 0;
  	cl_git_fail(git_diff_find_similar(diff, &opts));
  	err = giterr_last();
  	cl_assert_equal_i(GITERR_INVALID, err->klass);
  
  	giterr_clear();
  	opts.version = 1024;
  	cl_git_fail(git_diff_find_similar(diff, &opts));
  	err = giterr_last();
  	cl_assert_equal_i(GITERR_INVALID, err->klass);
  
  	git_diff_list_free(diff);
  	git_tree_free(old_tree);
  	git_tree_free(new_tree);
  }
  
  void test_diff_rename__not_exact_match(void)
  {
  	const char *sha0 = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	const char *sha1 = "1c068dee5790ef1580cfc4cd670915b48d790084";
  	const char *sha2 = "19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13";
  	git_tree *old_tree, *new_tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  
  	/* == Changes =====================================================
  	 * songofseven.txt -> songofseven.txt (major rewrite, <20% match - split)
  	 * sixserving.txt  -> sixserving.txt  (indentation change)
  	 * sixserving.txt  -> ikeepsix.txt    (copy, add title, >80% match)
  	 * sevencities.txt                    (no change)
  	 */
  
  	old_tree = resolve_commit_oid_to_tree(g_repo, sha0);
  	new_tree = resolve_commit_oid_to_tree(g_repo, sha1);
  
  	/* Must pass GIT_DIFF_INCLUDE_UNMODIFIED if you expect to emulate
  	 * --find-copies-harder during rename transformion...
  	 */
  	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
  
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	/* git diff --no-renames \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084
  	 */
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  
  	/* git diff -M 2bc7f351d20b53f1c72c16c4b036e491c478c49a \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084
  	 *
  	 * must not pass NULL for opts because it will pick up environment
  	 * values for "diff.renames" and test won't be consistent.
  	 */
  	opts.flags = GIT_DIFF_FIND_RENAMES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  
  	git_diff_list_free(diff);
  
  	/* git diff -M -C \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084
  	 */
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_COPIED]);
  
  	git_diff_list_free(diff);
  
  	/* git diff -M -C --find-copies-harder --break-rewrites \
  	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084
  	 */
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(5, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNMODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_COPIED]);
  
  	git_diff_list_free(diff);
  
  	/* == Changes =====================================================
  	 * songofseven.txt -> untimely.txt    (rename, convert to crlf)
  	 * ikeepsix.txt    -> ikeepsix.txt    (reorder sections in file)
  	 * sixserving.txt  -> sixserving.txt  (whitespace - not just indent)
  	 * sevencities.txt -> songof7cities.txt (rename, small text changes)
  	 */
  
  	git_tree_free(old_tree);
  	old_tree = new_tree;
  	new_tree = resolve_commit_oid_to_tree(g_repo, sha2);
  
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	/* git diff --no-renames \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084 \
  	 *          19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13
  	 */
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
  	git_diff_list_free(diff);
  
  	/* git diff -M -C \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084 \
  	 *          19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13
  	 */
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  
  	/* git diff -M -C --find-copies-harder --break-rewrites \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084 \
  	 *          19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13
  	 * with libgit2 default similarity comparison...
  	 */
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	/* the default match algorithm is going to find the internal
  	 * whitespace differences in the lines of sixserving.txt to be
  	 * significant enough that this will decide to split it into
  	 * an ADD and a DELETE
  	 */
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(5, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  
  	/* git diff -M -C --find-copies-harder --break-rewrites \
  	 *          1c068dee5790ef1580cfc4cd670915b48d790084 \
  	 *          19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13
  	 * with ignore_space whitespace comparision
  	 */
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL | GIT_DIFF_FIND_IGNORE_WHITESPACE;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	/* Ignoring whitespace, this should no longer split sixserver.txt */
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  
  	git_tree_free(old_tree);
  	git_tree_free(new_tree);
  }
  
  void test_diff_rename__handles_small_files(void)
  {
  	const char *tree_sha = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	git_index *index;
  	git_tree *tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  
  	tree = resolve_commit_oid_to_tree(g_repo, tree_sha);
  
  	cl_git_rewritefile("renames/songof7cities.txt", "single line\n");
  	cl_git_pass(git_index_add_bypath(index, "songof7cities.txt"));
  
  	cl_git_rewritefile("renames/untimely.txt", "untimely\n");
  	cl_git_pass(git_index_add_bypath(index, "untimely.txt"));
  
  	/* Tests that we can invoke find_similar on small files
  	 * and that the GIT_EBUFS (too small) error code is not
  	 * propagated to the caller.
  	 */
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES |
  		GIT_DIFF_FIND_AND_BREAK_REWRITES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	git_diff_list_free(diff);
  	git_tree_free(tree);
  	git_index_free(index);
  }
  
  void test_diff_rename__working_directory_changes(void)
  {
  	const char *sha0 = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	const char *blobsha = "66311f5cfbe7836c27510a3ba2f43e282e2c8bba";
  	git_oid id;
  	git_tree *tree;
  	git_blob *blob;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  	git_buf old_content = GIT_BUF_INIT, content = GIT_BUF_INIT;;
  
  	tree = resolve_commit_oid_to_tree(g_repo, sha0);
  	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED | GIT_DIFF_INCLUDE_UNTRACKED;
  
  	/*
  	$ git cat-file -p 2bc7f351d20b53f1c72c16c4b036e491c478c49a^{tree}
  
  	100644 blob 66311f5cfbe7836c27510a3ba2f43e282e2c8bba	sevencities.txt
  	100644 blob ad0a8e55a104ac54a8a29ed4b84b49e76837a113	sixserving.txt
  	100644 blob 66311f5cfbe7836c27510a3ba2f43e282e2c8bba	songofseven.txt
  
  	$ for f in *.txt; do
  		echo `git hash-object -t blob $f` $f
  	done
  
  	eaf4a3e3bfe68585e90cada20736ace491cd100b ikeepsix.txt
  	f90d4fc20ecddf21eebe6a37e9225d244339d2b5 sixserving.txt
  	4210ffd5c390b21dd5483375e75288dea9ede512 songof7cities.txt
  	9a69d960ae94b060f56c2a8702545e2bb1abb935 untimely.txt
  	*/
  
  	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
  
  	/* git diff --no-renames 2bc7f351d20b53f1c72c16c4b036e491c478c49a */
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_UNTRACKED]);
  
  	/* git diff -M 2bc7f351d20b53f1c72c16c4b036e491c478c49a */
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(5, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_UNTRACKED]);
  
  	git_diff_list_free(diff);
  
  	/* rewrite files in the working directory with / without CRLF changes */
  
  	cl_git_pass(
  		git_futils_readbuffer(&old_content, "renames/songof7cities.txt"));
  	cl_git_pass(
  		git_buf_text_lf_to_crlf(&content, &old_content));
  	cl_git_pass(
  		git_futils_writebuffer(&content, "renames/songof7cities.txt", 0, 0));
  
  	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
  
  	/* git diff -M 2bc7f351d20b53f1c72c16c4b036e491c478c49a */
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(5, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_UNTRACKED]);
  
  	git_diff_list_free(diff);
  
  	/* try a different whitespace option */
  
  	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL | GIT_DIFF_FIND_DONT_IGNORE_WHITESPACE;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_UNTRACKED]);
  
  	git_diff_list_free(diff);
  
  	/* try a different matching option */
  
  	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL | GIT_DIFF_FIND_EXACT_MATCH_ONLY;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_UNTRACKED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
  
  	git_diff_list_free(diff);
  
  	/* again with exact match blob */
  
  	cl_git_pass(git_oid_fromstr(&id, blobsha));
  	cl_git_pass(git_blob_lookup(&blob, g_repo, &id));
  	cl_git_pass(git_buf_set(
  		&content, git_blob_rawcontent(blob), git_blob_rawsize(blob)));
  	cl_git_rewritefile("renames/songof7cities.txt", content.ptr);
  	git_blob_free(blob);
  
  	cl_git_pass(git_diff_tree_to_workdir(&diff, g_repo, tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_ALL | GIT_DIFF_FIND_EXACT_MATCH_ONLY;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	/*
  	fprintf(stderr, "\n\n");
      diff_print_raw(stderr, diff);
  	*/
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  
  	cl_assert_equal_i(5, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_UNTRACKED]);
  
  	git_diff_list_free(diff);
  
  	git_tree_free(tree);
  	git_buf_free(&content);
  	git_buf_free(&old_content);
  }
  
  void test_diff_rename__patch(void)
  {
  	const char *sha0 = "2bc7f351d20b53f1c72c16c4b036e491c478c49a";
  	const char *sha1 = "1c068dee5790ef1580cfc4cd670915b48d790084";
  	git_tree *old_tree, *new_tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	git_diff_patch *patch;
  	const git_diff_delta *delta;
  	char *text;
  	const char *expected = "diff --git a/sixserving.txt b/ikeepsix.txt\nindex ad0a8e5..36020db 100644\n--- a/sixserving.txt\n+++ b/ikeepsix.txt\n@@ -1,3 +1,6 @@\n+I Keep Six Honest Serving-Men\n+=============================\n+\n I KEEP six honest serving-men\n  (They taught me all I knew);\n Their names are What and Why and When\n@@ -21,4 +24,4 @@ She sends'em abroad on her own affairs,\n One million Hows, two million Wheres,\n And seven million Whys!\n \n-                -- Rudyard Kipling\n+  -- Rudyard Kipling\n";
  
  	old_tree = resolve_commit_oid_to_tree(g_repo, sha0);
  	new_tree = resolve_commit_oid_to_tree(g_repo, sha1);
  
  	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
  	cl_git_pass(git_diff_tree_to_tree(
  		&diff, g_repo, old_tree, new_tree, &diffopts));
  
  	opts.flags = GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	/* == Changes =====================================================
  	 * sixserving.txt  -> ikeepsix.txt    (copy, add title, >80% match)
  	 * sevencities.txt                    (no change)
  	 * sixserving.txt  -> sixserving.txt  (indentation change)
  	 * songofseven.txt -> songofseven.txt (major rewrite, <20% match - split)
  	 */
  
  	cl_assert_equal_i(4, (int)git_diff_num_deltas(diff));
  
  	cl_git_pass(git_diff_get_patch(&patch, &delta, diff, 0));
  	cl_assert_equal_i(GIT_DELTA_COPIED, (int)delta->status);
  
  	cl_git_pass(git_diff_patch_to_str(&text, patch));
  	cl_assert_equal_s(expected, text);
  	git__free(text);
  
  	git_diff_patch_free(patch);
  
  	cl_git_pass(git_diff_get_patch(NULL, &delta, diff, 1));
  	cl_assert_equal_i(GIT_DELTA_UNMODIFIED, (int)delta->status);
  
  	cl_git_pass(git_diff_get_patch(NULL, &delta, diff, 2));
  	cl_assert_equal_i(GIT_DELTA_MODIFIED, (int)delta->status);
  
  	cl_git_pass(git_diff_get_patch(NULL, &delta, diff, 3));
  	cl_assert_equal_i(GIT_DELTA_MODIFIED, (int)delta->status);
  
  	git_diff_list_free(diff);
  	git_tree_free(old_tree);
  	git_tree_free(new_tree);
  }
  
  void test_diff_rename__file_exchange(void)
  {
  	git_buf c1 = GIT_BUF_INIT, c2 = GIT_BUF_INIT;
  	git_index *index;
  	git_tree *tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  
  	cl_git_pass(git_futils_readbuffer(&c1, "renames/untimely.txt"));
  	cl_git_pass(git_futils_readbuffer(&c2, "renames/songof7cities.txt"));
  	cl_git_pass(git_futils_writebuffer(&c1, "renames/songof7cities.txt", 0, 0));
  	cl_git_pass(git_futils_writebuffer(&c2, "renames/untimely.txt", 0, 0));
  
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_read_tree(index, tree));
  	cl_git_pass(git_index_add_bypath(index, "songof7cities.txt"));
  	cl_git_pass(git_index_add_bypath(index, "untimely.txt"));
  
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(2, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(2, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_RENAMED]);
  
  	git_diff_list_free(diff);
  	git_tree_free(tree);
  	git_index_free(index);
  
  	git_buf_free(&c1);
  	git_buf_free(&c2);
  }
  
  void test_diff_rename__file_partial_exchange(void)
  {
  	git_buf c1 = GIT_BUF_INIT, c2 = GIT_BUF_INIT;
  	git_index *index;
  	git_tree *tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  	int i;
  
  	cl_git_pass(git_futils_readbuffer(&c1, "renames/untimely.txt"));
  	cl_git_pass(git_futils_writebuffer(&c1, "renames/songof7cities.txt", 0, 0));
  	for (i = 0; i < 100; ++i)
  		cl_git_pass(git_buf_puts(&c2, "this is not the content you are looking for\n"));
  	cl_git_pass(git_futils_writebuffer(&c2, "renames/untimely.txt", 0, 0));
  
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_read_tree(index, tree));
  	cl_git_pass(git_index_add_bypath(index, "songof7cities.txt"));
  	cl_git_pass(git_index_add_bypath(index, "untimely.txt"));
  
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(2, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(3, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  
  	git_diff_list_free(diff);
  	git_tree_free(tree);
  	git_index_free(index);
  
  	git_buf_free(&c1);
  	git_buf_free(&c2);
  }
  
  void test_diff_rename__file_split(void)
  {
  	git_buf c1 = GIT_BUF_INIT, c2 = GIT_BUF_INIT;
  	git_index *index;
  	git_tree *tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  
  	/* put the first 2/3 of file into one new place
  	 * and the second 2/3 of file into another new place
  	 */
  	cl_git_pass(git_futils_readbuffer(&c1, "renames/songof7cities.txt"));
  	cl_git_pass(git_buf_set(&c2, c1.ptr, c1.size));
  	git_buf_truncate(&c1, c1.size * 2 / 3);
  	git_buf_consume(&c2, ((char *)c2.ptr) + (c2.size / 3));
  	cl_git_pass(git_futils_writebuffer(&c1, "renames/song_a.txt", 0, 0));
  	cl_git_pass(git_futils_writebuffer(&c2, "renames/song_b.txt", 0, 0));
  
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_read_tree(index, tree));
  	cl_git_pass(git_index_add_bypath(index, "song_a.txt"));
  	cl_git_pass(git_index_add_bypath(index, "song_b.txt"));
  
  	diffopts.flags = GIT_DIFF_INCLUDE_UNMODIFIED;
  
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
  	cl_assert_equal_i(4, exp.file_status[GIT_DELTA_UNMODIFIED]);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(6, exp.files);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_COPIED]);
  	cl_assert_equal_i(4, exp.file_status[GIT_DELTA_UNMODIFIED]);
  
  	git_diff_list_free(diff);
  	git_tree_free(tree);
  	git_index_free(index);
  
  	git_buf_free(&c1);
  	git_buf_free(&c2);
  }
  
  void test_diff_rename__from_deleted_to_split(void)
  {
  	git_buf c1 = GIT_BUF_INIT;
  	git_index *index;
  	git_tree *tree;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options opts = GIT_DIFF_FIND_OPTIONS_INIT;
  	diff_expects exp;
  
  	/* old file is missing, new file is actually old file renamed */
  
  	cl_git_pass(git_futils_readbuffer(&c1, "renames/songof7cities.txt"));
  	cl_git_pass(git_futils_writebuffer(&c1, "renames/untimely.txt", 0, 0));
  
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(git_repository_index(&index, g_repo));
  	cl_git_pass(git_index_read_tree(index, tree));
  	cl_git_pass(git_index_remove_bypath(index, "songof7cities.txt"));
  	cl_git_pass(git_index_add_bypath(index, "untimely.txt"));
  
  	diffopts.flags = GIT_DIFF_INCLUDE_UNMODIFIED;
  
  	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_UNMODIFIED]);
  
  	opts.flags = GIT_DIFF_FIND_ALL;
  	cl_git_pass(git_diff_find_similar(diff, &opts));
  
  	memset(&exp, 0, sizeof(exp));
  	cl_git_pass(git_diff_foreach(
  		diff, diff_file_cb, diff_hunk_cb, diff_line_cb, &exp));
  	cl_assert_equal_i(4, exp.files);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
  	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_RENAMED]);
  	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_UNMODIFIED]);
  
  	git_diff_list_free(diff);
  	git_tree_free(tree);
  	git_index_free(index);
  
  	git_buf_free(&c1);
  }
  
  struct rename_expected
  {
  	size_t len;
  	const char **sources;
  	const char **targets;
  
  	size_t idx;
  };
  
  int test_names_expected(const git_diff_delta *delta, float progress, void *p)
  {
  	struct rename_expected *expected = p;
  
  	cl_assert(expected->idx < expected->len);
  
  	cl_assert_equal_i(delta->status, GIT_DELTA_RENAMED);
  
  	cl_assert(git__strcmp(expected->sources[expected->idx],
  		delta->old_file.path) == 0);
  	cl_assert(git__strcmp(expected->targets[expected->idx],
  		delta->new_file.path) == 0);
  
  	expected->idx++;
  
  	return 0;
  }
  
  void test_diff_rename__rejected_match_can_match_others(void)
  {
  	git_reference *head, *selfsimilar;
  	git_index *index;
  	git_tree *tree;
  	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
  	git_diff_list *diff;
  	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
  	git_diff_find_options findopts = GIT_DIFF_FIND_OPTIONS_INIT;
  	git_buf one = GIT_BUF_INIT, two = GIT_BUF_INIT;
  	const char *sources[] = { "Class1.cs", "Class2.cs" };
  	const char *targets[] = { "ClassA.cs", "ClassB.cs" };
  	struct rename_expected expect = { 2, sources, targets };
  	char *ptr;
  
  	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
  
  	cl_git_pass(git_reference_lookup(&head, g_repo, "HEAD"));
  	cl_git_pass(git_reference_symbolic_set_target(
  		&selfsimilar, head, "refs/heads/renames_similar"));
  	cl_git_pass(git_checkout_head(g_repo, &opts));
  	cl_git_pass(git_repository_index(&index, g_repo));
  
  	cl_git_pass(git_futils_readbuffer(&one, "renames/Class1.cs"));
  	cl_git_pass(git_futils_readbuffer(&two, "renames/Class2.cs"));
  
  	cl_git_pass(p_unlink("renames/Class1.cs"));
  	cl_git_pass(p_unlink("renames/Class2.cs"));
  
  	cl_git_pass(git_index_remove_bypath(index, "Class1.cs"));
  	cl_git_pass(git_index_remove_bypath(index, "Class2.cs"));
  
  	cl_assert(ptr = strstr(one.ptr, "Class1"));
  	ptr[5] = 'A';
  
  	cl_assert(ptr = strstr(two.ptr, "Class2"));
  	ptr[5] = 'B';
  
  	cl_git_pass(
  		git_futils_writebuffer(&one, "renames/ClassA.cs", O_RDWR|O_CREAT, 0777));
  	cl_git_pass(
  		git_futils_writebuffer(&two, "renames/ClassB.cs", O_RDWR|O_CREAT, 0777));
  
  	cl_git_pass(git_index_add_bypath(index, "ClassA.cs"));
  	cl_git_pass(git_index_add_bypath(index, "ClassB.cs"));
  
  	cl_git_pass(git_index_write(index));
  
  	cl_git_pass(
  		git_revparse_single((git_object **)&tree, g_repo, "HEAD^{tree}"));
  
  	cl_git_pass(
  		git_diff_tree_to_index(&diff, g_repo, tree, index, &diffopts));
  	cl_git_pass(git_diff_find_similar(diff, &findopts));
  
  	cl_git_pass(
  		git_diff_foreach(diff, test_names_expected, NULL, NULL, &expect));
  
  	git_tree_free(tree);
  	git_index_free(index);
  	git_reference_free(head);
  	git_reference_free(selfsimilar);
  	git_buf_free(&one);
  	git_buf_free(&two);
  }
  

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