Merge pull request #1014 from arrbee/diff-rename-detection

Initial implementation of diff rename detection

30 files changed, 989 insertions, 347 deletions

diff --git a/include/git2/diff.h b/include/git2/diff.h
index 4e80bed56..9b11f169b 100644
--- a/include/git2/diff.h
+++ b/include/git2/diff.h
@@ -33,7 +33,7 @@ GIT_BEGIN_DECL
  * Flags for diff options.  A combination of these flags can be passed
  * in via the `flags` value in the `git_diff_options`.
  */
-enum {
+typedef enum {
 	/** Normal diff, the default */
 	GIT_DIFF_NORMAL = 0,
 	/** Reverse the sides of the diff */
@@ -86,7 +86,7 @@ enum {
 	 *  mode set to tree.  Note: the tree SHA will not be available.
 	 */
 	GIT_DIFF_INCLUDE_TYPECHANGE_TREES  = (1 << 16),
-};
+} git_diff_option_t;
 
 /**
  * Structure describing options about how the diff should be executed.
@@ -95,7 +95,7 @@ enum {
  * values.  Similarly, passing NULL for the options structure will
  * give the defaults.  The default values are marked below.
  *
- * - flags: a combination of the GIT_DIFF_... values above
+ * - flags: a combination of the git_diff_option_t values above
  * - context_lines: number of lines of context to show around diffs
  * - interhunk_lines: min lines between diff hunks to merge them
  * - old_prefix: "directory" to prefix to old file names (default "a")
@@ -124,7 +124,7 @@ typedef struct git_diff_list git_diff_list;
  * Most of the flags are just for internal consumption by libgit2,
  * but some of them may be interesting to external users.
  */
-enum {
+typedef enum {
 	GIT_DIFF_FILE_VALID_OID  = (1 << 0), /** `oid` value is known correct */
 	GIT_DIFF_FILE_FREE_PATH  = (1 << 1), /** `path` is allocated memory */
 	GIT_DIFF_FILE_BINARY     = (1 << 2), /** should be considered binary data */
@@ -132,7 +132,7 @@ enum {
 	GIT_DIFF_FILE_FREE_DATA  = (1 << 4), /** internal file data is allocated */
 	GIT_DIFF_FILE_UNMAP_DATA = (1 << 5), /** internal file data is mmap'ed */
 	GIT_DIFF_FILE_NO_DATA    = (1 << 6), /** file data should not be loaded */
-};
+} git_diff_file_flag_t;
 
 /**
  * What type of change is described by a git_diff_delta?
@@ -218,7 +218,7 @@ typedef int (*git_diff_hunk_fn)(
  * output callbacks to demarcate lines that are actually part of
  * the file or hunk headers.
  */
-enum {
+typedef enum {
 	/* These values will be sent to `git_diff_data_fn` along with the line */
 	GIT_DIFF_LINE_CONTEXT   = ' ',
 	GIT_DIFF_LINE_ADDITION  = '+',
@@ -233,7 +233,7 @@ enum {
 	GIT_DIFF_LINE_FILE_HDR  = 'F',
 	GIT_DIFF_LINE_HUNK_HDR  = 'H',
 	GIT_DIFF_LINE_BINARY    = 'B'
-};
+} git_diff_line_t;
 
 /**
  * When iterating over a diff, callback that will be made per text diff
@@ -259,6 +259,46 @@ typedef int (*git_diff_data_fn)(
  */
 typedef struct git_diff_patch git_diff_patch;
 
+/**
+ * Flags to control the behavior of diff rename/copy detection.
+ */
+typedef enum {
+	/** look for renames? (`--find-renames`) */
+	GIT_DIFF_FIND_RENAMES = (1 << 0),
+	/** consider old size of modified for renames? (`--break-rewrites=N`) */
+	GIT_DIFF_FIND_RENAMES_FROM_REWRITES = (1 << 1),
+
+	/** look for copies? (a la `--find-copies`) */
+	GIT_DIFF_FIND_COPIES = (1 << 2),
+	/** consider unmodified as copy sources? (`--find-copies-harder`) */
+	GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED = (1 << 3),
+
+	/** split large rewrites into delete/add pairs (`--break-rewrites=/M`) */
+	GIT_DIFF_FIND_AND_BREAK_REWRITES = (1 << 4),
+} git_diff_find_t;
+
+/**
+ * Control behavior of rename and copy detection
+ */
+typedef struct {
+	/** Combination of git_diff_find_t values (default FIND_RENAMES) */
+	unsigned int flags;
+
+	/** Similarity to consider a file renamed (default 50) */
+	unsigned int rename_threshold;
+	/** Similarity of modified to be eligible rename source (default 50) */
+	unsigned int rename_from_rewrite_threshold;
+	/** Similarity to consider a file a copy (default 50) */
+	unsigned int copy_threshold;
+	/** Similarity to split modify into delete/add pair (default 60) */
+	unsigned int break_rewrite_threshold;
+
+	/** Maximum similarity sources to examine (a la diff's `-l` option or
+	 *  the `diff.renameLimit` config) (default 200)
+	 */
+	unsigned int target_limit;
+} git_diff_find_options;
+
 
 /** @name Diff List Generator Functions
  *
@@ -374,6 +414,22 @@ GIT_EXTERN(int) git_diff_merge(
 	git_diff_list *onto,
 	const git_diff_list *from);
 
+/**
+ * Transform a diff list marking file renames, copies, etc.
+ *
+ * This modifies a diff list in place, replacing old entries that look
+ * like renames or copies with new entries reflecting those changes.
+ * This also will, if requested, break modified files into add/remove
+ * pairs if the amount of change is above a threshold.
+ *
+ * @param diff Diff list to run detection algorithms on
+ * @param options Control how detection should be run, NULL for defaults
+ * @return 0 on success, -1 on failure
+ */
+GIT_EXTERN(int) git_diff_find_similar(
+	git_diff_list *diff,
+	git_diff_find_options *options);
+
 /**@}*/
 
 
diff --git a/src/diff.c b/src/diff.c
index 9f693bebf..55f6ee7d5 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -110,85 +110,6 @@ static git_diff_delta *diff_delta__alloc(
 	return delta;
 }
 
-static git_diff_delta *diff_delta__dup(
-	const git_diff_delta *d, git_pool *pool)
-{
-	git_diff_delta *delta = git__malloc(sizeof(git_diff_delta));
-	if (!delta)
-		return NULL;
-
-	memcpy(delta, d, sizeof(git_diff_delta));
-
-	delta->old_file.path = git_pool_strdup(pool, d->old_file.path);
-	if (delta->old_file.path == NULL)
-		goto fail;
-
-	if (d->new_file.path != d->old_file.path) {
-		delta->new_file.path = git_pool_strdup(pool, d->new_file.path);
-		if (delta->new_file.path == NULL)
-			goto fail;
-	} else {
-		delta->new_file.path = delta->old_file.path;
-	}
-
-	return delta;
-
-fail:
-	git__free(delta);
-	return NULL;
-}
-
-static git_diff_delta *diff_delta__merge_like_cgit(
-	const git_diff_delta *a, const git_diff_delta *b, git_pool *pool)
-{
-	git_diff_delta *dup;
-
-	/* Emulate C git for merging two diffs (a la 'git diff <sha>').
-	 *
-	 * When C git does a diff between the work dir and a tree, it actually
-	 * diffs with the index but uses the workdir contents.  This emulates
-	 * those choices so we can emulate the type of diff.
-	 *
-	 * We have three file descriptions here, let's call them:
-	 *  f1 = a->old_file
-	 *  f2 = a->new_file AND b->old_file
-	 *  f3 = b->new_file
-	 */
-
-	/* if f2 == f3 or f2 is deleted, then just dup the 'a' diff */
-	if (b->status == GIT_DELTA_UNMODIFIED || a->status == GIT_DELTA_DELETED)
-		return diff_delta__dup(a, pool);
-
-	/* otherwise, base this diff on the 'b' diff */
-	if ((dup = diff_delta__dup(b, pool)) == NULL)
-		return NULL;
-
-	/* If 'a' status is uninteresting, then we're done */
-	if (a->status == GIT_DELTA_UNMODIFIED)
-		return dup;
-
-	assert(a->status != GIT_DELTA_UNMODIFIED);
-	assert(b->status != GIT_DELTA_UNMODIFIED);
-
-	/* A cgit exception is that the diff of a file that is only in the
-	 * index (i.e. not in HEAD nor workdir) is given as empty.
-	 */
-	if (dup->status == GIT_DELTA_DELETED) {
-		if (a->status == GIT_DELTA_ADDED)
-			dup->status = GIT_DELTA_UNMODIFIED;
-		/* else don't overwrite DELETE status */
-	} else {
-		dup->status = a->status;
-	}
-
-	git_oid_cpy(&dup->old_file.oid, &a->old_file.oid);
-	dup->old_file.mode  = a->old_file.mode;
-	dup->old_file.size  = a->old_file.size;
-	dup->old_file.flags = a->old_file.flags;
-
-	return dup;
-}
-
 static int diff_delta__from_one(
 	git_diff_list *diff,
 	git_delta_t   status,
@@ -332,13 +253,34 @@ static char *diff_strdup_prefix(git_pool *pool, const char *prefix)
 		return git_pool_strndup(pool, prefix, len + 1);
 }
 
-static int diff_delta__cmp(const void *a, const void *b)
+int git_diff_delta__cmp(const void *a, const void *b)
 {
 	const git_diff_delta *da = a, *db = b;
 	int val = strcmp(da->old_file.path, db->old_file.path);
 	return val ? val : ((int)da->status - (int)db->status);
 }
 
+bool git_diff_delta__should_skip(
+	const git_diff_options *opts, const git_diff_delta *delta)
+{
+	uint32_t flags = opts ? opts->flags : 0;
+
+	if (delta->status == GIT_DELTA_UNMODIFIED &&
+		(flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)
+		return true;
+
+	if (delta->status == GIT_DELTA_IGNORED &&
+		(flags & GIT_DIFF_INCLUDE_IGNORED) == 0)
+		return true;
+
+	if (delta->status == GIT_DELTA_UNTRACKED &&
+		(flags & GIT_DIFF_INCLUDE_UNTRACKED) == 0)
+		return true;
+
+	return false;
+}
+
+
 static int config_bool(git_config *cfg, const char *name, int defvalue)
 {
 	int val = defvalue;
@@ -361,7 +303,7 @@ static git_diff_list *git_diff_list_alloc(
 	GIT_REFCOUNT_INC(diff);
 	diff->repo = repo;
 
-	if (git_vector_init(&diff->deltas, 0, diff_delta__cmp) < 0 ||
+	if (git_vector_init(&diff->deltas, 0, git_diff_delta__cmp) < 0 ||
 		git_pool_init(&diff->pool, 1, 0) < 0)
 		goto fail;
 
@@ -378,12 +320,23 @@ static git_diff_list *git_diff_list_alloc(
 		diff->diffcaps = diff->diffcaps | GIT_DIFFCAPS_TRUST_CTIME;
 	/* Don't set GIT_DIFFCAPS_USE_DEV - compile time option in core git */
 
+	/* TODO: there are certain config settings where even if we were
+	 * not given an options structure, we need the diff list to have one
+	 * so that we can store the altered default values.
+	 *
+	 * - diff.ignoreSubmodules
+	 * - diff.mnemonicprefix
+	 * - diff.noprefix
+	 */
+
 	if (opts == NULL)
 		return diff;
 
 	memcpy(&diff->opts, opts, sizeof(git_diff_options));
 	memset(&diff->opts.pathspec, 0, sizeof(diff->opts.pathspec));
 
+	/* TODO: handle config diff.mnemonicprefix, diff.noprefix */
+
 	diff->opts.old_prefix = diff_strdup_prefix(&diff->pool,
 		opts->old_prefix ? opts->old_prefix : DIFF_OLD_PREFIX_DEFAULT);
 	diff->opts.new_prefix = diff_strdup_prefix(&diff->pool,
@@ -980,105 +933,3 @@ on_error:
 	git_iterator_free(a);
 	return error;
 }
-
-
-bool git_diff_delta__should_skip(
-	const git_diff_options *opts, const git_diff_delta *delta)
-{
-	uint32_t flags = opts ? opts->flags : 0;
-
-	if (delta->status == GIT_DELTA_UNMODIFIED &&
-		(flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)
-		return true;
-
-	if (delta->status == GIT_DELTA_IGNORED &&
-		(flags & GIT_DIFF_INCLUDE_IGNORED) == 0)
-		return true;
-
-	if (delta->status == GIT_DELTA_UNTRACKED &&
-		(flags & GIT_DIFF_INCLUDE_UNTRACKED) == 0)
-		return true;
-
-	return false;
-}
-
-
-int git_diff_merge(
-	git_diff_list *onto,
-	const git_diff_list *from)
-{
-	int error = 0;
-	git_pool onto_pool;
-	git_vector onto_new;
-	git_diff_delta *delta;
-	bool ignore_case = false;
-	unsigned int i, j;
-
-	assert(onto && from);
-
-	if (!from->deltas.length)
-		return 0;
-
-	if (git_vector_init(&onto_new, onto->deltas.length, diff_delta__cmp) < 0 ||
-		git_pool_init(&onto_pool, 1, 0) < 0)
-		return -1;
-
-	if ((onto->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0 ||
-		(from->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0)
-	{
-		ignore_case = true;
-
-		/* This function currently only supports merging diff lists that
-		 * are sorted identically. */
-		assert((onto->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0 &&
-				(from->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0);
-	}
-
-	for (i = 0, j = 0; i < onto->deltas.length || j < from->deltas.length; ) {
-		git_diff_delta *o = GIT_VECTOR_GET(&onto->deltas, i);
-		const git_diff_delta *f = GIT_VECTOR_GET(&from->deltas, j);
-		int cmp = !f ? -1 : !o ? 1 : STRCMP_CASESELECT(ignore_case, o->old_file.path, f->old_file.path);
-
-		if (cmp < 0) {
-			delta = diff_delta__dup(o, &onto_pool);
-			i++;
-		} else if (cmp > 0) {
-			delta = diff_delta__dup(f, &onto_pool);
-			j++;
-		} else {
-			delta = diff_delta__merge_like_cgit(o, f, &onto_pool);
-			i++;
-			j++;
-		}
-
-		/* the ignore rules for the target may not match the source
-		 * or the result of a merged delta could be skippable...
-		 */
-		if (git_diff_delta__should_skip(&onto->opts, delta)) {
-			git__free(delta);
-			continue;
-		}
-
-		if ((error = !delta ? -1 : git_vector_insert(&onto_new, delta)) < 0)
-			break;
-	}
-
-	if (!error) {
-		git_vector_swap(&onto->deltas, &onto_new);
-		git_pool_swap(&onto->pool, &onto_pool);
-		onto->new_src = from->new_src;
-
-		/* prefix strings also come from old pool, so recreate those.*/
-		onto->opts.old_prefix =
-			git_pool_strdup_safe(&onto->pool, onto->opts.old_prefix);
-		onto->opts.new_prefix =
-			git_pool_strdup_safe(&onto->pool, onto->opts.new_prefix);
-	}
-
-	git_vector_foreach(&onto_new, i, delta)
-		git__free(delta);
-	git_vector_free(&onto_new);
-	git_pool_clear(&onto_pool);
-
-	return error;
-}
diff --git a/src/diff.h b/src/diff.h
index c6a26aee7..ed66439bf 100644
--- a/src/diff.h
+++ b/src/diff.h
@@ -28,6 +28,9 @@ enum {
 	GIT_DIFFCAPS_USE_DEV          = (1 << 4), /* use st_dev? */
 };
 
+#define GIT_DELTA__TO_DELETE 10
+#define GIT_DELTA__TO_SPLIT  11
+
 struct git_diff_list {
 	git_refcount     rc;
 	git_repository   *repo;
@@ -45,6 +48,8 @@ extern void git_diff__cleanup_modes(
 
 extern void git_diff_list_addref(git_diff_list *diff);
 
+extern int git_diff_delta__cmp(const void *a, const void *b);
+
 extern bool git_diff_delta__should_skip(
 	const git_diff_options *opts, const git_diff_delta *delta);
 
diff --git a/src/diff_tform.c b/src/diff_tform.c
new file mode 100644
index 000000000..987d4b8e6
--- /dev/null
+++ b/src/diff_tform.c
@@ -0,0 +1,466 @@
+/*
+ * Copyright (C) 2012 the libgit2 contributors
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#include "common.h"
+#include "diff.h"
+#include "git2/config.h"
+
+static git_diff_delta *diff_delta__dup(
+	const git_diff_delta *d, git_pool *pool)
+{
+	git_diff_delta *delta = git__malloc(sizeof(git_diff_delta));
+	if (!delta)
+		return NULL;
+
+	memcpy(delta, d, sizeof(git_diff_delta));
+
+	delta->old_file.path = git_pool_strdup(pool, d->old_file.path);
+	if (delta->old_file.path == NULL)
+		goto fail;
+
+	if (d->new_file.path != d->old_file.path) {
+		delta->new_file.path = git_pool_strdup(pool, d->new_file.path);
+		if (delta->new_file.path == NULL)
+			goto fail;
+	} else {
+		delta->new_file.path = delta->old_file.path;
+	}
+
+	return delta;
+
+fail:
+	git__free(delta);
+	return NULL;
+}
+
+static git_diff_delta *diff_delta__merge_like_cgit(
+	const git_diff_delta *a, const git_diff_delta *b, git_pool *pool)
+{
+	git_diff_delta *dup;
+
+	/* Emulate C git for merging two diffs (a la 'git diff <sha>').
+	 *
+	 * When C git does a diff between the work dir and a tree, it actually
+	 * diffs with the index but uses the workdir contents.  This emulates
+	 * those choices so we can emulate the type of diff.
+	 *
+	 * We have three file descriptions here, let's call them:
+	 *  f1 = a->old_file
+	 *  f2 = a->new_file AND b->old_file
+	 *  f3 = b->new_file
+	 */
+
+	/* if f2 == f3 or f2 is deleted, then just dup the 'a' diff */
+	if (b->status == GIT_DELTA_UNMODIFIED || a->status == GIT_DELTA_DELETED)
+		return diff_delta__dup(a, pool);
+
+	/* otherwise, base this diff on the 'b' diff */
+	if ((dup = diff_delta__dup(b, pool)) == NULL)
+		return NULL;
+
+	/* If 'a' status is uninteresting, then we're done */
+	if (a->status == GIT_DELTA_UNMODIFIED)
+		return dup;
+
+	assert(a->status != GIT_DELTA_UNMODIFIED);
+	assert(b->status != GIT_DELTA_UNMODIFIED);
+
+	/* A cgit exception is that the diff of a file that is only in the
+	 * index (i.e. not in HEAD nor workdir) is given as empty.
+	 */
+	if (dup->status == GIT_DELTA_DELETED) {
+		if (a->status == GIT_DELTA_ADDED)
+			dup->status = GIT_DELTA_UNMODIFIED;
+		/* else don't overwrite DELETE status */
+	} else {
+		dup->status = a->status;
+	}
+
+	git_oid_cpy(&dup->old_file.oid, &a->old_file.oid);
+	dup->old_file.mode  = a->old_file.mode;
+	dup->old_file.size  = a->old_file.size;
+	dup->old_file.flags = a->old_file.flags;
+
+	return dup;
+}
+
+int git_diff_merge(
+	git_diff_list *onto,
+	const git_diff_list *from)
+{
+	int error = 0;
+	git_pool onto_pool;
+	git_vector onto_new;
+	git_diff_delta *delta;
+	bool ignore_case = false;
+	unsigned int i, j;
+
+	assert(onto && from);
+
+	if (!from->deltas.length)
+		return 0;
+
+	if (git_vector_init(
+			&onto_new, onto->deltas.length, git_diff_delta__cmp) < 0 ||
+		git_pool_init(&onto_pool, 1, 0) < 0)
+		return -1;
+
+	if ((onto->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0 ||
+		(from->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0)
+	{
+		ignore_case = true;
+
+		/* This function currently only supports merging diff lists that
+		 * are sorted identically. */
+		assert((onto->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0 &&
+				(from->opts.flags & GIT_DIFF_DELTAS_ARE_ICASE) != 0);
+	}
+
+	for (i = 0, j = 0; i < onto->deltas.length || j < from->deltas.length; ) {
+		git_diff_delta *o = GIT_VECTOR_GET(&onto->deltas, i);
+		const git_diff_delta *f = GIT_VECTOR_GET(&from->deltas, j);
+		int cmp = !f ? -1 : !o ? 1 : STRCMP_CASESELECT(ignore_case, o->old_file.path, f->old_file.path);
+
+		if (cmp < 0) {
+			delta = diff_delta__dup(o, &onto_pool);
+			i++;
+		} else if (cmp > 0) {
+			delta = diff_delta__dup(f, &onto_pool);
+			j++;
+		} else {
+			delta = diff_delta__merge_like_cgit(o, f, &onto_pool);
+			i++;
+			j++;
+		}
+
+		/* the ignore rules for the target may not match the source
+		 * or the result of a merged delta could be skippable...
+		 */
+		if (git_diff_delta__should_skip(&onto->opts, delta)) {
+			git__free(delta);
+			continue;
+		}
+
+		if ((error = !delta ? -1 : git_vector_insert(&onto_new, delta)) < 0)
+			break;
+	}
+
+	if (!error) {
+		git_vector_swap(&onto->deltas, &onto_new);
+		git_pool_swap(&onto->pool, &onto_pool);
+		onto->new_src = from->new_src;
+
+		/* prefix strings also come from old pool, so recreate those.*/
+		onto->opts.old_prefix =
+			git_pool_strdup_safe(&onto->pool, onto->opts.old_prefix);
+		onto->opts.new_prefix =
+			git_pool_strdup_safe(&onto->pool, onto->opts.new_prefix);
+	}
+
+	git_vector_foreach(&onto_new, i, delta)
+		git__free(delta);
+	git_vector_free(&onto_new);
+	git_pool_clear(&onto_pool);
+
+	return error;
+}
+
+#define DEFAULT_THRESHOLD 50
+#define DEFAULT_BREAK_REWRITE_THRESHOLD 60
+#define DEFAULT_TARGET_LIMIT 200
+
+static int normalize_find_opts(
+	git_diff_list *diff,
+	git_diff_find_options *opts,
+	git_diff_find_options *given)
+{
+	git_config *cfg = NULL;
+	const char *val;
+
+	if (diff->repo != NULL &&
+		git_repository_config__weakptr(&cfg, diff->repo) < 0)
+		return -1;
+
+	if (given != NULL)
+		memcpy(opts, given, sizeof(*opts));
+	else {
+		memset(opts, 0, sizeof(*opts));
+
+		opts->flags = GIT_DIFF_FIND_RENAMES;
+
+		if (git_config_get_string(&val, cfg, "diff.renames") < 0)
+			giterr_clear();
+		else if (val &&
+			(!strcasecmp(val, "copies") || !strcasecmp(val, "copy")))
+			opts->flags = GIT_DIFF_FIND_RENAMES | GIT_DIFF_FIND_COPIES;
+	}
+
+	/* some flags imply others */
+
+	if (opts->flags & GIT_DIFF_FIND_RENAMES_FROM_REWRITES)
+		opts->flags |= GIT_DIFF_FIND_RENAMES;
+
+	if (opts->flags & GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED)
+		opts->flags |= GIT_DIFF_FIND_COPIES;
+
+#define USE_DEFAULT(X) ((X) == 0 || (X) > 100)
+
+	if (USE_DEFAULT(opts->rename_threshold))
+		opts->rename_threshold = DEFAULT_THRESHOLD;
+
+	if (USE_DEFAULT(opts->rename_from_rewrite_threshold))
+		opts->rename_from_rewrite_threshold = DEFAULT_THRESHOLD;
+
+	if (USE_DEFAULT(opts->copy_threshold))
+		opts->copy_threshold = DEFAULT_THRESHOLD;
+
+	if (USE_DEFAULT(opts->break_rewrite_threshold))
+		opts->break_rewrite_threshold = DEFAULT_BREAK_REWRITE_THRESHOLD;
+
+#undef USE_DEFAULT
+
+	if (!opts->target_limit) {
+		int32_t limit = 0;
+
+		opts->target_limit = DEFAULT_TARGET_LIMIT;
+
+		if (git_config_get_int32(&limit, cfg, "diff.renameLimit") < 0)
+			giterr_clear();
+		else if (limit > 0)
+			opts->target_limit = limit;
+	}
+
+	return 0;
+}
+
+static int apply_splits_and_deletes(git_diff_list *diff, size_t expected_size)
+{
+	git_vector onto = GIT_VECTOR_INIT;
+	size_t i;
+	git_diff_delta *delta;
+
+	if (git_vector_init(&onto, expected_size, git_diff_delta__cmp) < 0)
+		return -1;
+
+	/* build new delta list without TO_DELETE and splitting TO_SPLIT */
+	git_vector_foreach(&diff->deltas, i, delta) {
+		if (delta->status == GIT_DELTA__TO_DELETE) {
+			git__free(delta);
+			continue;
+		}
+
+		if (delta->status == GIT_DELTA__TO_SPLIT) {
+			git_diff_delta *deleted = diff_delta__dup(delta, &diff->pool);
+			if (!deleted)
+				return -1;
+
+			deleted->status = GIT_DELTA_DELETED;
+			memset(&deleted->new_file, 0, sizeof(deleted->new_file));
+			deleted->new_file.path = deleted->old_file.path;
+			deleted->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
+
+			git_vector_insert(&onto, deleted);
+
+			delta->status = GIT_DELTA_ADDED;
+			memset(&delta->old_file, 0, sizeof(delta->old_file));
+			delta->old_file.path = delta->new_file.path;
+			delta->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
+		}
+
+		git_vector_insert(&onto, delta);
+	}
+
+	/* swap new delta list into place */
+	git_vector_sort(&onto);
+	git_vector_swap(&diff->deltas, &onto);
+	git_vector_free(&onto);
+
+	return 0;
+}
+
+static unsigned int calc_similarity(
+	void *cache, git_diff_file *old_file, git_diff_file *new_file)
+{
+	GIT_UNUSED(cache);
+
+	if (git_oid_cmp(&old_file->oid, &new_file->oid) == 0)
+		return 100;
+
+	/* TODO: insert actual similarity algo here */
+
+	return 0;
+}
+
+#define FLAG_SET(opts,flag_name) ((opts.flags & flag_name) != 0)
+
+int git_diff_find_similar(
+	git_diff_list *diff,
+	git_diff_find_options *given_opts)
+{
+	unsigned int i, j, similarity;
+	git_diff_delta *from, *to;
+	git_diff_find_options opts;
+	unsigned int tried_targets, num_changes = 0;
+	git_vector matches = GIT_VECTOR_INIT;
+
+	if (normalize_find_opts(diff, &opts, given_opts) < 0)
+		return -1;
+
+	/* first do splits if requested */
+
+	if (FLAG_SET(opts, GIT_DIFF_FIND_AND_BREAK_REWRITES)) {
+		git_vector_foreach(&diff->deltas, i, from) {
+			if (from->status != GIT_DELTA_MODIFIED)
+				continue;
+
+			/* Right now, this doesn't work right because the similarity
+			 * algorithm isn't actually implemented...
+			 */
+			similarity = 100;
+			/* calc_similarity(NULL, &from->old_file, from->new_file); */
+
+			if (similarity < opts.break_rewrite_threshold) {
+				from->status = GIT_DELTA__TO_SPLIT;
+				num_changes++;
+			}
+		}
+
+		/* apply splits as needed */
+		if (num_changes > 0 &&
+			apply_splits_and_deletes(
+				diff, diff->deltas.length + num_changes) < 0)
+			return -1;
+	}
+
+	/* next find the most similar delta for each rename / copy candidate */
+
+	if (git_vector_init(&matches, diff->deltas.length, git_diff_delta__cmp) < 0)
+		return -1;
+
+	git_vector_foreach(&diff->deltas, i, from) {
+		tried_targets = 0;
+
+		git_vector_foreach(&diff->deltas, j, to) {
+			if (i == j)
+				continue;
+
+			switch (to->status) {
+			case GIT_DELTA_ADDED:
+			case GIT_DELTA_UNTRACKED:
+			case GIT_DELTA_RENAMED:
+			case GIT_DELTA_COPIED:
+				break;
+			default:
+				/* only the above status values should be checked */
+				continue;
+			}
+
+			/* skip all but DELETED files unless copy detection is on */
+			if (from->status != GIT_DELTA_DELETED &&
+				!FLAG_SET(opts, GIT_DIFF_FIND_COPIES))
+				continue;
+
+			/* don't check UNMODIFIED files as source unless given option */
+			if (from->status == GIT_DELTA_UNMODIFIED &&
+				!FLAG_SET(opts, GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED))
+				continue;
+
+			/* cap on maximum files we'll examine */
+			if (++tried_targets > opts.target_limit)
+				break;
+
+			/* calculate similarity and see if this pair beats the
+			 * similarity score of the current best pair.
+			 */
+			similarity = calc_similarity(NULL, &from->old_file, &to->new_file);
+
+			if (to->similarity < similarity) {
+				to->similarity = similarity;
+				if (git_vector_set(NULL, &matches, j, from) < 0)
+					return -1;
+			}
+		}
+	}
+
+	/* next rewrite the diffs with renames / copies */
+
+	num_changes = 0;
+
+	git_vector_foreach(&diff->deltas, j, to) {
+		from = GIT_VECTOR_GET(&matches, j);
+		if (!from) {
+			assert(to->similarity == 0);
+			continue;
+		}
+
+		/* three possible outcomes here:
+		 * 1. old DELETED and if over rename threshold,
+		 *    new becomes RENAMED and old goes away
+		 * 2. old was MODIFIED but FIND_RENAMES_FROM_REWRITES is on and
+		 *    old is more similar to new than it is to itself, in which
+		 *    case, new becomes RENAMED and old becomed ADDED
+		 * 3. otherwise if over copy threshold, new becomes COPIED
+		 */
+
+		if (from->status == GIT_DELTA_DELETED) {
+			if (to->similarity < opts.rename_threshold) {
+				to->similarity = 0;
+				continue;
+			}
+
+			to->status = GIT_DELTA_RENAMED;
+			memcpy(&to->old_file, &from->old_file, sizeof(to->old_file));
+
+			from->status = GIT_DELTA__TO_DELETE;
+			num_changes++;
+
+			continue;
+		}
+
+		if (from->status == GIT_DELTA_MODIFIED &&
+			FLAG_SET(opts, GIT_DIFF_FIND_RENAMES_FROM_REWRITES) &&
+			to->similarity > opts.rename_threshold)
+		{
+			similarity = 100;
+			/* calc_similarity(NULL, &from->old_file, from->new_file); */
+
+			if (similarity < opts.rename_from_rewrite_threshold) {
+				to->status = GIT_DELTA_RENAMED;
+				memcpy(&to->old_file, &from->old_file, sizeof(to->old_file));
+
+				from->status = GIT_DELTA_ADDED;
+				memset(&from->old_file, 0, sizeof(from->old_file));
+				from->old_file.path = to->old_file.path;
+				from->old_file.flags |= GIT_DIFF_FILE_VALID_OID;
+
+				continue;
+			}
+		}
+
+		if (to->similarity < opts.copy_threshold) {
+			to->similarity = 0;
+			continue;
+		}
+
+		/* convert "to" to a COPIED record */
+		to->status = GIT_DELTA_COPIED;
+		memcpy(&to->old_file, &from->old_file, sizeof(to->old_file));
+	}
+
+	git_vector_free(&matches);
+
+	if (num_changes > 0) {
+		assert(num_changes < diff->deltas.length);
+
+		if (apply_splits_and_deletes(
+				diff, diff->deltas.length - num_changes) < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+#undef FLAG_SET
diff --git a/src/vector.c b/src/vector.c
index d9c4c9900..4763792f5 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -255,3 +255,33 @@ void git_vector_swap(git_vector *a, git_vector *b)
 	memcpy(a, b, sizeof(t));
 	memcpy(b, &t, sizeof(t));
 }
+
+int git_vector_resize_to(git_vector *v, size_t new_length)
+{
+	if (new_length <= v->length)
+		return 0;
+
+	while (new_length >= v->_alloc_size)
+		if (resize_vector(v) < 0)
+			return -1;
+
+	memset(&v->contents[v->length], 0,
+		sizeof(void *) * (new_length - v->length));
+
+	v->length = new_length;
+
+	return 0;
+}
+
+int git_vector_set(void **old, git_vector *v, size_t position, void *value)
+{
+	if (git_vector_resize_to(v, position + 1) < 0)
+		return -1;
+
+	if (old != NULL)
+		*old = v->contents[position];
+
+	v->contents[position] = value;
+
+	return 0;
+}
diff --git a/src/vector.h b/src/vector.h
index 32f790c71..5061f7846 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -77,4 +77,7 @@ void git_vector_pop(git_vector *v);
 void git_vector_uniq(git_vector *v);
 void git_vector_remove_matching(git_vector *v, int (*match)(git_vector *v, size_t idx));
 
+int git_vector_resize_to(git_vector *v, size_t new_length);
+int git_vector_set(void **old, git_vector *v, size_t position, void *value);
+
 #endif
diff --git a/tests-clar/diff/blob.c b/tests-clar/diff/blob.c
index d5cf41e99..0a37e829d 100644
--- a/tests-clar/diff/blob.c
+++ b/tests-clar/diff/blob.c
@@ -59,8 +59,8 @@ void test_diff_blob__can_compare_text_blobs(void)
 		a, b, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_mods);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(1, expected.hunks);
 	cl_assert_equal_i(6, expected.lines);
@@ -74,8 +74,8 @@ void test_diff_blob__can_compare_text_blobs(void)
 		b, c, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_mods);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(1, expected.hunks);
 	cl_assert_equal_i(15, expected.lines);
@@ -89,8 +89,8 @@ void test_diff_blob__can_compare_text_blobs(void)
 		a, c, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_mods);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(1, expected.hunks);
 	cl_assert_equal_i(13, expected.lines);
@@ -103,8 +103,8 @@ void test_diff_blob__can_compare_text_blobs(void)
 		c, d, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_mods);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(2, expected.hunks);
 	cl_assert_equal_i(14, expected.lines);
@@ -125,8 +125,8 @@ void test_diff_blob__can_compare_against_null_blobs(void)
 		d, e, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_dels);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(1, expected.hunks);
 	cl_assert_equal_i(14, expected.hunk_old_lines);
@@ -140,8 +140,8 @@ void test_diff_blob__can_compare_against_null_blobs(void)
 		d, e, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_adds);
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(0, expected.files_binary);
 
 	cl_assert_equal_i(1, expected.hunks);
 	cl_assert_equal_i(14, expected.hunk_new_lines);
@@ -154,10 +154,9 @@ void test_diff_blob__can_compare_against_null_blobs(void)
 	cl_git_pass(git_diff_blobs(
 		alien, NULL, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	cl_assert(expected.at_least_one_of_them_is_binary == true);
-
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_dels);
+	cl_assert_equal_i(1, expected.files_binary);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_DELETED]);
 	cl_assert_equal_i(0, expected.hunks);
 	cl_assert_equal_i(0, expected.lines);
 
@@ -166,20 +165,19 @@ void test_diff_blob__can_compare_against_null_blobs(void)
 	cl_git_pass(git_diff_blobs(
 		NULL, alien, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	cl_assert(expected.at_least_one_of_them_is_binary == true);
-
 	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_adds);
+	cl_assert_equal_i(1, expected.files_binary);
+	cl_assert_equal_i(1, expected.file_status[GIT_DELTA_ADDED]);
 	cl_assert_equal_i(0, expected.hunks);
 	cl_assert_equal_i(0, expected.lines);
 }
 
-static void assert_identical_blobs_comparison(diff_expects expected)
+static void assert_identical_blobs_comparison(diff_expects *expected)
 {
-	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_unmodified);
-	cl_assert_equal_i(0, expected.hunks);
-	cl_assert_equal_i(0, expected.lines);
+	cl_assert_equal_i(1, expected->files);
+	cl_assert_equal_i(1, expected->file_status[GIT_DELTA_UNMODIFIED]);
+	cl_assert_equal_i(0, expected->hunks);
+	cl_assert_equal_i(0, expected->lines);
 }
 
 void test_diff_blob__can_compare_identical_blobs(void)
@@ -187,32 +185,32 @@ void test_diff_blob__can_compare_identical_blobs(void)
 	cl_git_pass(git_diff_blobs(
 		d, d, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
-	assert_identical_blobs_comparison(expected);
+	cl_assert_equal_i(0, expected.files_binary);
+	assert_identical_blobs_comparison(&expected);
 
 	memset(&expected, 0, sizeof(expected));
 	cl_git_pass(git_diff_blobs(
 		NULL, NULL, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	cl_assert(expected.at_least_one_of_them_is_binary == false);
-	assert_identical_blobs_comparison(expected);
+	cl_assert_equal_i(0, expected.files_binary);
+	assert_identical_blobs_comparison(&expected);
 
 	memset(&expected, 0, sizeof(expected));
 	cl_git_pass(git_diff_blobs(
 		alien, alien, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	cl_assert(expected.at_least_one_of_them_is_binary == true);
-	assert_identical_blobs_comparison(expected);
+	cl_assert(expected.files_binary > 0);
+	assert_identical_blobs_comparison(&expected);
 }
 
-static void assert_binary_blobs_comparison(diff_expects expected)
+static void assert_binary_blobs_comparison(diff_expects *expected)
 {
-	cl_assert(expected.at_least_one_of_them_is_binary == true);
+	cl_assert(expected->files_binary > 0);
 
-	cl_assert_equal_i(1, expected.files);
-	cl_assert_equal_i(1, expected.file_mods);
-	cl_assert_equal_i(0, expected.hunks);
-	cl_assert_equal_i(0, expected.lines);
+	cl_assert_equal_i(1, expected->files);
+	cl_assert_equal_i(1, expected->file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, expected->hunks);
+	cl_assert_equal_i(0, expected->lines);
 }
 
 void test_diff_blob__can_compare_two_binary_blobs(void)
@@ -227,14 +225,14 @@ void test_diff_blob__can_compare_two_binary_blobs(void)
 	cl_git_pass(git_diff_blobs(
 		alien, heart, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	assert_binary_blobs_comparison(expected);
+	assert_binary_blobs_comparison(&expected);
 
 	memset(&expected, 0, sizeof(expected));
 
 	cl_git_pass(git_diff_blobs(
 		heart, alien, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	assert_binary_blobs_comparison(expected);
+	assert_binary_blobs_comparison(&expected);
 
 	git_blob_free(heart);
 }
@@ -244,14 +242,14 @@ void test_diff_blob__can_compare_a_binary_blob_and_a_text_blob(void)
 	cl_git_pass(git_diff_blobs(
 		alien, d, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	assert_binary_blobs_comparison(expected);
+	assert_binary_blobs_comparison(&expected);
 
 	memset(&expected, 0, sizeof(expected));
 
 	cl_git_pass(git_diff_blobs(
 		d, alien, &opts, &expected, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
-	assert_binary_blobs_comparison(expected);
+	assert_binary_blobs_comparison(&expected);
 }
 
 /*
diff --git a/tests-clar/diff/diff_helpers.c b/tests-clar/diff/diff_helpers.c
index de0e7e074..992c87d4c 100644
--- a/tests-clar/diff/diff_helpers.c
+++ b/tests-clar/diff/diff_helpers.c
@@ -32,20 +32,13 @@ int diff_file_fn(
 
 	e->files++;
 
-	if (delta->binary) {
-		e->at_least_one_of_them_is_binary = true;
+	if (delta->binary)
 		e->files_binary++;
-	}
 
-	switch (delta->status) {
-	case GIT_DELTA_ADDED: e->file_adds++; break;
-	case GIT_DELTA_DELETED: e->file_dels++; break;
-	case GIT_DELTA_MODIFIED: e->file_mods++; break;
-	case GIT_DELTA_IGNORED: e->file_ignored++; break;
-	case GIT_DELTA_UNTRACKED: e->file_untracked++; break;
-	case GIT_DELTA_UNMODIFIED: e->file_unmodified++; break;
-	default: break;
-	}
+	cl_assert(delta->status <= GIT_DELTA_TYPECHANGE);
+
+	e->file_status[delta->status] += 1;
+
 	return 0;
 }
 
diff --git a/tests-clar/diff/diff_helpers.h b/tests-clar/diff/diff_helpers.h
index 629130934..6ff493d49 100644
--- a/tests-clar/diff/diff_helpers.h
+++ b/tests-clar/diff/diff_helpers.h
@@ -8,12 +8,7 @@ typedef struct {
 	int files;
 	int files_binary;
 
-	int file_adds;
-	int file_dels;
-	int file_mods;
-	int file_ignored;
-	int file_untracked;
-	int file_unmodified;
+	int file_status[10]; /* indexed by git_delta_t value */
 
 	int hunks;
 	int hunk_new_lines;
@@ -23,8 +18,6 @@ typedef struct {
 	int line_ctxt;
 	int line_adds;
 	int line_dels;
-
-	bool at_least_one_of_them_is_binary;
 } diff_expects;
 
 extern int diff_file_fn(
diff --git a/tests-clar/diff/index.c b/tests-clar/diff/index.c
index 7c4bddb90..eda8f066a 100644
--- a/tests-clar/diff/index.c
+++ b/tests-clar/diff/index.c
@@ -45,9 +45,9 @@ void test_diff_index__0(void)
 	 * - mv .git .gitted
 	 */
 	cl_assert_equal_i(8, exp.files);
-	cl_assert_equal_i(3, exp.file_adds);
-	cl_assert_equal_i(2, exp.file_dels);
-	cl_assert_equal_i(3, exp.file_mods);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(8, exp.hunks);
 
@@ -73,9 +73,9 @@ void test_diff_index__0(void)
 	 * - mv .git .gitted
 	 */
 	cl_assert_equal_i(12, exp.files);
-	cl_assert_equal_i(7, exp.file_adds);
-	cl_assert_equal_i(2, exp.file_dels);
-	cl_assert_equal_i(3, exp.file_mods);
+	cl_assert_equal_i(7, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(12, exp.hunks);
 
diff --git a/tests-clar/diff/rename.c b/tests-clar/diff/rename.c
new file mode 100644
index 000000000..0ee1db842
--- /dev/null
+++ b/tests-clar/diff/rename.c
@@ -0,0 +1,105 @@
+#include "clar_libgit2.h"
+#include "diff_helpers.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)
+ *
+ * TODO: add commits with various % changes of copy / rename
+ */
+
+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 = {0};
+	git_diff_find_options opts;
+	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...
+	 */
+	memset(&diffopts, 0, sizeof(diffopts));
+	diffopts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
+
+	cl_git_pass(git_diff_tree_to_tree(
+		g_repo, &diffopts, old_tree, new_tree, &diff));
+
+	/* git diff --no-renames \
+	 *          31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 \
+	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a
+	 */
+	memset(&exp, 0, sizeof(exp));
+	cl_git_pass(git_diff_foreach(
+		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	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
+	 */
+	cl_git_pass(git_diff_find_similar(diff, NULL));
+
+	memset(&exp, 0, sizeof(exp));
+	cl_git_pass(git_diff_foreach(
+		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	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(
+		g_repo, &diffopts, old_tree, new_tree, &diff));
+
+	/* git diff --find-copies-harder \
+	 *          31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 \
+	 *          2bc7f351d20b53f1c72c16c4b036e491c478c49a
+	 */
+	memset(&opts, 0, sizeof(opts));
+	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, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
+
+	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);
+}
diff --git a/tests-clar/diff/tree.c b/tests-clar/diff/tree.c
index c5a0e626e..f8b9a71a5 100644
--- a/tests-clar/diff/tree.c
+++ b/tests-clar/diff/tree.c
@@ -40,9 +40,9 @@ void test_diff_tree__0(void)
 		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(5, exp.files);
-	cl_assert_equal_i(2, exp.file_adds);
-	cl_assert_equal_i(1, exp.file_dels);
-	cl_assert_equal_i(2, exp.file_mods);
+	cl_assert_equal_i(2, 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_MODIFIED]);
 
 	cl_assert_equal_i(5, exp.hunks);
 
@@ -62,9 +62,9 @@ void test_diff_tree__0(void)
 		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(2, exp.files);
-	cl_assert_equal_i(0, exp.file_adds);
-	cl_assert_equal_i(0, exp.file_dels);
-	cl_assert_equal_i(2, exp.file_mods);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(2, exp.hunks);
 
@@ -111,22 +111,23 @@ void test_diff_tree__options(void)
 	 * - git diff [options] 6bab5c79cd5140d0 605812ab7fe421fdd
 	 * - mv .git .gitted
 	 */
+#define EXPECT_STATUS_ADM(ADDS,DELS,MODS) { 0, ADDS, DELS, MODS, 0, 0, 0, 0, 0 }
 	diff_expects test_expects[] = {
 		/* a vs b tests */
-		{ 5, 0, 3, 0, 2, 0, 0, 0, 4, 0, 0, 51, 2, 46, 3 },
-		{ 5, 0, 3, 0, 2, 0, 0, 0, 4, 0, 0, 53, 4, 46, 3 },
-		{ 5, 0, 0, 3, 2, 0, 0, 0, 4, 0, 0, 52, 3, 3, 46 },
-		{ 5, 0, 3, 0, 2, 0, 0, 0, 5, 0, 0, 54, 3, 47, 4 },
+		{ 5, 0, EXPECT_STATUS_ADM(3, 0, 2), 4, 0, 0, 51, 2, 46, 3 },
+		{ 5, 0, EXPECT_STATUS_ADM(3, 0, 2), 4, 0, 0, 53, 4, 46, 3 },
+		{ 5, 0, EXPECT_STATUS_ADM(0, 3, 2), 4, 0, 0, 52, 3, 3, 46 },
+		{ 5, 0, EXPECT_STATUS_ADM(3, 0, 2), 5, 0, 0, 54, 3, 47, 4 },
 		/* c vs d tests */
-		{ 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 22, 9, 10, 3 },
-		{ 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 19, 12, 7, 0 },
-		{ 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 20, 11, 8, 1 },
-		{ 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 20, 11, 8, 1 },
-		{ 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 18, 11, 0, 7 },
+		{ 1, 0, EXPECT_STATUS_ADM(0, 0, 1), 1, 0, 0, 22, 9, 10, 3 },
+		{ 1, 0, EXPECT_STATUS_ADM(0, 0, 1), 1, 0, 0, 19, 12, 7, 0 },
+		{ 1, 0, EXPECT_STATUS_ADM(0, 0, 1), 1, 0, 0, 20, 11, 8, 1 },
+		{ 1, 0, EXPECT_STATUS_ADM(0, 0, 1), 1, 0, 0, 20, 11, 8, 1 },
+		{ 1, 0, EXPECT_STATUS_ADM(0, 0, 1), 1, 0, 0, 18, 11, 0, 7 },
 		{ 0 },
 	};
 	diff_expects *expected;
-	int i;
+	int i, j;
 
 	g_repo = cl_git_sandbox_init("attr");
 
@@ -149,9 +150,8 @@ void test_diff_tree__options(void)
 
 		expected = &test_expects[i];
 		cl_assert_equal_i(actual.files,     expected->files);
-		cl_assert_equal_i(actual.file_adds, expected->file_adds);
- 		cl_assert_equal_i(actual.file_dels, expected->file_dels);
-		cl_assert_equal_i(actual.file_mods, expected->file_mods);
+		for (j = GIT_DELTA_UNMODIFIED; j <= GIT_DELTA_TYPECHANGE; ++j)
+			cl_assert_equal_i(expected->file_status[j], actual.file_status[j]);
 		cl_assert_equal_i(actual.hunks,     expected->hunks);
 		cl_assert_equal_i(actual.lines,     expected->lines);
 		cl_assert_equal_i(actual.line_ctxt, expected->line_ctxt);
@@ -193,9 +193,9 @@ void test_diff_tree__bare(void)
 		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(3, exp.files);
-	cl_assert_equal_i(2, exp.file_adds);
-	cl_assert_equal_i(0, exp.file_dels);
-	cl_assert_equal_i(1, exp.file_mods);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(3, exp.hunks);
 
@@ -243,9 +243,9 @@ void test_diff_tree__merge(void)
 		diff1, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(6, exp.files);
-	cl_assert_equal_i(2, exp.file_adds);
-	cl_assert_equal_i(1, exp.file_dels);
-	cl_assert_equal_i(3, exp.file_mods);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(6, exp.hunks);
 
diff --git a/tests-clar/diff/workdir.c b/tests-clar/diff/workdir.c
index 3e388ea70..e617560f7 100644
--- a/tests-clar/diff/workdir.c
+++ b/tests-clar/diff/workdir.c
@@ -46,11 +46,11 @@ void test_diff_workdir__to_index(void)
 		 * - mv .git .gitted
 		 */
 		cl_assert_equal_i(13, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(4, exp.file_dels);
-		cl_assert_equal_i(4, exp.file_mods);
-		cl_assert_equal_i(1, exp.file_ignored);
-		cl_assert_equal_i(4, exp.file_untracked);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_UNTRACKED]);
 
 		cl_assert_equal_i(8, exp.hunks);
 
@@ -107,11 +107,11 @@ void test_diff_workdir__to_tree(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(14, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(4, exp.file_dels);
-		cl_assert_equal_i(4, exp.file_mods);
-		cl_assert_equal_i(1, exp.file_ignored);
-		cl_assert_equal_i(5, exp.file_untracked);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(5, exp.file_status[GIT_DELTA_UNTRACKED]);
 	}
 
 	/* Since there is no git diff equivalent, let's just assume that the
@@ -143,11 +143,11 @@ void test_diff_workdir__to_tree(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(15, exp.files);
-		cl_assert_equal_i(2, exp.file_adds);
-		cl_assert_equal_i(5, exp.file_dels);
-		cl_assert_equal_i(4, exp.file_mods);
-		cl_assert_equal_i(1, exp.file_ignored);
-		cl_assert_equal_i(3, exp.file_untracked);
+		cl_assert_equal_i(2, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(5, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(3, exp.file_status[GIT_DELTA_UNTRACKED]);
 
 		cl_assert_equal_i(11, exp.hunks);
 
@@ -180,11 +180,11 @@ void test_diff_workdir__to_tree(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(16, exp.files);
-		cl_assert_equal_i(5, exp.file_adds);
-		cl_assert_equal_i(4, exp.file_dels);
-		cl_assert_equal_i(3, exp.file_mods);
-		cl_assert_equal_i(1, exp.file_ignored);
-		cl_assert_equal_i(3, exp.file_untracked);
+		cl_assert_equal_i(5, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(3, exp.file_status[GIT_DELTA_UNTRACKED]);
 
 		cl_assert_equal_i(12, exp.hunks);
 
@@ -228,11 +228,11 @@ void test_diff_workdir__to_index_with_pathspec(void)
 			cl_git_pass(git_diff_foreach(diff, &exp, diff_file_fn, NULL, NULL));
 
 		cl_assert_equal_i(13, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(4, exp.file_dels);
-		cl_assert_equal_i(4, exp.file_mods);
-		cl_assert_equal_i(1, exp.file_ignored);
-		cl_assert_equal_i(4, exp.file_untracked);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(4, exp.file_status[GIT_DELTA_UNTRACKED]);
 	}
 
 	git_diff_list_free(diff);
@@ -251,11 +251,11 @@ void test_diff_workdir__to_index_with_pathspec(void)
 			cl_git_pass(git_diff_foreach(diff, &exp, diff_file_fn, NULL, NULL));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
-		cl_assert_equal_i(0, exp.file_ignored);
-		cl_assert_equal_i(0, exp.file_untracked);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_UNTRACKED]);
 	}
 
 	git_diff_list_free(diff);
@@ -274,11 +274,11 @@ void test_diff_workdir__to_index_with_pathspec(void)
 			cl_git_pass(git_diff_foreach(diff, &exp, diff_file_fn, NULL, NULL));
 
 		cl_assert_equal_i(3, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(1, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
-		cl_assert_equal_i(0, exp.file_ignored);
-		cl_assert_equal_i(1, exp.file_untracked);
+		cl_assert_equal_i(0, 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_MODIFIED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_UNTRACKED]);
 	}
 
 	git_diff_list_free(diff);
@@ -297,11 +297,11 @@ void test_diff_workdir__to_index_with_pathspec(void)
 			cl_git_pass(git_diff_foreach(diff, &exp, diff_file_fn, NULL, NULL));
 
 		cl_assert_equal_i(2, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(2, exp.file_dels);
-		cl_assert_equal_i(0, exp.file_mods);
-		cl_assert_equal_i(0, exp.file_ignored);
-		cl_assert_equal_i(0, exp.file_untracked);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_MODIFIED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_IGNORED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_UNTRACKED]);
 	}
 
 	git_diff_list_free(diff);
@@ -337,7 +337,7 @@ void test_diff_workdir__filemode_changes(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(0, exp.files);
-		cl_assert_equal_i(0, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(0, exp.hunks);
 	}
 
@@ -360,7 +360,7 @@ void test_diff_workdir__filemode_changes(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(0, exp.hunks);
 	}
 
@@ -393,7 +393,7 @@ void test_diff_workdir__filemode_changes_with_filemode_false(void)
 		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(0, exp.files);
-	cl_assert_equal_i(0, exp.file_mods);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_MODIFIED]);
 	cl_assert_equal_i(0, exp.hunks);
 
 	git_diff_list_free(diff);
@@ -409,7 +409,7 @@ void test_diff_workdir__filemode_changes_with_filemode_false(void)
 		diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 	cl_assert_equal_i(0, exp.files);
-	cl_assert_equal_i(0, exp.file_mods);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_MODIFIED]);
 	cl_assert_equal_i(0, exp.hunks);
 
 	git_diff_list_free(diff);
@@ -456,9 +456,9 @@ void test_diff_workdir__head_index_and_workdir_all_differ(void)
 				diff_i2t, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(1, exp.hunks);
 		cl_assert_equal_i(2, exp.lines);
 		cl_assert_equal_i(1, exp.line_ctxt);
@@ -477,9 +477,9 @@ void test_diff_workdir__head_index_and_workdir_all_differ(void)
 				diff_w2i, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(1, exp.hunks);
 		cl_assert_equal_i(3, exp.lines);
 		cl_assert_equal_i(2, exp.line_ctxt);
@@ -500,9 +500,9 @@ void test_diff_workdir__head_index_and_workdir_all_differ(void)
 				diff_i2t, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(1, exp.hunks);
 		cl_assert_equal_i(3, exp.lines);
 		cl_assert_equal_i(1, exp.line_ctxt);
@@ -542,9 +542,9 @@ void test_diff_workdir__eof_newline_changes(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(0, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(0, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(0, exp.hunks);
 		cl_assert_equal_i(0, exp.lines);
 		cl_assert_equal_i(0, exp.line_ctxt);
@@ -569,9 +569,9 @@ void test_diff_workdir__eof_newline_changes(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(1, exp.hunks);
 		cl_assert_equal_i(2, exp.lines);
 		cl_assert_equal_i(1, exp.line_ctxt);
@@ -596,9 +596,9 @@ void test_diff_workdir__eof_newline_changes(void)
 				diff, &exp, diff_file_fn, diff_hunk_fn, diff_line_fn));
 
 		cl_assert_equal_i(1, exp.files);
-		cl_assert_equal_i(0, exp.file_adds);
-		cl_assert_equal_i(0, exp.file_dels);
-		cl_assert_equal_i(1, exp.file_mods);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+		cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+		cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
 		cl_assert_equal_i(1, exp.hunks);
 		cl_assert_equal_i(3, exp.lines);
 		cl_assert_equal_i(0, exp.line_ctxt);
@@ -801,11 +801,11 @@ void test_diff_workdir__submodules(void)
 
 	cl_assert_equal_i(10, exp.files);
 
-	cl_assert_equal_i(0, exp.file_adds);
-	cl_assert_equal_i(0, exp.file_dels);
-	cl_assert_equal_i(1, exp.file_mods);
-	cl_assert_equal_i(0, exp.file_ignored);
-	cl_assert_equal_i(9, exp.file_untracked);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(1, exp.file_status[GIT_DELTA_MODIFIED]);
+	cl_assert_equal_i(0, exp.file_status[GIT_DELTA_IGNORED]);
+	cl_assert_equal_i(9, exp.file_status[GIT_DELTA_UNTRACKED]);
 
 	/* the following numbers match "git diff 873585" exactly */
 
diff --git a/tests-clar/resources/renames/.gitted/HEAD b/tests-clar/resources/renames/.gitted/HEAD
new file mode 100644
index 000000000..cb089cd89
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/master
diff --git a/tests-clar/resources/renames/.gitted/config b/tests-clar/resources/renames/.gitted/config
new file mode 100644
index 000000000..bb4d11c1f
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/config
@@ -0,0 +1,7 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+	ignorecase = true
+	precomposeunicode = false
diff --git a/tests-clar/resources/renames/.gitted/description b/tests-clar/resources/renames/.gitted/description
new file mode 100644
index 000000000..498b267a8
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/description
@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.
diff --git a/tests-clar/resources/renames/.gitted/index b/tests-clar/resources/renames/.gitted/index
new file mode 100644
index 000000000..1fc69fcbe
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/index
diff --git a/tests-clar/resources/renames/.gitted/info/exclude b/tests-clar/resources/renames/.gitted/info/exclude
new file mode 100644
index 000000000..a5196d1be
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/info/exclude
@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~
diff --git a/tests-clar/resources/renames/.gitted/logs/HEAD b/tests-clar/resources/renames/.gitted/logs/HEAD
new file mode 100644
index 000000000..34222ed7d
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/logs/HEAD
@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 Russell Belfer <rb@github.com> 1351024687 -0700	commit (initial): Initial commit
+31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 2bc7f351d20b53f1c72c16c4b036e491c478c49a Russell Belfer <rb@github.com> 1351024817 -0700	commit: copy and rename with no change
diff --git a/tests-clar/resources/renames/.gitted/logs/refs/heads/master b/tests-clar/resources/renames/.gitted/logs/refs/heads/master
new file mode 100644
index 000000000..34222ed7d
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/logs/refs/heads/master
@@ -0,0 +1,2 @@
+0000000000000000000000000000000000000000 31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 Russell Belfer <rb@github.com> 1351024687 -0700	commit (initial): Initial commit
+31e47d8c1fa36d7f8d537b96158e3f024de0a9f2 2bc7f351d20b53f1c72c16c4b036e491c478c49a Russell Belfer <rb@github.com> 1351024817 -0700	commit: copy and rename with no change
diff --git a/tests-clar/resources/renames/.gitted/objects/03/da7ad872536bd448da8d88eb7165338bf923a7 b/tests-clar/resources/renames/.gitted/objects/03/da7ad872536bd448da8d88eb7165338bf923a7
new file mode 100644
index 000000000..2ee86444d
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/03/da7ad872536bd448da8d88eb7165338bf923a7
diff --git a/tests-clar/resources/renames/.gitted/objects/2b/c7f351d20b53f1c72c16c4b036e491c478c49a b/tests-clar/resources/renames/.gitted/objects/2b/c7f351d20b53f1c72c16c4b036e491c478c49a
new file mode 100644
index 000000000..93f1ccb3f
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/2b/c7f351d20b53f1c72c16c4b036e491c478c49a
diff --git a/tests-clar/resources/renames/.gitted/objects/31/e47d8c1fa36d7f8d537b96158e3f024de0a9f2 b/tests-clar/resources/renames/.gitted/objects/31/e47d8c1fa36d7f8d537b96158e3f024de0a9f2
new file mode 100644
index 000000000..00ce53212
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/31/e47d8c1fa36d7f8d537b96158e3f024de0a9f2
diff --git a/tests-clar/resources/renames/.gitted/objects/61/8c6f2f8740bd6049b2fb9eb93fc15726462745 b/tests-clar/resources/renames/.gitted/objects/61/8c6f2f8740bd6049b2fb9eb93fc15726462745
new file mode 100644
index 000000000..24eac54c5
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/61/8c6f2f8740bd6049b2fb9eb93fc15726462745
diff --git a/tests-clar/resources/renames/.gitted/objects/66/311f5cfbe7836c27510a3ba2f43e282e2c8bba b/tests-clar/resources/renames/.gitted/objects/66/311f5cfbe7836c27510a3ba2f43e282e2c8bba
new file mode 100644
index 000000000..5ee28a76a
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/66/311f5cfbe7836c27510a3ba2f43e282e2c8bba
diff --git a/tests-clar/resources/renames/.gitted/objects/ad/0a8e55a104ac54a8a29ed4b84b49e76837a113 b/tests-clar/resources/renames/.gitted/objects/ad/0a8e55a104ac54a8a29ed4b84b49e76837a113
new file mode 100644
index 000000000..440b7bec3
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/objects/ad/0a8e55a104ac54a8a29ed4b84b49e76837a113
diff --git a/tests-clar/resources/renames/.gitted/refs/heads/master b/tests-clar/resources/renames/.gitted/refs/heads/master
new file mode 100644
index 000000000..049b1f5ad
--- /dev/null
+++ b/tests-clar/resources/renames/.gitted/refs/heads/master
@@ -0,0 +1 @@
+2bc7f351d20b53f1c72c16c4b036e491c478c49a
diff --git a/tests-clar/resources/renames/sevencities.txt b/tests-clar/resources/renames/sevencities.txt
new file mode 100644
index 000000000..66311f5cf
--- /dev/null
+++ b/tests-clar/resources/renames/sevencities.txt
@@ -0,0 +1,49 @@
+The Song of Seven Cities
+========================
+
+I WAS Lord of Cities very sumptuously builded.
+Seven roaring Cities paid me tribute from afar.
+Ivory their outposts were—the guardrooms of them gilded,
+And garrisoned with Amazons invincible in war.
+
+All the world went softly when it walked before my Cities—
+Neither King nor Army vexed my peoples at their toil,
+Never horse nor chariot irked or overbore my Cities,
+Never Mob nor Ruler questioned whence they drew their spoil.
+
+Banded, mailed and arrogant from sunrise unto sunset;
+Singing while they sacked it, they possessed the land at large.
+Yet when men would rob them, they resisted, they made onset
+And pierced the smoke of battle with a thousand-sabred charge.
+
+So they warred and trafficked only yesterday, my Cities.
+To-day there is no mark or mound of where my Cities stood.
+For the River rose at midnight and it washed away my Cities.
+They are evened with Atlantis and the towns before the Flood.
+
+Rain on rain-gorged channels raised the water-levels round them,
+Freshet backed on freshet swelled and swept their world from sight,
+Till the emboldened floods linked arms and, flashing forward, drowned them—
+Drowned my Seven Cities and their peoples in one night!
+
+Low among the alders lie their derelict foundations,
+The beams wherein they trusted and the plinths whereon they built—
+My rulers and their treasure and their unborn populations,
+Dead, destroyed, aborted, and defiled with mud and silt!
+
+The Daughters of the Palace whom they cherished in my Cities,
+My silver-tongued Princesses, and the promise of their May—
+Their bridegrooms of the June-tide—all have perished in my Cities,
+With the harsh envenomed virgins that can neither love nor play.
+
+I was Lord of Cities—I will build anew my Cities,
+Seven, set on rocks, above the wrath of any flood.
+Nor will I rest from search till I have filled anew my Cities
+With peoples undefeated of the dark, enduring blood.
+
+To the sound of trumpets shall their seed restore my Cities
+Wealthy and well-weaponed, that once more may I behold
+All the world go softly when it walks before my Cities,
+And the horses and the chariots fleeing from them as of old!
+
+                -- Rudyard Kipling
diff --git a/tests-clar/resources/renames/sixserving.txt b/tests-clar/resources/renames/sixserving.txt
new file mode 100644
index 000000000..ad0a8e55a
--- /dev/null
+++ b/tests-clar/resources/renames/sixserving.txt
@@ -0,0 +1,24 @@
+I KEEP six honest serving-men
+ (They taught me all I knew);
+Their names are What and Why and When
+ And How and Where and Who.
+I send them over land and sea,
+ I send them east and west;
+But after they have worked for me,
+ I give them all a rest.
+
+I let them rest from nine till five,
+ For I am busy then,
+As well as breakfast, lunch, and tea,
+ For they are hungry men.
+But different folk have different views;
+I know a person small—
+She keeps ten million serving-men,
+Who get no rest at all!
+
+She sends'em abroad on her own affairs,
+ From the second she opens her eyes—
+One million Hows, two million Wheres,
+And seven million Whys!
+
+                -- Rudyard Kipling
diff --git a/tests-clar/resources/renames/songofseven.txt b/tests-clar/resources/renames/songofseven.txt
new file mode 100644
index 000000000..66311f5cf
--- /dev/null
+++ b/tests-clar/resources/renames/songofseven.txt
@@ -0,0 +1,49 @@
+The Song of Seven Cities
+========================
+
+I WAS Lord of Cities very sumptuously builded.
+Seven roaring Cities paid me tribute from afar.
+Ivory their outposts were—the guardrooms of them gilded,
+And garrisoned with Amazons invincible in war.
+
+All the world went softly when it walked before my Cities—
+Neither King nor Army vexed my peoples at their toil,
+Never horse nor chariot irked or overbore my Cities,
+Never Mob nor Ruler questioned whence they drew their spoil.
+
+Banded, mailed and arrogant from sunrise unto sunset;
+Singing while they sacked it, they possessed the land at large.
+Yet when men would rob them, they resisted, they made onset
+And pierced the smoke of battle with a thousand-sabred charge.
+
+So they warred and trafficked only yesterday, my Cities.
+To-day there is no mark or mound of where my Cities stood.
+For the River rose at midnight and it washed away my Cities.
+They are evened with Atlantis and the towns before the Flood.
+
+Rain on rain-gorged channels raised the water-levels round them,
+Freshet backed on freshet swelled and swept their world from sight,
+Till the emboldened floods linked arms and, flashing forward, drowned them—
+Drowned my Seven Cities and their peoples in one night!
+
+Low among the alders lie their derelict foundations,
+The beams wherein they trusted and the plinths whereon they built—
+My rulers and their treasure and their unborn populations,
+Dead, destroyed, aborted, and defiled with mud and silt!
+
+The Daughters of the Palace whom they cherished in my Cities,
+My silver-tongued Princesses, and the promise of their May—
+Their bridegrooms of the June-tide—all have perished in my Cities,
+With the harsh envenomed virgins that can neither love nor play.
+
+I was Lord of Cities—I will build anew my Cities,
+Seven, set on rocks, above the wrath of any flood.
+Nor will I rest from search till I have filled anew my Cities
+With peoples undefeated of the dark, enduring blood.
+
+To the sound of trumpets shall their seed restore my Cities
+Wealthy and well-weaponed, that once more may I behold
+All the world go softly when it walks before my Cities,
+And the horses and the chariots fleeing from them as of old!
+
+                -- Rudyard Kipling