This populates a list of directory renames for us. The list of
directory renames is not yet used, but will be in subsequent commits.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
merge-recursive.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 149 insertions(+)
diff --git a/merge-recursive.c b/merge-recursive.c
index 98bc177c4e..68907f7376 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1384,6 +1384,129 @@ static struct diff_queue_struct *get_diffpairs(struct merge_options *o,
return ret;
}
+static void get_renamed_dir_portion(const char *old_path, const char *new_path,
+ char **old_dir, char **new_dir)
+{
+ *old_dir = NULL;
+ *new_dir = NULL;
+
+ /* For
+ * "a/b/c/d/foo.c" -> "a/b/something-else/d/foo.c"
+ * the "d/foo.c" part is the same, we just want to know that
+ * "a/b/c" was renamed to "a/b/something-else"
+ * so, for this example, this function returns "a/b/c" in
+ * *old_dir and "a/b/something-else" in *new_dir.
+ *
+ * Also, if the basename of the file changed, we don't care. We
+ * want to know which portion of the directory, if any, changed.
+ */
+ char *end_of_old = strrchr(old_path, '/');
+ char *end_of_new = strrchr(new_path, '/');
+
+ if (end_of_old == NULL || end_of_new == NULL)
+ return;
+ while (*--end_of_new == *--end_of_old &&
+ end_of_old != old_path &&
+ end_of_new != new_path)
+ ; /* Do nothing; all in the while loop */
+ /*
+ * We've found the first non-matching character in the directory
+ * paths. That means the current directory we were comparing
+ * represents the rename. Move end_of_old and end_of_new back
+ * to the full directory name.
+ */
+ if (*end_of_old == '/')
+ end_of_old++;
+ if (*end_of_old != '/')
+ end_of_new++;
+ end_of_old = strchr(end_of_old, '/');
+ end_of_new = strchr(end_of_new, '/');
+
+ /*
+ * It may have been the case that old_path and new_path were the same
+ * directory all along. Don't claim a rename if they're the same.
+ */
+ int old_len = end_of_old - old_path;
+ int new_len = end_of_new - new_path;
+
+ if (old_len != new_len || strncmp(old_path, new_path, old_len)) {
+ *old_dir = strndup(old_path, old_len);
+ *new_dir = strndup(new_path, new_len);
+ }
+}
+
+static struct hashmap *get_directory_renames(struct diff_queue_struct *pairs,
+ struct tree *tree)
+{
+ struct hashmap *dir_renames;
+ struct hashmap_iter iter;
+ struct dir_rename_entry *entry;
+ int i;
+
+ dir_renames = malloc(sizeof(struct hashmap));
+ dir_rename_init(dir_renames);
+ for (i = 0; i < pairs->nr; ++i) {
+ struct string_list_item *item;
+ int *count;
+ struct diff_filepair *pair = pairs->queue[i];
+ char *old_dir, *new_dir;
+
+ get_renamed_dir_portion(pair->one->path, pair->two->path,
+ &old_dir, &new_dir);
+ if (!old_dir)
+ /* Directory didn't change at all; ignore this one. */
+ continue;
+
+ entry = dir_rename_find_entry(dir_renames, old_dir);
+ if (!entry) {
+ entry = xmalloc(sizeof(struct dir_rename_entry));
+ dir_rename_entry_init(entry, old_dir);
+ hashmap_put(dir_renames, entry);
+ } else {
+ free(old_dir);
+ }
+ item = string_list_lookup(&entry->possible_new_dirs, new_dir);
+ if (!item) {
+ item = string_list_insert(&entry->possible_new_dirs,
+ new_dir);
+ item->util = xcalloc(1, sizeof(int));
+ } else {
+ free(new_dir);
+ }
+ count = item->util;
+ *count += 1;
+ }
+
+ hashmap_iter_init(dir_renames, &iter);
+ while ((entry = hashmap_iter_next(&iter))) {
+ int max = 0;
+ int bad_max = 0;
+ char *best = NULL;
+
+ for (i = 0; i < entry->possible_new_dirs.nr; i++) {
+ int *count = entry->possible_new_dirs.items[i].util;
+
+ if (*count == max)
+ bad_max = max;
+ else if (*count > max) {
+ max = *count;
+ best = entry->possible_new_dirs.items[i].string;
+ }
+ }
+ if (bad_max == max)
+ entry->non_unique_new_dir = 1;
+ else
+ entry->new_dir = strdup(best);
+ /* Strings were strndup'ed before inserting into string-list,
+ * so ask string_list to remove the entries for us.
+ */
+ entry->possible_new_dirs.strdup_strings = 1;
+ string_list_clear(&entry->possible_new_dirs, 1);
+ }
+
+ return dir_renames;
+}
+
/*
* Get information of all renames which occurred in 'pairs', making use of
* any implicit directory renames inferred from the other side of history.
@@ -1703,6 +1826,9 @@ static int handle_renames(struct merge_options *o,
struct rename_info *ri)
{
struct diff_queue_struct *head_pairs, *merge_pairs;
+ struct hashmap *dir_re_head, *dir_re_merge;
+ struct hashmap_iter iter;
+ struct dir_rename_entry *e;
int clean;
if (!o->detect_rename) {
@@ -1714,6 +1840,9 @@ static int handle_renames(struct merge_options *o,
head_pairs = get_diffpairs(o, common, head);
merge_pairs = get_diffpairs(o, common, merge);
+ dir_re_head = get_directory_renames(head_pairs, head);
+ dir_re_merge = get_directory_renames(merge_pairs, merge);
+
ri->head_renames = get_renames(o, head_pairs, head,
common, head, merge, entries);
ri->merge_renames = get_renames(o, merge_pairs, merge,
@@ -1727,6 +1856,26 @@ static int handle_renames(struct merge_options *o,
* process_entry(). But there are a few things we can free now.
*/
+ hashmap_iter_init(dir_re_head, &iter);
+ while ((e = hashmap_iter_next(&iter))) {
+ free(e->dir);
+ if (e->new_dir)
+ free(e->new_dir);
+ /* possible_new_dirs already cleared in get_directory_renames */
+ }
+ hashmap_free(dir_re_head, 1);
+ free(dir_re_head);
+
+ hashmap_iter_init(dir_re_merge, &iter);
+ while ((e = hashmap_iter_next(&iter))) {
+ free(e->dir);
+ if (e->new_dir)
+ free(e->new_dir);
+ /* possible_new_dirs already cleared in get_directory_renames */
+ }
+ hashmap_free(dir_re_merge, 1);
+ free(dir_re_merge);
+
free(head_pairs->queue);
free(head_pairs);
free(merge_pairs->queue);
--
2.15.0.309.g00c152f825
