[PATCH v4 20/34] merge-recursive: add a new hashmap for storing directory renames

[Elijah Newren <newren@gmail.com>]

This just adds dir_rename_entry and the associated functions; code using
these will be added in subsequent commits.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-recursive.c | 35 +++++++++++++++++++++++++++++++++++
 merge-recursive.h |  8 ++++++++
 2 files changed, 43 insertions(+)

diff --git a/merge-recursive.c b/merge-recursive.c
index 4adff2d538..0cb27c66e2 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -49,6 +49,41 @@ static unsigned int path_hash(const char *path)
 	return ignore_case ? strihash(path) : strhash(path);
 }
 
+static struct dir_rename_entry *dir_rename_find_entry(struct hashmap *hashmap,
+						      char *dir)
+{
+	struct dir_rename_entry key;
+
+	if (dir == NULL)
+		return NULL;
+	hashmap_entry_init(&key, strhash(dir));
+	key.dir = dir;
+	return hashmap_get(hashmap, &key, NULL);
+}
+
+static int dir_rename_cmp(void *unused_cmp_data,
+			  const struct dir_rename_entry *e1,
+			  const struct dir_rename_entry *e2,
+			  const void *unused_keydata)
+{
+	return strcmp(e1->dir, e2->dir);
+}
+
+static void dir_rename_init(struct hashmap *map)
+{
+	hashmap_init(map, (hashmap_cmp_fn) dir_rename_cmp, NULL, 0);
+}
+
+static void dir_rename_entry_init(struct dir_rename_entry *entry,
+				  char *directory)
+{
+	hashmap_entry_init(entry, strhash(directory));
+	entry->dir = directory;
+	entry->non_unique_new_dir = 0;
+	strbuf_init(&entry->new_dir, 0);
+	string_list_init(&entry->possible_new_dirs, 0);
+}
+
 static void flush_output(struct merge_options *o)
 {
 	if (o->buffer_output < 2 && o->obuf.len) {
diff --git a/merge-recursive.h b/merge-recursive.h
index 80d69d1401..d7f4cc80c1 100644
--- a/merge-recursive.h
+++ b/merge-recursive.h
@@ -29,6 +29,14 @@ struct merge_options {
 	struct string_list df_conflict_file_set;
 };
 
+struct dir_rename_entry {
+	struct hashmap_entry ent; /* must be the first member! */
+	char *dir;
+	unsigned non_unique_new_dir:1;
+	struct strbuf new_dir;
+	struct string_list possible_new_dirs;
+};
+
 /* merge_trees() but with recursive ancestor consolidation */
 int merge_recursive(struct merge_options *o,
 		    struct commit *h1,
-- 
2.15.0.408.g850bc54b15