[PATCH 02/24] cache-tree: wrap the_index based wrappers with #ifdef

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This puts update_main_cache_tree() and write_cache_as_tree() in the
same group of "index compat" functions that assume the_index
implicitly, which should only be used within builtin/ or t/helper.

sequencer.c is also updated to not use these functions. As of now, no
files outside builtin/ use these functions anymore.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 cache-tree.c | 12 ------------
 cache-tree.h | 17 ++++++++++++++---
 sequencer.c  |  4 ++--
 3 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/cache-tree.c b/cache-tree.c
index 181d5919f0..16ea022c46 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -652,11 +652,6 @@ int write_index_as_tree(struct object_id *oid, struct index_state *index_state,
 	return ret;
 }
 
-int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix)
-{
-	return write_index_as_tree(oid, &the_index, get_index_file(), flags, prefix);
-}
-
 static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
 {
 	struct tree_desc desc;
@@ -723,10 +718,3 @@ int cache_tree_matches_traversal(struct cache_tree *root,
 		return it->entry_count;
 	return 0;
 }
-
-int update_main_cache_tree(int flags)
-{
-	if (!the_index.cache_tree)
-		the_index.cache_tree = cache_tree();
-	return cache_tree_update(&the_index, flags);
-}
diff --git a/cache-tree.h b/cache-tree.h
index 9799e894f7..fc0c842e77 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -33,8 +33,6 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
 int cache_tree_fully_valid(struct cache_tree *);
 int cache_tree_update(struct index_state *, int);
 
-int update_main_cache_tree(int);
-
 /* bitmasks to write_cache_as_tree flags */
 #define WRITE_TREE_MISSING_OK 1
 #define WRITE_TREE_IGNORE_CACHE_TREE 2
@@ -48,9 +46,22 @@ int update_main_cache_tree(int);
 #define WRITE_TREE_PREFIX_ERROR (-3)
 
 int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
-int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix);
 void prime_cache_tree(struct index_state *, struct tree *);
 
 int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);
 
+#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
+static inline int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix)
+{
+	return write_index_as_tree(oid, &the_index, get_index_file(), flags, prefix);
+}
+
+static inline int update_main_cache_tree(int flags)
+{
+	if (!the_index.cache_tree)
+		the_index.cache_tree = cache_tree();
+	return cache_tree_update(&the_index, flags);
+}
+#endif
+
 #endif
diff --git a/sequencer.c b/sequencer.c
index 31038472fd..4d40f50c1c 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1244,7 +1244,7 @@ static int try_to_commit(struct strbuf *msg, const char *author,
 		commit_list_insert(current_head, &parents);
 	}
 
-	if (write_cache_as_tree(&tree, 0, NULL)) {
+	if (write_index_as_tree(&tree, &the_index, get_index_file(), 0, NULL)) {
 		res = error(_("git write-tree failed to write a tree"));
 		goto out;
 	}
@@ -1630,7 +1630,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		 * that represents the "current" state for merge-recursive
 		 * to work on.
 		 */
-		if (write_cache_as_tree(&head, 0, NULL))
+		if (write_index_as_tree(&head, &the_index, get_index_file(), 0, NULL))
 			return error(_("your index file is unmerged."));
 	} else {
 		unborn = get_oid("HEAD", &head);
-- 
2.18.0.1004.g6639190530