[RFC/PATCH 2/8] split-index: add {add,remove}_split_index() functions

[Christian Couder <christian.couder@gmail.com>]

Also use the functions in cmd_update_index() in
builtin/update-index.c.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin/update-index.c | 17 ++++-------------
 split-index.c          | 18 ++++++++++++++++++
 split-index.h          |  2 ++
 3 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/builtin/update-index.c b/builtin/update-index.c
index 6cdfd5f..f06fe80 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -1108,19 +1108,10 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 		strbuf_release(&buf);
 	}
 
-	if (split_index > 0) {
-		init_split_index(&the_index);
-		the_index.cache_changed |= SPLIT_INDEX_ORDERED;
-	} else if (!split_index && the_index.split_index) {
-		/*
-		 * can't discard_split_index(&the_index); because that
-		 * will destroy split_index->base->cache[], which may
-		 * be shared with the_index.cache[]. So yeah we're
-		 * leaking a bit here.
-		 */
-		the_index.split_index = NULL;
-		the_index.cache_changed |= SOMETHING_CHANGED;
-	}
+	if (split_index > 0)
+		add_split_index(&the_index);
+	else if (!split_index && the_index.split_index)
+		remove_split_index(&the_index);
 
 	switch (untracked_cache) {
 	case UC_UNSPECIFIED:
diff --git a/split-index.c b/split-index.c
index 3c75d4b..9466b69 100644
--- a/split-index.c
+++ b/split-index.c
@@ -319,3 +319,21 @@ void replace_index_entry_in_base(struct index_state *istate,
 		istate->split_index->base->cache[new->index - 1] = new;
 	}
 }
+
+void add_split_index(struct index_state *istate)
+{
+	init_split_index(istate);
+	istate->cache_changed |= SPLIT_INDEX_ORDERED;
+}
+
+void remove_split_index(struct index_state *istate)
+{
+	/*
+	 * can't discard_split_index(&the_index); because that
+	 * will destroy split_index->base->cache[], which may
+	 * be shared with the_index.cache[]. So yeah we're
+	 * leaking a bit here.
+	 */
+	istate->split_index = NULL;
+	istate->cache_changed |= SOMETHING_CHANGED;
+}
diff --git a/split-index.h b/split-index.h
index c1324f5..df91c1b 100644
--- a/split-index.h
+++ b/split-index.h
@@ -31,5 +31,7 @@ void merge_base_index(struct index_state *istate);
 void prepare_to_write_split_index(struct index_state *istate);
 void finish_writing_split_index(struct index_state *istate);
 void discard_split_index(struct index_state *istate);
+void add_split_index(struct index_state *istate);
+void remove_split_index(struct index_state *istate);
 
 #endif
-- 
2.9.0.250.g7087ccc.dirty