[PATCH 2/8] move prune_cache() to git lib

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

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin-ls-files.c |   29 +----------------------------
 cache.h            |    2 ++
 read-cache.c       |   27 +++++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/builtin-ls-files.c b/builtin-ls-files.c
index 88e2697..0151647 100644
--- a/builtin-ls-files.c
+++ b/builtin-ls-files.c
@@ -206,33 +206,6 @@ static void show_files(struct dir_struct *dir, const char *prefix)
 	}
 }
 
-/*
- * Prune the index to only contain stuff starting with "prefix"
- */
-static void prune_cache(const char *prefix)
-{
-	int pos = cache_name_pos(prefix, prefix_len);
-	unsigned int first, last;
-
-	if (pos < 0)
-		pos = -pos-1;
-	memmove(active_cache, active_cache + pos,
-		(active_nr - pos) * sizeof(struct cache_entry *));
-	active_nr -= pos;
-	first = 0;
-	last = active_nr;
-	while (last > first) {
-		int next = (last + first) >> 1;
-		struct cache_entry *ce = active_cache[next];
-		if (!strncmp(ce->name, prefix, prefix_len)) {
-			first = next+1;
-			continue;
-		}
-		last = next;
-	}
-	active_nr = last;
-}
-
 static const char *verify_pathspec(const char *prefix)
 {
 	const char **p, *n, *prev;
@@ -541,7 +514,7 @@ int cmd_ls_files(int argc, const char **argv, const char *prefix)
 		show_cached = 1;
 
 	if (prefix)
-		prune_cache(prefix);
+		prune_cache(prefix, prefix_len);
 	if (with_tree) {
 		/*
 		 * Basic sanity check; show-stages and show-unmerged
diff --git a/cache.h b/cache.h
index ab1294d..54660a5 100644
--- a/cache.h
+++ b/cache.h
@@ -335,6 +335,7 @@ static inline void remove_name_hash(struct cache_entry *ce)
 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 #define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
+#define prune_cache(prefix, prefix_len) prune_index((prefix), (prefix_len), &the_index);
 #endif
 
 enum object_type {
@@ -455,6 +456,7 @@ extern int add_file_to_index(struct index_state *, const char *path, int flags);
 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 extern int index_name_is_other(const struct index_state *, const char *, int);
+extern void prune_index(const char *prefix, int prefix_len, struct index_state *istate);
 
 /* do stat comparison even if CE_VALID is true */
 #define CE_MATCH_IGNORE_VALID		01
diff --git a/read-cache.c b/read-cache.c
index 3f58711..74f889e 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1706,3 +1706,30 @@ int index_name_is_other(const struct index_state *istate, const char *name,
 	}
 	return 1;
 }
+
+/*
+ * Prune the index to only contain stuff starting with "prefix"
+ */
+void prune_index(const char *prefix, int prefix_len, struct index_state *istate)
+{
+	int pos = index_name_pos(istate, prefix, prefix_len);
+	unsigned int first, last;
+
+	if (pos < 0)
+		pos = -pos-1;
+	memmove(istate->cache, istate->cache + pos,
+		(istate->cache_nr - pos) * sizeof(struct cache_entry *));
+	istate->cache_nr -= pos;
+	first = 0;
+	last = istate->cache_nr;
+	while (last > first) {
+		int next = (last + first) >> 1;
+		struct cache_entry *ce = istate->cache[next];
+		if (!strncmp(ce->name, prefix, prefix_len)) {
+			first = next+1;
+			continue;
+		}
+		last = next;
+	}
+	istate->cache_nr = last;
+}
-- 
1.6.2.2.602.g83ee9f