Export three helper functions from ls-files

This exports three helper functions from ls-files.

 * pathspec_match() checks if a given path matches a set of pathspecs
   and optionally records which pathspec was used.  This function used
   to be called "match()" but renamed to be a bit less vague.

 * report_path_error() takes a set of pathspecs and the record
   pathspec_match() above leaves, and gives error message.  This
   was split out of the main function of ls-files.

 * overlay_tree_on_cache() takes a tree-ish (typically "HEAD")
   and overlays it on the current in-core index.  By iterating
   over the resulting index, the caller can find out the paths
   in either the index or the HEAD.  This function used to be
   called "overlay_tree()" but renamed to be a bit more
   descriptive.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index 33ebccf48..26eec229e 100644
--- a/cache.h
+++ b/cache.h
@@ -610,4 +610,10 @@ extern int diff_auto_refresh_index;
 /* match-trees.c */
 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 
+
+/* ls-files */
+int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
+int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
+void overlay_tree_on_cache(const char *tree_name, const char *prefix);
+
 #endif /* CACHE_H */