Support reading attributes from index

Depending on the operation, we need to consider gitattributes
in both the work dir and the index.  This adds a parameter to
all of the gitattributes related functions that allows user
control of attribute reading behavior (i.e. prefer workdir,
prefer index, only use index).

This fix also covers allowing us to check attributes (and
hence do diff and status) on bare repositories.

This was a somewhat larger change that I hoped because it had
to change the cache key used for gitattributes files.

1 files changed, 16 insertions, 10 deletions

diff --git a/src/attr.h b/src/attr.h
index 43caf1b81..a35b1160f 100644
--- a/src/attr.h
+++ b/src/attr.h
@@ -22,6 +22,9 @@ typedef struct {
 	const char *cfg_excl_file; /* cached value of core.excludesfile */
 } git_attr_cache;
 
+typedef int (*git_attr_file_parser)(
+	git_repository *, const char *, git_attr_file *);
+
 extern int git_attr_cache__init(git_repository *repo);
 
 extern int git_attr_cache__insert_macro(
@@ -30,21 +33,24 @@ extern int git_attr_cache__insert_macro(
 extern git_attr_rule *git_attr_cache__lookup_macro(
 	git_repository *repo, const char *name);
 
-extern int git_attr_cache__lookup_or_create_file(
+extern int git_attr_cache__push_file(
 	git_repository *repo,
-	const char *key,
+	const char *base,
 	const char *filename,
-	int (*loader)(git_repository *, const char *, git_attr_file *),
-	git_attr_file **file_ptr);
+	git_attr_file_source source,
+	git_attr_file_parser parse,
+	git_vector *stack);
 
-extern int git_attr_cache__push_file(
+extern int git_attr_cache__internal_file(
 	git_repository *repo,
-	git_vector     *stack,
-	const char     *base,
-	const char     *filename,
-	int (*loader)(git_repository *, const char *, git_attr_file *));
+	const char *key,
+	git_attr_file **file_ptr);
 
 /* returns true if path is in cache */
-extern bool git_attr_cache__is_cached(git_repository *repo, const char *path);
+extern bool git_attr_cache__is_cached(
+	git_repository *repo, git_attr_file_source source, const char *path);
+
+extern int git_attr_cache__decide_sources(
+	uint32_t flags, bool has_wd, bool has_index, git_attr_file_source *srcs);
 
 #endif