Add APIs for git attributes

This adds APIs for querying git attributes.  In addition to
the new API in include/git2/attr.h, most of the action is in
src/attr_file.[hc] which contains utilities for dealing with
a single attributes file, and src/attr.[hc] which contains
the implementation of the APIs that merge all applicable
attributes files.

1 files changed, 87 insertions, 0 deletions

diff --git a/src/attr_file.h b/src/attr_file.h
new file mode 100644
index 000000000..4774f148c
--- /dev/null
+++ b/src/attr_file.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2009-2011 the libgit2 contributors
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_attr_file_h__
+#define INCLUDE_attr_file_h__
+
+#include "git2/attr.h"
+#include "vector.h"
+
+typedef struct {
+	char *pattern;
+	size_t length;
+	int negative;
+	int directory;
+	int fullpath;
+} git_attr_fnmatch;
+
+typedef struct {
+	const char *name;
+	unsigned long name_hash;
+} git_attr_name;
+
+typedef struct {
+	char *name;
+    unsigned long name_hash;
+	size_t name_len;
+    const char *value;
+	int is_allocated;
+} git_attr_assignment;
+
+typedef struct {
+	git_attr_fnmatch match;
+	git_vector assigns; /* <git_attr_assignment*> */
+} git_attr_rule;
+
+typedef struct {
+	char *path;
+	git_vector rules; /* <git_attr_rule*> */
+} git_attr_file;
+
+typedef struct {
+	const char *path;
+	const char *basename;
+	int is_dir;
+} git_attr_path;
+
+/*
+ * git_attr_file API
+ */
+
+extern int git_attr_file__from_buffer(git_attr_file **out, const char *buf);
+extern int git_attr_file__from_file(git_attr_file **out, const char *path);
+
+extern void git_attr_file__free(git_attr_file *file);
+
+extern int git_attr_file__lookup_one(
+	git_attr_file *file,
+	const git_attr_path *path,
+	const char *attr,
+	const char **value);
+
+/* loop over rules in file from bottom to top */
+#define git_attr_file__foreach_matching_rule(file, path, iter, rule)	\
+	git_vector_rforeach(&(file)->rules, (iter), (rule)) \
+		if (git_attr_rule__match_path((rule), (path)) == GIT_SUCCESS)
+
+extern unsigned long git_attr_file__name_hash(const char *name);
+
+
+/*
+ * other utilities
+ */
+
+extern int git_attr_rule__match_path(
+	git_attr_rule *rule,
+	const git_attr_path *path);
+
+extern git_attr_assignment *git_attr_rule__lookup_assignment(
+	git_attr_rule *rule, const char *name);
+
+extern int git_attr_path__init(
+	git_attr_path *info, const char *path);
+
+#endif