Initial implementation of gitignore support

Adds support for .gitignore files to git_status_foreach() and
git_status_file().  This includes refactoring the gitattributes
code to share logic where possible.  The GIT_STATUS_IGNORED flag
will now be passed in for files that are ignored (provided they
are not already in the index or the head of repo).

1 files changed, 23 insertions, 0 deletions

diff --git a/src/path.h b/src/path.h
index c308c5bd4..ceb3bb533 100644
--- a/src/path.h
+++ b/src/path.h
@@ -77,4 +77,27 @@ GIT_INLINE(void) git_path_mkposix(char *path)
 extern int git__percent_decode(git_buf *decoded_out, const char *input);
 extern int git_path_fromurl(git_buf *local_path_out, const char *file_url);
 
+/*
+ * Use as:
+ *
+ *     git_path_walk_up(
+ *         git_buf *path, git_buf *iterator, const char *root_path,
+ *         ... CALLBACK CODE ...)
+ *
+ * to invoke callback directory by directory up the path until the root_path
+ * is reached (inclusive of a final call at the root_path).  If root path is
+ * NULL or the path is not contained in the root_path, then the callback
+ * code will be invoked just once on input path.
+ */
+#define git_path_walk_up(B,IB,ROOT,CODE) do { \
+	ssize_t _stop = ((ROOT) && git__prefixcmp((B)->ptr, (ROOT))) ? (ssize_t)strlen(ROOT) : (B)->size; \
+	ssize_t _scan = (B)->size; char _oldc = '\0'; \
+	(IB)->ptr = (B)->ptr; (IB)->size = (B)->size; \
+	while (_scan >= _stop) { \
+		CODE; \
+		(IB)->ptr[_scan] = _oldc; \
+		_scan = git_buf_rfind_next((IB), '/'); \
+		if (_scan >= 0) { _scan++; _oldc = (IB)->ptr[_scan]; (IB)->size = _scan; (IB)->ptr[_scan] = '\0'; } \
+	} (IB)->ptr[_scan] = _oldc; } while (0)
+
 #endif