Prepare for porcelain status parsing.

src/util-git.scm

@@ -71,4 +71,13 @@
 	(lambda args
 	  (invoke-git repo args))))))
 
+ ;; Returns a dictionary of unknown, modified, deleted and added files
+ (define (git-status repo)
+   (let loop ((lines ((git repo) 'status '--porcelain))
+	      (res (make-ldict)))
+     (if (null? lines)
+	 res
+	 (loop (cdr lines)
+	       res))))
+
  )