source: cl-darcs/trunk/display-patch.lisp

;;; Copyright (C) 2006 Magnus Henoch
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 2 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

(in-package :darcs)

(defgeneric display-patch (patch stream)
  (:documentation
   "Print an elaborate and readable description of PATCH to STREAM."))

(defmethod display-patch ((patch patch) stream)
  "When no display method is defined, write a terse description."
  (print patch stream))

(defmethod display-patch ((patch hunk-patch) stream)
  (format stream "~&~A: ~A~[~:;~:*-~A~]~[~:;~:*+~A~]"
            (patch-filename patch)
            (hunk-line-number patch)
            (length (hunk-old-lines patch))
            (length (hunk-new-lines patch)))
  (dolist (old (hunk-old-lines patch))
    (format stream "~&-~A" (bytes-to-string old)))
  (dolist (new (hunk-new-lines patch))
    (format stream "~&+~A" (bytes-to-string new))))