;;; log-view.el --- Major mode for browsing RCS/CVS/SCCS log output

;; Copyright (C) 1999, 2000, 2001  Free Software Foundation, Inc.

;; Author: Stefan Monnier <monnier@cs.yale.edu>
;; Keywords: rcs sccs cvs log version-control

;; This file is part of GNU Emacs.

;; GNU Emacs 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, or (at your option)
;; any later version.

;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Todo:

;; - add compatibility with cvs-log.el
;; - add ability to modify a log-entry (via cvs-mode-admin ;-)
;; - remove references to cvs-*

;;; Code:

(eval-when-compile (require 'cl))
(require 'pcvs-util)
(autoload 'vc-version-diff "vc")

(defgroup log-view nil
  "Major mode for browsing log output of RCS/CVS/SCCS."
  :group 'pcl-cvs
  :prefix "log-view-")

(easy-mmode-defmap log-view-mode-map
  '(("q" . quit-window)
    ("z" . kill-this-buffer)
    ("m" . set-mark-command)
    ;; ("e" . cvs-mode-edit-log)
    ("d" . log-view-diff)
    ("f" . log-view-find-version)
    ("n" . log-view-msg-next)
    ("p" . log-view-msg-prev)
    ("N" . log-view-file-next)
    ("P" . log-view-file-prev)
    ("\M-n" . log-view-file-next)
    ("\M-p" . log-view-file-prev))
  "Log-View's keymap."
  :group 'log-view
  ;; Here I really need either buffer-local keymap-inheritance
  ;; or a minor-mode-map with lower precedence than the local map.
  :inherit (if (boundp 'cvs-mode-map) cvs-mode-map))

(defvar log-view-mode-hook nil
  "Hook run at the end of `log-view-mode'.")

(defface log-view-file-face
  '((((class color) (background light))
     (:background "grey70" :weight bold))
    (t (:weight bold)))
  "Face for the file header line in `log-view-mode'."
  :group 'log-view)
(defvar log-view-file-face 'log-view-file-face)

(defface log-view-message-face
  '((((class color) (background light))
     (:background "grey85"))
    (t (:weight bold)))
  "Face for the message header line in `log-view-mode'."
  :group 'log-view)
(defvar log-view-message-face 'log-view-message-face)

(defconst log-view-file-re
  (concat "^\\("
	  "Working file: \\(.+\\)"
	  "\\|SCCS/s\\.\\(.+\\):"
	  "\\)\n"))
;; In RCS, a locked revision will look like "revision N.M\tlocked by: FOO".
(defconst log-view-message-re "^\\(revision \\([.0-9]+\\)\\(?:\t.*\\)?\\|rev \\([0-9]+\\):  .*\\|D \\([.0-9]+\\) .*\\)$")

(defconst log-view-font-lock-keywords
  `((,log-view-file-re
     (2 (if (boundp 'cvs-filename-face) cvs-filename-face) nil t)
     (3 (if (boundp 'cvs-filename-face) cvs-filename-face) nil t)
     (0 log-view-file-face append))
    (,log-view-message-re . log-view-message-face)))
(defconst log-view-font-lock-defaults
  '(log-view-font-lock-keywords t nil nil nil))

;;;;
;;;; Actual code
;;;;

;;;###autoload
(define-derived-mode log-view-mode fundamental-mode "Log-View"
  "Major mode for browsing CVS log output."
  (setq buffer-read-only t)
  (set (make-local-variable 'font-lock-defaults) log-view-font-lock-defaults)
  (set (make-local-variable 'cvs-minor-wrap-function) 'log-view-minor-wrap))

;;;;
;;;; Navigation
;;;;

;; define log-view-{msg,file}-{next,prev}
(easy-mmode-define-navigation log-view-msg log-view-message-re "log message")
(easy-mmode-define-navigation log-view-file log-view-file-re "file")

(defun log-view-goto-rev (rev)
  (goto-char (point-min))
  (ignore-errors
    (while (not (equal rev (log-view-current-tag)))
      (log-view-msg-next))
    t))

;;;;
;;;; Linkage to PCL-CVS (mostly copied from cvs-status.el)
;;;;

(defconst log-view-dir-re "^cvs[.ex]* [a-z]+: Logging \\(.+\\)$")

(defun log-view-current-file ()
  (save-excursion
    (forward-line 1)
    (or (re-search-backward log-view-file-re nil t)
	(re-search-forward log-view-file-re))
    (let* ((file (or (match-string 2) (match-string 3)))
	   (cvsdir (and (re-search-backward log-view-dir-re nil t)
			(match-string 1)))
	   (pcldir (and (boundp 'cvs-pcl-cvs-dirchange-re)
			(re-search-backward cvs-pcl-cvs-dirchange-re nil t)
			(match-string 1)))
	   (dir ""))
      (let ((default-directory ""))
	(when pcldir (setq dir (expand-file-name pcldir dir)))
	(when cvsdir (setq dir (expand-file-name cvsdir dir))))
      (expand-file-name file dir))))

(defun log-view-current-tag (&optional where)
  (save-excursion
    (when where (goto-char where))
    (forward-line 1)
    (let ((pt (point)))
      (when (re-search-backward log-view-message-re nil t)
	(let ((rev (or (match-string 2) (match-string 3) (match-string 4))))
	  (unless (re-search-forward log-view-file-re pt t)
	    rev))))))

(defun log-view-minor-wrap (buf f)
  (let ((data (with-current-buffer buf
		(cons
		 (cons (log-view-current-file)
		       (log-view-current-tag))
		 (when mark-active
		   (save-excursion
		     (goto-char (mark))
		     (cons (log-view-current-file)
			   (log-view-current-tag))))))))
    (let ((cvs-branch-prefix (cdar data))
	  (cvs-secondary-branch-prefix (and (cdar data) (cddr data)))
	  (cvs-minor-current-files
	   (cons (caar data)
		 (when (and (cadr data) (not (equal (caar data) (cadr data))))
		   (list (cadr data)))))
	  ;; FIXME:  I need to force because the fileinfos are UNKNOWN
	  (cvs-force-command "/F"))
      (funcall f))))

(defun log-view-find-version (pos)
  "Visit the version at point."
  (interactive "d")
  (save-excursion
    (goto-char pos)
    (switch-to-buffer (vc-find-version (log-view-current-file)
                                       (log-view-current-tag)))))

;;
;; diff
;;

(defun log-view-diff (beg end)
  "Get the diff for several revisions.
If the point is the same as the mark, get the diff for this revision.
Otherwise, get the diff between the revisions
 were the region starts and ends."
  (interactive "r")
  (let ((fr (log-view-current-tag beg))
        (to (log-view-current-tag end)))
    (when (string-equal fr to)
      (save-excursion
        (goto-char end)
        (log-view-msg-next)
        (setq to (log-view-current-tag))))
    (vc-version-diff (log-view-current-file) to fr)))

(provide 'log-view)

;;; arch-tag: 0d64220b-ce7e-4f62-9c2a-6b04c2f81f4f
;;; log-view.el ends here
