[PATCH] git.el: automatically revert emacs buffers

[Sergei Organov <osv@javad.com>]

If new custom variable git-auto-revert is 't', after git-revert-file,
revert corresponding emacs buffers from reverted files provided the
buffers were not changed. This is how pcl-cvs behaves.

* git-auto-revert: new customizable variable.
* git-revert-some-buffers: new function.
* git-revert-file: call git-revert-some-buffers.

Signed-off-by: Sergei Organov <osv@javad.com>
---
 contrib/emacs/git.el |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/contrib/emacs/git.el b/contrib/emacs/git.el
index d8a0638..c3c0c45 100644
--- a/contrib/emacs/git.el
+++ b/contrib/emacs/git.el
@@ -112,6 +112,11 @@ if there is already one that displays the same directory."
   :group 'git
   :type 'boolean)
 
+(defcustom git-auto-revert t
+  "Non-nil if `git-revert-file' should automatically revert corresponding buffers."
+  :group 'git
+  :type 'boolean)
+
 
 (defface git-status-face
   '((((class color) (background light)) (:foreground "purple"))
@@ -989,6 +994,23 @@ Return the list of files that haven't been handled."
           (git-success-message "Removed" files))
       (message "Aborting"))))
 
+;; stolen from pcl-cvs's cvs-revert-if-needed
+(defun git-revert-some-buffers (fis)
+  (dolist (fileinfo fis)
+    (let* ((file (git-fileinfo->name fileinfo))
+	   (buffer (find-buffer-visiting file)))
+      ;; For a revert to happen the user must be editing the file...
+      (unless (or (null buffer)
+		  (buffer-modified-p buffer))
+	(with-current-buffer buffer
+	  (ignore-errors
+	    (revert-buffer 'ignore-auto 'dont-ask 'preserve-modes)
+	    ;; `preserve-modes' avoids changing the (minor) modes.  But we
+	    ;; do want to reset the mode for VC, so we do it explicitly.
+	    (vc-find-file-hook)
+	    (when (eq (git-fileinfo->state fileinfo) 'unmerged)
+	      (smerge-mode 1))))))))
+
 (defun git-revert-file ()
   "Revert changes to the marked file(s)."
   (interactive)
@@ -1008,6 +1030,7 @@ Return the list of files that haven't been handled."
       (when modified
         (apply #'git-call-process-env nil nil "checkout" "HEAD" modified))
       (git-update-status-files (append added modified) 'uptodate)
+      (if git-auto-revert (git-revert-some-buffers files))
       (git-success-message "Reverted" (git-get-filenames files)))))
 
 (defun git-resolve-file ()
-- 
1.5.4.18.gd0b8