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+;;; vc-git.el --- VC backend for the git version control system
+
+;; Copyright (C) 2006 Alexandre Julliard
+
+;; 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., 59 Temple Place, Suite 330, Boston,
+;; MA 02111-1307 USA
+
+;;; Commentary:
+
+;; This file contains a VC backend for the git version control
+;; system.
+;;
+;; To install: put this file on the load-path and add GIT to the list
+;; of supported backends in `vc-handled-backends'; the following line,
+;; placed in your ~/.emacs, will accomplish this:
+;;
+;;     (add-to-list 'vc-handled-backends 'GIT)
+;;
+;; TODO
+;;  - changelog generation
+;;  - working with revisions other than HEAD
+;;
+
+(eval-when-compile (require 'cl))
+
+(defvar git-commits-coding-system 'utf-8
+  "Default coding system for git commits.")
+
+(defun vc-git--run-command-string (file &rest args)
+  "Run a git command on FILE and return its output as string."
+  (let* ((ok t)
+         (str (with-output-to-string
+                (with-current-buffer standard-output
+                  (unless (eq 0 (apply #'call-process "git" nil '(t nil) nil
+                                       (append args (list (file-relative-name file)))))
+                    (setq ok nil))))))
+    (and ok str)))
+
+(defun vc-git--run-command (file &rest args)
+  "Run a git command on FILE, discarding any output."
+  (let ((name (file-relative-name file)))
+    (eq 0 (apply #'call-process "git" nil (get-buffer "*Messages") nil (append args (list name))))))
+
+(defun vc-git-registered (file)
+  "Check whether FILE is registered with git."
+  (with-temp-buffer
+    (let* ((dir (file-name-directory file))
+           (name (file-relative-name file dir)))
+      (and (ignore-errors
+             (when dir (cd dir))
+             (eq 0 (call-process "git" nil '(t nil) nil "ls-files" "-c" "-z" "--" name)))
+           (let ((str (buffer-string)))
+             (and (> (length str) (length name))
+                  (string= (substring str 0 (1+ (length name))) (concat name "\0"))))))))
+
+(defun vc-git-state (file)
+  "git-specific version of `vc-state'."
+  (let ((diff (vc-git--run-command-string file "diff-index" "-z" "HEAD" "--")))
+    (if (and diff (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} [ADMU]\0[^\0]+\0" diff))
+        'edited
+      'up-to-date)))
+
+(defun vc-git-workfile-version (file)
+  "git-specific version of `vc-workfile-version'."
+  (let ((str (with-output-to-string
+               (with-current-buffer standard-output
+                 (call-process "git" nil '(t nil) nil "symbolic-ref" "HEAD")))))
+    (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
+        (match-string 2 str)
+      str)))
+
+(defun vc-git-revert (file &optional contents-done)
+  "Revert FILE to the version stored in the git repository."
+  (if contents-done
+      (vc-git--run-command file "update-index" "--")
+    (vc-git--run-command file "checkout" "HEAD")))
+
+(defun vc-git-checkout-model (file)
+  'implicit)
+
+(defun vc-git-workfile-unchanged-p (file)
+  (let ((sha1 (vc-git--run-command-string file "hash-object" "--"))
+        (head (vc-git--run-command-string file "ls-tree" "-z" "HEAD" "--")))
+    (and head
+         (string-match "[0-7]\\{6\\} blob \\([0-9a-f]\\{40\\}\\)\t[^\0]+\0" head)
+         (string= (car (split-string sha1 "\n")) (match-string 1 head)))))
+
+(defun vc-git-register (file &optional rev comment)
+  "Register FILE into the git version-control system."
+  (vc-git--run-command file "update-index" "--add" "--"))
+
+(defun vc-git-print-log (file &optional buffer)
+  (let ((name (file-relative-name file))
+        (coding-system-for-read git-commits-coding-system))
+    (vc-do-command buffer 'async "git" name "rev-list" "--pretty" "HEAD" "--")))
+
+(defun vc-git-diff (file &optional rev1 rev2 buffer)
+  (let ((name (file-relative-name file))
+        (buf (or buffer "*vc-diff*")))
+    (if (and rev1 rev2)
+        (vc-do-command buf 0 "git" name "diff-tree" "-p" rev1 rev2 "--")
+      (vc-do-command buf 0 "git" name "diff-index" "-p" (or rev1 "HEAD") "--"))
+    ; git-diff-index doesn't set exit status like diff does
+    (if (vc-git-workfile-unchanged-p file) 0 1)))
+
+(defun vc-git-checkin (file rev comment)
+  (let ((coding-system-for-write git-commits-coding-system))
+    (vc-git--run-command file "commit" "-m" comment "--only" "--")))
+
+(defun vc-git-checkout (file &optional editable rev destfile)
+  (if destfile
+      (let ((fullname (substring
+                       (vc-git--run-command-string file "ls-files" "-z" "--full-name" "--")
+                       0 -1))
+            (coding-system-for-read 'no-conversion)
+            (coding-system-for-write 'no-conversion))
+        (with-temp-file destfile
+          (eq 0 (call-process "git" nil t nil "cat-file" "blob"
+                              (concat (or rev "HEAD") ":" fullname)))))
+    (vc-git--run-command file "checkout" (or rev "HEAD"))))
+
+(defun vc-git-annotate-command (file buf &optional rev)
+  ; FIXME: rev is ignored
+  (let ((name (file-relative-name file)))
+    (call-process "git" nil buf nil "blame" name)))
+
+(defun vc-git-annotate-time ()
+  (and (re-search-forward "[0-9a-f]+ (.* \\([0-9]+\\)-\\([0-9]+\\)-\\([0-9]+\\) \\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\) \\([-+0-9]+\\) +[0-9]+)" nil t)
+       (vc-annotate-convert-time
+        (apply #'encode-time (mapcar (lambda (match) (string-to-number (match-string match))) '(6 5 4 3 2 1 7))))))
+
+;; Not really useful since we can't do anything with the revision yet
+;;(defun vc-annotate-extract-revision-at-line ()
+;;  (save-excursion
+;;    (move-beginning-of-line 1)
+;;    (and (looking-at "[0-9a-f]+")
+;;         (buffer-substring (match-beginning 0) (match-end 0)))))
+
+(provide 'vc-git)