1 ;;; vc-git.el --- VC backend for the git version control system
3 ;; Copyright (C) 2006 Alexandre Julliard
5 ;; This program is free software; you can redistribute it and/or
6 ;; modify it under the terms of the GNU General Public License as
7 ;; published by the Free Software Foundation; either version 2 of
8 ;; the License, or (at your option) any later version.
10 ;; This program is distributed in the hope that it will be
11 ;; useful, but WITHOUT ANY WARRANTY; without even the implied
12 ;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 ;; PURPOSE. See the GNU General Public License for more details.
15 ;; You should have received a copy of the GNU General Public
16 ;; License along with this program; if not, write to the Free
17 ;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 ;; This file contains a VC backend for the git version control
25 ;; To install: put this file on the load-path and add GIT to the list
26 ;; of supported backends in `vc-handled-backends'.
29 ;; - changelog generation
30 ;; - working with revisions other than HEAD
33 (defvar git-commits-coding-system 'utf-8
34 "Default coding system for git commits.")
36 (defun vc-git--run-command-string (file &rest args)
37 "Run a git command on FILE and return its output as string."
39 (str (with-output-to-string
40 (with-current-buffer standard-output
41 (unless (eq 0 (apply #'call-process "git" nil '(t nil) nil
42 (append args (list (file-relative-name file)))))
46 (defun vc-git--run-command (file &rest args)
47 "Run a git command on FILE, discarding any output."
48 (let ((name (file-relative-name file)))
49 (eq 0 (apply #'call-process "git" nil (get-buffer "*Messages") nil (append args (list name))))))
51 (defun vc-git-registered (file)
52 "Check whether FILE is registered with git."
54 (let* ((dir (file-name-directory file))
55 (name (file-relative-name file dir)))
57 (and (eq 0 (call-process "git" nil '(t nil) nil "ls-files" "-c" "-z" "--" name))
58 (let ((str (buffer-string)))
59 (and (> (length str) (length name))
60 (string= (substring str 0 (1+ (length name))) (concat name "\0"))))))))
62 (defun vc-git-state (file)
63 "git-specific version of `vc-state'."
64 (let ((diff (vc-git--run-command-string file "diff-index" "-z" "HEAD" "--")))
65 (if (and diff (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} [ADMU]\0[^\0]+\0" diff))
69 (defun vc-git-workfile-version (file)
70 "git-specific version of `vc-workfile-version'."
71 (let ((str (with-output-to-string
72 (with-current-buffer standard-output
73 (call-process "git" nil '(t nil) nil "symbolic-ref" "HEAD")))))
74 (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
78 (defun vc-git-revert (file &optional contents-done)
79 "Revert FILE to the version stored in the git repository."
81 (vc-git--run-command file "update-index" "--")
82 (vc-git--run-command file "checkout" "HEAD")))
84 (defun vc-git-checkout-model (file)
87 (defun vc-git-workfile-unchanged-p (file)
88 (let ((sha1 (vc-git--run-command-string file "hash-object" "--"))
89 (head (vc-git--run-command-string file "ls-tree" "-z" "HEAD" "--")))
91 (string-match "[0-7]\\{6\\} blob \\([0-9a-f]\\{40\\}\\)\t[^\0]+\0" head)
92 (string= (car (split-string sha1 "\n")) (match-string 1 head)))))
94 (defun vc-git-register (file &optional rev comment)
95 "Register FILE into the git version-control system."
96 (vc-git--run-command file "update-index" "--add" "--"))
98 (defun vc-git-print-log (file)
99 (let ((name (file-relative-name file))
100 (coding-system-for-read git-commits-coding-system))
101 (vc-do-command nil 'async "git" name "rev-list" "--pretty" "HEAD" "--")))
103 (defun vc-git-diff (file &optional rev1 rev2)
104 (let ((name (file-relative-name file)))
106 (vc-do-command "*vc-diff*" 0 "git" name "diff-tree" "-p" rev1 rev2 "--")
107 (vc-do-command "*vc-diff*" 0 "git" name "diff-index" "-p" (or rev1 "HEAD") "--"))
108 ; git-diff-index doesn't set exit status like diff does
109 (if (vc-git-workfile-unchanged-p file) 0 1)))
111 (defun vc-git-checkin (file rev comment)
112 (let ((coding-system-for-write git-commits-coding-system))
113 (vc-git--run-command file "commit" "-m" comment "--only" "--")))
115 (defun vc-git-checkout (file &optional editable rev destfile)
116 (vc-git--run-command file "checkout" (or rev "HEAD")))
118 (defun vc-git-annotate-command (file buf &optional rev)
119 ; FIXME: rev is ignored
120 (let ((name (file-relative-name file)))
121 (call-process "git" nil buf nil "annotate" name)))
123 (defun vc-git-annotate-time ()
124 (and (re-search-forward "[0-9a-f]+\t(.*\t\\([0-9]+\\)-\\([0-9]+\\)-\\([0-9]+\\) \\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\) \\([-+0-9]+\\)\t[0-9]+)" nil t)
125 (vc-annotate-convert-time
126 (apply #'encode-time (mapcar (lambda (match) (string-to-number (match-string match))) '(6 5 4 3 2 1 7))))))
128 ;; Not really useful since we can't do anything with the revision yet
129 ;;(defun vc-annotate-extract-revision-at-line ()
131 ;; (move-beginning-of-line 1)
132 ;; (and (looking-at "[0-9a-f]+")
133 ;; (buffer-substring (match-beginning 0) (match-end 0)))))