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1 | ;;; vc-git.el --- VC backend for the git version control system |
2 | ||
3 | ;; Copyright (C) 2006, 2007 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Alexandre Julliard | |
6 | ;; Keywords: tools | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
23 | ;; Boston, MA 02110-1301, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This file contains a VC backend for the git version control | |
28 | ;; system. | |
29 | ;; | |
30 | ||
31 | ;;; Installation: | |
32 | ||
33 | ;; To install: put this file on the load-path and add GIT to the list | |
34 | ;; of supported backends in `vc-handled-backends'; the following line, | |
35 | ;; placed in your ~/.emacs, will accomplish this: | |
36 | ;; | |
37 | ;; (add-to-list 'vc-handled-backends 'GIT) | |
38 | ||
39 | ;;; Todo: | |
40 | ;; - changelog generation | |
41 | ;; - working with revisions other than HEAD | |
42 | ;; | |
43 | ||
44 | (eval-when-compile (require 'cl)) | |
45 | ||
46 | (defvar git-commits-coding-system 'utf-8 | |
47 | "Default coding system for git commits.") | |
48 | ||
49 | (defun vc-git-registered (file) | |
50 | "Check whether FILE is registered with git." | |
51 | (with-temp-buffer | |
52 | (let* ((dir (file-name-directory file)) | |
53 | (name (file-relative-name file dir))) | |
54 | (and (ignore-errors | |
55 | (when dir (cd dir)) | |
56 | (eq 0 (call-process "git" nil '(t nil) nil "ls-files" "-c" "-z" "--" name))) | |
57 | (let ((str (buffer-string))) | |
58 | (and (> (length str) (length name)) | |
59 | (string= (substring str 0 (1+ (length name))) (concat name "\0")))))))) | |
60 | ||
61 | (defun vc-git-state (file) | |
62 | "git-specific version of `vc-state'." | |
63 | (let ((diff (vc-git--run-command-string file "diff-index" "-z" "HEAD" "--"))) | |
64 | (if (and diff (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} [ADMU]\0[^\0]+\0" diff)) | |
65 | 'edited | |
66 | 'up-to-date))) | |
67 | ||
68 | (defun vc-git-workfile-version (file) | |
69 | "git-specific version of `vc-workfile-version'." | |
70 | (let ((str (with-output-to-string | |
71 | (with-current-buffer standard-output | |
72 | (call-process "git" nil '(t nil) nil "symbolic-ref" "HEAD"))))) | |
73 | (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str) | |
74 | (match-string 2 str) | |
75 | str))) | |
76 | ||
77 | (defun vc-git-checkout-model (file) | |
78 | 'implicit) | |
79 | ||
80 | (defun vc-git-workfile-unchanged-p (file) | |
81 | (let ((sha1 (vc-git--run-command-string file "hash-object" "--")) | |
82 | (head (vc-git--run-command-string file "ls-tree" "-z" "HEAD" "--"))) | |
83 | (and head | |
84 | (string-match "[0-7]\\{6\\} blob \\([0-9a-f]\\{40\\}\\)\t[^\0]+\0" head) | |
85 | (string= (car (split-string sha1 "\n")) (match-string 1 head))))) | |
86 | ||
87 | (defun vc-git-register (file &optional rev comment) | |
88 | "Register FILE into the git version-control system." | |
89 | (vc-git--run-command file "update-index" "--add" "--")) | |
90 | ||
91 | (defun vc-git-checkin (file rev comment) | |
92 | (let ((coding-system-for-write git-commits-coding-system)) | |
93 | (vc-git--run-command file "commit" "-m" comment "--only" "--"))) | |
94 | ||
95 | (defun vc-git-checkout (file &optional editable rev destfile) | |
96 | (if destfile | |
97 | (let ((fullname (substring | |
98 | (vc-git--run-command-string file "ls-files" "-z" "--full-name" "--") | |
99 | 0 -1)) | |
100 | (coding-system-for-read 'no-conversion) | |
101 | (coding-system-for-write 'no-conversion)) | |
102 | (with-temp-file destfile | |
103 | (eq 0 (call-process "git" nil t nil "cat-file" "blob" | |
104 | (concat (or rev "HEAD") ":" fullname))))) | |
105 | (vc-git--run-command file "checkout" (or rev "HEAD")))) | |
106 | ||
107 | (defun vc-git-revert (file &optional contents-done) | |
108 | "Revert FILE to the version stored in the git repository." | |
109 | (if contents-done | |
110 | (vc-git--run-command file "update-index" "--") | |
111 | (vc-git--run-command file "checkout" "HEAD"))) | |
112 | ||
113 | (defun vc-git-print-log (file &optional buffer) | |
114 | (let ((name (file-relative-name file)) | |
115 | (coding-system-for-read git-commits-coding-system)) | |
116 | (vc-do-command buffer 'async "git" name "rev-list" "--pretty" "HEAD" "--"))) | |
117 | ||
118 | (defun vc-git-diff (file &optional rev1 rev2 buffer) | |
119 | (let ((name (file-relative-name file)) | |
120 | (buf (or buffer "*vc-diff*"))) | |
121 | (if (and rev1 rev2) | |
122 | (vc-do-command buf 0 "git" name "diff-tree" "-p" rev1 rev2 "--") | |
123 | (vc-do-command buf 0 "git" name "diff-index" "-p" (or rev1 "HEAD") "--")) | |
124 | ; git-diff-index doesn't set exit status like diff does | |
125 | (if (vc-git-workfile-unchanged-p file) 0 1))) | |
126 | ||
127 | (defun vc-git-annotate-command (file buf &optional rev) | |
128 | ; FIXME: rev is ignored | |
129 | (let ((name (file-relative-name file))) | |
130 | (call-process "git" nil buf nil "blame" name))) | |
131 | ||
132 | (defun vc-git-annotate-time () | |
133 | (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) | |
134 | (vc-annotate-convert-time | |
135 | (apply #'encode-time (mapcar (lambda (match) (string-to-number (match-string match))) '(6 5 4 3 2 1 7)))))) | |
136 | ||
137 | ;; Not really useful since we can't do anything with the revision yet | |
138 | ;;(defun vc-annotate-extract-revision-at-line () | |
139 | ;; (save-excursion | |
140 | ;; (move-beginning-of-line 1) | |
141 | ;; (and (looking-at "[0-9a-f]+") | |
142 | ;; (buffer-substring (match-beginning 0) (match-end 0))))) | |
143 | ||
144 | (defun vc-git-previous-version (file rev) | |
145 | "git-specific version of `vc-previous-version'." | |
146 | (let ((default-directory (file-name-directory (expand-file-name file))) | |
147 | (file (file-name-nondirectory file))) | |
148 | (vc-git-symbolic-commit | |
149 | (with-temp-buffer | |
150 | (and | |
151 | (zerop | |
152 | (call-process "git" nil '(t nil) nil "rev-list" | |
153 | "-2" rev "--" file)) | |
154 | (goto-char (point-max)) | |
155 | (bolp) | |
156 | (zerop (forward-line -1)) | |
157 | (not (bobp)) | |
158 | (buffer-substring-no-properties | |
159 | (point) | |
160 | (1- (point-max)))))))) | |
161 | ||
162 | (defun vc-git-next-version (file rev) | |
163 | "git-specific version of `vc-next-version'." | |
164 | (let* ((default-directory (file-name-directory | |
165 | (expand-file-name file))) | |
166 | (file (file-name-nondirectory file)) | |
167 | (current-rev | |
168 | (with-temp-buffer | |
169 | (and | |
170 | (zerop | |
171 | (call-process "git" nil '(t nil) nil "rev-list" | |
172 | "-1" rev "--" file)) | |
173 | (goto-char (point-max)) | |
174 | (bolp) | |
175 | (zerop (forward-line -1)) | |
176 | (bobp) | |
177 | (buffer-substring-no-properties | |
178 | (point) | |
179 | (1- (point-max))))))) | |
180 | (and current-rev | |
181 | (vc-git-symbolic-commit | |
182 | (with-temp-buffer | |
183 | (and | |
184 | (zerop | |
185 | (call-process "git" nil '(t nil) nil "rev-list" | |
186 | "HEAD" "--" file)) | |
187 | (goto-char (point-min)) | |
188 | (search-forward current-rev nil t) | |
189 | (zerop (forward-line -1)) | |
190 | (buffer-substring-no-properties | |
191 | (point) | |
192 | (progn (forward-line 1) (1- (point)))))))))) | |
193 | ||
194 | \f | |
195 | ;; Internal commands | |
196 | ||
197 | (defun vc-git--run-command-string (file &rest args) | |
198 | "Run a git command on FILE and return its output as string." | |
199 | (let* ((ok t) | |
200 | (str (with-output-to-string | |
201 | (with-current-buffer standard-output | |
202 | (unless (eq 0 (apply #'call-process "git" nil '(t nil) nil | |
203 | (append args (list (file-relative-name file))))) | |
204 | (setq ok nil)))))) | |
205 | (and ok str))) | |
206 | ||
207 | (defun vc-git--run-command (file &rest args) | |
208 | "Run a git command on FILE, discarding any output." | |
209 | (let ((name (file-relative-name file))) | |
210 | (eq 0 (apply #'call-process "git" nil (get-buffer "*Messages") nil (append args (list name)))))) | |
211 | ||
212 | (defun vc-git-symbolic-commit (commit) | |
213 | "Translate COMMIT string into symbolic form. | |
214 | Returns nil if not possible." | |
215 | (and commit | |
216 | (with-temp-buffer | |
217 | (and | |
218 | (zerop | |
219 | (call-process "git" nil '(t nil) nil "name-rev" | |
220 | "--name-only" "--tags" | |
221 | commit)) | |
222 | (goto-char (point-min)) | |
223 | (= (forward-line 2) 1) | |
224 | (bolp) | |
225 | (buffer-substring-no-properties (point-min) (1- (point-max))))))) | |
226 | ||
227 | (provide 'vc-git) |