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[emacs.git] / lisp / vc-git.el
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1 ;;; vc-git.el --- VC backend for the git version control system
3 ;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
5 ;; Author: Alexandre Julliard <julliard@winehq.org>
6 ;; Keywords: tools
8 ;; This file is part of GNU Emacs.
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 3, or (at your option)
13 ;; any later version.
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.
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.
25 ;;; Commentary:
27 ;; This file contains a VC backend for the git version control
28 ;; system.
31 ;;; Installation:
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:
37 ;; (add-to-list 'vc-handled-backends 'Git)
39 ;;; Todo:
40 ;; - check if more functions could use vc-git-command instead
41 ;; of start-process.
42 ;; - changelog generation
44 ;; Implement the rest of the vc interface. See the comment at the
45 ;; beginning of vc.el. The current status is:
46 ;; ("??" means: "figure out what to do about it")
48 ;; FUNCTION NAME STATUS
49 ;; BACKEND PROPERTIES
50 ;; * revision-granularity OK
51 ;; STATE-QUERYING FUNCTIONS
52 ;; * registered (file) OK
53 ;; * state (file) OK
54 ;; - state-heuristic (file) NOT NEEDED
55 ;; - dir-state (dir) OK
56 ;; * working-revision (file) OK
57 ;; - latest-on-branch-p (file) NOT NEEDED
58 ;; * checkout-model (file) OK
59 ;; - workfile-unchanged-p (file) OK
60 ;; - mode-line-string (file) OK
61 ;; - dired-state-info (file) OK
62 ;; STATE-CHANGING FUNCTIONS
63 ;; * create-repo () OK
64 ;; * register (files &optional rev comment) OK
65 ;; - init-revision (file) NOT NEEDED
66 ;; - responsible-p (file) OK
67 ;; - could-register (file) NOT NEEDED, DEFAULT IS GOOD
68 ;; - receive-file (file rev) NOT NEEDED
69 ;; - unregister (file) OK
70 ;; * checkin (files rev comment) OK
71 ;; * find-revision (file rev buffer) OK
72 ;; * checkout (file &optional editable rev) OK
73 ;; * revert (file &optional contents-done) OK
74 ;; - rollback (files) COULD BE SUPPORTED
75 ;; - merge (file rev1 rev2) It would be possible to merge changes into
76 ;; a single file, but when committing they
77 ;; wouldn't be identified as a merge by git,
78 ;; so it's probably not a good idea.
79 ;; - merge-news (file) see `merge'
80 ;; - steal-lock (file &optional revision) NOT NEEDED
81 ;; HISTORY FUNCTIONS
82 ;; * print-log (files &optional buffer) OK
83 ;; - log-view-mode () OK
84 ;; - show-log-entry (revision) OK
85 ;; - wash-log (file) COULD BE SUPPORTED
86 ;; - logentry-check () NOT NEEDED
87 ;; - comment-history (file) ??
88 ;; - update-changelog (files) COULD BE SUPPORTED
89 ;; * diff (file &optional rev1 rev2 buffer) OK
90 ;; - revision-completion-table (files) NEEDED?
91 ;; - annotate-command (file buf &optional rev) OK
92 ;; - annotate-time () OK
93 ;; - annotate-current-time () NOT NEEDED
94 ;; - annotate-extract-revision-at-line () OK
95 ;; SNAPSHOT SYSTEM
96 ;; - create-snapshot (dir name branchp) OK
97 ;; - assign-name (file name) NOT NEEDED
98 ;; - retrieve-snapshot (dir name update) OK, needs to update buffers
99 ;; MISCELLANEOUS
100 ;; - make-version-backups-p (file) NOT NEEDED
101 ;; - repository-hostname (dirname) NOT NEEDED
102 ;; - previous-revision (file rev) OK
103 ;; - next-revision (file rev) OK
104 ;; - check-headers () COULD BE SUPPORTED
105 ;; - clear-headers () NOT NEEDED
106 ;; - delete-file (file) OK
107 ;; - rename-file (old new) OK
108 ;; - find-file-hook () NOT NEEDED
109 ;; - find-file-not-found-hook () NOT NEEDED
111 (eval-when-compile (require 'cl) (require 'vc))
113 (defvar git-commits-coding-system 'utf-8
114 "Default coding system for git commits.")
116 ;;; BACKEND PROPERTIES
118 (defun vc-git-revision-granularity ()
119 'repository)
121 ;;; STATE-QUERYING FUNCTIONS
123 ;;;###autoload (defun vc-git-registered (file)
124 ;;;###autoload "Return non-nil if FILE is registered with git."
125 ;;;###autoload (if (vc-find-root file ".git") ; short cut
126 ;;;###autoload (progn
127 ;;;###autoload (load "vc-git")
128 ;;;###autoload (vc-git-registered file))))
130 (defun vc-git-registered (file)
131 "Check whether FILE is registered with git."
132 (when (vc-git-root file)
133 (with-temp-buffer
134 (let* ((dir (file-name-directory file))
135 (name (file-relative-name file dir)))
136 (and (ignore-errors
137 (when dir (cd dir))
138 (vc-git--out-ok "ls-files" "-c" "-z" "--" name))
139 (let ((str (buffer-string)))
140 (and (> (length str) (length name))
141 (string= (substring str 0 (1+ (length name)))
142 (concat name "\0")))))))))
144 (defun vc-git-state (file)
145 "Git-specific version of `vc-state'."
146 ;; FIXME: This can't set 'ignored yet
147 (vc-git--call nil "add" "--refresh" "--" (file-relative-name file))
148 (let ((diff (vc-git--run-command-string file "diff-index" "-z" "HEAD" "--")))
149 (if (and diff (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} [ADMU]\0[^\0]+\0"
150 diff))
151 'edited
152 'up-to-date)))
154 (defun vc-git--ls-files-state (state &rest args)
155 "Set state to STATE on all files found with git-ls-files ARGS."
156 (with-temp-buffer
157 (apply 'vc-git-command (current-buffer) nil nil "ls-files" "-z" args)
158 (goto-char (point-min))
159 (let ((start (point)))
160 (while (search-forward "\0" nil t)
161 (let ((file (expand-file-name
162 (buffer-substring-no-properties start (1- (point))))))
163 (vc-file-setprop file 'vc-backend (if state 'Git 'none))
164 (vc-file-setprop file 'vc-state state))
165 (setq start (point))))))
167 (defun vc-git-dir-state (dir)
168 "Git-specific version of `dir-state'."
169 (vc-git--ls-files-state 'up-to-date "-c")
170 (vc-git--ls-files-state 'edited "-m")
171 (vc-git--ls-files-state 'removed "-d")
172 (vc-git--ls-files-state 'ignored "-o" "-i" "--exclude-standard")
173 (vc-git--ls-files-state nil "-o" "--exclude-standard"))
175 (defun vc-git-working-revision (file)
176 "Git-specific version of `vc-working-revision'."
177 (let ((str (with-output-to-string
178 (with-current-buffer standard-output
179 (vc-git--out-ok "symbolic-ref" "HEAD")))))
180 (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
181 (match-string 2 str)
182 str)))
184 (defun vc-git-checkout-model (file)
185 'implicit)
187 (defun vc-git-workfile-unchanged-p (file)
188 (eq 'up-to-date (vc-git-state file)))
190 (defun vc-git-mode-line-string (file)
191 "Return string for placement into the modeline for FILE."
192 (let* ((branch (vc-git-working-revision file))
193 (def-ml (vc-default-mode-line-string 'Git file))
194 (help-echo (get-text-property 0 'help-echo def-ml)))
195 (if (zerop (length branch))
196 (propertize
197 (concat def-ml "!")
198 'help-echo (concat help-echo "\nNo current branch (detached HEAD)"))
199 (propertize def-ml
200 'help-echo (concat help-echo "\nCurrent branch: " branch)))))
202 (defun vc-git-dired-state-info (file)
203 "Git-specific version of `vc-dired-state-info'."
204 (let ((git-state (vc-state file)))
205 (if (eq git-state 'edited)
206 "(modified)"
207 ;; fall back to the default VC representation
208 (vc-default-dired-state-info 'Git file))))
210 ;;; vc-dir-status support (EXPERIMENTAL)
211 ;;; If vc-directory (which is not half bad under Git, w/ some tweaking)
212 ;;; is to go away, vc-dir-status must at least support the same operations.
213 ;;; At the moment, vc-dir-status design is still fluid (a kind way to say
214 ;;; half-baked, undocumented, and spottily-supported), so the following
215 ;;; should be considered likewise ripe for sudden unannounced change.
216 ;;; YHBW, HAND. --ttn
218 (defun vc-git-after-dir-status (callback buffer)
219 (sort-regexp-fields t "^. \\(.+\\)$" "\\1" (point-min) (point-max))
220 (let ((map '((?H . cached)
221 (?M . unmerged)
222 (?R . removed)
223 (?C . edited)
224 (?K . removed) ; ??? "to be killed"
225 (?? . unregistered)))
226 status filename result)
227 (goto-char (point-min))
228 (while (> (point-max) (point))
229 (setq status (string-to-char (buffer-substring (point) (1+ (point))))
230 status (cdr (assq status map))
231 filename (buffer-substring (+ 2 (point)) (line-end-position)))
232 ;; TODO: Add dynamic selection of which status(es) to display, and
233 ;; bubble that up to vc-dir-status. For now, we consider `cached'
234 ;; to be uninteresting, to mimic vc-directory (somewhat).
235 (unless (eq 'cached status)
236 (push (cons filename status) result))
237 (forward-line 1))
238 (funcall callback result buffer)))
240 (defun vc-git-dir-status (dir update-function status-buffer)
241 "Return a list of conses (file . state) for DIR."
242 (with-current-buffer
243 (get-buffer-create
244 (expand-file-name " *VC-Git* tmp status" dir))
245 (erase-buffer)
246 (vc-git-command (current-buffer) 'async dir "ls-files" "-t"
247 "-c" ; cached
248 "-d" ; deleted
249 "-k" ; killed
250 "-m" ; modified
251 "-o" ; others
252 "--directory"
253 "--exclude-per-directory=.gitignore")
254 (vc-exec-after
255 `(vc-git-after-dir-status (quote ,update-function) ,status-buffer))
256 (current-buffer)))
258 ;;; STATE-CHANGING FUNCTIONS
260 (defun vc-git-create-repo ()
261 "Create a new Git repository."
262 (vc-git-command nil 0 nil "init"))
264 (defun vc-git-register (files &optional rev comment)
265 "Register FILE into the git version-control system."
266 (vc-git-command nil 0 files "update-index" "--add" "--"))
268 (defalias 'vc-git-responsible-p 'vc-git-root)
270 (defun vc-git-unregister (file)
271 (vc-git-command nil 0 file "rm" "-f" "--cached" "--"))
274 (defun vc-git-checkin (files rev comment)
275 (let ((coding-system-for-write git-commits-coding-system))
276 (vc-git-command nil 0 files "commit" "-m" comment "--only" "--")))
278 (defun vc-git-find-revision (file rev buffer)
279 (let ((coding-system-for-read 'binary)
280 (coding-system-for-write 'binary)
281 (fullname (substring
282 (vc-git--run-command-string
283 file "ls-files" "-z" "--full-name" "--")
284 0 -1)))
285 (vc-git-command
286 buffer 0
287 (concat (if rev rev "HEAD") ":" fullname) "cat-file" "blob")))
289 (defun vc-git-checkout (file &optional editable rev)
290 (vc-git-command nil 0 file "checkout" (or rev "HEAD")))
292 (defun vc-git-revert (file &optional contents-done)
293 "Revert FILE to the version stored in the git repository."
294 (if contents-done
295 (vc-git-command nil 0 file "update-index" "--")
296 (vc-git-command nil 0 file "checkout" "HEAD")))
298 ;;; HISTORY FUNCTIONS
300 (defun vc-git-print-log (files &optional buffer)
301 "Get change log associated with FILES."
302 (let ((coding-system-for-read git-commits-coding-system)
303 ;; Support both the old print-log interface that passes a
304 ;; single file, and the new one that passes a file list.
305 (flist (if (listp files) files (list files))))
306 ;; `vc-do-command' creates the buffer, but we need it before running
307 ;; the command.
308 (vc-setup-buffer buffer)
309 ;; If the buffer exists from a previous invocation it might be
310 ;; read-only.
311 (let ((inhibit-read-only t))
312 ;; XXX `log-view-mode' needs to have something to identify where
313 ;; the log for each individual file starts. It seems that by
314 ;; default git does not output this info. So loop here and call
315 ;; "git rev-list" on each file separately to make sure that each
316 ;; file gets a "File:" header before the corresponding
317 ;; log. Maybe there is a way to do this with one command...
318 (dolist (file flist)
319 (with-current-buffer
320 buffer
321 (insert "File: " (file-name-nondirectory file) "\n"))
322 (vc-git-command buffer 'async (file-relative-name file)
323 "rev-list" "--pretty" "HEAD" "--")))))
325 (defvar log-view-message-re)
326 (defvar log-view-file-re)
327 (defvar log-view-font-lock-keywords)
329 (define-derived-mode vc-git-log-view-mode log-view-mode "Git-Log-View"
330 (require 'add-log) ;; we need the faces add-log
331 ;; Don't have file markers, so use impossible regexp.
332 (set (make-local-variable 'log-view-file-re) "^File:[ \t]+\\(.+\\)")
333 (set (make-local-variable 'log-view-message-re)
334 "^commit *\\([0-9a-z]+\\)")
335 (set (make-local-variable 'log-view-font-lock-keywords)
336 (append
337 `((,log-view-message-re (1 'change-log-acknowledgement))
338 (,log-view-file-re (1 'change-log-file-face)))
339 ;; Handle the case:
340 ;; user: foo@bar
341 '(("^Author:[ \t]+\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)"
342 (1 'change-log-email))
343 ;; Handle the case:
344 ;; user: FirstName LastName <foo@bar>
345 ("^Author:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
346 (1 'change-log-name)
347 (2 'change-log-email))
348 ("^ +\\(?:\\(?:[Aa]cked\\|[Ss]igned-[Oo]ff\\)-[Bb]y:\\)[ \t]+\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)"
349 (1 'change-log-name))
350 ("^ +\\(?:\\(?:[Aa]cked\\|[Ss]igned-[Oo]ff\\)-[Bb]y:\\)[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
351 (1 'change-log-name)
352 (2 'change-log-email))
353 ("^Merge: \\([0-9a-z]+\\) \\([0-9a-z]+\\)"
354 (1 'change-log-acknowledgement)
355 (2 'change-log-acknowledgement))
356 ("^Date: \\(.+\\)" (1 'change-log-date))
357 ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message))))))
359 (defun vc-git-show-log-entry (revision)
360 "Move to the log entry for REVISION.
361 REVISION may have the form BRANCH, BRANCH~N,
362 or BRANCH^ (where \"^\" can be repeated)."
363 (goto-char (point-min))
364 (search-forward "\ncommit" nil t
365 (cond ((string-match "~\\([0-9]\\)$" revision)
366 (1+ (string-to-number (match-string 1 revision))))
367 ((string-match "\\^+$" revision)
368 (1+ (length (match-string 0 revision))))
369 (t nil)))
370 (beginning-of-line))
372 (defun vc-git-diff (files &optional rev1 rev2 buffer)
373 (let ((buf (or buffer "*vc-diff*")))
374 (if (and rev1 rev2)
375 (vc-git-command buf 1 files "diff-tree" "--exit-code" "-p"
376 rev1 rev2 "--")
377 (vc-git-command buf 1 files "diff-index" "--exit-code" "-p"
378 (or rev1 "HEAD") "--"))))
380 (defun vc-git-revision-table (files)
381 ;; What about `files'?!? --Stef
382 (let ((table (list "HEAD")))
383 (with-temp-buffer
384 (vc-git-command t nil nil "for-each-ref" "--format=%(refname)")
385 (goto-char (point-min))
386 (while (re-search-forward "^refs/\\(heads\\|tags\\)/\\(.*\\)$" nil t)
387 (push (match-string 2) table)))
388 table))
390 (defun vc-git-revision-completion-table (files)
391 (lexical-let ((files files)
392 table)
393 (setq table (lazy-completion-table
394 table (lambda () (vc-git-revision-table files))))
395 table))
397 (defun vc-git-annotate-command (file buf &optional rev)
398 ;; FIXME: rev is ignored
399 (let ((name (file-relative-name file)))
400 (vc-git-command buf 0 name "blame" (if rev (concat "-r" rev)))))
402 (defun vc-git-annotate-time ()
403 (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)
404 (vc-annotate-convert-time
405 (apply #'encode-time (mapcar (lambda (match)
406 (string-to-number (match-string match)))
407 '(6 5 4 3 2 1 7))))))
409 (defun vc-git-annotate-extract-revision-at-line ()
410 (save-excursion
411 (move-beginning-of-line 1)
412 (and (looking-at "[0-9a-f]+")
413 (buffer-substring-no-properties (match-beginning 0) (match-end 0)))))
415 ;;; SNAPSHOT SYSTEM
417 (defun vc-git-create-snapshot (dir name branchp)
418 (let ((default-directory dir))
419 (and (vc-git-command nil 0 nil "update-index" "--refresh")
420 (if branchp
421 (vc-git-command nil 0 nil "checkout" "-b" name)
422 (vc-git-command nil 0 nil "tag" name)))))
424 (defun vc-git-retrieve-snapshot (dir name update)
425 (let ((default-directory dir))
426 (vc-git-command nil 0 nil "checkout" name)
427 ;; FIXME: update buffers if `update' is true
431 ;;; MISCELLANEOUS
433 (defun vc-git-previous-revision (file rev)
434 "Git-specific version of `vc-previous-revision'."
435 (let ((default-directory (file-name-directory (expand-file-name file)))
436 (file (file-name-nondirectory file)))
437 (vc-git-symbolic-commit
438 (with-temp-buffer
439 (and
440 (vc-git--out-ok "rev-list" "-2" rev "--" file)
441 (goto-char (point-max))
442 (bolp)
443 (zerop (forward-line -1))
444 (not (bobp))
445 (buffer-substring-no-properties
446 (point)
447 (1- (point-max))))))))
449 (defun vc-git-next-revision (file rev)
450 "Git-specific version of `vc-next-revision'."
451 (let* ((default-directory (file-name-directory
452 (expand-file-name file)))
453 (file (file-name-nondirectory file))
454 (current-rev
455 (with-temp-buffer
456 (and
457 (vc-git--out-ok "rev-list" "-1" rev "--" file)
458 (goto-char (point-max))
459 (bolp)
460 (zerop (forward-line -1))
461 (bobp)
462 (buffer-substring-no-properties
463 (point)
464 (1- (point-max)))))))
465 (and current-rev
466 (vc-git-symbolic-commit
467 (with-temp-buffer
468 (and
469 (vc-git--out-ok "rev-list" "HEAD" "--" file)
470 (goto-char (point-min))
471 (search-forward current-rev nil t)
472 (zerop (forward-line -1))
473 (buffer-substring-no-properties
474 (point)
475 (progn (forward-line 1) (1- (point))))))))))
477 (defun vc-git-delete-file (file)
478 (vc-git-command nil 0 file "rm" "-f" "--"))
480 (defun vc-git-rename-file (old new)
481 (vc-git-command nil 0 (list old new) "mv" "-f" "--"))
484 ;;; Internal commands
486 (defun vc-git-root (file)
487 (vc-find-root file ".git"))
489 (defun vc-git-command (buffer okstatus file-or-list &rest flags)
490 "A wrapper around `vc-do-command' for use in vc-git.el.
491 The difference to vc-do-command is that this function always invokes `git'."
492 (apply 'vc-do-command buffer okstatus "git" file-or-list flags))
494 (defun vc-git--call (buffer command &rest args)
495 ;; We don't need to care the arguments. If there is a file name, it
496 ;; is always a relative one. This works also for remote
497 ;; directories.
498 (apply 'process-file "git" nil buffer nil command args))
500 (defun vc-git--out-ok (command &rest args)
501 (zerop (apply 'vc-git--call '(t nil) command args)))
503 (defun vc-git--run-command-string (file &rest args)
504 "Run a git command on FILE and return its output as string."
505 (let* ((ok t)
506 (str (with-output-to-string
507 (with-current-buffer standard-output
508 (unless (apply 'vc-git--out-ok
509 (append args (list (file-relative-name
510 file))))
511 (setq ok nil))))))
512 (and ok str)))
514 (defun vc-git-symbolic-commit (commit)
515 "Translate COMMIT string into symbolic form.
516 Returns nil if not possible."
517 (and commit
518 (with-temp-buffer
519 (and
520 (vc-git--out-ok "name-rev" "--name-only" "--tags" commit)
521 (goto-char (point-min))
522 (= (forward-line 2) 1)
523 (bolp)
524 (buffer-substring-no-properties (point-min) (1- (point-max)))))))
526 (provide 'vc-git)
528 ;; arch-tag: bd10664a-0e5b-48f5-a877-6c17b135be12
529 ;;; vc-git.el ends here