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+;;; vc-git.el --- VC backend for the git version control system
+
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+;; Author: Alexandre Julliard <julliard@winehq.org>
+;; Keywords: tools
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 3, or (at your option)
+;; any later version.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; This file contains a VC backend for the git version control
+;; system.
+;;
+
+;;; Installation:
+
+;; 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:
+;;  - check if more functions could use vc-git-command instead
+;;     of start-process.
+;;  - changelog generation
+
+;; Implement the rest of the vc interface. See the comment at the
+;; beginning of vc.el. The current status is:
+;; ("??" means: "figure out what to do about it")
+;;
+;; FUNCTION NAME                                   STATUS
+;; BACKEND PROPERTIES
+;; * revision-granularity                          OK
+;; STATE-QUERYING FUNCTIONS
+;; * registered (file)				   OK
+;; * state (file)				   OK
+;; - state-heuristic (file)			   NOT NEEDED
+;; - dir-state (dir)				   OK
+;; * workfile-version (file)			   OK
+;; - latest-on-branch-p (file)			   NOT NEEDED
+;; * checkout-model (file)			   OK
+;; - workfile-unchanged-p (file)		   OK
+;; - mode-line-string (file)			   NOT NEEDED
+;; - dired-state-info (file)			   OK
+;; STATE-CHANGING FUNCTIONS
+;; * create-repo ()				   OK
+;; * register (files &optional rev comment)	   OK
+;; - init-version (file)			   NOT NEEDED
+;; - responsible-p (file)			   OK
+;; - could-register (file)			   NOT NEEDED, DEFAULT IS GOOD
+;; - receive-file (file rev)			   NOT NEEDED
+;; - unregister (file)				   OK
+;; * checkin (files rev comment)		   OK
+;; * find-version (file rev buffer)		   OK
+;; * checkout (file &optional editable rev)	   OK
+;; * revert (file &optional contents-done)	   OK
+;; - rollback (files)				   COULD BE SUPPORTED
+;; - merge (file rev1 rev2)			   It would be possible to merge changes into
+;;                                                 a single file, but when committing they
+;;                                                 wouldn't be identified as a merge by git,
+;;                                                 so it's probably not a good idea.
+;; - merge-news (file)				   see `merge'
+;; - steal-lock (file &optional version)	   NOT NEEDED
+;; HISTORY FUNCTIONS
+;; * print-log (files &optional buffer)		   OK
+;; - log-view-mode ()				   OK
+;; - show-log-entry (version)			   NOT NEEDED, DEFAULT IS GOOD
+;; - wash-log (file)				   COULD BE SUPPORTED
+;; - logentry-check ()				   NOT NEEDED
+;; - comment-history (file)			   ??
+;; - update-changelog (files)			   COULD BE SUPPORTED
+;; * diff (file &optional rev1 rev2 buffer)	   OK
+;; - revision-completion-table (file)		   NOT SUPPORTED in emacs-22.x
+;; - diff-tree (dir &optional rev1 rev2)	   OK
+;; - annotate-command (file buf &optional rev)	   OK
+;; - annotate-time ()				   OK
+;; - annotate-current-time ()			   NOT NEEDED
+;; - annotate-extract-revision-at-line ()	   OK
+;; SNAPSHOT SYSTEM
+;; - create-snapshot (dir name branchp)		   OK
+;; - assign-name (file name)			   NOT NEEDED
+;; - retrieve-snapshot (dir name update)	   OK, needs to update buffers
+;; MISCELLANEOUS
+;; - make-version-backups-p (file)		   NOT NEEDED
+;; - repository-hostname (dirname)		   NOT NEEDED
+;; - previous-version (file rev)		   OK
+;; - next-version (file rev)			   OK
+;; - check-headers ()				   COULD BE SUPPORTED
+;; - clear-headers ()				   NOT NEEDED
+;; - delete-file (file)				   OK
+;; - rename-file (old new)			   OK
+;; - find-file-hook ()				   NOT NEEDED
+;; - find-file-not-found-hook ()                   NOT NEEDED
+
+(eval-when-compile (require 'cl) (require 'vc))
+
+(defvar git-commits-coding-system 'utf-8
+  "Default coding system for git commits.")
+
+;;; BACKEND PROPERTIES
+
+(defun vc-git-revision-granularity ()
+     'repository)
+
+;;; STATE-QUERYING FUNCTIONS
+
+;;;###autoload (defun vc-git-registered (file)
+;;;###autoload   "Return non-nil if FILE is registered with git."
+;;;###autoload   (if (vc-find-root file ".git")       ; short cut
+;;;###autoload       (progn
+;;;###autoload         (load "vc-git")
+;;;###autoload         (vc-git-registered file))))
+
+(defun vc-git-registered (file)
+  "Check whether FILE is registered with git."
+  (when (vc-git-root file)
+    (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-dir-state (dir)
+  (with-temp-buffer
+    (vc-git-command (current-buffer) nil nil "ls-files" "-t")
+    (goto-char (point-min))
+    (let ((status-char nil)
+	  (file nil))
+      (while (not (eobp))
+	(setq status-char (char-after))
+	(setq file
+	      (expand-file-name
+	       (buffer-substring-no-properties (+ (point) 2) (line-end-position))))
+	(cond
+	 ;; The rest of the possible states in "git ls-files -t" output:
+         ;;      R              removed/deleted
+	 ;;      K              to be killed
+	 ;; should not show up in vc-dired, so don't deal with them
+	 ;; here.
+	 ((eq status-char ?H)
+	  (vc-file-setprop file 'vc-state 'up-to-date))
+	 ((eq status-char ?M)
+	  (vc-file-setprop file 'vc-state 'edited))
+	 ((eq status-char ?C)
+	  (vc-file-setprop file 'vc-state 'edited))
+	 ((eq status-char ??)
+	  (vc-file-setprop file 'vc-backend 'none)
+	  (vc-file-setprop file 'vc-state 'nil)))
+	(forward-line)))))
+
+(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-checkout-model (file)
+  'implicit)
+
+(defun vc-git-workfile-unchanged-p (file)
+  ;; The reason this does not use the result of vc-git-state is that
+  ;; git-diff-index (used by vc-git-state) doesn't refresh the cached
+  ;; stat info, so if the file has been modified it will always show
+  ;; up as modified in vc-git-state, even if the change has been
+  ;; undone, until git-update-index --refresh is run.
+
+  ;; OTOH the vc-git-workfile-unchanged-p implementation checks the
+  ;; actual content, so it will detect the case of a file reverted
+  ;; back to its original state.
+
+  ;; The ideal implementation would be to refresh the stat cache and
+  ;; then call vc-git-state, but at the moment there's no git command
+  ;; to refresh a single file, so this will have to be added first.
+  (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-dired-state-info (file)
+  "Git-specific version of `vc-dired-state-info'."
+  (let ((git-state (vc-state file)))
+    (if (eq git-state 'edited)
+	"(modified)"
+      ;; fall back to the default VC representation
+      (vc-default-dired-state-info 'GIT file))))
+
+;;; STATE-CHANGING FUNCTIONS
+
+(defun vc-git-create-repo ()
+  "Create a new GIT repository."
+  (vc-git-command "init" nil 0 nil))
+
+(defun vc-git-register (files &optional rev comment)
+  "Register FILE into the git version-control system."
+  (vc-git-command nil 0 files "update-index" "--add" "--"))
+
+(defalias 'vc-git-responsible-p 'vc-git-root)
+
+(defun vc-git-unregister (file)
+  (vc-git-command nil 0 file "rm" "-f" "--cached" "--"))
+
+
+(defun vc-git-checkin (files rev comment)
+  (let ((coding-system-for-write git-commits-coding-system))
+    (vc-git-command nil 0 files "commit" "-m" comment "--only" "--")))
+
+(defun vc-git-find-version (file rev buffer)
+  (let ((coding-system-for-read 'binary)
+        (coding-system-for-write 'binary)
+	(fullname (substring
+		   (vc-git--run-command-string
+		    file "ls-files" "-z" "--full-name" "--")
+		   0 -1)))
+    (vc-git-command
+     buffer 0
+     (concat (if rev rev "HEAD") ":" fullname) "cat-file" "blob")))
+
+(defun vc-git-checkout (file &optional editable rev)
+  (vc-git-command nil 0 file "checkout" (or rev "HEAD")))
+
+(defun vc-git-revert (file &optional contents-done)
+  "Revert FILE to the version stored in the git repository."
+  (if contents-done
+      (vc-git-command nil 0 file "update-index" "--")
+    (vc-git-command nil 0 file "checkout" "HEAD")))
+
+;;; HISTORY FUNCTIONS
+
+(defun vc-git-print-log (files &optional buffer)
+  "Get change log associated with FILES."
+  (let ((coding-system-for-read git-commits-coding-system)
+	;; Support both the old print-log interface that passes a
+	;; single file, and the new one that passes a file list.
+	(flist (if (listp files) files (list files))))
+    ;; `vc-do-command' creates the buffer, but we need it before running
+    ;; the command.
+    (vc-setup-buffer buffer)
+    ;; If the buffer exists from a previous invocation it might be
+    ;; read-only.
+    (let ((inhibit-read-only t))
+      ;; XXX `log-view-mode' needs to have something to identify where
+      ;; the log for each individual file starts. It seems that by
+      ;; default git does not output this info. So loop here and call
+      ;; "git rev-list" on each file separately to make sure that each
+      ;; file gets a "File:" header before the corresponding
+      ;; log. Maybe there is a way to do this with one command...
+      (dolist (file flist)
+	(with-current-buffer
+	    buffer
+	  (insert "File: " (file-name-nondirectory file) "\n"))
+	(vc-git-command buffer 'async (file-relative-name file)
+			"rev-list" "--pretty" "HEAD" "--")))))
+
+(defvar log-view-message-re)
+(defvar log-view-file-re)
+(defvar log-view-font-lock-keywords)
+
+(define-derived-mode vc-git-log-view-mode log-view-mode "GIT-Log-View"
+  (require 'add-log) ;; we need the faces add-log
+  ;; Don't have file markers, so use impossible regexp.
+  (set (make-local-variable 'log-view-file-re) "^File:[ \t]+\\(.+\\)")
+  (set (make-local-variable 'log-view-message-re)
+       "^commit *\\([0-9a-z]+\\)")
+  (set (make-local-variable 'log-view-font-lock-keywords)
+       (append
+       `((,log-view-message-re  (1 'change-log-acknowledgement))
+         (,log-view-file-re (1 'change-log-file-face)))
+         ;; Handle the case:
+         ;; user: foo@bar
+         '(("^Author:[ \t]+\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)"
+            (1 'change-log-email))
+	   ;; Handle the case:
+	   ;; user: FirstName LastName <foo@bar>
+	   ("^Author:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
+	    (1 'change-log-name)
+	    (2 'change-log-email))
+	   ("^Date:   \\(.+\\)" (1 'change-log-date))
+	   ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message))))))
+
+(defun vc-git-diff (files &optional rev1 rev2 buffer)
+  (let ((buf (or buffer "*vc-diff*")))
+    (if (and rev1 rev2)
+        (vc-git-command buf 1 files "diff-tree" "--exit-code" "-p" rev1 rev2 "--")
+      (vc-git-command buf 1 files "diff-index" "--exit-code" "-p" (or rev1 "HEAD") "--"))))
+
+(defun vc-git-revision-table (file)
+  (let ((table (list "HEAD")))
+    (with-temp-buffer
+      (vc-git-command t nil nil "for-each-ref" "--format=%(refname)")
+      (goto-char (point-min))
+      (while (re-search-forward "^refs/\\(heads\\|tags\\)/\\(.*\\)$" nil t)
+        (push (match-string 2) table)))
+    table))
+
+;; Commented out on the 22.x branch, VC here does not support it yet
+;; and when bytecompiling it max-specpdl-size is exceeded.
+;; (defun vc-git-revision-completion-table (file)
+;;   (lexical-let ((file file)
+;;                 table)
+;;     (setq table (lazy-completion-table
+;;                  table (lambda () (vc-git-revision-table file))))
+;;     table))
+
+(defun vc-git-diff-tree (dir &optional rev1 rev2)
+  (vc-git-diff dir rev1 rev2))
+
+(defun vc-git-annotate-command (file buf &optional rev)
+  ;; FIXME: rev is ignored
+  (let ((name (file-relative-name file)))
+    (vc-git-command buf 0 name "blame" (if rev (concat "-r" rev)))))
+
+(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))))))
+
+(defun vc-git-annotate-extract-revision-at-line ()
+ (save-excursion
+   (move-beginning-of-line 1)
+   (and (looking-at "[0-9a-f]+")
+        (buffer-substring-no-properties (match-beginning 0) (match-end 0)))))
+
+;;; SNAPSHOT SYSTEM
+
+(defun vc-git-create-snapshot (dir name branchp)
+  (let ((default-directory dir))
+    (and (vc-git-command nil 0 nil "update-index" "--refresh")
+         (if branchp
+             (vc-git-command nil 0 nil "checkout" "-b" name)
+           (vc-git-command nil 0 nil "tag" name)))))
+
+(defun vc-git-retrieve-snapshot (dir name update)
+  (let ((default-directory dir))
+    (vc-git-command nil 0 nil "checkout" name)
+    ;; FIXME: update buffers if `update' is true
+    ))
+
+
+;;; MISCELLANEOUS
+
+(defun vc-git-previous-version (file rev)
+  "Git-specific version of `vc-previous-version'."
+  (let ((default-directory (file-name-directory (expand-file-name file)))
+	(file (file-name-nondirectory file)))
+    (vc-git-symbolic-commit
+     (with-temp-buffer
+       (and
+	(zerop
+	 (call-process "git" nil '(t nil) nil "rev-list"
+		       "-2" rev "--" file))
+	(goto-char (point-max))
+	(bolp)
+	(zerop (forward-line -1))
+	(not (bobp))
+	(buffer-substring-no-properties
+	   (point)
+	   (1- (point-max))))))))
+
+(defun vc-git-next-version (file rev)
+  "Git-specific version of `vc-next-version'."
+  (let* ((default-directory (file-name-directory
+			     (expand-file-name file)))
+	(file (file-name-nondirectory file))
+	(current-rev
+	 (with-temp-buffer
+	   (and
+	    (zerop
+	     (call-process "git" nil '(t nil) nil "rev-list"
+			   "-1" rev "--" file))
+	    (goto-char (point-max))
+	    (bolp)
+	    (zerop (forward-line -1))
+	    (bobp)
+	    (buffer-substring-no-properties
+	     (point)
+	     (1- (point-max)))))))
+    (and current-rev
+	 (vc-git-symbolic-commit
+	  (with-temp-buffer
+	    (and
+	     (zerop
+	      (call-process "git" nil '(t nil) nil "rev-list"
+			    "HEAD" "--" file))
+	     (goto-char (point-min))
+	     (search-forward current-rev nil t)
+	     (zerop (forward-line -1))
+	     (buffer-substring-no-properties
+	      (point)
+	      (progn (forward-line 1) (1- (point))))))))))
+
+(defun vc-git-delete-file (file)
+  (vc-git-command nil 0 file "rm" "-f" "--"))
+
+(defun vc-git-rename-file (old new)
+  (vc-git-command nil 0 (list old new) "mv" "-f" "--"))
+
+
+;;; Internal commands
+
+(defun vc-git-root (file)
+  (vc-find-root file ".git"))
+
+(defun vc-git-command (buffer okstatus file-or-list &rest flags)
+  "A wrapper around `vc-do-command' for use in vc-git.el.
+The difference to vc-do-command is that this function always invokes `git'."
+  (apply 'vc-do-command buffer okstatus "git" file-or-list flags))
+
+(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-symbolic-commit (commit)
+  "Translate COMMIT string into symbolic form.
+Returns nil if not possible."
+  (and commit
+       (with-temp-buffer
+	 (and
+	  (zerop
+	   (call-process "git" nil '(t nil) nil "name-rev"
+			 "--name-only" "--tags"
+			 commit))
+	  (goto-char (point-min))
+	  (= (forward-line 2) 1)
+	  (bolp)
+	  (buffer-substring-no-properties (point-min) (1- (point-max)))))))
+
+(provide 'vc-git)
+
+;; arch-tag: bd10664a-0e5b-48f5-a877-6c17b135be12
+;;; vc-git.el ends here