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[Emacs-diffs] Changes to vc-git.el


From: Dan Nicolaescu
Subject: [Emacs-diffs] Changes to vc-git.el
Date: Sun, 22 Jul 2007 19:46:07 +0000

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Dan Nicolaescu <dann>   07/07/22 19:46:06

Index: vc-git.el
===================================================================
RCS file: vc-git.el
diff -N vc-git.el
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ vc-git.el   22 Jul 2007 19:46:04 -0000      1.1
@@ -0,0 +1,227 @@
+;;; vc-git.el --- VC backend for the git version control system
+
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+;; Author: Alexandre Julliard
+;; 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 2, 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:
+;;  - 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-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-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-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-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-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-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)))))
+
+(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))))))))))
+
+
+;; Internal commands
+
+(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-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)




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