mirror of
https://github.com/git/git.git
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248c648a0d
This is necessary to make several editing functions work, like C-u C-x v = Signed-off-by: David Kastrup <dak@gnu.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
216 lines
7.8 KiB
EmacsLisp
216 lines
7.8 KiB
EmacsLisp
;;; vc-git.el --- VC backend for the git version control system
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;; Copyright (C) 2006 Alexandre Julliard
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2 of
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;; the License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be
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;; useful, but WITHOUT ANY WARRANTY; without even the implied
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;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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;; PURPOSE. See the GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public
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;; License along with this program; if not, write to the Free
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;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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;; MA 02111-1307 USA
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;;; Commentary:
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;; This file contains a VC backend for the git version control
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;; system.
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;;
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;; To install: put this file on the load-path and add GIT to the list
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;; of supported backends in `vc-handled-backends'; the following line,
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;; placed in your ~/.emacs, will accomplish this:
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;;
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;; (add-to-list 'vc-handled-backends 'GIT)
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;;
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;; TODO
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;; - changelog generation
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;; - working with revisions other than HEAD
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;;
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(eval-when-compile (require 'cl))
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(defvar git-commits-coding-system 'utf-8
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"Default coding system for git commits.")
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(defun vc-git--run-command-string (file &rest args)
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"Run a git command on FILE and return its output as string."
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(let* ((ok t)
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(str (with-output-to-string
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(with-current-buffer standard-output
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(unless (eq 0 (apply #'call-process "git" nil '(t nil) nil
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(append args (list (file-relative-name file)))))
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(setq ok nil))))))
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(and ok str)))
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(defun vc-git--run-command (file &rest args)
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"Run a git command on FILE, discarding any output."
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(let ((name (file-relative-name file)))
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(eq 0 (apply #'call-process "git" nil (get-buffer "*Messages") nil (append args (list name))))))
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(defun vc-git-registered (file)
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"Check whether FILE is registered with git."
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(with-temp-buffer
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(let* ((dir (file-name-directory file))
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(name (file-relative-name file dir)))
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(and (ignore-errors
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(when dir (cd dir))
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(eq 0 (call-process "git" nil '(t nil) nil "ls-files" "-c" "-z" "--" name)))
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(let ((str (buffer-string)))
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(and (> (length str) (length name))
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(string= (substring str 0 (1+ (length name))) (concat name "\0"))))))))
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(defun vc-git-state (file)
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"git-specific version of `vc-state'."
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(let ((diff (vc-git--run-command-string file "diff-index" "-z" "HEAD" "--")))
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(if (and diff (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} [ADMU]\0[^\0]+\0" diff))
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'edited
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'up-to-date)))
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(defun vc-git-workfile-version (file)
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"git-specific version of `vc-workfile-version'."
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(let ((str (with-output-to-string
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(with-current-buffer standard-output
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(call-process "git" nil '(t nil) nil "symbolic-ref" "HEAD")))))
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(if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
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(match-string 2 str)
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str)))
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(defun vc-git-symbolic-commit (commit)
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"Translate COMMIT string into symbolic form.
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Returns nil if not possible."
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(and commit
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(with-temp-buffer
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(and
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(zerop
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(call-process "git" nil '(t nil) nil "name-rev"
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"--name-only" "--tags"
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commit))
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(goto-char (point-min))
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(= (forward-line 2) 1)
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(bolp)
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(buffer-substring-no-properties (point-min) (1- (point-max)))))))
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(defun vc-git-previous-version (file rev)
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"git-specific version of `vc-previous-version'."
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(let ((default-directory (file-name-directory (expand-file-name file)))
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(file (file-name-nondirectory file)))
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(vc-git-symbolic-commit
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(with-temp-buffer
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(and
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(zerop
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(call-process "git" nil '(t nil) nil "rev-list"
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"-2" rev "--" file))
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(goto-char (point-max))
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(bolp)
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(zerop (forward-line -1))
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(not (bobp))
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(buffer-substring-no-properties
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(point)
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(1- (point-max))))))))
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(defun vc-git-next-version (file rev)
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"git-specific version of `vc-next-version'."
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(let* ((default-directory (file-name-directory
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(expand-file-name file)))
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(file (file-name-nondirectory file))
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(current-rev
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(with-temp-buffer
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(and
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(zerop
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(call-process "git" nil '(t nil) nil "rev-list"
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"-1" rev "--" file))
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(goto-char (point-max))
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(bolp)
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(zerop (forward-line -1))
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(bobp)
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(buffer-substring-no-properties
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(point)
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(1- (point-max)))))))
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(and current-rev
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(vc-git-symbolic-commit
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(with-temp-buffer
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(and
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(zerop
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(call-process "git" nil '(t nil) nil "rev-list"
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"HEAD" "--" file))
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(goto-char (point-min))
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(search-forward current-rev nil t)
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(zerop (forward-line -1))
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(buffer-substring-no-properties
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(point)
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(progn (forward-line 1) (1- (point))))))))))
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(defun vc-git-revert (file &optional contents-done)
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"Revert FILE to the version stored in the git repository."
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(if contents-done
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(vc-git--run-command file "update-index" "--")
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(vc-git--run-command file "checkout" "HEAD")))
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(defun vc-git-checkout-model (file)
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'implicit)
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(defun vc-git-workfile-unchanged-p (file)
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(let ((sha1 (vc-git--run-command-string file "hash-object" "--"))
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(head (vc-git--run-command-string file "ls-tree" "-z" "HEAD" "--")))
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(and head
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(string-match "[0-7]\\{6\\} blob \\([0-9a-f]\\{40\\}\\)\t[^\0]+\0" head)
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(string= (car (split-string sha1 "\n")) (match-string 1 head)))))
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(defun vc-git-register (file &optional rev comment)
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"Register FILE into the git version-control system."
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(vc-git--run-command file "update-index" "--add" "--"))
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(defun vc-git-print-log (file &optional buffer)
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(let ((name (file-relative-name file))
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(coding-system-for-read git-commits-coding-system))
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(vc-do-command buffer 'async "git" name "rev-list" "--pretty" "HEAD" "--")))
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(defun vc-git-diff (file &optional rev1 rev2 buffer)
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(let ((name (file-relative-name file))
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(buf (or buffer "*vc-diff*")))
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(if (and rev1 rev2)
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(vc-do-command buf 0 "git" name "diff-tree" "-p" rev1 rev2 "--")
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(vc-do-command buf 0 "git" name "diff-index" "-p" (or rev1 "HEAD") "--"))
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; git-diff-index doesn't set exit status like diff does
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(if (vc-git-workfile-unchanged-p file) 0 1)))
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(defun vc-git-checkin (file rev comment)
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(let ((coding-system-for-write git-commits-coding-system))
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(vc-git--run-command file "commit" "-m" comment "--only" "--")))
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(defun vc-git-checkout (file &optional editable rev destfile)
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(if destfile
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(let ((fullname (substring
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(vc-git--run-command-string file "ls-files" "-z" "--full-name" "--")
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0 -1))
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(coding-system-for-read 'no-conversion)
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(coding-system-for-write 'no-conversion))
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(with-temp-file destfile
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(eq 0 (call-process "git" nil t nil "cat-file" "blob"
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(concat (or rev "HEAD") ":" fullname)))))
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(vc-git--run-command file "checkout" (or rev "HEAD"))))
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(defun vc-git-annotate-command (file buf &optional rev)
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; FIXME: rev is ignored
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(let ((name (file-relative-name file)))
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(call-process "git" nil buf nil "blame" name)))
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(defun vc-git-annotate-time ()
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(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)
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(vc-annotate-convert-time
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(apply #'encode-time (mapcar (lambda (match) (string-to-number (match-string match))) '(6 5 4 3 2 1 7))))))
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;; Not really useful since we can't do anything with the revision yet
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;;(defun vc-annotate-extract-revision-at-line ()
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;; (save-excursion
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;; (move-beginning-of-line 1)
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;; (and (looking-at "[0-9a-f]+")
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;; (buffer-substring (match-beginning 0) (match-end 0)))))
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(provide 'vc-git)
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