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85 lines
3.1 KiB
EmacsLisp
85 lines
3.1 KiB
EmacsLisp
;;; vc-filewise.el --- common functions for file-oriented back ends.
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;; Copyright (C) 1992-1996, 1998-2019 Free Software Foundation, Inc.
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;; Author: FSF (see vc.el for full credits)
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;; Maintainer: emacs-devel@gnu.org
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;; Package: vc
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Common functions for file-oriented back ends - SCCS, RCS, SRC, CVS
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;;
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;; The main purpose of this file is so none of this code has to live
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;; in the always-resident vc-hooks. A secondary purpose is to remove
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;; code specific to this class of back ends from vc.el.
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;;; Code:
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(eval-when-compile (require 'vc))
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(defun vc-master-name (file)
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"Return the master name of FILE.
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If the file is not registered, or the master name is not known, return nil."
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(or (vc-file-getprop file 'vc-name)
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;; force computation of the property by calling
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;; vc-BACKEND-registered explicitly
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(let ((backend (vc-backend file)))
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(if (and backend
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(vc-filewise-registered backend file))
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(vc-file-getprop file 'vc-name)))))
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(defun vc-rename-master (oldmaster newfile templates)
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"Rename OLDMASTER to be the master file for NEWFILE based on TEMPLATES."
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(let* ((dir (file-name-directory (expand-file-name oldmaster)))
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(newdir (or (file-name-directory newfile) ""))
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(newbase (file-name-nondirectory newfile))
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(masters
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;; List of potential master files for `newfile'
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(mapcar
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(lambda (s) (vc-possible-master s newdir newbase))
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templates)))
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(when (or (file-symlink-p oldmaster)
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(file-symlink-p (file-name-directory oldmaster)))
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(error "This is unsafe in the presence of symbolic links"))
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(rename-file
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oldmaster
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(catch 'found
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;; If possible, keep the master file in the same directory.
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(dolist (f masters)
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(when (and f (string= (file-name-directory (expand-file-name f)) dir))
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(throw 'found f)))
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;; If not, just use the first possible place.
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(dolist (f masters)
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(and f (or (not (setq dir (file-name-directory f)))
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(file-directory-p dir))
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(throw 'found f)))
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(error "New file lacks a version control directory")))))
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(defun vc-filewise-registered (backend file)
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"Check if FILE is registered in BACKEND using vc-BACKEND-master-templates."
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(let ((sym (vc-make-backend-sym backend 'master-templates)))
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(unless (get backend 'vc-templates-grabbed)
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(put backend 'vc-templates-grabbed t))
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(let ((result (vc-check-master-templates file (symbol-value sym))))
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(if (stringp result)
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(vc-file-setprop file 'vc-name result)
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nil)))) ; Not registered
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(provide 'vc-filewise)
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