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;;; vc-filewise.el --- common functions for file-oriented back ends.
;; Copyright (C) 1992-1996, 1998-2021 Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: emacs-devel@gnu.org
;; Package: vc
;; 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 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Common functions for file-oriented back ends - SCCS, RCS, SRC, CVS
;;
;; The main purpose of this file is so none of this code has to live
;; in the always-resident vc-hooks. A secondary purpose is to remove
;; code specific to this class of back ends from vc.el.
;;; Code:
(eval-when-compile (require 'vc))
(defun vc-master-name (file)
"Return the master name of FILE.
If the file is not registered, or the master name is not known, return nil."
(or (vc-file-getprop file 'vc-name)
;; force computation of the property by calling
;; vc-BACKEND-registered explicitly
(let ((backend (vc-backend file)))
(if (and backend
(vc-filewise-registered backend file))
(vc-file-getprop file 'vc-name)))))
(defun vc-rename-master (oldmaster newfile templates)
"Rename OLDMASTER to be the master file for NEWFILE based on TEMPLATES."
(let* ((dir (file-name-directory (expand-file-name oldmaster)))
(newdir (or (file-name-directory newfile) ""))
(newbase (file-name-nondirectory newfile))
(masters
;; List of potential master files for `newfile'
(mapcar
(lambda (s) (vc-possible-master s newdir newbase))
templates)))
(when (or (file-symlink-p oldmaster)
(file-symlink-p (file-name-directory oldmaster)))
(error "This is unsafe in the presence of symbolic links"))
(rename-file
oldmaster
(catch 'found
;; If possible, keep the master file in the same directory.
(dolist (f masters)
(when (and f (string= (file-name-directory (expand-file-name f)) dir))
(throw 'found f)))
;; If not, just use the first possible place.
(dolist (f masters)
(and f (or (not (setq dir (file-name-directory f)))
(file-directory-p dir))
(throw 'found f)))
(error "New file lacks a version control directory")))))
(defun vc-filewise-registered (backend file)
"Check if FILE is registered in BACKEND using vc-BACKEND-master-templates."
(let ((sym (vc-make-backend-sym backend 'master-templates)))
(unless (get backend 'vc-templates-grabbed)
(put backend 'vc-templates-grabbed t))
(let ((result (vc-check-master-templates file (symbol-value sym))))
(if (stringp result)
(vc-file-setprop file 'vc-name result)
nil)))) ; Not registered
(provide 'vc-filewise)
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