68 lines
2.6 KiB
EmacsLisp
68 lines
2.6 KiB
EmacsLisp
;;; sync-file.el --- a viewing mode for books and novels. -*- lexical-binding: t; -*-
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;; Copyright (C) 2019 Robert Rose
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;; Author: Robert Rose <overclucker@gmail.com>
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;; Keywords: lisp sync file
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;; Version: 0.0.1
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;; Package-Requires ((emacs "24"))
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;; This program 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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;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Allows you to syncronize files by newest file date. Directories arent currently handled,
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;; as I have no need for that functionaliity at this point. Parent directories will always
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;; be created if they dont exist. Some conditions that may occur haven't been covered, such
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;; as write permissions and attributes. If one of the files is a regular file and the other
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;; is a directory, strange behaviours may occur. Another thing to note is that file names
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;; can make use of TRAMP, which makes remote sync and root file access possible.
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;; e.g.,
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;; (let ((files
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;; '(("~/foo/file1.txt" . "/ssh:use@host:~/foo/file1.txt")
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;; ("~/foo/file2.txt" . "/ssh:use@host:~/foo/file2.txt")
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;; ("~/foo/file3.txt" . "/ssh:use@host:~/foo/file3.txt")) ))
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;; (sync-files files))
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;;; Code:
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(defun copy-file-make-parents (name newname)
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"Copy file and make parent directories if neccessary."
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(let* ((parent (file-name-directory (file-name-directory newname))))
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(unless (file-directory-p parent)
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(make-directory parent t))
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(copy-file name newname t)))
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(defun sync-file (f1 f2)
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"Syncronize newest to oldest file. Parent directories will be created."
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(cond ((and (file-exists-p f1) (file-exists-p f2))
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(cond ((file-newer-than-file-p f1 f2)
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(copy-file f1 f2 t))
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((file-newer-than-file-p f2 f1)
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(copy-file f2 f1 t)) ))
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((and (file-exists-p f1) (not (file-exists-p f2)))
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(copy-file-make-parents f1 f2) )
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((and (file-exists-p f2) (not (file-exists-p f1)))
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(copy-file-make-parents f2 f1)) ))
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(defun sync-files (files)
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"Syncronize newest to oldest files. Parent directories will be created.
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`files' should be in the form (cons f1 f2)."
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(dolist (file files)
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(sync-file (car file) (cdr file))))
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(provide 'sync-file)
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;;; sync-file.el ends here
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