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;;; dh-elpa.el --- package.el style packages for Debian -*- lexical-binding:t -*-
;; Copyright (C) 2015 David Bremner
;; Portions Copyright 2007-2015 The Free Software Foundation
;; Author: David Bremner <bremner@debian.org>
;; Created: 11 July 2015
;; Version: 0.0.2
;; Keywords: tools
;; Package-Requires: ((tabulated-list "1.0"))
;; This file is NOT part of GNU Emacs.
;; dh-elpa 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.
;; dh-elpa 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 dh-elpa. If not, see <http://www.gnu.org/licenses/>.
(require 'package)
;; Originally package-unpack from package.el in Emacs 24.5
(defun dhelpa-unpack (pkg-desc destdir &optional epoch-time)
"Install the contents of the current buffer into DESTDIR as a package.
Optional argument EPOCH-TIME specifies time (as a string or
number) to use in autoload files; if unspecifed or nil the
current time is used."
(let* ((name (package-desc-name pkg-desc))
(dirname (package-desc-full-name pkg-desc))
(pkg-dir (expand-file-name dirname destdir))
(pkg-time (if epoch-time (seconds-to-time
(if (stringp epoch-time)
(string-to-number epoch-time)
epoch-time))
(current-time)))
(backup-inhibited t))
(make-directory pkg-dir t)
(pcase (package-desc-kind pkg-desc)
(`tar
(let ((default-directory (file-name-as-directory destdir)))
(package-untar-buffer dirname)))
(`single
(let ((el-file (expand-file-name (format "%s.el" name) pkg-dir)))
(package--write-file-no-coding el-file)))
(kind (error "Unknown package kind: %S" kind)))
(defun dhelpa-autoload-insert-section-header (real-fun outbuf autoloads load-name file time)
(funcall real-fun outbuf autoloads load-name file pkg-time))
(advice-add #'autoload-insert-section-header
:around #'dhelpa-autoload-insert-section-header)
(package--make-autoloads-and-stuff pkg-desc pkg-dir)
(advice-remove #'autoload-insert-section-header
#'dhelpa-autoload-insert-section-header)
pkg-dir))
;; Write out (partial) package description in a form easily parsed by
;; non-lisp tools.
(defun dhelpa-write-desc (desc dest)
(let* ((name (package-desc-name desc))
(version (package-version-join (package-desc-version desc)))
(desc-file (expand-file-name (format "%s.desc" name) dest)))
(with-temp-file desc-file
(insert (format "ELPA-Name: %s\n" name))
(insert (format "ELPA-Version: %s\n" version)))))
;;;###autoload
(defun dhelpa-install-from-buffer (destdir &optional epoch-time)
"Install a package from the current buffer into DESTDIR.
The current buffer is assumed to be a single .el or .tar file
that follows the packaging guidelines; see info
node `(elisp)Packaging'. If EPOCH-TIME is non-nil, it specifies
the time (in seconds since the epoch to be used in the generated
autoload files."
(interactive "D")
(let ((pkg-desc (if (derived-mode-p 'tar-mode)
(package-tar-file-info)
(package-buffer-info))))
(dhelpa-unpack pkg-desc destdir epoch-time)
pkg-desc))
;;;###autoload
(defun dhelpa-batch-install-file ()
"Install third command line argument (an emacs lisp file or tar
file) into second command line argument (a directory). The
optional fourth argument specifies a destination for a package
description file."
(apply #'dhelpa-install-file command-line-args-left))
;;;###autoload
(defun dhelpa-batch-install-directory ()
"Install third command line argument (a directory containing a
multifile elpa package) into second command line argument (a
directory). An optional third command line argument specifies
where to make temporary files and write a descriptor file."
(apply #'dhelpa-install-directory command-line-args-left))
;;;###autoload
(defun dhelpa-install-file (dest el-file &optional desc-dir epoch-time)
"Install EL-FILE (an emacs lisp file or tar file) into DEST (a directory).
Optional DESC-DIR specifies where to write a simplified package description file.
Optional EPOCH-TIME specifies time to use in the generated autoload files."
(with-temp-buffer
(insert-file-contents-literally el-file)
(when (string-match "\\.tar\\'" el-file) (tar-mode))
(let ((desc (dhelpa-install-from-buffer (expand-file-name dest) epoch-time)))
(when desc-dir
(dhelpa-write-desc desc desc-dir)))))
;;;###autoload
(defun dhelpa-install-directory (dest elpa-dir &optional work-dir epoch-time)
"Install ELPA-DIR (an unpacked elpa tarball) into DEST (a directory).
The directory must either be named `package' or
`package-version'. If a working directory WORK-DIR is specified,
cleaning up is the caller's responsibility. Optional EPOCH-TIME
specifies time to use in generated autoloads files."
(let* ((desc (package-load-descriptor elpa-dir)))
(if (not desc)
(message "Could not compute version from directory %s" elpa-dir)
(let* ((canonical-dir (package-desc-full-name desc))
(base-dir (file-name-nondirectory elpa-dir))
(parent-dir (file-name-directory elpa-dir))
(temp-dir (or work-dir (make-temp-file nil t)))
(tar-file (concat (expand-file-name canonical-dir temp-dir) ".tar"))
;; this relies on GNU tar features.
(transform-command (concat "--transform=s/"
(regexp-quote base-dir) "/" canonical-dir "/")))
(call-process "tar" nil nil nil "--create" "-C" parent-dir transform-command
"--file" tar-file base-dir)
(dhelpa-install-file dest tar-file work-dir epoch-time)
(unless work-dir
(delete-file tar-file)
(delete-directory temp-dir))))))
;;; dh-elpa.el ends here
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