code.delx.au - gnu-emacs-elpa/blob - packages/context-coloring/scripts/download-dependencies.el

   1 ;;; scripts/download-dependencies.el --- Get files for development. -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2014-2015  Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; This program is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation, either version 3 of the License, or
  10 ;; (at your option) any later version.
  11
  12 ;; This program is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 ;; Download dependencies for development.
  21
  22 ;; Dependencies don't need to be version-controlled. They are also
  23 ;; bleeding-edge, which is good because that is what most MELPA users are using.
  24
  25 ;;; Code:
  26
  27 (defconst download-dependencies-directory
  28   (file-name-directory (or load-file-name buffer-file-name))
  29   "This file's directory.")
  30
  31 (defun download-dependencies-resolve-path (path)
  32   "Resolve a path relative to this file's directory."
  33   (expand-file-name path download-dependencies-directory))
  34
  35 (defun download-dependencies-strip-headers ()
  36   "Remove the http headers included in the output of
  37 `url-retrieve-synchronously'."
  38   (goto-char 1)
  39   (kill-paragraph 1) ; The headers are 1 paragraph.  I hope.
  40   (kill-line))       ; A line separates the headers from the file's content.
  41
  42 (defun download-dependencies-get-dependencies ()
  43   "Read the `dependencies' file as a list of URLs."
  44   (with-temp-buffer
  45     (insert-file-contents (download-dependencies-resolve-path "./dependencies"))
  46     (split-string (buffer-substring-no-properties (point-min) (point-max)))))
  47
  48 (defun download-dependencies ()
  49   "Download dependencies for development."
  50   (let ((files (download-dependencies-get-dependencies)))
  51     (make-directory (download-dependencies-resolve-path "../libraries") t)
  52     (dolist (file files)
  53       (let* ((basename (file-name-nondirectory file))
  54              (destination (download-dependencies-resolve-path
  55                            (concat "../libraries/" basename))))
  56         (unless (file-exists-p destination)
  57           (with-current-buffer (url-retrieve-synchronously file)
  58             (download-dependencies-strip-headers)
  59             (write-file destination)))))))
  60
  61 ;;; download-dependencies.el ends here