Start work on wiki-engine

Adding wiki-engine.el, wiki-utils.el

1 files changed, 60 insertions, 0 deletions

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+;;; wiki-utils.el -- wiki utility functions -*- lexical-binding: t -*-
+
+;; Copyright (C) 2023 Free Software Foundation.
+
+;; Author: Yuchen Pei <id@ypei.org>
+;; Package-Requires: ((emacs "28.2"))
+
+;; This file is part of wiki.el.
+
+;; wiki.el is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU Affero General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; wiki.el 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 Affero General
+;; Public License for more details.
+
+;; You should have received a copy of the GNU Affero General Public
+;; License along with wiki.el.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; wiki utility functions.
+
+;;; Code:
+(defvar wiki-download-dir "~/Downloads")
+
+(defun wiki-fetch-url (url)
+  "Fetch url and returns the buffer."
+  (interactive "sURL: ")
+  (let ((file-name (expand-file-name (wiki-make-file-name-from-url url)
+                                     wiki-download-dir)))
+    (url-retrieve url 'wiki-fetch-url-save-and-switch (list file-name)))
+  )
+
+(defun wiki-fetch-url-save-and-switch (status file-name)
+  (unless (plist-get status :error)
+    (wiki-delete-http-header)
+    (write-file file-name)
+    (let ((coding-system-for-read 'utf-8))
+      (revert-buffer t t))
+    (switch-to-buffer (current-buffer))))
+
+(defun wiki-delete-http-header ()
+  (delete-region (point-min) (progn (wiki-skip-http-header) (point))))
+
+(defun wiki-skip-http-header ()
+  (goto-char (point-min))
+  (re-search-forward "\r?\n\r?\n"))
+
+(defun wiki-make-file-name-from-url (url)
+  (file-name-nondirectory
+   (directory-file-name
+    (car (url-path-and-query (url-generic-parse-url
+                              (url-unhex-string url)))))))
+
+(provide 'wiki-utils)
+;;; wiki-utils.el ends here