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Diffstat (limited to 'emacs.d/nxhtml/util/ediff-url.el')
| -rw-r--r-- | emacs.d/nxhtml/util/ediff-url.el | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/emacs.d/nxhtml/util/ediff-url.el b/emacs.d/nxhtml/util/ediff-url.el new file mode 100644 index 0000000..12329bd --- /dev/null +++ b/emacs.d/nxhtml/util/ediff-url.el @@ -0,0 +1,188 @@ +;;; ediff-url.el --- Diffing buffer against downloaded url +;; +;; Author: Lennart Borgman (lennart O borgman A gmail O com) +;; Created: Sat Nov 24 2007 +;; Version: 0.56 +;; Last-Updated: 2010-03-18 Thu +;; URL: http://bazaar.launchpad.net/~nxhtml/nxhtml/main/annotate/head%3A/util/ediff-url.el +;; +;; Features that might be required by this library: +;; + ;; `mail-prsvr', `mm-util', `timer', `url-parse', `url-util', + ;; `url-vars'. +;; +;; +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; +;;; Commentary: +;; +;; This file contains a simple function, `ediff-url', to help you +;; update a single file from the web. +;; +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; +;;; Change log: +;; +;; +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; +;; This program 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 2, or +;; (at your option) any later version. +;; +;; This program 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 this program; see the file COPYING. If not, write to +;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth +;; Floor, Boston, MA 02110-1301, USA. +;; +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;; +;;; Code: + +(require 'url-util) +(eval-when-compile (require 'cl)) + +(defvar ediff-url-read-url-history nil) + +(defun ediff-url-redir-launchpad (url) + "Check if bazaar list page on Launchpad. +If URL is a description page for a file uploaded to EmacsWiki +suggest to use the download URL instead." + (let* ((bazaar-url "http://bazaar.launchpad.net/") + (bazaar-len (length bazaar-url))) + (if (and (< bazaar-len (length url)) + (string= bazaar-url (substring url 0 bazaar-len))) + (let* ((url-show-status nil) ;; just annoying showing status here + (buffer (url-retrieve-synchronously url)) + (handle nil) + (http-status nil) + ;; Fix-me: better more flexible pattern? + (dl-patt "<a href=\"\\(.*?\\)\">download file</a>") + dl-url) + (unless buffer + (message "Got empty buffer for %s" url) + (throw 'command-level nil)) + (with-current-buffer buffer + (if (= 0 (buffer-size)) + (progn + (message "Got empty page for %s" url) + (throw 'command-level nil)) + (require 'url-http) + (setq http-status (url-http-parse-response)) + (if (memq http-status '(200 201)) + (progn + (goto-char (point-min)) + (unless (search-forward "\n\n" nil t) + (error "Could not find header end in buffer for %s" url)) + (unless (re-search-forward dl-patt nil t) + (error "Could not find download link")) + (setq dl-url (match-string 1)) + (set-buffer-modified-p nil) + (kill-buffer buffer) + dl-url) + (kill-buffer buffer) + (setq buffer nil) + (setq http-status + (concat (number-to-string http-status) + (case http-status + (401 " (unauthorized)") + (403 " (forbidden)") + (404 " (not found)") + (408 " (request timeout)") + (410 " (gone)") + (500 " (internal server error)") + (503 " (service unavailable)") + (504 " (gateway timeout)") + (530 " (user access denied)") + ))) + (message "Got status %s for %s" http-status url) + (throw 'command-level nil))))) + url))) + +(defun ediff-url-redir-emacswiki-description-page (url) + "Check if description page on EmacsWiki. +If URL is a description page for a file uploaded to EmacsWiki +suggest to use the download URL instead." + ;;(let* ((desc-url "http://www.emacswiki.org/emacs/") + (let* ((emacswiki-url "http://www.emacswiki.org/") + (emacswiki-len (length emacswiki-url))) + (if (and (< emacswiki-len (length url)) + (string= emacswiki-url (substring url 0 emacswiki-len)) + (not (string-match-p "/download/" url))) + (let ((prompt + (concat "This seem to be the description page on EmacsWiki," + "\n\tdo you want the download url instead? "))) + (when (y-or-n-p prompt) + ;;(let ((start (+ 6 (string-match "/wiki/" url)))) + (let ((start (+ 7 (string-match "/emacs/" url)))) + (concat (substring url 0 start) + "download/" + (substring url start))))) + ;; Not on the wiki, just return the url: + url))) + +(defcustom ediff-url-redirects '(ediff-url-redir-emacswiki-description-page + ediff-url-redir-launchpad + ) + "List of functions checking url given to `ediff-url'. +Each function should take an URL as argument and return this URL +or a new URL." + :type '(repeat function) + :group 'ediff) + +;;;###autoload +(defun ediff-url (url) + "Compare current buffer to a web URL using `ediff-buffers'. +Check URL using `ediff-url-redirects' before fetching the file. + +This is for checking downloaded file. A the file may have a comment +telling the download URL of thise form in the header: + + ;; URL: http://the-server.net/the-path/the-file.el + +If not the user is asked for the URL." + (interactive (let ((url-init (url-get-url-at-point))) + (unless url-init + (when (eq major-mode 'emacs-lisp-mode) + (save-excursion + (goto-char (point-min)) + (when (re-search-forward "URL:[ \t]*" nil t) + (setq url-init (url-get-url-at-point)))))) + (list (read-from-minibuffer "Url for download file: " + (cons (or url-init "") 1) ;nil + nil nil + 'ediff-url-read-url-history + ;;url-init + )))) + (catch 'command-level ;; Fix-me: remove and let go to top later + (unless (> (length url) 0) + (message "No URL given, aborted by user") + (throw 'command-level nil)) + ;; Check if URL seems reasonable + (dolist (fun ediff-url-redirects) + (setq url (funcall fun url))) + ;; Fetch URL and run ediff + (let* ((url-buf-name (concat "URL=" url)) + (url-buf (get-buffer url-buf-name))) + (when url-buf + (unless (y-or-n-p "Use previously downloaded url? ") + (kill-buffer url-buf) + (setq url-buf nil))) + (unless url-buf + (setq url-buf (get-buffer-create url-buf-name)) + (let ((current-major major-mode)) + (with-current-buffer url-buf + (url-insert-file-contents url) + ;; Assume same modes: + (funcall current-major)))) + (ediff-buffers url-buf (current-buffer))))) + +(provide 'ediff-url) +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +;;; ediff-url.el ends here |