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|
;;; 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
|
