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