codepad.el

;; codepad.el --- Emacs integration for codepad.org
;;
;; Author: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
;; Contributors: Thomas Weidner <thomas001le@gmail.com>
;; Website: http://github.com/ruediger/emacs-codepad
;; Created: <2009-11-29>
;; Keywords: codepad paste pastie pastebin
;;
;; This code is inspired by gist.el (written by Christian Neukirchen et.al.)
;; see http://github.com/defunkt/gist.el/blob/master/gist.el
;;
;; This file is NOT part of GNU Emacs.
;;
;; This 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 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
;; MA 02111-1307, USA.

;;; Commentary:

;; This code can be used to paste code to codepad.org.

;; codepad-paste-region pastes a region to codepad.org.  The URL is printed
;; and if codepad-view is T opened in the browser.
;;
;; codepad-paste-buffer pastes the whole buffer.

;; TODO:

;; * fetch Output from codepad.org (if run is True)
;; * support projects (http://project.codepad.org)
;; * support user accounts

;;; Code:

(defconst +codepad-url+ "http://codepad.org"
  "Url to codepad.org.")

(defconst +codepad-lang+ '((c-mode . "C")
                           (c++-mode . "C++")
                           (d-mode . "D")
                           (haskell-mode . "Haskell")
                           (lua-mode . "Lua")
                           (ocaml-mode . "OCaml")
                           (php-mode . "PHP")
                           (perl-mode . "Perl")
                           (python-mode . "Python")
                           (ruby-mode . "Ruby")
                           (scheme-mode . "Scheme")
                           (tcl-mode . "Tcl"))
  "Association of major-modes to language names used by codepad.org.")

(defconst +codepad-default-lang+ "Plain Text"
  "Language if `major-mode' is not supported by codepad.org.")

(defgroup codepad nil
  "Codepad paste support"
  :prefix "codepad-"
  :tag "Codepad"
  :group 'external
  :link '(url-link "http://github.com/ruediger/emacs-codepad"))

(defcustom codepad-private 'ask
  "Private pastes?"
  :group 'codepad
  :type '(radio
          (const :tag "Always ask" :value ask)
          (const :tag "Check prefix" :value prefix)
          (const :tag "No" :value no)
          (const :tag "Yes" :value yes)))

(defcustom codepad-run 'yes
  "Run pastes?"
  :group 'codepad
  :type '(radio
          (const :tag "Always ask" :value ask)
          (const :tag "Check prefix" :value prefix)
          (const :tag "No" :value no)
          (const :tag "Yes" :value yes)))

(defcustom codepad-view t
  "View paste in browser?"
  :group 'codepad
  :type 'boolean)

(defcustom codepad-autoset-mode t
  "Try to determine and set mode for fetched code?"
  :group 'codepad
  :type 'boolean)

(defcustom codepad-autofork t
  "Create new pastes as a fork of `codepad-id'?"
  :group 'codepad
  :type 'boolean)

(defcustom codepad-use-x-clipboard t
  "Copy URL also to the X clipboard?"
  :group 'codepad
  :type 'boolean)

(defun codepad-read-p (prompt &optional default)
  "Read true (t,y,true,yes) or false (nil,false,no) from the minibuffer.
Uses PROMPT as prompt and DEFAULT is the default value."
  (let ((val (downcase (read-string (concat prompt " (default "
                                            (if default "Yes" "No") "): ")))))
    (cond
      ((string= val "") default)
      ((member val '("t" "y" "true" "yes")) t)
      ((member val '("nil" "f" "n" "false" "no")) nil)
      (t (message "Wrong input '%s'! Please enter either Yes or No" val)
         (codepad-read-p prompt default)))))

(defun codepad-interactive-option (var prompt)
  "Handle interactive option for VAR.  Use PROMPT if user is asked."
  (case var
    ((ask) (codepad-read-p prompt))
    ((no) nil)
    ((yes) t)
    ((prefix) current-prefix-arg)
    (t var)))

(defun codepad-true-or-false (val)
  "Convert VAL into a string True or False."
  (if val
      "True"
      "False"))

(defun codepad-url-encode (string)
  "Encode STRING.  Like `url-hexify-string' but space is turned into +."
  (replace-regexp-in-string "%20" "+" (url-hexify-string string)))

;; copied from gist.el
(defun codepad-make-query-string (params)
  "Return a query string constructed from PARAMS.
PARAMS should be a list with elements of the form (KEY . VALUE).  KEY and VALUE
should both be strings."
  (mapconcat
   (lambda (param)
     (concat (codepad-url-encode (car param)) "="
             (codepad-url-encode (cdr param))))
   params "&"))

;;;###autoload
(defun* codepad-paste-region (begin end
                              &optional (private 'check-custom)
                              (fork 'check-custom)
                              callback cbargs)
  "Paste region to codepad.org.
If PRIVATE is set the pase will be private.
If FORK is set to an id the paste will be created as a fork of this paste.
If FORK is set to 'auto (or to check-custom and codepad-autofork is t) it
will fork the paste in `codepad-id'.
Call CALLBACK as (apply CALLBACK URL ERR-P CBARGS) where ERR-P is nil and
URL is the resulted url in the case of success or ERR is an error descriptor."
  (interactive "r")
  (let* ((codepad-url (cond
                        ((and
                          (or (eql fork 'auto)
                              (and (eql fork 'check-custom)
                                   codepad-autofork))
                          (stringp codepad-id))
                         (format "%s/%s/fork" +codepad-url+ codepad-id))
                        ((stringp fork)
                         (format "%s/%s/fork" +codepad-url+ fork))
                        (t +codepad-url+)))
         (private (codepad-interactive-option (if (eql private 'check-custom)
                                                  codepad-private
                                                  private)
                                              "Private Paste?"))
         (lang (or (cdr (assoc major-mode +codepad-lang+))
                   +codepad-default-lang+))
         (run (codepad-interactive-option codepad-run "Run Paste?"))
         (url-max-redirections 0)
         (url-request-method "POST")
         (url-request-extra-headers
          '(("Content-type" . "application/x-www-form-urlencoded")))
         (url-request-data
          (codepad-make-query-string
           `(("submit" . "Submit")
             ("private" . ,(codepad-true-or-false private))
             ("run" . ,(codepad-true-or-false run))
             ("lang" . ,lang)
             ("code" . ,(buffer-substring begin end))))))
    (url-retrieve codepad-url
                  (lambda (status callback cbargs)
                    (let ((url (plist-get status :redirect))
                          (err (plist-get status :error)))
                      (when callback
                        (apply callback url err cbargs))
                      (when err
                        (signal (car err) (cdr err)))
                      (message "Paste created: %s" url)
                      (when codepad-view (browse-url url))
                      (let ((x-select-enable-clipboard
                             (or codepad-use-x-clipboard
                                 x-select-enable-clipboard)))
                        (kill-new url))
                      (kill-buffer (current-buffer))
                      url))
                  (list callback cbargs))))

;;;###autoload
(defun* codepad-paste-buffer (&optional
                              (private 'check-custom)
                              (fork 'check-custom)
                              callback cbargs)
  "Paste buffer to codepad.org.  See `codepad-paste-region'."
  (interactive)
  (codepad-paste-region (point-min) (point-max) private callback cbargs))

(defconst +codepad-mime-to-mode+ '(("c++src" . c++-mode)
                                   ("csrc" . c-mode)
                                   ("dsrc" . d-mode)
                                   ("haskell" . haskell-mode)
                                   ("lua" . lua-mode)
                                   ("ocaml" . ocaml-mode)
                                   ("php" . php-mode)
                                   ("perl" . perl-mode)                                   
                                   ("python" . python-mode)
                                   ("ruby" . ruby-mode)
                                   ("scheme" . scheme-mode)
                                   ("tcl" . tcl-mode))
  "MIME text/x-... to emacs mode.")

(defvar url-http-content-type)

(defvar codepad-id nil "ID on Codepad or nil. Buffer local.")

;;;###autoload
(defun codepad-fetch-code (id &optional buffer-name)
  "Fetch code from codepad.org.
Argument ID is the codepad id and
optional argument is the BUFFER-NAME where to write."
  (interactive "sCodepad ID: ")
  (let* ((just-id (replace-regexp-in-string "^.*/" "" id)) ; strip http://...
         (buffer-name (or buffer-name (format "*codepad %s*" just-id)))
         (url (concat +codepad-url+ "/" just-id "/raw"))
         (buffer (get-buffer buffer-name)))
    (if (bufferp buffer)
        (pop-to-buffer buffer)

        (message "Fetching %s from Codepad" just-id)
        (url-retrieve url
         (lambda (status buffer-name just-id)
           (let ((err (plist-get status :error)))
             (when err
               (signal (car err) (cdr err))))
           (rename-buffer buffer-name t)
           
           ;; set codepad-id to the id
           (make-local-variable 'codepad-id)
           (setq codepad-id just-id)

           ;; Delete Headers
           (goto-char (point-min))
           (re-search-forward "\n\n") ; Find end of Headers
           (delete-region (point-min) (point))

           ;; Determine and set mode
           (if (and codepad-autoset-mode
                    url-http-content-type
                    (string-match "text/x-\\([^;[:space:]]*\\)"
                                  url-http-content-type))
               (let ((mode
                      (cdr (assoc
                            (match-string 1 url-http-content-type)
                            +codepad-mime-to-mode+))))
                 (if mode
                     (funcall mode)
                     (fundamental-mode)))
               (fundamental-mode))
           (set-buffer-modified-p nil)
           (pop-to-buffer (current-buffer)))
         (list buffer-name just-id)))))

(provide 'codepad)
;;; codepad.el ends here