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Web Article Realtime Preview for Emacs
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Warp provides Emacs with ability of realtime preview of html documents and documents which can be converted to htmls. Preview opens in web browser.


  • Realtime HTML Preview using WebSocket
  • Auto Open/Close Browser Preview Window
  • Auto Scroll Synchronizing
  • Supports a Number of Formats

Confirmed Environment

  • Node.js 0.6.11, 0.7.2
  • Emacs 23.3, 24.1
  • Latest Google Chrome, Mozilla Firefox
  • OSX 10.7, Ubuntu Linux 11.04


  1. Install node.js with package or nave.

  2. Install npm .

  3. Clone this repository.

     $ cd /path/to/your/repos
     $ git clone 
  4. Install websocket npm module.

     $ cd Warp
     $ npm install

    or, for grobal install, execute npm install -g websocket

  5. Put following lines into your ~/.emacs.d/init.el or other init file.

     (add-to-list 'load-path "/path/to/warp-directory")
     (require 'warp)
     (global-set-key (kbd "C-c C-w C-w") warp-mode) ;; Modify key bind as you want.
     ;; Set markdown converter (if you want)
     (add-to-list 'warp-format-converter-alist
                  '("\\.md\\|\\.markdown" t (lambda ()
                                              ;; Set command you are using
     ;; Below line is needed if you installed websocket npm module globally.
     (setenv "NODE_PATH" "/path/to/global/node_modules")
     ;; or, if you have setup NODE_PATH in the shell
     (setenv "NODE_PATH"
              "\n+$" "" (shell-command-to-string "echo $NODE_PATH")))


  1. Restart Emacs once you have installed Warp.

  2. Install Markdown command line tool into directory in the PATH.

  3. Open this README.

     C-x C-f /path/to/warp-directory/
  4. Execute warp-mode command.

     M-x warp-mode


In the document's buffer you want to see preview, execute warp-mode command. By default, a browser tab (or window if you don't have any) will open and html-rendered preview of the buffer will be displayed in real time. After finished editing, execute warp-mode again or simply kill buffer to disable preview.


Below commands are bound to specific key bind by default.

  • warp-start-server

    Start Warp server. Bound to C-c C-w s.

  • warp-stop-server

    Stop Warp server. Bound to C-c C-w i.

  • warp-open-client

    Open Warp client. Bound to C-c C-w o.

  • warp-send-current-buffer

    Send current buffer to Warp server, convert buffer if needed. Bound to C-c C-w w.

For reference of other commands, please take a look inside warp.el.


Exec M-x customize-group RET warp to see all customize options.

init.el Examples

  • Disable auto refresh and scroll syncing.

       '(warp-auto-start-sending nil)
       '(warp-auto-start-auto-scroll nil))
  • Set custom converter.

    • Use Major Mode symbol

        (add-to-list 'warp-format-converter-alist
                     '(markdown-mode t (lambda ()
    • textile

        (add-to-list 'warp-format-converter-alist
                     '("\\.textile" t (lambda () '("redcloth"))))
    • github-markup (Not tested all formats..)

        (add-to-list 'warp-format-converter-alist
                       (lambda ()
                         (let* ((string (buffer-string))
                                (ext (file-name-extension (buffer-file-name)))
                                (temp-file (concat "warp-temp." ext)))
                           (with-temp-file temp-file
                             (insert string))
                           (list "github-markup" temp-file)))))

Known Issues

  • Stuck when editing too large buffer.
  • Client's display will chatter when resources are fetched from server not browser cache.

Extra Stuff


warp-reload.el provides global minor mode to load specific url on save buffers.


Put following lines to your ~/.emacs.d/init.el

    ;; ;; if you haven't set up yet
    ;; (add-to-list 'load-path "/path/to/warp-directory")

    (require 'warp-reload)
    (global-set-key (kbd "C-c C-w C-r") 'warp-reload)


Exec M-x warp-reload or C-c C-w C-r and input url you want to reload on prompt. When you want to change url for reloading, exec M-x warp-reload-change-url or C-c C-w C-c.


  • 0.0.2 Availability for Setting Converters with Major Mode Symbol
  • 0.0.1 Initial Version


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request
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