133 lines
4.5 KiB
EmacsLisp
133 lines
4.5 KiB
EmacsLisp
;;; markdown-preview-mode.el --- markdown realtime preview minor mode.
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;; Copyright (C) 2014 <igor.shimko@gmail.com>
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;; Author: Igor Shymko <igor.shimko@gmail.com>
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;; URL: https://github.com/ancane/markdown-preview-mode
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;; Keywords: markdown, preview
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;; Package-Requires: ((websocket "1.3") (markdown-mode "2.0"))
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;; This file is not part of GNU Emacs.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; 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
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;; GNU 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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(eval-when-compile (require 'cl))
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(require 'websocket)
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(require 'markdown-mode)
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(defgroup markdown-preview-mode nil
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"Markdown preview mode"
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:group 'text
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:prefix "mdpm:")
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(defvar mdpm:websocket-port 7379)
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(defvar mdpm:websocket-server nil)
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(defvar mdpm:local-client nil)
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(defvar mdpm:remote-clients nil)
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(defvar mdpm:preview-url (concat (file-name-directory load-file-name) "preview.html"))
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(defvar mdpm:style "http://thomasf.github.io/solarized-css/solarized-dark.min.css")
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(defun mdpm:open-browser-preview ()
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(browse-url mdpm:preview-url))
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(defun mdpm:stop-websocket-server ()
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(when mdpm:local-client
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(websocket-close mdpm:local-client))
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(when mdpm:websocket-server
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(delete-process mdpm:websocket-server)
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(setq mdpm:websocket-server nil
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mdpm:remote-clients nil)))
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(defun mdpm:drop-closed-clients ()
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(setq mdpm:remote-clients
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(remove-if-not #'websocket-openp mdpm:remote-clients)))
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(defun mdpm:start-websocket-server ()
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(when (not mdpm:websocket-server)
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(setq mdpm:websocket-server
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(websocket-server
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mdpm:websocket-port
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:on-message (lambda (websocket frame)
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(mapc (lambda (ws)
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(websocket-send-text ws
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(websocket-frame-payload frame)))
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mdpm:remote-clients))
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:on-open (lambda (websocket)
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(push websocket mdpm:remote-clients)
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(mdpm:sent-preview-to websocket))
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:on-error (lambda (websocket type err) (message (concat "====> Error:" err)))
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:on-close (lambda (websocket) (mdpm:drop-closed-clients))))
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(add-hook 'kill-emacs-hook 'mdpm:stop-websocket-server)
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(mdpm:open-browser-preview)))
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(defun mdpm:start-local-client ()
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(when (not mdpm:local-client)
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(setq mdpm:local-client
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(websocket-open
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(format "ws://localhost:%d" mdpm:websocket-port)
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:on-error (lambda (ws type err)
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(message "error connecting"))
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:on-close (lambda (websocket)
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(setq mdpm:local-client nil))))))
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(defun mdpm:send-preview ()
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(mdpm:sent-preview-to mdpm:local-client))
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(defun mdpm:sent-preview-to (websocket)
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(when markdown-preview-mode
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(markdown markdown-output-buffer-name))
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(with-current-buffer (get-buffer markdown-output-buffer-name)
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(websocket-send-text websocket
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(concat
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"<div>"
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"<span id='style'>"
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mdpm:style
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"</span>"
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"<div id='content'>"
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(buffer-substring-no-properties (point-min) (point-max))
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"</div>"
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"</div>")
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)))
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(defun mdpm:start ()
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(mdpm:start-websocket-server)
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(mdpm:start-local-client)
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(add-hook 'after-save-hook 'mdpm:send-preview nil t))
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(defun mdpm:stop ()
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(remove-hook 'after-save-hook 'mdpm:send-preview t))
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(defun markdown-preview-open-browser ()
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(interactive)
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(mdpm:open-browser-preview))
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(defun markdown-preview-cleanup ()
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(interactive)
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(mdpm:stop-websocket-server))
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(define-minor-mode markdown-preview-mode
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"Markdown preview mode"
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:group 'markdown-preview-mode
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:init-value nil
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(when (not (equal major-mode 'markdown-mode))
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(markdown-mode))
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(if markdown-preview-mode
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(mdpm:start)
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(mdpm:stop)))
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(provide 'markdown-preview-mode)
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;;; markdown-preview-mode.el ends here
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