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syohex/realtime_markdown_viewer.rb

Created October 21, 2012 04:06
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Realtime markdown viewer by Sinatra
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realtime_markdown_viewer.rb
#!/usr/bin/env ruby
# -*- coding:utf-8 -*-
require 'sinatra'
require 'sinatra-websocket'
require 'redcarpet'
set :server, 'thin'
set :sockets, []
get '/' do
erb :index
end
get '/emacs' do
request.websocket do |ws|
ws.onopen { puts "@@ connect from emacs" }
ws.onmessage do |msg|
markdown = RedcarpetCompat.new(msg)
html = markdown.to_html
EM.next_tick do
settings.sockets.each{|s| s.send(html) }
end
end
ws.onclose do
settings.sockets.delete(ws)
end
end
end
get '/markdown' do
request.websocket do |ws|
ws.onopen do
settings.sockets << ws
end
ws.onclose do
warn("wetbsocket closed")
settings.sockets.delete(ws)
end
end
end
get '/static/:file.min.:ext' do |file, ext|
content_type ext
send_file "static/#{file}.min.#{ext}"
end
__END__
@@ index
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Realtime Markdown Viewer</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script type="text/javascript" src="/static/jquery.min.js"></script>
<link rel="stylesheet" href="/static/bootstrap.min.css">
</head>
<body>
<div class="container">
<header><h1>Demo</h1></header>
<div id="preview"></div>
</div>
<script type="text/javascript">
$(function () {
var ws = new WebSocket('ws://localhost:5021/markdown');
ws.onopen = function () {
console.log('connected');
};
ws.onclose = function (ev) {
console.log('closed');
};
ws.onmessage = function (ev) {
$('#preview').html(ev.data);
};
ws.onerror = function (ev) {
console.log(ev);
};
});
</script>
</body>
</html>
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