old_contents: var webViewer = require("web-viewer"),
  	opener = require("opener"),
  	app = webViewer();
  	
  app.file(function(req, res){
  	// render reader
  	// req.path ...
  });
  
  app.dir(function(req, res){
  	// render file list
  });
  
  app.listen(8080, function(){
  	opener("http://localhost:" + PORT);
  });
  
new_contents: var doc = `Comic Viewer
  
  Usage
    comic-viewer [--port <port>] [--no-server] <file>
    comic-viewer --help | --version
    
  Options:
    --port       Set the port of the server. [default: 8080]
    --no-server  Launch the file without starting comic-viewer server.
    --help       Show help message.
    --version    Show version number.`;
  
  var docopt = require("docopt"),
  	arguments = docopt(doc, {version: "0.1.0"});
  	webViewer = require("web-viewer"),
  	opener = require("opener"),
  	app = webViewer(),
  	PORT = 8080;
  
  app.file(function(req, res){
  	// render reader
  	// req.path ...
  });
  
  app.dir(function(req, res){
  	// render file list
  });
  
  app.listen(PORT);
  
subject: Use docopt