draw7.js

#!/usr/bin/env node

Number.prototype.times = function(f) {
	for (var i = 0; i < this; i++) {
		f(this);
	}
};
Array.prototype.shuffle = function() {
	var a = [].concat(this);
	for (var i = this.length - 1; i > 0; i = 0 | i - 1) {
		var j = 0 | Math.random() * (i + 1);
		var t = a[i];
		a[i] = a[j];
		a[j] = t;
	}
	return a;
};

var read_stdin = function(f) {
	var input = '';
	process.stdin.on('data', function(chunk) {
		input += chunk;
	});
	process.stdin.on('end', function() {
		f(input);
	});
};


var create_deck_list = function(input) {
	var l = [];
	input.split('\n').forEach(function(e) {
		if (/^\d+\s+/.test(e) === false) {return;}
		var count = e.split(/\s+/)[0] | 0;
		var name = e.split(/\s+/)[1];
		count.times(function() {l.push(name);});
	});
	return l;
};

var shuffle_then_draw = function(i) {
	create_deck_list(i)
		.shuffle()
		.slice(0, 7)
		.forEach(function(e) {
			console.log(e);
		});
};

if (process.argv.length >= 3) {
	var fs = require('fs');
	fs.readFile(process.argv[2], 'utf8', function(e, text) {
		shuffle_then_draw(text);
	});
} else {
	read_stdin(shuffle_then_draw);
}