Proof-of-concept thing for a twitterbot that doesn't repeat words

quit-when-empty.js

var fs = require('fs');

function go() {
    fs.readFile('./unused.txt', function(err, data) {
        if (err) throw err;
        var items = data.toString().split('\n');
        var index = Math.floor(Math.random()*items.length);
        var item = items[index];
        items.splice(index, 1);
        console.log(item);
        fs.writeFileSync('./unused.txt', items.join('\n'));
        fs.appendFileSync('./used.txt', (item + '\n'));
        if (items.length == 0)
            process.exit(0);
    });
}

setInterval(function() {
    go();
}, 1000);

unused.txt

word
more
sea
breeze
green
have
ocean
touch
file

Run with node quit-when-empty.js. If you've made unused.txt in Vim or another editor that handles newlines correctly, then you'll need to reopen it with vim -b unused.txt, do :set noeol, and resave it. Otherwise, one of the "words" output by go() will be an empty string. (Blame JavaScript.)

Since unused.txt and used.txt are updated on every iteration, the program can pick up where it left off if execution is halted before it outputs the entire word list.