unify.js

var dates = require('./dates.json'),
    all = require('./us-2.json'),
    sys = require('sys'),
    fs = require('fs'),
    moment = require('moment'),
    exec = require('child_process').exec;

/*
 * Check for equality
console.log(
    dates.map(function(_) { return _[0] }).sort().join(',') ==
    all.features.map(function(_) { return _.properties.NAME }).sort().join(',')
);
*/

var a = moment('Jan 1, 2013').unix(),
    b = moment('Jan 1, 2014').unix(),
    ai = moment(dates[0][1]).unix(),
    bi = moment(dates[dates.length - 1][1]).unix();

function interp(_) {
    return (((_ - ai) / (bi - ai)) * (b - a)) + a;
}

var fc = { type: 'FeatureCollection', features: [] };
dates = dates.map(function(d) {
    d[2] = moment(interp(moment(d[1]).unix()) * 1000).format('MMMM D h:mm YYYY +0100');
    return d;
});

console.log(dates);

function run() {
    console.log(arguments);
    if (!dates.length) return;
    var date = dates.shift();
    var state = all.features.filter(function(f) {
        return f.properties.NAME == date[0];
    })[0];
    fc.features.push(state);
    fs.writeFileSync('us.geojson', JSON.stringify(fc, null, 4));
    exec('git add us.geojson', function() {
        var cmd = 'git commit -m "' + date[0] + ' joins the United States of America" --date="' + date[2] + '"';
        console.log(cmd);
        exec(cmd, function() {
            console.log(arguments);
            setTimeout(run, 1000);
        });
    });
}

run();