invoice-fs/lib/state.js

Nostalgic command-line invoicing application producing plain text invoices and JSON data structures. Uses the file system as a database

var obj = require('javascript-object-paraphernalia'),
    fs = require('fs'),
    appStateFile = './data/application.json',
    writeDataSync = require('./writeDataSync');

function State() {
    this.createFileIfNeeded(appStateFile);
    obj.merge(this, JSON.parse(fs.readFileSync(appStateFile, 'utf8')));
}

State.prototype.createFileIfNeeded = function(filename) {
    try {
        fs.lstatSync(filename);
    } catch (e) {
        fs.writeFileSync(filename, "");
    }
};

State.prototype.set = function(name, value, callback) {
    this[name] = value;
    this.save(callback);
};

State.prototype.get = function(name) {
    return this[name];
};

State.prototype.save = function(callback) {
    writeDataSync(appStateFile, this, callback);
};

module.exports = new State();