invoice-fs/lib/editFlow.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'),
    colors = require('colors'),
    out = require('./out'),
    EditFlowType = require('./editFlowType');

function EditFlow(config) {
    this.index = 0;
    this.model = {};
    this.steps = [];

    obj.merge(this, config);
}

EditFlow.prototype.updateModel = function(step, input) {
    this.model.data[step.property] = input;
};

EditFlow.prototype.getCurrentValue = function(step) {
    try {
        var existingValue = "";
        if (this.model.data[step.property].length > 0) {
            existingValue = this.model.data[step.property];
        } else if (step.default.toString().length > 0) {
            existingValue = step.format(step.default.toString());
        }
        return existingValue.length > 0 ? existingValue : "";

    } catch (e) {
        this.cancel();
        out.error(e);
    }
};

EditFlow.prototype.showStep = function(step) {
    try {
        process.stdout.write(step.label + (this.getCurrentValue(step).length > 0 ? " (" + this.getCurrentValue(step).bold.green + ")" : "") + " :");
    } catch (e) {
        this.cancel();
        out.error(e);
    }
};

EditFlow.prototype.castInput = function(input) {
    switch (this.steps[this.index].type) {
        case EditFlowType.Integer: {
            input = parseInt(input, 10);
            break;
        }
        case EditFlowType.Decimal: {
            input = parseFloat(input);
            break;
        }
    }
    return input;
};

EditFlow.prototype.listener = function(input) {
    input = input.toString().substring(0, input.length-1);

    if (input.length === 0 && this.getCurrentValue(this.steps[this.index]).length === 0 && this.steps[this.index].required) {
        out.write("Required Value".red);
        this.showStep(this.steps[this.index]);
        return;
    }

    if (input.length === 0) {
        input = this.getCurrentValue(this.steps[this.index]);
    }

    if (!this.castInput(input).toString().match(this.steps[this.index].matches)) {
        out.write("Invalid Entry".red);
        this.showStep(this.steps[this.index]);
        return;
    }

    this.updateModel(this.steps[this.index], this.steps[this.index].format(this.castInput(input)));
    this.index++;

    if (this.index < this.steps.length) {
        this.showStep(this.steps[this.index]);
    } else {
        this.complete();
    }

    //TODO: cancel input
    //this.cancel();
};

EditFlow.prototype.start = function() {
    this.showStep(this.steps[this.index]);
    process.stdin.addListener("data", this.listener.bind(this));
};

EditFlow.prototype.complete = function() {
    this.model.save(function(data) {
        process.stdin.removeAllListeners('data');
        process.stdin.unref();
        if (this.onSave) { this.onSave(data); }
    }.bind(this));
};

EditFlow.prototype.cancel = function() {
    process.stdin.removeAllListeners('data');
    process.stdin.unref();
};

module.exports = EditFlow;