browser-sync.js

#!/usr/bin/env node
"use strict";

var meow          = require("meow");
var fs            = require("fs");
var path          = require("path");
var compile       = require("eazy-logger").compile;
var utils         = require("../lib/utils");
var logger        = require("../lib/logger").logger;
var cmdWhitelist  = ["start", "init", "reload"];

var cli = meow({
    pkg:  "../package.json",
    help: getHelpText(path.resolve(__dirname, "../lib/cli/help.txt"))
});

/**
 * Handle cli input
 */
if (!module.parent) {
    handleCli({cli: cli, whitelist: cmdWhitelist});
}

/**
 * Generate & colour the help text
 * @param {String} filepath - relative file path to the help text
 * @returns {String}
 */
function getHelpText(filepath) {

    /**
     * Help text template
     */
    var template = fs.readFileSync(filepath, "utf8");

    cmdWhitelist.forEach(function (command) {

        var flags = require("../lib/cli/opts." + command + ".json");

        template = template.replace(
            ["%", command, "flags%"].join(""),
            listFlags(flags)
        );
    });

    return compile(template);
}

/**
 * @param {{cli: object, [whitelist]: array, [cb]: function}} opts
 * @returns {*}
 */
function handleCli (opts) {

    opts.cb = opts.cb || utils.defaultCallback;

    var input = opts.cli.input;

    if (!opts.whitelist) {
        opts.whitelist = cmdWhitelist;
    }

    if (!input.length || opts.whitelist.indexOf(input[0]) === -1) {
        return console.log(opts.cli.help);
    }

    if (!require("../lib/cli/cli-utils").verifyOpts(input[0], opts.cli.flags)) {
        logger.info("For help, run: {cyan:browser-sync --help}");
        return opts.cb(new Error("Unknown flag given. Please refer to the documentation for help."));
    }

    return require("../lib/cli/command." + input[0])(opts);
}

/**
 * @param {Object} flags
 */
function listFlags (flags) {

    var flagKeys = Object.keys(flags);
    var longest = getLongest(Object.keys(flags));

    if (!longest || !longest.length) {
        return;
    }

    return flagKeys.reduce(function (all, item) {
        return all + "    {bold:--" + item + "}" + getPadding(item.length, longest.length + 8) + flags[item] + "\n";
    }, "");
}

/**
 * @param {Number} len
 * @param {Number} max
 * @returns {string}
 */
function getPadding (len, max) {
    return new Array(max - (len + 1)).join(" ");
}

/**
 * @param {Array} arr
 * @returns {String}
 */
function getLongest (arr) {
    return arr.sort(function (a, b) { return b.length - a.length; })[0];
}

module.exports = handleCli;
module.exports.getHelpText = getHelpText;