just-build/dist/extract-config.js

A simple task runner that doesn't bloat your package

var ref = require ('./dirutils');
var getPackageRoot = ref.getPackageRoot;
var fs = require('fs');
var path = require('path');
var ref$1 = require ('./extend');
var clone = ref$1.clone;

function extractConfig (args, ref) {
    var cwd = ref.cwd;
    var env = ref.env;

    args = args.slice(2);
    var pkg = getPackageOption(args) || cwd;
    var pkgIsDir = fs.lstatSync(pkg).isDirectory();
    var pkgDir = pkgIsDir ? pkg : path.dirname(pkg);
    var packageRoot = getPackageRoot(pkgDir);
    if (!packageRoot)
        { throw new Error(("Could not find npm package in " + pkgDir)); }
    var configFile = pkgIsDir ?
        path.resolve(packageRoot, 'package.json') :
        pkg;
    if (!fs.existsSync(configFile))
        { throw new Error(("File not found: " + configFile)); }

    var cfg = JSON.parse(fs.readFileSync(configFile));

    var taskSet = cfg["just-build"];
    if (!taskSet)
        { throw new Error (("\"just-build\" attribute missing in " + configFile)); }

    if (typeof taskSet !== 'object')
        { throw new Error (("\"just-build\" attribute not an object in " + configFile)); }

    var tasksToRun = args.filter(function (arg) { return arg.indexOf('-') !== 0; });
    if (tasksToRun.length === 0) {
        if (!taskSet["default"])
            { throw new Error (("No default task exists in " + configFile)); }
        tasksToRun = ["default"];
    }

    // Make sure packageRoot/node_modules/.bin is part of PATH.
    var PATH = env.PATH || "";
    var node_modules_bin = path.resolve(packageRoot, 'node_modules/.bin');
    if (PATH.indexOf(("node_modules" + (path.sep) + ".bin")) === -1) {
        PATH = "" + PATH + (path.delimiter) + node_modules_bin;
    }

    return {
        dir: packageRoot,
        taskSet: taskSet,
        tasksToRun: tasksToRun,
        watchMode: args.some(function (arg) { return arg === '--watch' || arg === '-w'; }),
        env: clone(cfg, env), // Pass package.json as ENV vars unless overrided by os ENV vars.
        packageRoot: packageRoot
    };
}

function getPackageOption(args) {
    var idxPackage = args.indexOf('--package');
    if (idxPackage === -1) { idxPackage = args.indexOf('-p'); }
    if (idxPackage >= 0 && idxPackage + 1 < args.length) {
        return args[idxPackage + 1];
    }
    return null;
}

module.exports = {extractConfig: extractConfig};