Initial commit

.gitignore

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+node_modules

index.js

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+'use strict';
+
+const help = {
+  command: 'help',
+  hidden: true,
+  func: function(fredrick, args) {
+    fredrick.write('Help:');
+    fredrick.exit(0);
+  }
+}
+
+const list = {
+  command: 'list',
+  hidden: true,
+  func: function(fredrick, args) {
+    fredrick.write('List:');
+    fredrick.write();
+
+    fredrick.plugins.forEach((plugin) => {
+      if (plugin.hidden) return;
+
+      fredrick.write(plugin.command);
+      fredrick.write(`  ${plugin.description}`);
+    });
+
+    fredrick.write();
+
+    fredrick.exit(0);
+  }
+}
+
+class Fredrick {
+  constructor(name, options) {
+    options      = options || {};
+    this.name    = name;
+    this.stdout  = options.stdout || process.stdout;
+    this.exit    = options.exit || process.exit.bind(process);
+    this.plugins = [];
+
+    this.addPlugin(help);
+    this.addPlugin(list);
+  }
+
+  write(str) {
+    if (!str) {
+      return this.stdout.write('\n');
+    }
+
+    this.stdout.write(`${str}\n`);
+  }
+
+  respond(args) {
+    let command = args[0];
+    let plugin  = this.findPlugin(command);
+
+    if (!plugin) return;
+
+    args = args.slice(1);
+    plugin.func(this, args);
+  }
+
+  findPlugin(command) {
+    return this.plugins.find((plugin) => {
+      return plugin.command === command;
+    });
+  }
+
+  addPlugin(plugin) { this.plugins.push(plugin); }
+}
+
+module.exports = Fredrick;

package.json

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+{
+  "name": "fredrick",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "tape test/**/*_test.js"
+  },
+  "author": "Brandon Farmer <bthesorceror@gmail.com>",
+  "license": "ISC",
+  "devDependencies": {
+    "sinon": "^1.17.3",
+    "tape": "^4.4.0"
+  },
+  "dependencies": {}
+}

test/fredrick_test.js

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+var test     = require('tape');
+var Fredrick = require('../index');
+var sinon    = require('sinon');
+
+test('Fredrick responds to help command', function(t) {
+
+  var fakeStdout = { write: sinon.spy() };
+  var fakeExit   = sinon.spy();
+
+  var fredrick = new Fredrick('fredrick', {
+    stdout: fakeStdout, exit: fakeExit
+  });
+
+  var args = ['help'];
+
+  fredrick.respond(args);
+
+  t.plan(2);
+  t.ok(fakeStdout.write.calledWith('Help:\n'), 'writes header');
+
+  t.ok(fakeExit.calledWith(0), 'exits cleanly');
+
+});
+
+test('Fredrick responds to list command', function(t) {
+
+  var fakeStdout = { write: sinon.spy() };
+  var fakeExit   = sinon.spy();
+
+  var fredrick = new Fredrick('fredrick', {
+    stdout: fakeStdout, exit: fakeExit
+  });
+
+  var args = ['list'];
+
+  function noop(){};
+
+  fredrick.addPlugin({
+    command: 'test1',
+    func: noop,
+    description: 'description 1'
+  });
+
+  fredrick.addPlugin({
+    command: 'test2',
+    func: noop,
+    description: 'description 2'
+  });
+
+  fredrick.respond(args);
+
+  t.plan(7);
+  t.ok(fakeStdout.write.calledWith('List:\n'), 'writes header');
+
+  t.ok(
+    fakeStdout.write.calledWith('test1\n'), 
+    'writes test1 command'
+  );
+
+  t.ok(
+    fakeStdout.write.calledWith('  description 1\n'), 
+    'writes test1 description'
+  );
+
+  t.ok(
+    fakeStdout.write.calledWith('test2\n'), 
+    'writes test2 command'
+  );
+
+  t.ok(
+    fakeStdout.write.calledWith('  description 2\n'), 
+    'writes test2 description'
+  );
+
+  t.notOk(
+    fakeStdout.write.calledWith('help\n'), 
+    'does not write help command'
+  );
+
+  t.ok(fakeExit.calledWith(0), 'exits cleanly');
+
+});