CLI refactor with commander (#6058)

* CLI refactor with commander

- Modularized the functionality
- All functionality done directly from `./nodebb` now
(still available from `app` for backwards compatibility)
- Moved all CLI code from `./nodebb` to `src/cli`
- Fixed `nodebb.bat` to work from any location, like `./nodebb`, and
also hides command output
- Overwrite some commander methods to add CLI color support
- Added `./nodebb info` for quick info including git hash, NodeBB
version, node version, and some database info
- Refactored `./nodebb reset` to allow multiple resets at once
- Changed `./nodebb restart` to essentially stop and start, as Windows
doesn't support signals
- Added `-l, --log` option which works on `./nodebb start` and `./nodebb
restart` to show logging, like `./nodebb slog`
- Expanded `-d, --dev` option which works on them as well, like
`./nodebb dev`
- Improvements to self-help. `./nodebb build -h` will output all
possible targets
- `./nodebb reset` explains usage better

* Fix some style inconsistencies

* Fix prestart being required before modules installed

* Fix travis failures

* Fix `help` command to output help for subcommands

* Pick steps of the upgrade process to run

* Fix formatting for upgrade help

* Fix web installer

src/prestart.js

@@ -0,0 +1,84 @@
+'use strict';
+
+var nconf = require('nconf');
+var url = require('url');
+var winston = require('winston');
+var path = require('path');
+
+var pkg = require('../package.json');
+var dirname = require('./cli/paths').baseDir;
+
+function setupWinston() {
+	winston.remove(winston.transports.Console);
+	winston.add(winston.transports.Console, {
+		colorize: true,
+		timestamp: function () {
+			var date = new Date();
+			return nconf.get('json-logging') ? date.toJSON() :
+				date.getDate() + '/' + (date.getMonth() + 1) + ' ' +
+				date.toTimeString().substr(0, 8) + ' [' + global.process.pid + ']';
+		},
+		level: nconf.get('log-level') || (global.env === 'production' ? 'info' : 'verbose'),
+		json: !!nconf.get('json-logging'),
+		stringify: !!nconf.get('json-logging'),
+	});
+}
+
+function loadConfig(configFile) {
+	winston.verbose('* using configuration stored in: %s', configFile);
+
+	nconf.file({
+		file: configFile,
+	});
+
+	nconf.defaults({
+		base_dir: dirname,
+		themes_path: path.join(dirname, 'node_modules'),
+		upload_path: 'public/uploads',
+		views_dir: path.join(dirname, 'build/public/templates'),
+		version: pkg.version,
+	});
+
+	if (!nconf.get('isCluster')) {
+		nconf.set('isPrimary', 'true');
+		nconf.set('isCluster', 'false');
+	}
+
+	// Ensure themes_path is a full filepath
+	nconf.set('themes_path', path.resolve(dirname, nconf.get('themes_path')));
+	nconf.set('core_templates_path', path.join(dirname, 'src/views'));
+	nconf.set('base_templates_path', path.join(nconf.get('themes_path'), 'nodebb-theme-persona/templates'));
+
+	nconf.set('upload_path', path.resolve(nconf.get('base_dir'), nconf.get('upload_path')));
+
+	if (nconf.get('url')) {
+		nconf.set('url_parsed', url.parse(nconf.get('url')));
+	}
+
+	// Explicitly cast 'jobsDisabled' as Bool
+	var castAsBool = ['jobsDisabled'];
+	nconf.stores.env.readOnly = false;
+	castAsBool.forEach(function (prop) {
+		var value = nconf.get(prop);
+		if (value) {
+			nconf.set(prop, typeof value === 'boolean' ? value : String(value).toLowerCase() === 'true');
+		}
+	});
+	nconf.stores.env.readOnly = true;
+}
+
+function versionCheck() {
+	var version = process.version.slice(1);
+	var range = pkg.engines.node;
+	var semver = require('semver');
+	var compatible = semver.satisfies(version, range);
+
+	if (!compatible) {
+		winston.warn('Your version of Node.js is too outdated for NodeBB. Please update your version of Node.js.');
+		winston.warn('Recommended ' + range.green + ', '.reset + version.yellow + ' provided\n'.reset);
+	}
+}
+
+exports.setupWinston = setupWinston;
+exports.loadConfig = loadConfig;
+exports.versionCheck = versionCheck;