@compodoc/compodoc/src/logger.ts

let log = require('fancy-log');
let c = require('chalk');
let pkg = require('../package.json');

enum LEVEL {
	INFO,
	DEBUG,
	ERROR,
	WARN
}

class Logger {

	public name;
	public logger;
	public version;
	public silent;

	constructor() {
		this.name = pkg.name;
		this.version = pkg.version;
		this.logger = log;
		this.silent = true;
	}

	public info(...args) {
		if (!this.silent) { return; }
		this.logger(
			this.format(LEVEL.INFO, ...args)
		);
	}

	public error(...args) {
		if (!this.silent) { return; }
		this.logger(
			this.format(LEVEL.ERROR, ...args)
        );
	}

	public warn(...args) {
		if (!this.silent) { return; }
		this.logger(
			this.format(LEVEL.WARN, ...args)
		);
	}

	public debug(...args) {
		if (!this.silent) { return; }
		this.logger(
			this.format(LEVEL.DEBUG, ...args)
		);
	}

	private format(level, ...args) {

		let pad = (s, l, z = '') => {
			return s + Array(Math.max(0, l - s.length + 1)).join(z);
		};

		let msg = args.join(' ');
		if (args.length > 1) {
			msg = `${pad(args.shift(), 15, ' ')}: ${args.join(' ')}`;
		}


		switch (level) {
			case LEVEL.INFO:
				msg = c.green(msg);
				break;

			case LEVEL.DEBUG:
				msg = c.cyan(msg);
				break;

			case LEVEL.WARN:
				msg = c.yellow(msg);
				break;

			case LEVEL.ERROR:
				msg = c.red(msg);
				break;
		}

		return [
			msg
		].join('');
	}
}

export let logger = new Logger();