“use strict”;

/**

* Module dependencies.
*/

var tty = require('tty');

var util = require('util'); /**

* This is the Node.js implementation of `debug()`.
*/

exports.init = init; exports.log = log; exports.formatArgs = formatArgs; exports.save = save; exports.load = load; exports.useColors = useColors; /**

* Colors.
*/

exports.colors = [6, 2, 3, 4, 5, 1];

try {

// Optional dependency (as in, doesn't need to be installed, NOT like optionalDependencies in package.json)
// eslint-disable-next-line import/no-extraneous-dependencies
var supportsColor = require('supports-color');

if (supportsColor && (supportsColor.stderr || supportsColor).level >= 2) {
  exports.colors = [20, 21, 26, 27, 32, 33, 38, 39, 40, 41, 42, 43, 44, 45, 56, 57, 62, 63, 68, 69, 74, 75, 76, 77, 78, 79, 80, 81, 92, 93, 98, 99, 112, 113, 128, 129, 134, 135, 148, 149, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 178, 179, 184, 185, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 214, 215, 220, 221];
}

} catch (error) {} // Swallow - we only care if `supports-color` is available; it doesn't have to be.

/**

* Build up the default `inspectOpts` object from the environment variables.
*
*   $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js
*/

exports.inspectOpts = Object.keys(process.env).filter(function (key) {

return /^debug_/i.test(key);

}).reduce(function (obj, key) {

// Camel-case
var prop = key.substring(6).toLowerCase().replace(/_([a-z])/g, function (_, k) {
  return k.toUpperCase();
}); // Coerce string value into JS value

var val = process.env[key];

if (/^(yes|on|true|enabled)$/i.test(val)) {
  val = true;
} else if (/^(no|off|false|disabled)$/i.test(val)) {
  val = false;
} else if (val === 'null') {
  val = null;
} else {
  val = Number(val);
}

obj[prop] = val;
return obj;

}, {}); /**

* Is stdout a TTY? Colored output is enabled when `true`.
*/

function useColors() {

return 'colors' in exports.inspectOpts ? Boolean(exports.inspectOpts.colors) : tty.isatty(process.stderr.fd);

} /**

* Adds ANSI color escape codes if enabled.
*
* @api public
*/

function formatArgs(args) {

var name = this.namespace,
    useColors = this.useColors;

if (useColors) {
  var c = this.color;
  var colorCode = "\x1B[3" + (c < 8 ? c : '8;5;' + c);
  var prefix = "  ".concat(colorCode, ";1m").concat(name, " \x1B[0m");
  args[0] = prefix + args[0].split('\n').join('\n' + prefix);
  args.push(colorCode + 'm+' + module.exports.humanize(this.diff) + "\x1B[0m");
} else {
  args[0] = getDate() + name + ' ' + args[0];
}

}

function getDate() {

if (exports.inspectOpts.hideDate) {
  return '';
}

return new Date().toISOString() + ' ';

} /**

* Invokes `util.format()` with the specified arguments and writes to stderr.
*/

function log() {

return process.stderr.write(util.format.apply(util, arguments) + '\n');

} /**

* Save `namespaces`.
*
* @param {String} namespaces
* @api private
*/

function save(namespaces) {

if (namespaces) {
  process.env.DEBUG = namespaces;
} else {
  // If you set a process.env field to null or undefined, it gets cast to the
  // string 'null' or 'undefined'. Just delete instead.
  delete process.env.DEBUG;
}

} /**

* Load `namespaces`.
*
* @return {String} returns the previously persisted debug modes
* @api private
*/

function load() {

return process.env.DEBUG;

} /**

* Init logic for `debug` instances.
*
* Create a new `inspectOpts` object in case `useColors` is set
* differently for a particular `debug` instance.
*/

function init(debug) {

debug.inspectOpts = {};
var keys = Object.keys(exports.inspectOpts);

for (var i = 0; i < keys.length; i++) {
  debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]];
}

}

module.exports = require('./common')(exports); var formatters = module.exports.formatters; /**

* Map %o to `util.inspect()`, all on a single line.
*/

formatters.o = function (v) {

this.inspectOpts.colors = this.useColors;
return util.inspect(v, this.inspectOpts).replace(/\s*\n\s*/g, ' ');

}; /**

* Map %O to `util.inspect()`, allowing multiple lines if needed.
*/

formatters.O = function (v) {

this.inspectOpts.colors = this.useColors;
return util.inspect(v, this.inspectOpts);

};