6 var tty = require('tty');
8 var util = require('util');
10 * This is the Node.js implementation of `debug()`.
16 exports.formatArgs = formatArgs;
19 exports.useColors = useColors;
24 exports.colors = [6, 2, 3, 4, 5, 1];
27 // Optional dependency (as in, doesn't need to be installed, NOT like optionalDependencies in package.json)
28 // eslint-disable-next-line import/no-extraneous-dependencies
29 var supportsColor = require('supports-color');
31 if (supportsColor && (supportsColor.stderr || supportsColor).level >= 2) {
32 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];
34 } catch (error) {} // Swallow - we only care if `supports-color` is available; it doesn't have to be.
37 * Build up the default `inspectOpts` object from the environment variables.
39 * $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js
43 exports.inspectOpts = Object.keys(process.env).filter(function (key) {
44 return /^debug_/i.test(key);
45 }).reduce(function (obj, key) {
47 var prop = key.substring(6).toLowerCase().replace(/_([a-z])/g, function (_, k) {
48 return k.toUpperCase();
49 }); // Coerce string value into JS value
51 var val = process.env[key];
53 if (/^(yes|on|true|enabled)$/i.test(val)) {
55 } else if (/^(no|off|false|disabled)$/i.test(val)) {
57 } else if (val === 'null') {
67 * Is stdout a TTY? Colored output is enabled when `true`.
70 function useColors() {
71 return 'colors' in exports.inspectOpts ? Boolean(exports.inspectOpts.colors) : tty.isatty(process.stderr.fd);
74 * Adds ANSI color escape codes if enabled.
80 function formatArgs(args) {
81 var name = this.namespace,
82 useColors = this.useColors;
86 var colorCode = "\x1B[3" + (c < 8 ? c : '8;5;' + c);
87 var prefix = " ".concat(colorCode, ";1m").concat(name, " \x1B[0m");
88 args[0] = prefix + args[0].split('\n').join('\n' + prefix);
89 args.push(colorCode + 'm+' + module.exports.humanize(this.diff) + "\x1B[0m");
91 args[0] = getDate() + name + ' ' + args[0];
96 if (exports.inspectOpts.hideDate) {
100 return new Date().toISOString() + ' ';
103 * Invokes `util.format()` with the specified arguments and writes to stderr.
108 return process.stderr.write(util.format.apply(util, arguments) + '\n');
113 * @param {String} namespaces
118 function save(namespaces) {
120 process.env.DEBUG = namespaces;
122 // If you set a process.env field to null or undefined, it gets cast to the
123 // string 'null' or 'undefined'. Just delete instead.
124 delete process.env.DEBUG;
130 * @return {String} returns the previously persisted debug modes
136 return process.env.DEBUG;
139 * Init logic for `debug` instances.
141 * Create a new `inspectOpts` object in case `useColors` is set
142 * differently for a particular `debug` instance.
146 function init(debug) {
147 debug.inspectOpts = {};
148 var keys = Object.keys(exports.inspectOpts);
150 for (var i = 0; i < keys.length; i++) {
151 debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]];
155 module.exports = require('./common')(exports);
156 var formatters = module.exports.formatters;
158 * Map %o to `util.inspect()`, all on a single line.
161 formatters.o = function (v) {
162 this.inspectOpts.colors = this.useColors;
163 return util.inspect(v, this.inspectOpts)
165 .map(function (str) { return str.trim(); })
169 * Map %O to `util.inspect()`, allowing multiple lines if needed.
173 formatters.O = function (v) {
174 this.inspectOpts.colors = this.useColors;
175 return util.inspect(v, this.inspectOpts);