node.js (4339B)
1 /** 2 * Module dependencies. 3 */ 4 5 var tty = require('tty'); 6 var util = require('util'); 7 8 /** 9 * This is the Node.js implementation of `debug()`. 10 * 11 * Expose `debug()` as the module. 12 */ 13 14 exports = module.exports = require('./debug'); 15 exports.init = init; 16 exports.log = log; 17 exports.formatArgs = formatArgs; 18 exports.save = save; 19 exports.load = load; 20 exports.useColors = useColors; 21 22 /** 23 * Colors. 24 */ 25 26 exports.colors = [ 6, 2, 3, 4, 5, 1 ]; 27 28 try { 29 var supportsColor = require('supports-color'); 30 if (supportsColor && supportsColor.level >= 2) { 31 exports.colors = [ 32 20, 21, 26, 27, 32, 33, 38, 39, 40, 41, 42, 43, 44, 45, 56, 57, 62, 63, 68, 33 69, 74, 75, 76, 77, 78, 79, 80, 81, 92, 93, 98, 99, 112, 113, 128, 129, 134, 34 135, 148, 149, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 35 172, 173, 178, 179, 184, 185, 196, 197, 198, 199, 200, 201, 202, 203, 204, 36 205, 206, 207, 208, 209, 214, 215, 220, 221 37 ]; 38 } 39 } catch (err) { 40 // swallow - we only care if `supports-color` is available; it doesn't have to be. 41 } 42 43 /** 44 * Build up the default `inspectOpts` object from the environment variables. 45 * 46 * $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js 47 */ 48 49 exports.inspectOpts = Object.keys(process.env).filter(function (key) { 50 return /^debug_/i.test(key); 51 }).reduce(function (obj, key) { 52 // camel-case 53 var prop = key 54 .substring(6) 55 .toLowerCase() 56 .replace(/_([a-z])/g, function (_, k) { return k.toUpperCase() }); 57 58 // coerce string value into JS value 59 var val = process.env[key]; 60 if (/^(yes|on|true|enabled)$/i.test(val)) val = true; 61 else if (/^(no|off|false|disabled)$/i.test(val)) val = false; 62 else if (val === 'null') val = null; 63 else val = Number(val); 64 65 obj[prop] = val; 66 return obj; 67 }, {}); 68 69 /** 70 * Is stdout a TTY? Colored output is enabled when `true`. 71 */ 72 73 function useColors() { 74 return 'colors' in exports.inspectOpts 75 ? Boolean(exports.inspectOpts.colors) 76 : tty.isatty(process.stderr.fd); 77 } 78 79 /** 80 * Map %o to `util.inspect()`, all on a single line. 81 */ 82 83 exports.formatters.o = function(v) { 84 this.inspectOpts.colors = this.useColors; 85 return util.inspect(v, this.inspectOpts) 86 .split('\n').map(function(str) { 87 return str.trim() 88 }).join(' '); 89 }; 90 91 /** 92 * Map %o to `util.inspect()`, allowing multiple lines if needed. 93 */ 94 95 exports.formatters.O = function(v) { 96 this.inspectOpts.colors = this.useColors; 97 return util.inspect(v, this.inspectOpts); 98 }; 99 100 /** 101 * Adds ANSI color escape codes if enabled. 102 * 103 * @api public 104 */ 105 106 function formatArgs(args) { 107 var name = this.namespace; 108 var useColors = this.useColors; 109 110 if (useColors) { 111 var c = this.color; 112 var colorCode = '\u001b[3' + (c < 8 ? c : '8;5;' + c); 113 var prefix = ' ' + colorCode + ';1m' + name + ' ' + '\u001b[0m'; 114 115 args[0] = prefix + args[0].split('\n').join('\n' + prefix); 116 args.push(colorCode + 'm+' + exports.humanize(this.diff) + '\u001b[0m'); 117 } else { 118 args[0] = getDate() + name + ' ' + args[0]; 119 } 120 } 121 122 function getDate() { 123 if (exports.inspectOpts.hideDate) { 124 return ''; 125 } else { 126 return new Date().toISOString() + ' '; 127 } 128 } 129 130 /** 131 * Invokes `util.format()` with the specified arguments and writes to stderr. 132 */ 133 134 function log() { 135 return process.stderr.write(util.format.apply(util, arguments) + '\n'); 136 } 137 138 /** 139 * Save `namespaces`. 140 * 141 * @param {String} namespaces 142 * @api private 143 */ 144 145 function save(namespaces) { 146 if (null == namespaces) { 147 // If you set a process.env field to null or undefined, it gets cast to the 148 // string 'null' or 'undefined'. Just delete instead. 149 delete process.env.DEBUG; 150 } else { 151 process.env.DEBUG = namespaces; 152 } 153 } 154 155 /** 156 * Load `namespaces`. 157 * 158 * @return {String} returns the previously persisted debug modes 159 * @api private 160 */ 161 162 function load() { 163 return process.env.DEBUG; 164 } 165 166 /** 167 * Init logic for `debug` instances. 168 * 169 * Create a new `inspectOpts` object in case `useColors` is set 170 * differently for a particular `debug` instance. 171 */ 172 173 function init (debug) { 174 debug.inspectOpts = {}; 175 176 var keys = Object.keys(exports.inspectOpts); 177 for (var i = 0; i < keys.length; i++) { 178 debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]]; 179 } 180 } 181 182 /** 183 * Enable namespaces listed in `process.env.DEBUG` initially. 184 */ 185 186 exports.enable(load());