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249 lines
5.9 KiB
JavaScript
249 lines
5.9 KiB
JavaScript
5 years ago
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/**
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* Module dependencies.
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*/
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var tty = require('tty');
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var util = require('util');
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/**
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* This is the Node.js implementation of `debug()`.
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*
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* Expose `debug()` as the module.
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*/
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exports = module.exports = require('./debug');
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exports.init = init;
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exports.log = log;
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exports.formatArgs = formatArgs;
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exports.save = save;
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exports.load = load;
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exports.useColors = useColors;
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/**
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* Colors.
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*/
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exports.colors = [6, 2, 3, 4, 5, 1];
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/**
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* Build up the default `inspectOpts` object from the environment variables.
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*
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* $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js
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*/
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exports.inspectOpts = Object.keys(process.env).filter(function (key) {
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return /^debug_/i.test(key);
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}).reduce(function (obj, key) {
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// camel-case
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var prop = key
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.substring(6)
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.toLowerCase()
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.replace(/_([a-z])/g, function (_, k) { return k.toUpperCase() });
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// coerce string value into JS value
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var val = process.env[key];
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if (/^(yes|on|true|enabled)$/i.test(val)) val = true;
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else if (/^(no|off|false|disabled)$/i.test(val)) val = false;
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else if (val === 'null') val = null;
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else val = Number(val);
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obj[prop] = val;
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return obj;
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}, {});
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/**
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* The file descriptor to write the `debug()` calls to.
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* Set the `DEBUG_FD` env variable to override with another value. i.e.:
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*
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* $ DEBUG_FD=3 node script.js 3>debug.log
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*/
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var fd = parseInt(process.env.DEBUG_FD, 10) || 2;
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if (1 !== fd && 2 !== fd) {
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util.deprecate(function(){}, 'except for stderr(2) and stdout(1), any other usage of DEBUG_FD is deprecated. Override debug.log if you want to use a different log function (https://git.io/debug_fd)')()
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}
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var stream = 1 === fd ? process.stdout :
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2 === fd ? process.stderr :
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createWritableStdioStream(fd);
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/**
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* Is stdout a TTY? Colored output is enabled when `true`.
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*/
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function useColors() {
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return 'colors' in exports.inspectOpts
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? Boolean(exports.inspectOpts.colors)
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: tty.isatty(fd);
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}
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/**
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* Map %o to `util.inspect()`, all on a single line.
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*/
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exports.formatters.o = function(v) {
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this.inspectOpts.colors = this.useColors;
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return util.inspect(v, this.inspectOpts)
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.split('\n').map(function(str) {
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return str.trim()
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}).join(' ');
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};
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/**
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* Map %o to `util.inspect()`, allowing multiple lines if needed.
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*/
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exports.formatters.O = function(v) {
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this.inspectOpts.colors = this.useColors;
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return util.inspect(v, this.inspectOpts);
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};
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/**
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* Adds ANSI color escape codes if enabled.
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*
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* @api public
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*/
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function formatArgs(args) {
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var name = this.namespace;
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var useColors = this.useColors;
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if (useColors) {
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var c = this.color;
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var prefix = ' \u001b[3' + c + ';1m' + name + ' ' + '\u001b[0m';
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args[0] = prefix + args[0].split('\n').join('\n' + prefix);
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args.push('\u001b[3' + c + 'm+' + exports.humanize(this.diff) + '\u001b[0m');
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} else {
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args[0] = new Date().toUTCString()
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+ ' ' + name + ' ' + args[0];
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}
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}
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/**
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* Invokes `util.format()` with the specified arguments and writes to `stream`.
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*/
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function log() {
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return stream.write(util.format.apply(util, arguments) + '\n');
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}
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/**
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* Save `namespaces`.
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*
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* @param {String} namespaces
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* @api private
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*/
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function save(namespaces) {
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if (null == namespaces) {
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// If you set a process.env field to null or undefined, it gets cast to the
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// string 'null' or 'undefined'. Just delete instead.
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delete process.env.DEBUG;
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} else {
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process.env.DEBUG = namespaces;
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}
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}
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/**
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* Load `namespaces`.
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*
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* @return {String} returns the previously persisted debug modes
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* @api private
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*/
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function load() {
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return process.env.DEBUG;
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}
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/**
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* Copied from `node/src/node.js`.
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*
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* XXX: It's lame that node doesn't expose this API out-of-the-box. It also
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* relies on the undocumented `tty_wrap.guessHandleType()` which is also lame.
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*/
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function createWritableStdioStream (fd) {
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var stream;
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var tty_wrap = process.binding('tty_wrap');
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// Note stream._type is used for test-module-load-list.js
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switch (tty_wrap.guessHandleType(fd)) {
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case 'TTY':
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stream = new tty.WriteStream(fd);
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stream._type = 'tty';
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// Hack to have stream not keep the event loop alive.
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// See https://github.com/joyent/node/issues/1726
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if (stream._handle && stream._handle.unref) {
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stream._handle.unref();
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}
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break;
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case 'FILE':
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var fs = require('fs');
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stream = new fs.SyncWriteStream(fd, { autoClose: false });
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stream._type = 'fs';
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break;
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case 'PIPE':
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case 'TCP':
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var net = require('net');
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stream = new net.Socket({
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fd: fd,
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readable: false,
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writable: true
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});
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// FIXME Should probably have an option in net.Socket to create a
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// stream from an existing fd which is writable only. But for now
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// we'll just add this hack and set the `readable` member to false.
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// Test: ./node test/fixtures/echo.js < /etc/passwd
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stream.readable = false;
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stream.read = null;
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stream._type = 'pipe';
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// FIXME Hack to have stream not keep the event loop alive.
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// See https://github.com/joyent/node/issues/1726
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if (stream._handle && stream._handle.unref) {
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stream._handle.unref();
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}
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break;
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default:
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// Probably an error on in uv_guess_handle()
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throw new Error('Implement me. Unknown stream file type!');
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}
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// For supporting legacy API we put the FD here.
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stream.fd = fd;
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stream._isStdio = true;
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return stream;
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}
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/**
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* Init logic for `debug` instances.
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*
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* Create a new `inspectOpts` object in case `useColors` is set
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* differently for a particular `debug` instance.
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*/
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function init (debug) {
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debug.inspectOpts = {};
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var keys = Object.keys(exports.inspectOpts);
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for (var i = 0; i < keys.length; i++) {
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debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]];
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}
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}
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/**
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* Enable namespaces listed in `process.env.DEBUG` initially.
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*/
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exports.enable(load());
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