diff options
Diffstat (limited to 'node_modules/debug/src/node.js')
-rw-r--r-- | node_modules/debug/src/node.js | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/node_modules/debug/src/node.js b/node_modules/debug/src/node.js new file mode 100644 index 000000000..4fa564b0d --- /dev/null +++ b/node_modules/debug/src/node.js @@ -0,0 +1,241 @@ +/** + * Module dependencies. + */ + +var tty = require('tty'); +var util = require('util'); + +/** + * This is the Node.js implementation of `debug()`. + * + * Expose `debug()` as the module. + */ + +exports = module.exports = require('./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]; + +/** + * 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])/, 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; +}, {}); + +/** + * The file descriptor to write the `debug()` calls to. + * Set the `DEBUG_FD` env variable to override with another value. i.e.: + * + * $ DEBUG_FD=3 node script.js 3>debug.log + */ + +var fd = parseInt(process.env.DEBUG_FD, 10) || 2; + +if (1 !== fd && 2 !== fd) { + 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)')() +} + +var stream = 1 === fd ? process.stdout : + 2 === fd ? process.stderr : + createWritableStdioStream(fd); + +/** + * Is stdout a TTY? Colored output is enabled when `true`. + */ + +function useColors() { + return 'colors' in exports.inspectOpts + ? Boolean(exports.inspectOpts.colors) + : tty.isatty(fd); +} + +/** + * Map %o to `util.inspect()`, all on a single line. + */ + +exports.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. + */ + +exports.formatters.O = function(v) { + this.inspectOpts.colors = this.useColors; + return util.inspect(v, this.inspectOpts); +}; + +/** + * Adds ANSI color escape codes if enabled. + * + * @api public + */ + +function formatArgs(args) { + var name = this.namespace; + var useColors = this.useColors; + + if (useColors) { + var c = this.color; + var prefix = ' \u001b[3' + c + ';1m' + name + ' ' + '\u001b[0m'; + + args[0] = prefix + args[0].split('\n').join('\n' + prefix); + args.push('\u001b[3' + c + 'm+' + exports.humanize(this.diff) + '\u001b[0m'); + } else { + args[0] = new Date().toUTCString() + + ' ' + name + ' ' + args[0]; + } +} + +/** + * Invokes `util.format()` with the specified arguments and writes to `stream`. + */ + +function log() { + return stream.write(util.format.apply(util, arguments) + '\n'); +} + +/** + * Save `namespaces`. + * + * @param {String} namespaces + * @api private + */ + +function save(namespaces) { + if (null == namespaces) { + // 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; + } else { + process.env.DEBUG = namespaces; + } +} + +/** + * Load `namespaces`. + * + * @return {String} returns the previously persisted debug modes + * @api private + */ + +function load() { + return process.env.DEBUG; +} + +/** + * Copied from `node/src/node.js`. + * + * XXX: It's lame that node doesn't expose this API out-of-the-box. It also + * relies on the undocumented `tty_wrap.guessHandleType()` which is also lame. + */ + +function createWritableStdioStream (fd) { + var stream; + var tty_wrap = process.binding('tty_wrap'); + + // Note stream._type is used for test-module-load-list.js + + switch (tty_wrap.guessHandleType(fd)) { + case 'TTY': + stream = new tty.WriteStream(fd); + stream._type = 'tty'; + + // Hack to have stream not keep the event loop alive. + // See https://github.com/joyent/node/issues/1726 + if (stream._handle && stream._handle.unref) { + stream._handle.unref(); + } + break; + + case 'FILE': + var fs = require('fs'); + stream = new fs.SyncWriteStream(fd, { autoClose: false }); + stream._type = 'fs'; + break; + + case 'PIPE': + case 'TCP': + var net = require('net'); + stream = new net.Socket({ + fd: fd, + readable: false, + writable: true + }); + + // FIXME Should probably have an option in net.Socket to create a + // stream from an existing fd which is writable only. But for now + // we'll just add this hack and set the `readable` member to false. + // Test: ./node test/fixtures/echo.js < /etc/passwd + stream.readable = false; + stream.read = null; + stream._type = 'pipe'; + + // FIXME Hack to have stream not keep the event loop alive. + // See https://github.com/joyent/node/issues/1726 + if (stream._handle && stream._handle.unref) { + stream._handle.unref(); + } + break; + + default: + // Probably an error on in uv_guess_handle() + throw new Error('Implement me. Unknown stream file type!'); + } + + // For supporting legacy API we put the FD here. + stream.fd = fd; + + stream._isStdio = true; + + return stream; +} + +/** + * 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 = util._extend({}, exports.inspectOpts); +} + +/** + * Enable namespaces listed in `process.env.DEBUG` initially. + */ + +exports.enable(load()); |