console.js

/*

To print line numbers and files in NodeJS where the console.* functions are called.

add `require('./console.js');` to the begining of your app

run the app with environment variable like so: `CONSOLE_LINES=true`

*/

if (!process.env.CONSOLE_LINES) {
    return;
}

var path = require('path');

Object.defineProperty(global, '__stack', {
    get: function() {
        var orig = Error.prepareStackTrace;
        Error.prepareStackTrace = function(_, stack) {
            return stack;
        };
        var err = new Error;
        Error.captureStackTrace(err, arguments.callee);
        var stack = err.stack;
        Error.prepareStackTrace = orig;
        return stack;
    }
});

Object.defineProperty(global, '__line', {
    get: function() {
        return __stack[1].getLineNumber();
    }
});

['error', 'log', 'info', 'warn', 'trace'].forEach(function(name) {


    var fn = console[name];


    console[name] = function() {

        if (console._trace || (console.traceOptions && console.traceOptions.always)) {


            if (Buffer.isBuffer(arguments[0])) {


                arguments[0] = arguments[0].inspect();


            } else if (typeof arguments[0] === 'object') {


                arguments[0] = JSON.stringify(arguments[0], null, '  ');


            }


            var pad = (arguments[0] && !console.traceOptions.right || !isatty ? ' ' : '');


            arguments[0] = console.traceFormat(__stack[1], name) + pad + arguments[0];


        }

        arguments[0] = '[' + __stack[1].getFileName().replace(__dirname+path.sep, '') + ':' + __stack[1].getLineNumber() + '] ' + arguments[0];

        console._trace = false;


        return fn.apply(this, arguments);


    };


});