Hide Logs

log-only.js

if (process.env.LOG_ONLY) {
    var chalk = require('chalk');
    var MOVE_LEFT = new Buffer('1b5b3130303044', 'hex').toString();
    var CLEAR_LINE = new Buffer('1b5b304b', 'hex').toString();
    var hiddenCount = 0;
    Object.keys(console).forEach(methodName => {
        var method = console[methodName];

        if (method != console.Console) {
            console[methodName] = function() {
                var file = getCallLocation().file;
                var modulePath = getModulePath(file)
                if (shouldLog(modulePath)) {
                    if (hiddenCount) {
                        process.stdout.write('\n');
                        hiddenCount = 0;
                    }
                    method.apply(console, arguments);
                } else {
                    process.stdout.write(MOVE_LEFT + CLEAR_LINE + chalk.gray.dim(`${++hiddenCount} hidden log${hiddenCount > 1 ? 's' : ''}`));
                }
            }
        }
    })

    var minimatch = require('minimatch');
    var pattern = minimatch.makeRe(process.env.LOG_ONLY);
    function shouldLog(modulePath) {
        return pattern.test(modulePath);
    }

    var path = require('path');
    function getModulePath(file) {
        var node_modules = '/node_modules/';
        var location = file.lastIndexOf(node_modules);

        if (location !== -1) {
            return file.slice(location+node_modules.length);
        }

        return file.replace(process.cwd(), path.basename(process.cwd()));
    }

    function getCallLocation(depth) {
        var pst, stack, file, frame;

        pst = Error.prepareStackTrace;
        Error.prepareStackTrace = function (_, stack) {
            Error.prepareStackTrace = pst;
            return stack;
        };

        stack = (new Error()).stack;
        depth = !depth || isNaN(depth) ? 1 : (depth > stack.length - 2 ? stack.length - 2 : depth);
        stack = stack.slice(depth + 1);

        do {
            frame = stack.shift();
            file = frame && frame.getFileName();
        } while (stack.length && file === 'module.js');

        return { file };
    }
}