const debug = require('debug') const fs = require('fs') const util = require('util') const tty = require('tty') /* Thumbsup uses the package for logging. It supports two main ways of logging: 1. when --log is not specified - This ignores all detailed logging calls - It simply renders progress using Listr on - Warning and error are sent to in the output folder for troubleshooting 2. when --log is specified - This switches Listr to text mode, e.g. "Task XYZ [completed]" - It renders log messages to - The logging level can be configured between info|debug|trace - Warnings and errors are always shown, because level is > info|debug|trace - is not created by default - You can always redirect or tee the output to a file if needed If --log is not specified, but the output doesn't support ANSI (e.g. non-TTY terminal, or file redirection) then the mode is automatically switched to "--log info" */ exports.init = (logLevel, logFile) => { // if the output doesn't support ANSI codes (e.g. pipe, redirect to file) // then switch to full-text mode, because Listr's output won't make much sense if (logLevel === 'default' && !tty.isatty(process.stdout.fd)) { logLevel = 'info' } // Configure the loggers if (logLevel === 'default') { configureDefaultMode(logFile) } else { configureDebugMode(logLevel) } } /* The package repeats the date + prefix for every log line, but only when using colors This fix adds the same behaviour in non-color mode It's important so the log files are easy to grep */ function overrideDebugFormat () { debug.formatArgs = function (args) { const prefix = new Date().toISOString() + ' ' + this.namespace + ' ' args[0] = prefix + args[0].split('\n').join('\n' + prefix) } } /* If --log is not specified, we won't show any detailed log on stdout Instead we send all errors to a file for troubleshooting */ function configureDefaultMode (logFile) { const stream = fs.createWriteStream(logFile, { flags: 'a' }) overrideDebugFormat() debug.enable('thumbsup:error,thumbsup:warn') debug.useColors = () => false debug.log = function () { const line = util.format.apply(util, arguments) + '\n' stream.write(line) } } /* --log mode configuration */ function configureDebugMode (logLevel) { // because Listr logs to stdout (not configurable), make debug() do the same // otherwise file redirection gets very confusing debug.log = function () { const line = util.format.apply(util, arguments) + '\n' process.stdout.write(line) } // TTY-related configuration const supportsANSI = tty.isatty(process.stdout.fd) debug.useColors = () => supportsANSI if (!supportsANSI) { overrideDebugFormat() } // enable the right log levels if (logLevel === 'trace') debug.enable('*') if (logLevel === 'debug') debug.enable('thumbsup:error,thumbsup:warn,thumbsup:info,thumbsup:debug') if (logLevel === 'info') debug.enable('thumbsup:error,thumbsup:warn,thumbsup:info') // capture any additional console.log() calls, including Listr task updates console.log = require('debug')('thumbsup:info') console.info = require('debug')('thumbsup:info') console.warn = require('debug')('thumbsup:warn') console.error = require('debug')('thumbsup:error') }