Created
June 21, 2017 14:37
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| var _ = require('lodash'), | |
| util = require('util'); | |
| // intercept stdout, passes thru callback | |
| // also pass console.error thru stdout so it goes to callback too | |
| // (stdout.write and stderr.write are both refs to the same stream.write function) | |
| // returns an unhook() function, call when done intercepting | |
| module.exports = function interceptStdout(callback) { | |
| var old_stdout_write = process.stdout.write, | |
| old_console_error = console.error; | |
| process.stdout.write = (function(write) { | |
| return function(string, encoding, fd) { | |
| var args = _.toArray(arguments); | |
| write.apply(process.stdout, args); | |
| // only intercept the string | |
| callback.call(callback, string); | |
| }; | |
| }(process.stdout.write)); | |
| console.error = (function(log) { | |
| return function() { | |
| var args = _.toArray(arguments); | |
| args.unshift('[ERROR]'); | |
| console.log.apply(console.log, args); | |
| // string here encapsulates all the args | |
| callback.call(callback, util.format(args)); | |
| }; | |
| }(console.error)); | |
| // puts back to original | |
| return function unhook() { | |
| process.stdout.write = old_stdout_write; | |
| console.error = old_console_error; | |
| }; | |
| }; |
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