MauroJr · June 21, 2017 14:37 · Jun 21, 2017
diff --git a/telnet-client.js b/telnet-client.js
@@ -0,0 +1,38 @@
+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;
+  };
+};