Support piping to STDIN

Author: clue

examples/stdin-codes.php

@@ -1,5 +1,14 @@
 <?php
 
+// this example prints anything you type on STDIN to STDOUT
+// control codes will be given as their hex values for easier inspection.
+// also try this out with special keys on your keyboard:
+// $ php stdin-codes.php
+//
+// you can also pipe the output of other commands into this to see any control
+// codes like this:
+// $ phpunit --color=always | php stdin-codes.php
+
 use React\Stream\Stream;
 use React\EventLoop\Factory;
 use Clue\React\Term\ControlCodeParser;
@@ -8,8 +17,10 @@
 
 $loop = Factory::create();
 
-// Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
-shell_exec('stty -icanon -echo');
+if (function_exists('posix_isatty') && posix_isatty(STDIN)) {
+    // Disable icanon (so we can fread each keypress) and echo (we'll do echoing here instead)
+    shell_exec('stty -icanon -echo');
+}
 
 // process control codes from STDIN
 $stdin = new Stream(STDIN, $loop);