More sophisticated CLI example using clue/commander

Author: clue

README.md

@@ -564,3 +564,8 @@ MIT
 
 * If you want to learn more about processing streams of data, refer to the documentation of
   the underlying [react/stream](https://github.com/reactphp/stream) component.
+* If you build an interactive CLI tool that reads a command line from STDIN, you
+  may want to use [clue/arguments](https://github.com/clue/php-arguments) in
+  order to split this string up into its individual arguments and then use
+  [clue/commander](https://github.com/clue/php-commander) to route to registered
+  commands and their required arguments.

composer.json

@@ -22,5 +22,9 @@
     },
     "autoload": {
         "psr-4": { "Clue\\React\\Stdio\\": "src/" }
+    },
+    "require-dev": {
+        "clue/commander": "^1.2",
+        "clue/arguments": "^2.0"
     }
 }

examples/03-commander.php

@@ -0,0 +1,76 @@
+<?php
+
+use Clue\React\Stdio\Stdio;
+use Clue\Arguments;
+use Clue\Commander\Router;
+use Clue\Commander\NoRouteFoundException;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$loop = React\EventLoop\Factory::create();
+
+$stdio = new Stdio($loop);
+$readline = $stdio->getReadline();
+$readline->setPrompt('> ');
+
+// limit history to HISTSIZE env
+$limit = getenv('HISTSIZE');
+if ($limit === '' || $limit < 0) {
+    // empty string or negative value means unlimited
+    $readline->limitHistory(null);
+} elseif ($limit !== false) {
+    // apply any other value if given
+    $readline->limitHistory($limit);
+}
+
+// register all available commands and their arguments
+$router = new Router();
+$router->add('exit | quit', function() use ($stdio) {
+    $stdio->end();
+});
+$router->add('help', function () use ($stdio) {
+    $stdio->writeln('Use TAB-completion or use "exit"');
+});
+$router->add('(echo | print) <words>...', function (array $args) use ($stdio) {
+    $stdio->writeln(implode(' ', $args['words']));
+});
+$router->add('printf <format> <args>...', function (array $args) use ($stdio) {
+    $stdio->writeln(vsprintf($args['format'],$args['args']));
+});
+
+// autocomplete the following commands (at offset=0/1 only)
+$readline->setAutocomplete(function ($_, $offset) {
+    return $offset > 1 ? array() : array('exit', 'quit', 'help', 'echo', 'print', 'printf');
+});
+
+$stdio->writeln('Welcome to this interactive demo');
+
+// react to commands the user entered
+$stdio->on('line', function ($line) use ($router, $stdio, $readline) {
+    // add all lines from input to history
+    // skip empty line and duplicate of previous line
+    $all = $readline->listHistory();
+    if (trim($line) !== '' && $line !== end($all)) {
+        $readline->addHistory($line);
+    }
+
+    try {
+        $args = Arguments\split($line);
+    } catch (Arguments\UnclosedQuotesException $e) {
+        $stdio->writeln('Error: Invalid command syntax (unclosed quotes)');
+        return;
+    }
+
+    // skip empty lines
+    if (!$args) {
+        return;
+    }
+
+    try {
+        $router->handleArgs($args);
+    } catch (NoRouteFoundException $e) {
+        $stdio->writeln('Error: Invalid command usage');
+    }
+});
+
+$loop->run();