CLI helper class

diff --git a/src/cli.php b/src/cli.php
new file mode 100644 (file)
index 0000000..ced4b0a
--- /dev/null
+++ b/src/cli.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace PFF;
+
+abstract class CLI
+{
+    private function getArgs()
+    {
+        global $argv;
+        if (is_array($argv))
+            return $argv;
+        if (@is_array($_SERVER['argv']))
+            return $_SERVER['argv'];
+        throw new Exception("Could not read command arguments (register_argc_argv=Off?)");
+    }
+
+    protected abstract function commands();
+
+    public function printUsage($name)
+    {
+        echo "Usage: $name <command> [parameter...]\n\n";
+        echo "Available commands:\n\n";
+
+        $cmds = $this->commands();
+
+        $max_len = 0;
+        foreach ($cmds as $cmd) {
+            list($key, $method, $description) = $cmd;
+            $max_len = max($max_len, strlen($key));
+        }
+
+        $pad = floor(($max_len + 11) / 8) * 8;
+        foreach ($cmds as $cmd) {
+            list($key, $method, $description) = $cmd;
+            echo "    ".str_pad($key, $pad).$description."\n";
+        }
+        echo "\n";
+    }
+
+    public function execute()
+    {
+        $args = $this->getArgs();
+
+        if (count($args) <= 1) {
+            $this->printUsage($args[0]);
+            return 1;
+        }
+
+        $command = $args[1];
+        $command_args = array_slice($args, 2);
+
+        foreach ($this->commands() as $cmd) {
+            list($key, $method, $description) = $cmd;
+            if ($key === $command) {
+                if (method_exists($this, $method)) {
+                    return call_user_func_array(array($this, $method), $command_args);
+                } else {
+                    echo "Method $method is not defined.\n";
+                    return 1;
+                }
+            }
+        }
+
+        echo "Unknown command.\n";
+        return 1;
+    }
+
+    public static function run()
+    {
+        if (php_sapi_name() === 'cli') {
+            $cli = new static;
+            $code = $cli->execute();
+            exit($code);
+        }
+    }
+}
+