cmdline parameter parsing improved

uses license classes to write LICENSE file
config.m4 and *.dsp file are only written if their platform is supported

scripts/ext_skel_ng/ext_skel_ng.php

@@ -2,26 +2,52 @@
   require_once "extension_parser.php";
 	require_once "System.php";
 
-  $filename = isset($_SERVER["argv"][1]) ? $_SERVER["argv"][1] : "extension.xml";
+	// parse command line arguments
+	if (isset($_SERVER['argv'][1])) {
+		$filename = $_SERVER["argv"][1];
+		echo "using '$filename' as specification file\n";
+	} else {
+		$filename = "extension.xml";
+		echo "using default file '$filename' as specification file\n";
+	}
 
-  $ext = &new extension_parser(fopen($filename, "r"));
+	// open specification file
+	$fp = fopen($filename, "r");
+	if (!is_resource($fp)) {
+		error_log("can't read specification file '$filename'");
+		exit;
+	}
 
+	// parse specification file
+  $ext = new extension_parser($fp);
+	fclose($fp);
+
+	// purge and create extension directory
   System::rm("-rf {$ext->name}");
   mkdir($ext->name);
 
+	// write LICENSE file
+	$ext->license->write_license_file("{$ext->name}/LICENSE");
+
   // generate code
   $ext->write_header_file();
   $ext->write_code_file();
-  if(isset($ext->logo)) {
+  if (isset($ext->logo)) {
     $fp = fopen("{$ext->name}/{$ext->name}_logo.h", "w");
     fwrite($fp, $ext->logo->h_code());
     fclose($fp);
-    $ext->logo->h_code();
   }
 
-  // generate project files for configure and ms dev studio
-  $ext->write_config_m4();
-  $ext->write_ms_devstudio_dsp();
+  // generate project files for configure (unices and similar platforms like cygwin)
+	if ($ext->platform === "all" || in_array("unix", $ext->platform)) {
+    $ext->write_config_m4();
+	}
+
+  // generate project files for Windows platform (VisualStudio/C++ V6)
+	if ($ext->platform === "all" || in_array("win32", $ext->platform)) {
+    $ext->write_ms_devstudio_dsp();
+	}
 
+	// generate DocBook XML documantation for PHP manual
   $ext->generate_documentation();
 ?>