Merge pull request #17 from ashur/feature/install

added 'install' command (fixes #16)

lib/commands/install.php

@@ -0,0 +1,51 @@
+<?php
+
+use Huxtable\CLI\Command;
+use Huxtable\Core\File;
+
+/**
+ * @name			install
+ * @description		Symlink 'pug' to a convenient path
+ * @usage			install <dir>
+ */
+$command = new Command( 'install', 'Symlink \'pug\' to a convenient path', function( $dir )
+{
+	$pathSource = dirname( dirname( __DIR__ ) ) . '/bin/pug';
+
+	try
+	{
+		$destinationDirectory = new File\Directory( $dir );
+
+		if( !$destinationDirectory->exists() )
+		{
+			throw new \Exception( "Invalid location: '{$dir}' does not exist" );
+		}
+	}
+	catch( \Exception $e )
+	{
+		throw new Command\CommandInvokedException( $e->getMessage(), 1 );
+	}
+
+	if( !$destinationDirectory->isWritable() )
+	{
+		throw new Command\CommandInvokedException( "Invalid location: You do not have permission to write to '{$destinationDirectory}'" );
+	}
+
+	$target = $destinationDirectory->child( 'pug' );
+	$source = new File\File( $pathSource );
+
+	if( !$source->exists() )
+	{
+		throw new Command\CommandInvokedException( "Invalid source: '{$source}' not found", 1 );
+	}
+
+	if( $target->exists() || is_link( $target->getPathname() ) )
+	{
+		throw new Command\CommandInvokedException( "Invalid target: '{$target}' already exists", 1 );
+	}
+
+	symlink( $source, $target );
+	echo "Linked to '{$target}'" . PHP_EOL;
+});
+
+return $command;