Loader helper

Author: piotrooo

lib/Psf/Helpers/Loader.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * Loader
+ *
+ * @author Piotr Olaszewski
+ */
+namespace Psf\Helpers;
+
+use Psf\Output\Writer;
+
+class Loader
+{
+    /**
+     * @var Writer
+     */
+    private $_output;
+    private $_charSequence = array('|', '/', '-', '\\', '|');
+    private $_currentSequenceId = 0;
+    private $_loaderText = 'Loading ';
+
+    public function initialize(Writer $output)
+    {
+        $this->_output = $output;
+    }
+
+    public function start()
+    {
+        if ($this->_currentSequenceId == sizeof($this->_charSequence)) {
+            $this->_currentSequenceId = 0;
+        }
+        $char = $this->_charSequence[$this->_currentSequenceId];
+        $this->_output->writeMessage(Writer::ANSI_CLEAR_LINE . $this->_loaderText . $char, 1, Writer::CR);
+        $this->_currentSequenceId++;
+    }
+
+    public function setCharSequence($charSequence)
+    {
+        $this->_charSequence = $charSequence;
+        $this->setCurrentSequenceId(0);
+    }
+
+    public function setCurrentSequenceId($currentSequenceId)
+    {
+        $this->_currentSequenceId = $currentSequenceId;
+    }
+
+    public function setLoaderText($loaderText)
+    {
+        $this->_loaderText = $loaderText;
+    }
+}

lib/Psf/Output/Writer.php

@@ -17,6 +17,7 @@ class Writer
     const VERBOSITY_VERBOSE = 2;
     const LF = PHP_EOL;
     const CR = "\r";
+    const ANSI_CLEAR_LINE = "\033[K";
 
     private $_streamHandle;
     private $_formatters = array();