as in any lib from CI framework, provide initialize(array())

* update README documentation usage
* provide initialize( $config = array() ) as any CI library
* use initialize for constructor defaults

Author: mckaygerhard

README.md

@@ -21,21 +21,18 @@ Download the library and extract it to `libraries` in your application.
 
 1. Copy the `application/libraries/ConfigWriter.php` file to `application/libraries/`
 2. Initialise the ConfigWriter library and include it in your controller or whatever. Example below:
-
-        public function myform()
-        {
+```
                 $this->load->library('ConfigWriter', 'config.php', 'configwriter');
                 $this->configwriter->write('index_page' , 'index2.php' );
-        }
-
+```
 If you checked your `applications/config/config.php` will see how the line `$config['index_page'] = 'index.php';`
 changed to `$config['index_page'] = 'index2.php';` magically!
 
 
 ## Configuration options
 
 There are some configuration options which you can pass to the library in an associative array when you
-performed in code  `$this->configwriter->init($config)` or by constructor like `$this->load->library('ConfigWriter', $config);`
+performed in code  `$this->configwriter->initialize($config)` or by constructor like `$this->load->library('ConfigWriter', $config);`
 
 * **file**: (string) This should be set to the file that you want to alter config array. It will default to `config.php`, each name will assume `applications/config/` as search path.
 * **variable_name** (string) : The variable name of the array  to update. It will default to `$config`.as in file of codeignoter in `config.php`.

application/libraries/ConfigWriter.php

@@ -100,46 +100,84 @@ class ConfigWriter {
     protected $_autoSave = true ;
 
 
+    // --------------------------------------------------------------------
+
     /**
-     * 
-     * @param string $config_file Asolute path to config file
-     * @param string $variable_name the name of the config varible to update
+     * CI Singleton
+     *
+     * @var object
+     */
+    protected $CI;
+
+    // --------------------------------------------------------------------
+
+    /**
+     * Class constructor
+     *
+     * Loads the calendar language file and sets the default time reference.
+     *
+     * @uses	CI_Lang::$is_loaded
+     *
+     * @param	array	$config	Calendar options
+     * @return	void
+     */
+    public function __construct($config = NULL) 
+    {
+
+	$this->CI =& get_instance();
+
+	empty($config) OR $this->initialize($config);
+
+	log_message('info', 'ConfigWriter Class Initialized');
+
+    }
+    
+    // --------------------------------------------------------------------
+
+    /**
+     * Initialize the user preferences
+     *
+     * Accepts an associative array as input, containing display preferences
+     *
+     * @param	array	config preferences
+     * @return	CI_Calendar
      */
-    public function __construct($config_file = NULL) 
+    public function initialize($config = array())
     {
         $this->_file = APPPATH .'config/config.php';
         $this->_autoSave = true ;
         $this->setVariableName('config');
-        if( is_array($config_file) )
+
+        if( is_array($config) )
         {
-            if (array_key_exists('file', $config_file))
-                $this->_file = APPPATH .'config/'.$config_file['file'];
-            if (array_key_exists('auto_save', $config_file))
-                $this->_autoSave = $config_file['auto_save'];
-            if (array_key_exists('variable_name', $config_file))
-                $this->setVariableName($config_file['variable_name'] );
+            if (array_key_exists('file', $config))
+                $this->_file = APPPATH .'config/'.$config['file'];
+            if (array_key_exists('auto_save', $config))
+                $this->_autoSave = $config['auto_save'];
+            if (array_key_exists('variable_name', $config))
+                $this->setVariableName($config['variable_name'] );
         }
         else
         {
-            if( isset($config_file) )
+            if( isset($config) )
                 $this->_file = APPPATH .'config/config.php';
             else
-                $this->_file = APPPATH .'config/'.$config_file;
+                $this->_file = APPPATH .'config/'.$config;
         }
         $this->_destinationFile = $this->_file ;
 
         if ( ! file_exists($this->_file))
         {
             //throw new Exception('Config Write Error: Config file doesnt exists ' . $this->_file);
             $this->_lastError = 'Config Write Error: Config file doesnt exists ' . $this->_file ;
-        
-            return ;
+            log_message('warning', 'ConfigWriter error: config file not exist, using default' . $this->_file);
+            $this->_file = APPPATH .'config/config.php';
+            return $this;
         }
-
         $this->_fileContent =  file_get_contents( $this->_file ) ;
-        
+        return $this;
     }
-    
+
 
     /**
      * Wite or update an item of the config array