Throw exception if the source file unreadable

Author: weynhamz

PHPCtags.class.php

@@ -20,6 +20,22 @@ public function __construct()
         $this->mParser = new PHPParser_Parser(new PHPParser_Lexer);
     }
 
+    public function setMFile($file) {
+        if(empty($file)) {
+            throw new PHPCtagsException('No File specified.');
+        }
+
+        if(!file_exists($file)) {
+            throw new PHPCtagsException('Warning: cannot open source file "' . $file . '" : No such file');
+        }
+
+        if(!is_readable($file)) {
+            throw new PHPCtagsException('Warning: cannot open source file "' . $file . '" : File is not readable');
+        }
+
+        $this->mFile = realpath($file);
+    }
+
     public static function getMKinds()
     {
         return self::$mKinds;
@@ -225,9 +241,14 @@ private function render($structs, $options)
 
     public function export($file, $options)
     {
-        //@todo Check for existence
-        $this->mFile = $file;
+        $this->setMFile($file);
         $structs = $this->struct($this->mParser->parse(file_get_contents($this->mFile)), TRUE);
         echo $this->render($structs, $options);
     }
 }
+
+class PHPCtagsException extends Exception {
+    public function __toString() {
+        return "PHPCtags: {$this->message}\n";
+    }
+}

phpctags

@@ -35,7 +35,7 @@ EOF;
     exit;
 }
 
-$file = realpath(array_pop($argv));
+$file = array_pop($argv);
 
 if(!isset($options['excmd']))
     $options['excmd'] = 'pattern';
@@ -47,5 +47,9 @@ if(!isset($options['fields'])) {
     $options['fields'] = str_split($options['fields']);
 }
 
-$ctags = new PHPCtags();
-$ctags->export($file, $options);
+try {
+    $ctags = new PHPCtags();
+    $ctags->export($file, $options);
+} catch (Exception $e) {
+    die("phpctags: {$e->getMessage()}");
+}