[NEW] Add ability to generate call graph

Use gprof2dot.py to generate call graphs

config.php

@@ -29,6 +29,9 @@ class Webgrind_Config extends Webgrind_MasterConfig {
 	static $defaultCostformat = 'percent'; // 'percent', 'usec' or 'msec'
 	static $defaultFunctionPercentage = 90;
 	static $defaultHideInternalFunctions = false;
+
+	static $pythonExecutable = '';
+	static $dotExecutable = '';
 
 	/**
 	* sprintf compatible format for generating links to source files. 
@@ -90,4 +93,24 @@ static function storageDir() {
 	    }
 	    return realpath(sys_get_temp_dir()).'/';
 	}
+
+	/**
+	* Path to graphviz dot executable
+	*/
+	static function dotExecutable() {
+		if (!empty(Webgrind_Config::$dotExecutable))
+			return realpath(Webgrind_Config::$dotExecutable);
+
+		return '/usr/bin/dot';
+	}
+
+	/**
+	* Path to python executable
+	*/ 
+	static function pythonExecutable() {
+		if (!empty(Webgrind_Config::$pythonExecutable))
+			return realpath(Webgrind_Config::$pythonExecutable);
+
+		return '/usr/bin/python';
+	}
 }

index.php

@@ -134,6 +134,16 @@ class Webgrind_MasterConfig
     		require 'templates/fileviewer.phtml';
 
     	break;
+			case 'function_graph':
+				$dataFile = get('dataFile');
+				$showFraction = 100 - intval(get('showFraction') * 100);
+				if($dataFile == '0'){
+					$files = Webgrind_FileHandler::getInstance()->getTraceList();
+					$dataFile = $files[0]['filename'];
+				}
+				header("Content-Type: image/png");
+				passthru(Webgrind_Config::pythonExecutable().' library/gprof2dot.py -n '.$showFraction.' -f callgrind '.Webgrind_Config::xdebugOutputDir().''.$dataFile.' | '.Webgrind_Config::dotExecutable().' -Tpng');
+			break;
     	case 'version_info':
     		$response = @file_get_contents('http://jokke.dk/webgrindupdate.json?version='.Webgrind_Config::$webgrindVersion);
     		echo $response;