added the random type

pmwiki_recipes/exercises.php

@@ -25,6 +25,8 @@ function Exercises($pagename, $auth){
 	$type = $_GET["type"];
 
 	$availableexercisetypes = array("pagelink", "expressioninpage");
+	if ($type=="random")
+		$type= $availableexercisetypes[rand(0,count($availableexercisetypes)-1)];
 
 	switch ($type){
 		case "pagelink":
@@ -105,11 +107,11 @@ function Exercises($pagename, $auth){
 		foreach ($availableexercisetypes as $e) {
 			$result	.= " [[$pagename?action=Exercises&type=$e|$e]],";
 		}
-		$result .= ".";
+		$result .= " or a [[$pagename?action=Exercises&type=random|random]] one.";
-	}
 		if ( $counter > 0) {
 			$result .= " (note that it resets the counter)";
 		}
+	}
 	$renderedresult = MarkupToHTML($pagename, $result);
 	print $renderedresult;