Implement String#trim

fixes #11037

doc/18-language-reference.md

@@ -879,7 +879,7 @@ type objects are made available using global variables which match the type's na
 The type object's `prototype` property can be used to find out which methods a certain type
 supports:
 
-    /* This returns: ["contains","find","len","lower","replace","reverse","split","substr","to_string","upper"] */
+    /* This returns: ["contains","find","len","lower","replace","reverse","split","substr","to_string","trim","upper"] */
     keys(String.prototype)
 
 Additional documentation on type methods is available in the

doc/19-library-reference.md

@@ -508,6 +508,14 @@ Signature:
 
 Returns a copy of the string in reverse order.
 
+### <a id="string-trim"></a> String#trim
+
+Signature:
+
+    function trim();
+
+Removes trailing whitespaces and returns the string.
+
 ## <a id="object-type"></a> Object type
 
 This is the base type for all types in the Icinga application.

lib/base/string-script.cpp

@@ -133,6 +133,13 @@ static String StringReverse(void)
 	return self.Reverse();
 }
 
+static String StringTrim(void)
+{
+	ScriptFrame *vframe = ScriptFrame::GetCurrentFrame();
+	String self = vframe->Self;
+	return self.Trim();
+}
+
 Object::Ptr String::GetPrototype(void)
 {
 	static Dictionary::Ptr prototype;
@@ -149,6 +156,7 @@ Object::Ptr String::GetPrototype(void)
 		prototype->Set("contains", new Function(WrapFunction(StringContains), true));
 		prototype->Set("replace", new Function(WrapFunction(StringReplace), true));
 		prototype->Set("reverse", new Function(WrapFunction(StringReverse), true));
+		prototype->Set("trim", new Function(WrapFunction(StringTrim), true));
 	}
 
 	return prototype;