Correct way to get returnType to show in completionItem List

[ejfasting]

Hello,

I'm working on a project that has some Classes with MethodMembers / FieldMembers.

The class is defined like this in the grammar:

Class returns DefinitionNamedElement: 
    {infer Class} 'Class' name=ID '{'
    members+=ClassMember*
'}';

ClassMember: MethodMember | FieldMember;

 MethodMember:
     returnType=[Class:ID] name=ID '(' (parameters+=Parameter (',' parameters+=Parameter)*)? ')' ';';

FieldMember:
    returnType=[Class:ID] name=ID ';';

Parameter: type=[Class:ID] ':' name=ID ;

I then define a class like this:

Class TestClass {
    /** Some documentation */
    Integer abc;
    /** Some other documentation */
    Integer methodReturnsInt();
}

And with the correct Scope it shows up (with the comments) in the editor:

I would like to change how this completionItem is presented. For instance I want to clearly state the returnType of the Method/Field, and optimally replace FieldMember from the screenshot above.

Can anyone point me in the correct direction to do this?

//E

[msujew]

Hey @ejfasting,

you can override the DefaultCompletionProvider#createReferenceCompletionItem method to adjust what is displayed as the detail of each completion item:

langium/packages/langium/src/lsp/completion/completion-provider.ts

Lines 471 to 481 in 89c0a9d

	protected createReferenceCompletionItem(nodeDescription: AstNodeDescription): CompletionValueItem {
	const kind = this.nodeKindProvider.getCompletionItemKind(nodeDescription);
	const documentation = this.getReferenceDocumentation(nodeDescription);
	return {
	nodeDescription,
	kind,
	documentation,
	detail: nodeDescription.type,
	sortText: '0'
	};
	}

[ejfasting]

Worked perfectly, thank you @msujew! :)