Add children modules feature

[geetanshjuneja]

Links to #17401

[geetanshjuneja]

@Veykril I have implemented whatever was stated in issue. Looks like I also need need to add childrenModule function in commands.ts and children_module handler in request.rs similar to parentModule.

[Veykril]

Let's make this plural, that is all children_module occurences should be children_modules

[Veykril]

Suggested change

	// Return all the children module inside the ItemList of the parent module
	module
	.syntax()
	.children()
	.filter_map(ast::ItemList::cast)
	.flat_map(|it| it.syntax().children())
	.filter_map(ast::Module::cast)
	.flat_map(|m| {
	sema.to_def(&m)
	.into_iter()
	.flat_map(|module| NavigationTarget::from_module_to_decl(db, module))
	})
	.collect()
	sema
	.to_def(&module)
	.into_iter()
	.flat_map(|module| module.children(db))
	.map(|module| NavigationTarget::from_module_to_decl(db, module))
	.collect(),

[Veykril]

Suggested change

	// Return all the children module inside the source file
	source_file
	.syntax()
	.children()
	.filter_map(ast::Module::cast)
	.flat_map(|m| {
	sema.to_def(&m)
	.into_iter()
	.flat_map(|module| NavigationTarget::from_module_to_decl(db, module))
	})
	.collect()
	sema
	.file_to_module_defs(position.file_id)
	.flat_map(|module| module.children(db))
	.map(|module| NavigationTarget::from_module_to_decl(db, module))
	.collect(),

[Veykril]

Thanks!

[Veykril]

Will need a rebase + updating the hash in docs/dev/lsp-extensions.md.

[davidbarsky]

Let's make this plural, that is all children_module occurences should be children_modules

This might be autocorrect, but I think this should be called child_modules?