vim8 popup menu with custom filter function

menu_popup2.vim

vim9script

var x = '[A]pple [B]anana [C]herry [O]range'->split()

def MyMenuHandler(winid: number, result: any)
	popup_notification("you selected " .. x[result - 1] .. '.', { pos: 'center', time: 1000 })
enddef

def MyMenuFilter(winid: number, key: string): bool
	var i = match('AaBbCcOo', key)
	if i >= 0
		popup_close(winid, 1 + (i / 2))
		return true
	endif
	return popup_filter_menu(winid, key)
enddef

popup_menu(x, { pos: 'center', filter: MyMenuFilter, callback: MyMenuHandler })

popup_menu_demo.vim

let s:x = '[A]pple [B]anana [C]herry [O]range'->split()

function! s:my_menu_handler(winid, result) abort
	call popup_notification("you selected " . s:x[a:result-1] . '.',
				\#{pos:'center', time:1000})
endfunction

function! s:my_menu_filter(winid, key) abort
	let i =  stridx('AaBbCcOo', a:key)
	if i >= 0
		echom i/2
		return popup_close(a:winid, 1 + (i/2))
	endif
	return popup_filter_menu(a:winid, a:key)
endfunction

let w = popup_menu(s:x, #{
			\pos: 'center',
			\filter:function('s:my_menu_filter'),
			\callback:function('s:my_menu_handler')
			\})