How to get activated current `b:keymap_name` value

Question

I have a below line

set keymap = russian-jcukenwin.vim

in .vimrc.

When I press C-^ I get indicator in mode line , like INSERT (RU).

I'd like to output it in lightline vim config, and there is %k flag for this, but is there a different way to get the current value?

When I try below (to call it in lightline configuration)

function! CurrentKeymap() abort
    let l:current = toupper(b:keymap_name)
    return l:current
endfunction

it always returns RU - even if keymap is not activated (with C-^)

Answer 1

There is also :h iminsert you can use to check if keymap is active:

function! CurrentKeymap() abort
    return &iminsert ? toupper(b:keymap_name) : ""
endfunction