Run :terminal so it starts in terminal-normal mode?

Question

I want to run an async command and when it completes open a terminal window. Since the opening is delayed, I don't want it to steal input from me, so the new window should be in Terminal-Normal mode.

So far, the best I've figured out is opening it in a new tab and returning to the previous tab, but if I gt to that tab, it's still in Terminal-mode and I can't gt out of it without exiting to Terminal-normal.

function! project#run_after_compile(return_code) abort
    if a:return_code == 0
        tab terminal ++norestore C:\bin\run_game.bat
        tabnext #
    endif
endf

(I'm using this with asyncrun to build with makeprg so errors go to quickfix then run in a terminal so its interactive: let g:asyncrun_exit = 'call project#run_after_compile(g:asyncrun_code)')

Answer 1

Use feedkeys:

function! project#run_after_compile(return_code) abort
    if a:return_code == 0
        terminal ++norestore C:\bin\run_game.bat
        " Replace C-W if you have set 'termwinkey'.
        " Must pass "x" to allow other commands to follow (wincmd).
        call feedkeys("\<C-W>N", "x")
        wincmd p
    endif
endf

" Or put it in a tab:
function! project#run_after_compile(return_code) abort
    if a:return_code == 0
        tab terminal ++norestore C:\bin\run_game.bat
        call feedkeys("\<C-W>N", "x")
        tabnext #
    endif
endf

Note: Trying to be portable with feedkeys(&termwinkey .."N") doesn't work. I believe it's due to how you need to escape < for feedkeys.