How do I make vim.fn.feedkeys('d', 'n') enter operator-pending mode?

[nyngwang]

As title. I have a keymap like this:

vim.keymap.set('n', 'd',  function () if dapui_open and G.cur_tab(tab_debug) then return end vim.fn.feedkeys('d', 'n') end)

I found that diw was treated as idw, i.e. it entered insert mode and inserted dw. How do I fix it?

[nyngwang]

I found that the cause is that I also define some other keymaps starting with d, e.g. d{d,m,c,r,t,k, ...}, and this makes the d of di delayed(if I remove all other d{...} keymaps then no such problem) so instead id will be executed. To work around this, simply make di a special case too:

vim.keymap.set('n', 'di',  function () if dapui_open and G.cur_tab(tab_debug) then return end vim.fn.feedkeys('di', 'n') end)

[nyngwang]

You still need to read the answer below to avoid the usage of vim.fn.feedkeys

[zeertzjq]

It's better to use an expr mapping and vim.schedule() the G.curtab() here.

[nyngwang]

Thank you. The reason I didn't use expr because I thought using it wouldn't be able to call a function, i.e. G.cur_tab here. I will try your advice.

For more context (apologies that I omitted it) the G.cur_tab is defined like this:

function M.cur_tab(tab)
  if not tab then tab = -1 end
  return vim.api.nvim_get_current_tabpage() == tab
end

[nyngwang]

Does putting vim.schedule() inside/outside G.curtab make a difference?

[zeertzjq]

Oh, vim.schedule() isn't needed here at all.

[nyngwang]

I have tried expr and it works well 😄, but now I have a little problem with the following three keymaps that dap.{terminate,step_back,step_over} will only be executed after the next any key that follows d{t,k,j}. Do you know what's the cause? (my G.EXPR_NOREF... is {expr=true, noremap=true, silent=true, nowait=true})

vim.keymap.set('n', 'dt', function () if dapui_open and G.cur_tab(tab_debug) then dap.terminate() return end return 'dt' end, G.EXPR_NOREF_NOERR_TRUNC)
vim.keymap.set('n', 'dk', function () if dapui_open and G.cur_tab(tab_debug) then dap.step_back() return end return 'dk' end, G.EXPR_NOREF_NOERR_TRUNC)
vim.keymap.set('n', 'dj', function () if dapui_open and G.cur_tab(tab_debug) then dap.step_over() return end return 'dj' end, G.EXPR_NOREF_NOERR_TRUNC)

[nyngwang]

Nevermind, I found the solution by

- dap.terminate() return end -- ...
+ dap.terminate() return '<NOP>' end --..