Going to insert mode at the end of command with lua function

Question

I am using Neovim and I want to go to insert mode at the end of this command.

vim.cmd([[command! DunB lua run_only_current_file("below") ]])

I have tried | startinsert and | :startinsert. but it did not work. The error says unexpected symbol near |. I also put an i at the end of the command but it typed the whole command in the editor. This is my function if it help:

function run_only_current_file(direction)
  local name=vim.fn.expand('%:t')
  local compiler="python" --defult
  local format=vim.fn.expand('%:e'):match('[^.]+$')
  if  format== 'py' then
    compiler="python"
  end
  if  format== 'js' then
    compiler="node"
  end
    vim.api.nvim_feedkeys(":" ..direction.. " split term://cd %:p:h &&" ..compiler.. " %:t\n","n", false)
end

Answer 1

I see that you are using feedkeys.

I suspect that feedkey will somehow trigger the next action asynchronously.

• Your function will first complete
• Neovim will treat the keys that you send via feedkey

The problem you have is that the buffer you want to enter in insert mode do not exist yet at that moment.

If you could you should get rid of the feedkey and replace it by an execute command:

direction .. " split term://cd %:p:h &&" ..compiler.. " %:t"

If that doesn't work because Neovim refuse to change the layout within that command then you can complete your mapping with A

 vim.api.nvim_feedkeys(":" ..direction.. " split term://cd %:p:h &&" ..compiler.. " %:t\nA","n", false)

Otherwise you could trigger a timer to enter in Insert mode after the feedkeys have been consumed by Neovim.