"Press-Enter" prompt in headless mode

[blueyed]

nvim --headless -c 'echoerr 1' will display the error and appears to wait for the Enter from the hit-enter prompt:

Error detected while processing command line:
1

It does not handle any Enter presses though, and Ctrl-C is required to cancel it.

Without --headless it will redraw the screen and displays:

Error detected while processing command line:
1
Press ENTER or type command to continue

You can use nvim --headless -c 'echoerr 1' -c q to work around this, but Neovim should not hang there without -c q already.

[justinmk]

Yeah, in --headless mode we should not wait for user input. We already do a similar check in msg_use_printf, maybe we need a condition in the need_wait_return muck.

[blueyed]

I could fix it for my use case by checking msg_use_printf in wait_return, but for the test case here that appears to not be enough, i.e. some other code path is used there - wait_return is not involved.