CLI stuck on prompt when running in non-interactive mode

[waldekmastykarz]

When executing a command that yields a prompt, such as spo app retract, when executed in non-interactive mode, the CLI doesn't render the prompt in the shell. Instead it hangs. If the prompt is suppressed using the --confirm option, the command works as expected. Verify if this is a limitation in Vorpal or a bug in the CLI implementation.

[waldekmastykarz]

After a quick look it seems like an issue with Vorpal. There was an issue with PR logged for it in the past (dthree/vorpal#166) but apparently there were some side-effects which is why it isn't available in the current build of Vorpal. Let's have a closer look and see if we can find a way to deal with this issue in the CLI.

[waldekmastykarz]

I've got a workaround for the issue in Vorpal. The only side effect is an extra empty line printed before and after the command output, but they seem harmless and acceptable trade-off to be able to correctly display prompts in the non-interactive mode in the CLI.

I would appreciate it, if you could have a look at the fix guys, give it a test and tell me if I missed anything and if it would be acceptable to merge in the CLI.

See the fix in my fork https://github.com/waldekmastykarz/office365-cli/tree/fix-noninteractiveprompt.

/cc: @VelinGeorgiev @andrewconnell

[VelinGeorgiev]

Hey @waldekmastykarz,

Tested on Windows and works as expected. Attached are Windows screens:
cmd.exe:

cmder:

I possess poor UI skills, but I personally do not care if it would print more empty lines. After all, one cmd/bash screen is ugly by design and this would not make big difference :). I would not pay attention if you did not mention it here.

[waldekmastykarz]

Thanks for checking @VelinGeorgiev. The result is similar (if not the same) as on macOS

[waldekmastykarz]

I've done some additional testing and it seems like the additional empty lines lead to errors when trying to process the JSON output. I tried using both jq in sh and ConvertFrom-Json in PowerShell. While the errors are slightly different, you do get an error which is specifically related to trailing empty line. We can't merge this fix in its current state as it would block users from building scripts using the CLI.

It seems like Vorpal is adding more than just an empty line to the output. Here are the chars I'm seeing:

^[[1D^[[1C^[[1000D^[[K ^[[1D^[[1C\n[{"Title":"....

And it's exactly these first characters that trip parsing JSON. We could of course remove them using grep or something similar but it would unnecessarily complicate using the CLI.