The question duplicates when terminal overflows about survey HOT 19 CLOSED

I did a workaround for this issue by disabling line wrap before calling into the package to ask the questions.

// make terminal not line wrap
fmt.Printf("\x1b[?7l")
// defer restoring line wrap
defer fmt.Printf("\x1b[?7h")

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We can finally close this!! 🎉🎉🎉

Thank you so much @coryb and @Zalgo2462! Like i said, this has been a problem for a very very long time. Thank you for seeing this through

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Just verified that this also affects OSX terminals. Thanks for bringing this to my attention @geocine!

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The issue happens because https://github.com/AlecAivazis/survey/blob/master/core/renderer.go#L77 doesn't take wrapping into account (i.e. when the terminal wraps, it adds extra \n that were not present in the initial rendered template) resulting in resetPrompt erasing only (original number of lines - number of wrapped lines) lines.

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@AlecAivazis any idea on when this issue could be fixed?

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Gah! Sorry to hear this, i'll try to fix it ASAP - do you by chance have access to a linux machine and could see if it's affecting you there too? I'm pretty sure I verified overflow behavior on a posix terminal but there might be something special with your question or prompt.

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@AlecAivazis, I don't have an access even to Linux VM, but I assume, this bug doesn't affect only password asking. Same "overflowing" behaviour with select option.

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Okay no worries @frodgesh . Since I'm currently on a windows machine I figured I leave a note to my future self that I was able to reproduce this with the ask test and a very thin cmd.exe terminal. It only duplicated on clean-up.

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Running into this problem now on macOS! I had a look through the source code but can't find anything obvious that could be causing this.

The funny thing is that the same thing also happens with another popular CLI prompt (promptui). At first I thought it might be related to promptui's dependency on readline but apparently that's not it.

Any hunches as to what could be causing this?

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do you by chance have access to a linux machine and could see if it's affecting you there too?

Hi @AlecAivazis we are currently using this package for implementing a command in our project and I experienced the same issue on my machine (OS: Ubuntu 16.04, shell: zsh).

Please let me know when its fixed 😄

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issue confirmed (OS: Ubuntu 18.04.1, shell: zsh). Another workaround may be get terminal column size then insert new lines at that index before rendering text.

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Perhaps it would be worth using a terminal emulation library to deal with this issue, though of course that would mean adding another dependency…

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This is biting me too. Any ideas on how to fix?

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I had taken a quick look but there was no obvious solution with the current implementation as it doesn't have access to the text being currently displayed (iirc). As a workaround, I wrap lines "manually" before handing text that I know might wrap to survey… Not ideal.

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I think the most suitable solution would be:

1. Implementing a watchdog for terminal size, as this issue also happens when terminal resize.
2. Send an event to renderer/writer to re-draw the prompt if line lengths exceed terminal width.
3. Re-draw and add "\n" to avoid unwanted glitches.

I use a similar mechanism on a project but it's not public at the moment. So, I can't link the code here. Although I don't use survey, things work similar.

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Seeing this in Linux terminals as well, not just OSX.

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I managed to "fix" this by disabling the "Message" part of the prompt.

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I also noticed that if you press "?" for a help message (when that feature is being used) and then press a different key the help message will be re-printed instead of the original message (presumably since it's the last thing that was displayed?). Not sure if that helps with debugging.

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seeing this in Konsole as well. Prompt reprints instead of refreshing terminal.

Behavior is not present in Gnome Terminal or Xterm.

• Konsole 19.12.3
• KDE 5.18.14
• Linux apple-2 5.4.31-1-MANJARO #1 SMP PREEMPT Wed Apr 8 10:25:32 UTC 2020 x86_64 GNU/Linux

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