Help with Fixing an Issue

[kelleyma49]

I have a bug that I'm trying to fix and I'm blocked. Here's the bug:

kelleyma49/PSFzf#274

This image from that bug succinctly sums up the issue:

I believe that a VT command or a Windows command that leaves the Windows terminal in a weird state. I've tried going through all of the VT commands to reset the terminal state, but I can never get the terminal back into the correct state.

Questions for the Windows terminal engineers:

• Is there a VT command that might reset all formatting that would resolve the issue?
• Is there a known VT command or Windows function call that would leave the terminal in a state like this?
• Any other advice?

[o-sdn-o]

I believe that a VT command or a Windows command that leaves the Windows terminal in a weird state.

To localize the bug source (someone leaves the terminal with DISABLE_NEWLINE_AUTO_RETURN mode enabled), a step-by-step repro from ground (fresh setup) is required.

• Is there a VT command that might reset all formatting that would resolve the issue?
• Is there a known VT command or Windows function call that would leave the terminal in a state like this?

You can use Win32 Console API to toggle the DISABLE_NEWLINE_AUTO_RETURN mode.

• Powershell script.
  con_mode.ps1:

  $win32 = Add-Type -Name WinAPI -PassThru -MemberDefinition @'
  [DllImport("kernel32.dll")] public static extern IntPtr GetStdHandle(int nStdHandle);
  [DllImport("kernel32.dll")] public static extern uint SetConsoleMode(IntPtr hConsoleHandle, uint dwMode);
  [DllImport("kernel32.dll")] public static extern uint GetConsoleMode(IntPtr hConsoleHandle, out uint lpMode);
  '@
  $STD_OUTPUT_HANDLE = -11
  $DISABLE_NEWLINE_AUTO_RETURN = 8
  $mode = 0
  $handle = $win32::GetStdHandle($STD_OUTPUT_HANDLE)
  $rc = $win32::GetConsoleMode($handle, [ref]$mode)
  if ($args[0]) { $mode = $mode -bOr $DISABLE_NEWLINE_AUTO_RETURN }
  else          { $mode = $mode -bAnd (-bNot $DISABLE_NEWLINE_AUTO_RETURN) }
  $rc = $win32::SetConsoleMode($handle, $mode)

• Turn on DISABLE_NEWLINE_AUTO_RETURN:
  pwsh:

  ./con_mode.ps1 1
  "test: line1`nline2`nline3"
  

• Turn off DISABLE_NEWLINE_AUTO_RETURN:
  pwsh:

  ./con_mode.ps1 0
  "test: line1`nline2`nline3"
  

Also you can use vt-sequence LNM (Line Feed/New Line Mode), xlink: #15167:

• Turn on DISABLE_NEWLINE_AUTO_RETURN:
  pwsh:

  "`e[20l"
  "test: line1`nline2`nline3"
  

• Turn off DISABLE_NEWLINE_AUTO_RETURN:
  pwsh:

  "`e[20h"
  "test: line1`nline2`nline3"
  

[kelleyma49]

@o-sdn-o , your post was very useful! Running ./con_mode.ps1 0 did undo the issue in a terminal session. I am unblocked!