Slow preview command with PowerShell on Linux

[thorstenkampe]

• [ x] I have read through the manual page (man fzf)
• [ x] I have the latest version of fzf
• [ x] I have searched through the existing issues

Info

• OS
  • [x] Linux
  • [ ] Mac OS X
  • [ ] Windows
  • [ ] Etc.
• Shell
  • [ ] bash
  • [ ] zsh
  • [ ] fish
  • [x] pwsh

Problem / Steps to reproduce

fzf --preview 'echo {}'

You will see a delay of about three seconds for the preview window to update. This is because fzf runs $Env:SHELL -c <preview-command> which is very expensive for PowerShell. As a workaround, one can unset the environment variable.

On Windows PowerShell does not set $Env:SHELL , so there is no delay.

Is there a rationale why fzf by default forks a new shell to run preview command instead of running the command by itself - which seems to be the default if $Env:SHELL is unset?

[isti115]

Similar problem, if I have pwsh set as my default shell, and run fzf.vim commands, I get an error message by default, since it cannot execute preview.sh in PowerShell for some reason, even though from pwsh I can execute it without any issues directly.

Thank you very much for the workaround @thorstenkampe, your workaround of unsetting $Env:SHELL fixes this too, but a built in long term solution would be much appreciated!