Enable file preview for some file types

[faxotherapy]

I use the option --preview-window='hidden,bottom,66%,wrap' --preview 'glow -p -w 110 -s dark {}' to preferably preview TXT or MD files.

Is is possible to preview only those extension types as previewing is irrelevant for video files.

I thought using something like this would help, but not working:

--preview '[[ -n `file {}  |  grep -o text$` ]] && glow -p -w 110 -s dark {}'

[faxotherapy]

I solved my problem as follows:

1. Create a function:

   pale() { [[ -n `file "$1" | grep -o text` ]] && glow -p -w 110 -s dark "$1" }

2. Rewrite fzf option:

   --preview 'zsh -c $(functions pale); pale {}'

   For Bash user, read this.

Inspired by this post.