fehview.sh -- uses feh, gifview, and heif-convert to get quick previews

gistfile1.txt

#!/bin/bash
# uses gifview: https://linux.die.net/man/1/gifview
# uses heif-convert: https://pypi.org/project/heif-convert/

shopt -s nullglob


if [[ ! -f $1 ]]; then
    notify-send "ERROR"
    echo "$0: first argument is not a file" >&2
    exit 1
fi


if [[ "$1" =~ .*.heic ]];then
    tmpfile=$(echo "$(mktemp).jpg")
    heif-convert -q 75 "${1}" "${tmpfile}"
    bob=$(feh --auto-zoom --scale-down --geometry 640x480 "${tmpfile}")
    rm "${tmpfile}"
else
    if [[ "$1" =~ .*.gif ]];then
        gifview -a "$1"
    else
        bob=$(feh --auto-zoom --scale-down --geometry 640x480 "$1")
    fi
fi