GNOME dynamic (slideshow) desktop background (XML) generator

update.sh

#!/bin/zsh
# Place this file as the sibling of directory 'img/' which contains all the images.
# The output will be 'img.xml' which changes the backgrounds every 24 hours (86400 secs).

cd "${0:h}"

(
  cat <<EOF
<background>
    <starttime>
        <year>2024</year>
        <month>01</month>
        <day>01</day>
        <hour>00</hour>
        <minute>00</minute>
        <second>00</second>
    </starttime>

EOF

  shuf -e "$PWD"/img/* | while read -r i; do
    echo Found: $i >&2
    cat <<EOF
    <static>
        <duration>86400.0</duration>
        <file>$i</file>
    </static>
EOF
  done

  cat <<EOF
</background>
EOF
) > img.xml