Gnome slideshow

slideshow.md

Gnome slideshow

Generate a slideshow to GNOME desktop background.

Usage

slideshow.sh INDIR > "slideshow.$(date -I).xml"

Example script

#!/bin/bash
# my-slideshow.sh

slideshow::init
# Add first image
slideshow::static "10" "IMG1.jpg"
# First image transition to the second one
slideshow::transition "5" "IMG1.jpg" "IMG2.jpg"
# Second image
slideshow::static "10" "IMG2.jpg"
# Second image transition to the third one
slideshow::transition "5" "IMG2.jpg" "IMG3.jpg"
# Second image transition to the third one
slideshow::static "10" "IMG3.jpg"
# Loop last image transtion to the first one.
slideshow::transition "5" "IMG3.jpg" "IMG1.jpg"
slideshow::end

Launch

./my-slideshow.sh > my-slideshow.xml

Thanks you

• ubuntu-fr.org
• opensource.com
• gnome.org

slideshow.sh

#!/bin/bash

function slideshow::init () {
  cat <<EOF
<background>
  <starttime></starttime>
EOF
}

function slideshow::end () {
  cat <<EOF
</background>
EOF
}

# DURATION FILE
function slideshow::static () {
  cat <<EOF
  <static>
    <duration>${1}</duration>
    <file>${2}</file>
  </static>
EOF
}

# DURATION FROM TO
function slideshow::transition () {
  cat <<EOF
  <transition type="overlay">
    <duration>${1}</duration>
    <from>${2}</from>
    <to>${3}</to>
  </transition>
EOF
}

# IMG [...IMG]
function slideshow::from () {
  local first prev
  slideshow::init
  first="${1}"
  slideshow::static 10 "${first}"
  prev="${first}"
  until [ $# -eq 0 ]; do
    slideshow::transition 5 "${prev}" "${1}" 
    slideshow::static 10 "${1}"
    prev="${1}"
    shift
  done
  slideshow::transition 5 "${prev}" "${first}"
  slideshow::end
}

function main () {
  local indir="${1}" img
  local -a imgs
  local -i i
  if [ $# -lt 1 ]; then
    printf "Usage: %s INDIR\n" "${0}" >&2
    return 1
  fi
  # Get all jpg files sorted by numerical order
  mapfile -t imgs < <(find "$(realpath "${indir}")" -maxdepth 1 -type f -name "*.jpg" | sort -V)
  if [ "${#imgs[@]}" -eq 0 ]; then
    echo "No .jpg files found" >&2
    return 1
  fi
  slideshow::from "${imgs[@]}"
}

if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
  main "$@"
fi