Cycle through multiple wallpaper folders for a proper shuffled feel. Will re-shuffle once it has done a cycle. This was written using ChatGPT and further cleanup by me.

shuffle.sh

#!/bin/bash

# Directories containing the images for both landscape and portrait
p_pics="$HOME/Pictures/Wallpapers/portrait"
l_pics="$HOME/Pictures/Wallpapers/landscape"

# File to store the shuffled images for both landscape and portrait
p_pics_shuf="$HOME/.p_pics_shuf"
l_pics_shuf="$HOME/.l_pics_shuf"

# Flag file to keep track of whether the shuffled images have been used up
flag_file="$HOME/.bg_shuf_flag"

# Check if the shuffled image files exist
if [ ! -f "$p_pics_shuf" ] || [ ! -f "$l_pics_shuf" ] || [ -f "$flag_file" ]; then
    # Shuffle the images in the portrait and landscape directories
    shuf -e "$p_pics"/* > "$p_pics_shuf"
    shuf -e "$l_pics"/* > "$l_pics_shuf"
    # Reset the flag file
    rm -f "$flag_file"
fi

# Read the shuffled images into arrays
p_p_shuf=( $(cat "$p_pics_shuf") )
l_p_shuf=( $(cat "$l_pics_shuf") )

# File to store the current image index
index_portrait="$HOME/.bg_p"
index_landscape="$HOME/.bg_l"

# Get the current index from the file, or set it to 0 if the file doesn't exist
current_index_p=${current_index_p:-$(cat "$index_portrait")}
current_index_l=${current_index_l:-$(cat "$index_landscape")}

# Set the background to the current image
feh --bg-fill "${l_p_shuf[current_index_l]}" "${p_p_shuf[current_index_p]}"

# Update the current index and save it to the file
current_index_l=$(( (current_index_l + 1) % ${#l_p_shuf[@]} ))
echo "$current_index_l" > "$index_landscape"
current_index_p=$(( (current_index_p + 1) % ${#p_p_shuf[@]} ))
echo "$current_index_p" > "$index_portrait"

# Check if all images have been used
if [ $current_index_l -eq 0 ] && [ $current_index_p -eq 0 ]; then
  touch "$flag_file"