Multi-monitor wallpaper generator. One image per monitor.

wallpaper

#!/bin/bash
# Multi-monitor wallpaper generator
# Requires imagemagick, xrandr, feh
# Usage: pipe a list of images to this script
# Example: ls ~/Pictures/*.JPG | sort -R | sh wallpaper

{
	# ignore first line
	read -u 3 -r ign;
	# reading from xrandr piped in last line
	while IFS=\  read -u 3 -r ign ign specs ign; do
		heighttmp=${specs##*x};
		# read a filename from stdin
		read -r image;
		echo $image;
		# add -composite statements to our convert command
		composites+="\( '$image' -resize ${specs%%/*}\x${heighttmp%%/*} \) \
			-geometry +$(echo $specs | cut -f2-3 -d+) -composite ";
	done
	# use imagemagick to assemble the wallpaper using xrandr to get
        # the total virtual res of the X display, then pipe it to feh
	eval convert -size "$(xrandr | head -1 | cut -f8-10 -d\  | tr -d ' ,')" \
		xc:skyblue "${composites[@]}" jpg:- | feh --bg-tile -;
# read info about monitors
} 3<<< $(xrandr --listactivemonitors);