#!/bin/bash

# Prints the numeric value
function numVal {
  echo "$1" | grep -o -- '-\?[0-9]\+\(.[0-9]\+\)\?'
}

# Make new pipe
PIPE=$(mktemp -u)
mkfifo $PIPE

# Internalize pipe
exec 3<>$PIPE
rm $PIPE

# Print out latitude and logitude to pipe
"/usr/lib/geoclue-2.0/demos/where-am-i" | grep -m1 -A 3 "New location:" >&3 &

# Read latitude and longitudes
read unused <&3
read lat    <&3
read long   <&3

lat=$(numVal "$lat")
long=$(numVal "$long")

# Close pipe
exec 3<&-

# Call redshift
exec redshift "-l$lat:$long"