Force light theme on Libreoffice

force_adwaita_soffice.sh

#!/bin/bash

# Exit when any command fails
set -e

# Check for sudo/root
if [ "$EUID" -ne 0 ]
    then echo "Run this script with superuser privileges!"
    echo "This is because it needs access to /usr/lib/libreoffice/program/soffice"
    exit 1
fi

# Make backup
echo "Moving previous config to /usr/lib/libreoffice/program/soffice.bak"
mv /usr/lib/libreoffice/program/soffice /usr/lib/libreoffice/program/soffice.bak

# Append the string
sed -e '/export LC_ALL/a\' -e '\n# Force Adwaita light theme\nexport GTK_THEME=Adwaita:light' /usr/lib/libreoffice/program/soffice.bak > /usr/lib/libreoffice/program/soffice

# Copy perms from original file
sudo chmod --reference=/usr/lib/libreoffice/program/soffice.bak /usr/lib/libreoffice/program/soffice
sudo chown --reference=/usr/lib/libreoffice/program/soffice.bak /usr/lib/libreoffice/program/soffice

# Yay!
echo "Done! If you encounter any problems, restore from the previous config."

You must run this everytime libreoffice is updated.