#!/bin/sh -e

################################################################################
# Title:        Grub-config script
# Description: script to configure  thr grub defaults
# Author:       manuel rosa <manuelsilvarosa@gmail.com>
# Date:         Outubro 29, 2023
# License:      GPL-3.0-or-later
################################################################################

# This script configures grub defaults after Debian installation.

# Defines the variables
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="My-distro"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
GRUB_GFXMODE=1440x900
GRUB_THEME="/boot/grub/themes/peppermint/theme.txt"
GRUB_DISABLE_OS_PROBER=false

# GRUB configuration file path
GRUB_CONFIG_FILE="/target/etc/default/grub"

# Modify the GRUB file
sed -i "s/^GRUB_DEFAULT=.*/GRUB_DEFAULT=$GRUB_DEFAULT/" $GRUB_CONFIG_FILE
sed -i "s/^GRUB_TIMEOUT=.*/GRUB_TIMEOUT=$GRUB_TIMEOUT/" $GRUB_CONFIG_FILE
sed -i "s/^GRUB_DISTRIBUTOR=.*/GRUB_DISTRIBUTOR=\"$GRUB_DISTRIBUTOR\"/" $GRUB_CONFIG_FILE
sed -i "s/^GRUB_CMDLINE_LINUX_DEFAULT=.*/GRUB_CMDLINE_LINUX_DEFAULT=\"$GRUB_CMDLINE_LINUX_DEFAULT\"/" $GRUB_CONFIG_FILE
sed -i "s/^GRUB_CMDLINE_LINUX=.*/GRUB_CMDLINE_LINUX=\"$GRUB_CMDLINE_LINUX\"/" $GRUB_CONFIG_FILE
sed -i "s/^#GRUB_GFXMODE=.*/GRUB_GFXMODE=$GRUB_GFXMODE/" $GRUB_CONFIG_FILE
# Add GRUB_THEME if it doesn't exist
if ! grep -q "^GRUB_THEME=" $GRUB_CONFIG_FILE; then
    echo "GRUB_THEME=\"$GRUB_THEME\"" >> $GRUB_CONFIG_FILE
else
    sed -i "s#^GRUB_THEME=.*#GRUB_THEME=\"$GRUB_THEME\"#" $GRUB_CONFIG_FILE
fi
sed -i "s/^#GRUB_DISABLE_OS_PROBER=.*/GRUB_DISABLE_OS_PROBER=$GRUB_DISABLE_OS_PROBER/" $GRUB_CONFIG_FILE

# Run update-grub after modifying the file
chroot /target update-grub