#!/bin/bash

#  helper: trim the coreboot-libre source code (delete unused parts)
#
#	Copyright (C) 2015 Francis Rowe <info@gluglug.org.uk>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# This script assumes that the working directory is the root
# of libreboot_src or git

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

printf "purging unused parts of coreboot-libre...\n"

printf "Size of coreboot directory before the purge: $(du -ch coreboot | grep total)\n"

cd coreboot/

# __UNUSED BOARDS_______________________________________________________

printf "deleting unused boards\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/mainboard/

whitelist=" \
$(find ./apple/macbook21/) \
$(find ./emulation/qemu-i440fx/) \
$(find ./emulation/qemu-q35/ ) \
$(find ./lenovo/r400/) \
$(find ./lenovo/t60/) \
$(find ./lenovo/t400/) \
$(find ./lenovo/t500/) \
$(find ./lenovo/x60/) \
$(find ./lenovo/x200/) \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __UNUSED VENDORCODE___________________________________________________

printf "deleting unused vendor code\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/vendorcode/

whitelist=" \
./google/chromeos/chromeos.h \
./google/chromeos/gnvs.h \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __Unused architectures________________________________________________

printf "deleting unused CPU architectures\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/arch/

whitelist=" \
$(find ./x86/) \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __Unused SoC code_____________________________________________________

printf "deleting unused SoCs\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/soc/

whitelist=" \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __Unused northbridge code_____________________________________________

printf "deleting unused northbridges\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/northbridge/

whitelist=" \
$(find ./intel/i945/) \
$(find ./intel/gm45/) \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __Unused southbridge code_____________________________________________

printf "deleting unused southbridges\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/southbridge/

whitelist=" \
$(find ./intel/i82371eb/) \
$(find ./intel/i82801gx/) \
$(find ./intel/i82801ix/) \
$(find ./intel/common/) \
$(find ./ti/pci1x2x/) \
$(find ./ricoh/rl5c476/) \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

# __Unused CPU code_____________________________________________________

printf "deleting unused CPUs\n"

# keep the Kconfig files in place, otherwise there are build errors

cd src/cpu/

whitelist=" \
$(find ./intel/) \
$(find ./x86/) \
$(find ./qemu-x86/) \
$(find -type f -name 'Kconfig') \
$(find -type f -name 'Makefile.inc') \
"

for file in $(find -type f); do

	# keep files that are in the whitelist
	cnt="0"
	for keep in $whitelist; do
		if [ "$keep" = "$file" ]; then
			cnt="1"
			break
		fi
	done
	if [ "$cnt" = "1" ]; then
		continue
	fi
	
	# delete if it's not in the whitelist
	rm -f $file
	
done

cd ../../

# ______________________________________________________________________

cd ../

printf "Size of coreboot directory after the purge: $(du -ch coreboot | grep total)\n"

printf "...done\n"

printf "\n\n"