#!/bin/sh
# mkpatch.sh
# This shell script allows you to create a patch based on changes made to options.h, options.mk, toggle.h and toggle.mk.

# Set old (current) directory
CD="$(pwd)"

CP() {
  cp docs/options.def.h /tmp/options.h
  cp docs/options.def.mk /tmp/options.mk
  cp docs/toggle.def.h /tmp/toggle.h
  cp docs/toggle.def.mk /tmp/toggle.mk
  cp docs/keybinds.def.h /tmp/keybinds.h
}

MKDIFF() {
  cd /tmp
  
  # Create patches
  diff -up ./options.h $CD/options.h > $CD/options.h_settings.patch && echo "Created options.h patch (see options.h_settings.patch)"
  diff -up ./options.mk $CD/options.mk > $CD/options.mk_settings.patch && echo "Created options.mk patch (see options.mk_settings.patch)"
  diff -up ./toggle.h $CD/toggle.h > $CD/toggle.h_settings.patch && echo "Created toggle.h patch (see toggle.h_settings.patch)"
  diff -up ./keybinds.h $CD/keybinds.h > $CD/keybinds.h_settings.patch && echo "Created keybinds.h patch (see keybinds.h_settings.patch)"
  diff -up ./toggle.mk $CD/toggle.mk > $CD/toggle.mk_settings.patch && echo "Created toggle.mk patch (see toggle.mk_settings.patch)"

  # Delete
  rm -f /tmp/options.h
  rm -f /tmp/options.mk
  rm -f /tmp/toggle.h
  rm -f /tmp/keybinds.h
  rm -f /tmp/toggle.mk
}

# Patch the source
if [ "$1" = "-p" ]; then
		ls *.patch || exit 1
		patch < options.h_settings.patch
		patch < options.mk_settings.patch
		patch < toggle.h_settings.patch
		patch < toggle.mk_settings.patch
		patch < keybinds.h_settings.patch
		cd $CD
		exit 0
fi

# Remove the patch
if [ "$1" = "-r" ]; then
		ls *.patch || exit 1
		patch -R < options.h_settings.patch
		patch -R < options.mk_settings.patch
		patch -R < toggle.h_settings.patch
		patch -R < toggle.mk_settings.patch
		patch -R < keybinds.h_settings.patch
		cd $CD
		exit 0
fi

# Create patches
if [ "$1" = "-mk" ]; then
		CP
		MKDIFF
		cd $CD
		exit 0
fi

printf "mkpatch help\n\n"
printf "Usage:\n"
printf "\nmkpatch -p  Apply the patch directly."
printf "\nmkpatch -r  Remove the patch directly."
printf "\nmkpatch -h  Display this help."
printf "\nmkpatch -mk Create patches based on changes."
printf "\nNo arguments will print help.\n"