#!/bin/bash

longusage() {
  echo "Gentoo Linux Genkernel ${GK_V}"
  echo "Usage: "
  echo "  genkernel [options] action"
  echo
  echo "Available Actions: "
  echo "  all				Build all steps"
  echo "  kernel			Build only the kernel and modules"
  echo "  initrd			Build only the initrd"
  echo
  echo "Available Options: "
  echo "  Debug settings"
  echo "	--debuglevel=<0-5>	Debug Verbosity Level"
  echo "	--debugfile=<outfile>	Output file for debug info"
  echo "	--color			Output debug in color"
  echo "	--no-color		Do not output debug in color"
  echo "  Kernel Configuration settings"
  echo "	--menuconfig		Run menuconfig after oldconfig"
  echo "	--no-menuconfig		Do not run menuconfig after oldconfig"
  echo "	--gconfig		Run gconfig after oldconfig"
  echo "	--xconfig		Run xconfig after oldconfig"
  echo "	--save-config		Save the configuration to /etc/kernels"
  echo "	--no-save-config	Don't save the configuration to /etc/kernels"
  echo "  Kernel Compile settings"
  echo "	--clean			Run make clean before compilation"
  echo "	--mrproper		Run make mrproper before compilation"
  echo "	--no-clean		Do not run make clean before compilation"
  echo "	--no-mrproper		Do not run make mrproper before compilation"
  echo "	--oldconfig		Implies --no-clean and runs a 'make oldconfig'"
  echo "	--bootsplash		Install bootsplash support to the initrd"
  echo "	--no-bootsplash		Do not use bootsplash"
  echo "	--install		Install the kernel after building"
  echo "	--no-install		Do not install the kernel after building"
  echo "	--no-initrdmodules	Don't copy any modules to the initrd"
  echo "	--udev			Add in udev support."
  echo "	--callback=<...>	Run the specified arguments after"
  echo "				the kernel and modules have been"
  echo "				compiled."
  echo "  Kernel settings"
  echo "	--kerneldir=<dir>	Location of the kernel sources"
  echo "	--kernel-config=<file>	Kernel configuration file to use for compilation"
  echo "	--module-prefix=<dir>	Prefix to kernel module destination, modules will"
  echo "				be installed in <prefix>/lib/modules"
  echo "  Low-Level Compile settings"
  echo "	--kernel-cc=<compiler>	Compiler to use for kernel (e.g. distcc)"
  echo "	--kernel-as=<assembler>	Assembler to use for kernel"
  echo "	--kernel-ld=<linker>	Linker to use for kernel"
  echo "	--kernel-make=<makeprg> GNU Make to use for kernel"
  echo "	--utils-cc=<compiler>	Compiler to use for utilities"
  echo "	--utils-as=<assembler>	Assembler to use for utils"
  echo "	--utils-ld=<linker>	Linker to use for utils"
  echo "	--utils-make=<makeprog>	GNU Make to use for utils"
  echo "	--makeopts=<makeopts>	Make options such as -j2, etc."
  echo "	--mountboot		Mount /boot automatically"
  echo "	--no-mountboot		Don't mount /boot automatically"  
  echo "  Initialization"
  echo "	--bootsplash=<theme>	Force bootsplash using <theme>."
  echo "	--do-keymap-auto	Forces keymap selection at boot."
  echo "	--no-lvm2		Don't add in LVM2 support."
  echo "        --bootloader=grub       Add new kernel to GRUB configuration"
  echo "  Internals"
  echo "	--tempdir=<dir>		Location of Genkernel's temporary directory"
  echo "	--arch-override=<arch>	Force to arch instead of autodetect"
  echo "  Output Settings"
  echo "        --minkernpackage=<tbz2> File to output a .tar.bz2'd kernel and initrd:"
  echo "                                No modules outside of the initrd will be"
  echo "                                included..."
}

usage() {
  echo "Gentoo Linux Genkernel ${GK_V}"
  echo "Usage: "
  echo "	genkernel [options] all"
  echo
  echo 'Some useful options:'
  echo '	--menuconfig		Run menuconfig after oldconfig'
  echo '	--no-clean		Do not run make clean before compilation'
  echo '	--no-mrproper		Do not run make mrproper before compilation,'
  echo '				this is implied by --no-clean.'
  echo
  echo 'For a detailed list of supported options and flags; issue:'
  echo '	genkernel --help'
}

parse_opt() {
	case "$1" in
		*\=*)
			echo "$1" | cut -f2- -d=
		;;
	esac
}

parse_cmdline() {
	case "$*" in
	      --kernel-cc*)
		      CMD_KERNEL_CC=`parse_opt "$*"`
		      print_info 2 "CMD_KERNEL_CC: $CMD_KERNEL_CC"
	      ;;
	      --kernel-ld*)
		      CMD_KERNEL_LD=`parse_opt "$*"`
		      print_info 2 "CMD_KERNEL_LD: $CMD_KERNEL_LD"
	      ;;
	      --kernel-as*)
		      CMD_KERNEL_AS=`parse_opt "$*"`
		      print_info 2 "CMD_KERNEL_AS: $CMD_KERNEL_AS"
	      ;;
	      --kernel-make*)
		      CMD_KERNEL_MAKE=`parse_opt "$*"`
		      print_info 2 "CMD_KERNEL_MAKE: $CMD_KERNEL_MAKE"
	      ;;
	      --utils-cc*)
		      CMD_UTILS_CC=`parse_opt "$*"`
		      print_info 2 "CMD_UTILS_CC: $CMD_UTILS_CC"
	      ;;
	      --utils-ld*)
		      CMD_UTILS_LD=`parse_opt "$*"`
		      print_info 2 "CMD_UTILS_LD: $CMD_UTILS_LD"
	      ;;
	      --utils-as*)
		      CMD_UTILS_AS=`parse_opt "$*"`
		      print_info 2 "CMD_UTILS_AS: $CMD_UTILS_AS"
	      ;;
	      --utils-make*)
		      CMD_UTILS_MAKE=`parse_opt "$*"`
		      print_info 2 "CMD_UTILS_MAKE: $CMD_UTILS_MAKE"
	      ;;
	      --makeopts*)
		      CMD_MAKEOPTS=`parse_opt "$*"`
		      print_info 2 "CMD_MAKEOPTS: $CMD_MAKEOPTS"
	      ;;
	      --mountboot)
		      CMD_MOUNTBOOT=1
		      print_info 2 "CMD_MOUNTBOOT: $CMD_MOUNTBOOT"
	      ;;
	      --no-mountboot)
		      CMD_MOUNTBOOT=0
		      print_info 2 "CMD_MOUNTBOOT: $CMD_MOUNTBOOT"
	      ;;
	      --do-keymap-auto)
		      CMD_DOKEYMAPAUTO=1
		      print_info 2 "CMD_DOKEYMAPAUTO: $CMD_DOKEYMAPAUTO"
	      ;;
	      --no-lvm-2)
		      CMD_NOLVM2=1
		      print_info 2 'CMD_NOLVM2: 1'
	      ;;
	      --bootloader*)
		      CMD_BOOTLOADER=`parse_opt "$*"`
		      print_info 2 "CMD_BOOTLOADER: $CMD_BOOTLOADER"
	      ;;
	      --debuglevel*)
		      CMD_DEBUGLEVEL=`parse_opt "$*"`
		      DEBUGLEVEL="${CMD_DEBUGLEVEL}"
		      print_info 2 "CMD_DEBUGLEVEL: $CMD_DEBUGLEVEL"
	      ;;
	      --menuconfig)
		      TERM_LINES=`stty -a | head -n 1 | cut -d\  -f5 | cut -d\; -f1`
		      TERM_COLUMNS=`stty -a | head -n 1 | cut -d\  -f7 | cut -d\; -f1`

		      if [[ TERM_LINES -lt 19 || TERM_COLUMNS -lt 80 ]]
		      then
			      echo "Error: You need a terminal with at least 80 columns"
			      echo "       and 19 lines for --menuconfig; try --nomenuconfig..."
			      exit 1
		      fi
		      CMD_MENUCONFIG=1
		      print_info 2 "CMD_MENUCONFIG: $CMD_MENUCONFIG"
	      ;;
	      --no-menuconfig)
		      CMD_MENUCONFIG=0
		      print_info 2 "CMD_MENUCONFIG: $CMD_MENUCONFIG"
	      ;;
	      --gconfig)
		      CMD_GCONFIG=1
		      print_info 2 "CMD_GCONFIG: $CMD_GCONFIG"
	      ;;
	      --xconfig)
		      CMD_XCONFIG=1
		      print_info 2 "CMD_XCONFIG: $CMD_XCONFIG"
	      ;;
	      --save-config)
		      CMD_SAVE_CONFIG=1
		      print_info 2 "CMD_SAVE_CONFIG: $CMD_SAVE_CONFIG"
	      ;;
	      --no-save-config)
		      CMD_SAVE_CONFIG=0
		      print_info 2 "CMD_SAVE_CONFIG: $CMD_SAVE_CONFIG"
	      ;;
	      --mrproper)
		      CMD_MRPROPER=1
		      print_info 2 "CMD_MRPROPER: $CMD_MRPROPER"
	      ;;
	      --no-mrproper)
		      CMD_MRPROPER=0
		      print_info 2 "CMD_MRPROPER: $CMD_MRPROPER"
	      ;;
	      --clean)
		      CMD_CLEAN=1
		      print_info 2 "CMD_CLEAN: $CMD_CLEAN"
	      ;;
	      --no-clean)
		      CMD_CLEAN=0
		      print_info 2 "CMD_CLEAN: $CMD_CLEAN"
	      ;;
	      --oldconfig)
		      CMD_CLEAN=0
		      CMD_OLDCONFIG=1
		      print_info 2 "CMD_CLEAN: $CMD_CLEAN"
		      print_info 2 "CMD_OLDCONFIG: $CMD_OLDCONFIG"
	      ;;
	      --bootsplash=*)
		      CMD_BOOTSPLASH=1
		      BOOTSPLASH_THEME=`parse_opt "$*"`
		      print_info 2 "CMD_BOOTSPLASH: $CMD_BOOTSPLASH"
		      print_info 2 "BOOTSPLASH_THEME: $BOOTSPLASH_THEME"
	      ;;
	      --bootsplash)
		      CMD_BOOTSPLASH=1
		      print_info 2 "CMD_BOOTSPLASH: $CMD_BOOTSPLASH"
	      ;;
	      --no-bootsplash)
		      CMD_BOOTSPLASH=0
		      print_info 2 "CMD_BOOTSPLASH: $CMD_BOOTSPLASH"
	      ;;
	      --install)
		      CMD_NOINSTALL=0
		      print_info 2 "CMD_NOINSTALL: $CMD_NOINSTALL"
	      ;;
	      --no-install)
		      CMD_NOINSTALL=1
		      print_info 2 "CMD_NOINSTALL: $CMD_NOINSTALL"
	      ;;
	      --no-initrdmodules)
		      CMD_NOINITRDMODULES=1
		      print_info 2 "CMD_NOINITRDMODULES: $CMD_NOINITRDMODULES"
	      ;;
	      --udev)
		      CMD_UDEV=0
		      print_info 2 "CMD_UDEV: $CMD_UDEV"
	      ;;
	      --callback*)
		      CMD_CALLBACK=`parse_opt "$*"`
		      print_info 2 "CMD_CALLBACK: $CMD_CALLBACK/$*"
	      ;;
	      --tempdir*)
	        TEMP=`parse_opt "$*"`
	        print_info 2 "TEMP: $TEMP"
	      ;; 
	      --arch-override*)
		      CMD_ARCHOVERRIDE=`parse_opt "$*"`
		      print_info 2 "CMD_ARCHOVERRIDE: $CMD_ARCHOVERRIDE"
	      ;;
	      --color)
		      CMD_USECOLOR=1
		      print_info 2 "CMD_USECOLOR: $CMD_USECOLOR"
	      ;;
	      --no-color)
		      CMD_USECOLOR=0
		      print_info 2 "CMD_USECOLOR: $CMD_USECOLOR"
	      ;;
	      --debugfile*)
		      CMD_DEBUGFILE=`parse_opt "$*"`
		      DEBUGFILE=`parse_opt "$*"`
		      print_info 2 "CMD_DEBUGFILE: $CMD_DEBUGFILE"
		      print_info 2 "DEBUGFILE: $CMD_DEBUGFILE"
	      ;;
	      --kerneldir*)
		      CMD_KERNELDIR=`parse_opt "$*"`
		      print_info 2 "CMD_KERNELDIR: $CMD_KERNELDIR"
	      ;;
	      --kernel-config*)
		      CMD_KERNEL_CONFIG=`parse_opt "$*"`
		      print_info 2 "CMD_KERNEL_CONFIG: $CMD_KERNEL_CONFIG"
	      ;;
	      --module-prefix*)
		      CMD_INSTALL_MOD_PATH=`parse_opt "$*"`
		      print_info 2 "CMD_INSTALL_MOD_PATH: $CMD_INSTALL_MOD_PATH"
	      ;;
	      --minkernpackage*)
		      CMD_MINKERNPACKAGE=`parse_opt "$*"`
		      print_info 2 "MINKERNPACKAGE: $CMD_MINKERNPACKAGE"
	      ;;
	      all)
		      BUILD_KERNEL=1
		      BUILD_INITRD=1
	      ;;
	      initrd)
		      BUILD_INITRD=1
	      ;;
	      kernel)
		      BUILD_KERNEL=1
	      ;;
	      --help)
		      longusage
		      exit 1
	      ;;
	      --version)
		      echo "${GK_V}"
		      exit 0
	      ;;
	      *)
		      echo "Error: Unknown option '$*'!"
		      exit 1
	      ;;
	esac
}