gint/configure

#! /bin/bash

#
#  Basic configuration
#

declare -A conf

# Target platform
conf_target=

# Behavior
conf[GINT_BOOT_LOG]=
conf[GINT_NO_SYSCALLS]=
conf[GINT_EXTENDED_LIBC]=
conf[GINT_STATIC_GRAY]=

# Size limits
conf[ATEXIT_MAX]=16
conf[TIMER_SLOTS]=16
conf[EVENTS_QUEUE_SIZE]=64

# Output files
output="config/Makefile.cfg"

#
#  Help screen and output util
#

error="\e[31;1merror:\e[0m"
C_="$(echo -e '\e[30;1m')"
Cr="$(echo -e '\e[31;1m')"
Cg="$(echo -e '\e[32;1m')"
Cp="$(echo -e '\e[34;1m')"
C0="$(echo -e '\e[0m')"

help()
{
	cat << EOF
Configuration script for the gint library.
Usage: $0 [options...]

Required settings:
  $Cr--target$C0=${Cg}fx9860g$C0,${Cg}fxcg50$C0
    Select the target platform, either ${Cg}fx9860g$C0 for monochrome
    calculators, or ${Cg}fxcg50$C0 for Prizm calculators.

Options that affect the behavior of the library:
  $Cr--boot-log $C_[default:$Cp not specified$C_]$C0
    Enable an on-screen log at startup if a key is kept pressed while launching
    the add-in, allowing easy debug and crash diagnoses.
  $Cr--no-syscalls $C_[default:$Cp not specified$C_]$C0
    Never use syscalls. Expect trouble with malloc() and the gray engine. Do
    not trigger this switch unless you know what you are doing.
  $Cr--extended-libc $C_[default:$Cp not specified$C_]$C0
    Enable specific C99 headers/features that are normally not required by
    calculator programs. This may allow porting programs from other platforms.
  $Cr--static-gray-engine $C_[default:$Cp not specified$C_]$C0
    Place the gray engine vram in static ram instead of using the heap. Always
    use this option when using both the gray engine and --no-syscalls.

Options that customize size limits:
  $Cr--atexit-max$C0=${Cg}integer$C_ [default:$Cp 16$C_]$C0
    Number of exit handlers that can be registered by atexit().
  $Cr--timer-slots$C0=${Cg}integer$C_ [default:$Cp 16$C_]$C0
    Number of virtual timers that may be registered at the same time.
  $Cr--events-queue-size$C0=${Cg}integer$C_ [default:$Cp 64$C_]$C0
    Number of events simultaneously stored in the event queue.
EOF

	exit 0
}

#
#  Parsing arguments
#

fail=false
for arg; do case "$arg" in
	-h | -? | --help) help;;

	--target=*)
		conf_target=${arg#*=}
		if [[ $conf_target = "fx9860g" ]]; then
			conf_target="GINT_FX9860G"
		else if [[ $conf_target = "fxcg50" ]]; then
			conf_target="GINT_FXCG50"
		else
			echo -e "$error Invalid target. See $0 --help."
			fail=true;
		fi; fi;;

	--boot-log)		conf[GINT_BOOT_LOG]=true;;
	--no-syscalls)		conf[GINT_NO_SYSCALLS]=true;;
	--extended-libc)	conf[GINT_EXTENDED_LIBC]=true;;
	--static-gray-engine)	conf[GINT_STATIC_GRAY]=true;;

	--atexit-max=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[ATEXIT_MAX]=$size
		else echo -e "$error --atexit-max expects an integer value"
			fail=true; fi;;
	--timer-slots=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[TIMER_SLOTS]=$size
		else echo -e "$error --timer-slots expects an integer value"
			fail=true; fi;;
	--events-queue-size=*)
		size=${arg#*=}
		if [[ $size == +([0-9]) ]]; then
			conf[EVENTS_QUEUE_SIZE]=$size
		else echo -e "$error --events-queue-size expects an integer"\
			"value"
			fail=true; fi;;

	--atexit-max | --timer-slots | --events-queue-size)
		echo -e "$error syntax for $arg is $arg=<integer-value>";;

	*)
		echo -e "$error unrecognized argument '$arg'"; fail=true;;
esac; done

#
#  Checking mandatory arguments
#

if [[ ! $conf_target ]]; then
	echo -e "$error No target specified. See $0 --help."
	fail=true;
fi

#
#  Output config
#

output_config()
{
	echo -n "cfg_defs ="
	echo -n " -D$conf_target"

	[ "${conf[GINT_BOOT_LOG]}"      ] && echo -n " -DGINT_BOOT_LOG"
	[ "${conf[GINT_NO_SYSCALLS]}"   ] && echo -n " -DGINT_NO_SYSCALLS"
	[ "${conf[GINT_EXTENDED_LIBC]}" ] && echo -n " -DGINT_EXTENDED_LIBC"
	[ "${conf[GINT_STATIC_GRAY]}"   ] && echo -n " -DGINT_STATIC_GRAY"

	echo -n " -DATEXIT_MAX=${conf[ATEXIT_MAX]}"
	echo -n " -DTIMER_SLOTS=${conf[TIMER_SLOTS]}"
	echo -n " -DEVENTS_QUEUE_SIZE=${conf[EVENTS_QUEUE_SIZE]}"

	echo ""

	[ "${conf[GINT_EXTENDED_LIBC]}" != "" ] && echo "cfg_ext = true"
}

if $fail; then
	echo "Output file $output has not been modified."
else
	mkdir -p config
	output_config > $output
	echo "Configuration saved in $output, ready to make!"
fi