configure

#!/bin/sh
CC="cc"
# Always enabled and cannot be disabled. If your code depends on these features it's either C89 or you have a massive skill issue
CFLAGS="-std=c99 -Werror=implicit-function-declaration -Werror=implicit-int"

AR="ar"
RANLIB="ranlib"
prefix="/usr/local"
exec_prefix="$prefix"
bindir="$exec_prefix/bin"
libdir="$prefix/lib"
includedir="$prefix/include"
platform="c"
indev=0

fatal_error(){
	echo "Error: $@!"
	echo "Notice: If you're not a project maintainer, this is a bug. Please report this to the project maintainers."
	exit 1
}

update_prefixes(){
	if [ "$1" = "" ]; then
		exec_prefix="$prefix"
	fi
	bindir="$exec_prefix/bin"
	libdir="$prefix/lib"
	includedir="$prefix/include"
}

generate_config(){
	if [ ! -f ./defaults.conf ]; then
		fatal_error "Defaults file is missing"
	fi

	. ./defaults.conf

	if [ "$main_project" = "" ]; then
		fatal_error "Main project field is empty"
	elif [ $(echo "$main_project" | grep -c '|') -lt 1 ]; then
		fatal_error "Invalid main project field"
	fi

	echo "Checking install prefix...$prefix"
	echo "Checking executable install prefix...$exec_prefix"
	echo "Checking binary install prefix...$bindir"
	echo "Checking library install prefix...$libdir"
	echo "Checking headers install prefix...$includedir"
	printf "Detecting target system..."
	if [ "$target" = "" ]; then
		echo "native."
	else
		echo "$target."
	fi
	printf "Detecting C compiler..."
	compiler_check="$(realpath $(command -v $CC))"
	if [ $(echo "$compiler_check" | grep clang -c) -ne 0 ]; then
		echo "clang"
		if [ "$target" != "" ]; then
			CFLAGS="--target=$target $CFLAGS"
		fi
	elif [ $(echo "$compiler_check" | grep gcc -c) -ne 0 ]; then
		echo "gcc"
		if [ $(echo $(basename $CC) | grep "$target" -c) -eq 0 ]; then
			compile_dir="$(dirname $CC)"
			compile_name="$(basename $CC)"

			if [ "$compile_dir" != "." ]; then
				CC="$compile_dir/"
			else
				CC=""
			fi

			CC="$CC$target-$compile_name"
		fi
	else
		echo "$CC"
	fi
	echo "Compiler flags set...$CFLAGS"
	if [ "$LDFLAGS" != "" ]; then
		echo "Linker flags set...$LDFLAGS"
	fi

	compile_config_str="CC=\"$CC\"\nCFLAGS=\"$CFLAGS\"\nAR=\"$AR\"\nRANLIB=\"$RANLIB\"\n"
	install_config_str="prefix=\"$prefix\"\nexec_prefix=\"$exec_prefix\"\nbindir=\"$bindir\"\nlibdir=\"$libdir\"\nincludedir=\"$includedir\"\n"

	if [ "$LDFLAGS" != "" ]; then
		compile_config_str="LDFLAGS=\"$LDFLAGS\"\n$compile_config_str"
	fi

	if [ $indev -eq 1 ]; then
		src="$src $src_indev"
	fi

	printf "$compile_config_str\n$install_config_str\n" > ./.config
	printf "main_project=\"$main_project\"\n\n" >> ./.config

	if [ -f ./custom.conf ]; then
		cat custom.conf >> ./.config
	fi
}

update_prefixes

while [ $# -ne 0 ]; do
	case $1 in
		--prefix | --prefix=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				prefix="$(echo $1 | cut -d= -f2)"
			else
				prefix="$2"
				shift
			fi
			update_prefixes
			;;
		--exec-prefix | --exec-prefix=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				exec_prefix="$(echo $1 | cut -d= -f2)"
			else
				exec_prefix="$2"
				shift
			fi
			update_prefixes exec
			;;
		--bindir | --bindir=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				bindir="$(echo $1 | cut -d= -f2)"
			else
				bindir="$2"
				shift
			fi
			;;
		--libdir | --libdir=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				libdir="$(echo $1 | cut -d= -f2)"
			else
				libdir="$2"
				shift
			fi
			;;
		--includedir | --includedir=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				includedir="$(echo $1 | cut -d= -f2)"
			else
				includedir="$2"
				shift
			fi
			;;
		--target | --target=*)
			if [ $(echo $1 | grep "=" -c) -ne 0 ]; then
				target="$(echo $1 | cut -d= -f2)"
			else
				target="$2"
				shift
			fi
			;;
		--enable-indev)
			indev=1
			;;
		--enable-w*)
			CFLAGS="$CFLAGS -Wall"

			if [ "$1" = "--enable-wextra" ] || [ "$1" = "--enable-werror" ]; then
				CFLAGS="$CFLAGS -Wextra"
			fi

			if [ "$1" = "--enable-werror" ]; then
				CFLAGS="$CFLAGS -Werror"
			fi
			;;
		--help | --*)
			printf "PocketLinux32's Generic C99 Configure System v0.05\n\n"
			printf "Usage: $0 [OPTIONS]...\n\n"
			echo "Install Options"
			echo "--prefix=DIR			Set install path (default=/usr/local)"
			echo "--exec-prefix=DIR		Sets executable install path (default=prefix)"
			echo "--bindir=DIR			Set binary install path (default=exec_prefix/bin)"
			echo "--libdir=DIR			Set library install path (default=prefix/lib)"
			echo "--includedir=DIR		Set include headers install path (default=prefix/include)"
			printf "\nCompile Options\n"
			echo "--target=TARGET			Set the target system"
			echo "--enable-nonportable		Compile platform-specific modules/source files"
			echo "--enable-indev			Compile incomplete modules/source files"
			echo "--enable-wall			Compile with -Wall"
			echo "--enable-wextra			Compile with -Wextra (enables -Wall)"
			echo "--enable-werror			Compile with -Werror (enables -Wall -Wextra)"
			printf "\nInfluential Environment Variables\n"
			echo "  CC				C compiler"
			echo "  CFLAGS			Flags passed to the C compiler"
			echo "  LDFLAGS			FLags passed to the linker"
			echo "  AR				Archival tool for creating static libraries"
			echo "  RANLIB			Like AR, but indexes symbols in an AR archive"
			exit 0
			;;
		CC=*)
			CC=$(echo $1 | cut -d= -f2)
			;;
		CFLAGS=*)
			CFLAGS="$CFLAGS $(echo $1 | cut -d= -f2-)"
			;;
		LDFLAGS=*)
			LDFLAGS="$(echo $1 | cut -d= -f2-)"
			;;
		AR=*)
			AR=$(echo $1 | cut -d= -f2)
			;;
		RANLIB=*)
			RANLIB=$(echo $1 | cut -d= -f2)
			;;
	esac
	shift
done

generate_config