Template for ./configure-scripts in (hopefully) POSIX shell

configure-template.sh

#!/bin/sh

usage() {
	printf "Usage: %s [options]\n" "${0}"
	echo ""
	echo "Options: "
	printf "  --help or -h                    "
	echo "Display this help message"
	printf "  --prefix=PREFIX                 "
	echo "Top level install directory is PREFIX [default /usr/local]"
	printf "  --bindir=BINDIR                 "
	echo "Install executables to BINDIR [default /usr/local/bin]"
	printf "  --sbindir=SBINDIR               "
	echo "Install system administrator executables to SBINDIR [default /usr/local/sbin]"
	printf "  --libexecdir=LIBEXECDIR         "
	echo "Install program executables to LIBEXECDIR [default /usr/local/libexec]"
	printf "  --sysconfdir=SYSCONFDIR         "
	echo "Install configurations to SYSCONFDIR [default /usr/local/etc]"
	printf "  --sharedstatedir=SHAREDSTATEDIR "
	echo "Modifiable architecture-independent data goes to SHAREDSTATEDIR [default /usr/local/com]"
	printf "  --localstatedir=LOCALSTATEDIR   "
	echo "Modifiable data of the program goes to LOCALSTATEDIR [default /usr/local/var]"
	printf "  --libdir=LIBDIR                 "
	echo "Install program libraries to LIBDIR [default /usr/local/lib]"
	printf "  --includedir=INCLUDEDIR         "
	echo "Install program headers to INCLUDEDIR [default /usr/local/include]"
	printf "  --datarootdir=DATAROOTDIR       "
	echo "Install read-only program data to DATAROOTDIR [default /usr/local/share]"
	printf "  --datadir=DATADIR               "
	echo "Install read-only program data to DATADIR [default /usr/local/share]"
	printf "  --mandir=MANDIR                 "
	echo "Install manuals to MANDIR [default /usr/local/share/man]"
}

for arg in "$@"; do
	case "$arg" in
		--prefix=*)
			PREFIX="${arg#*=}"
			;;
		--bindir=*)
			BINDIR="${arg#*=}"
			;;
		--sbindir=*)
			SBINDIR="${arg#*=}"
			;;
		--libexecdir=*)
			LIBEXECDIR="${arg#*=}"
			;;
		--sysconfdir=*)
			SYSCONFDIR="${arg#*=}"
			;;
		--sharedstatedir=*)
			SHAREDSTATEDIR="${arg#*=}"
			;;
		--localstatedir=*)
			LOCALSTATEDIR="${arg#*=}"
			;;
		--libdir=*)
			LIBDIR="${arg#*=}"
			;;
		--includedir=*)
			INCLUDEDIR="${arg#*=}"
			;;
		--datarootdir=*)
			DATAROOTDIR="${arg#*=}"
			;;
		--datadir=*)
			DATADIR="${arg#*=}"
			;;
		--mandir=*)
			MANDIR="${arg#*=}"
			;;
		--help|-h)
			usage
			exit 1
			;;
		*)
			;;
	esac
done

PREFIX="${PREFIX:-/usr/local}"
BINDIR="${BINDIR:-${PREFIX}/bin}"
SBINDIR="${BINDIR:-${PREFIX}/sbin}"
LIBEXECDIR="${LIBEXECDIR:-${PREFIX}/libexec}"
SYSCONFDIR="${SYSCONFDIR:-${PREFIX}/etc}"
SHAREDSTATEDIR="${SHAREDSTATEDIR:-${PREFIX}/com}"
LOCALSTATEDIR="${LOCALSTATEDIR:-${PREFIX}/var}"
LIBDIR="${LIBDIR:-${PREFIX}/lib}"
INCLUDEDIR="${INCLUDEDIR:-${PREFIX}/include}"
DATAROOTDIR="${DATAROOTDIR:-${PREFIX}/share}"
DATADIR="${DATADIR:-${DATAROOTDIR}}"
MANDIR="${MANDIR:-${DATAROOTDIR}/man}"

CC="${CC:-cc}"
CFLAGS="${CFLAGS:--Og -g}"
LDFLAGS="${LDFLAGS:-}"

# Add checks for things like pkg-config and such here, since this is as
# convenient a place as any.

cat << EOF > config.vars
PREFIX="${PREFIX}"
BINDIR="${BINDIR}"
SBINDIR="${SBINDIR}"
LIBEXECDIR="${LIBEXECDIR}"
SYSCONFDIR="${SYSCONFDIR}"
SHAREDSTATEDIR="${SHAREDSTATEDIR}"
LOCALSTATEDIR="${LOCALSTATEDIR}"
LIBDIR="${LIBDIR}"
INCLUDEDIR="${INCLUDEDIR}"
DATAROOTDIR="${DATAROOTDIR}"
DATADIR="${DATADIR}"
MANDIR="${MANDIR}"

CC="${CC}"
CFLAGS="${CFLAGS}"
LDFLAGS="${LDFLAGS}"
EOF