#!/bin/sh

set -e

help() {
	cat <<HELP
This script tries to be similar to autotools' \`configure', but is different.

Usage: ./configure [OPTION]...

Defaults for the options are specified in brackets.

Configuration:
  -h, --help              Display this help and exit

Installation directories:
  --prefix PREFIX         install architecture-independent files in PREFIX
                          [/usr/local]
  --exec-prefix EPREFIX   install architecture-dependent files in EPREFIX
                          [PREFIX]

By default, \`make install' will install all the files in
\`/usr/local/bin', \`/usr/local/lib' etc. You can specify
an installation prefix other than \`/usr/local' using \`--prefix',
for instance \`--prefix \$HOME'.

For better control, use the options below.

File tuning of the installation directories:
  --bindir DIR            user executables [EPREFIX/bin]
  --datarootdir DIR       read-only arch.-independent data root [PREFIX/share]
  --mandir DIR            man documentation [DATAROOTDIR/man]

Optional Features:
  --enable-gnome-terminal use GNOME Terminal instead of ptterm
  --disable-xinerama      disable Xinerama
HELP
}

prefix='/usr/local'
eprefix=''
bindir=''
datarootdir=''
mandir=''
enable_gnome_terminal='no'
enable_xinerama='yes'

while [ $# -gt 0 ]; do
	case "$1" in
		-h | -? | --help | -help | help)
			help
			exit
			;;
		--prefix)
			shift
			prefix="$1"
			;;
		--exec-prefix)
			shift
			eprefix="$1"
			;;
		--bindir)
			shift
			bindir="$1"
			;;
		--datarootdir)
			shift
			datarootdir="$1"
			;;
		--mandir)
			shift
			mandir="$1"
			;;
		--enable-gnome-terminal)
			enable_gnome_terminal='yes'
			;;
		--disable-xinerama)
			enable_xinerama='no'
			;;
		*)
			help
			exit
			;;
	esac

	shift
done

if [ "$eprefix" = '' ]; then
	eprefix="$prefix"
fi

if [ "$bindir" = '' ]; then
	bindir="$eprefix/bin"
fi

if [ "$datarootdir" = '' ]; then
	datarootdir="$prefix/share"
fi

if [ "$mandir" = '' ]; then
	mandir="$datarootdir/man"
fi

echo "PREFIX                = $prefix"
echo "EPREFIX               = $eprefix"
echo "BINDIR                = $bindir"
echo "DATAROOTDIR           = $datarootdir"
echo "MANDIR                = $mandir"
echo "ENABLE_GNOME_TERMINAL = $enable_gnome_terminal"
echo "ENABLE_XINERAMA       = $enable_xinerama"

touch 'config/1-custom.mk'
touch 'config/3-custom.mk'
touch 'config/5-custom.mk'

cat > 'config/2-generated.mk' << MAKE
PREFIX                = $prefix
EPREFIX               = $eprefix
BINDIR                = $bindir
DATAROOTDIR           = $datarootdir
MANDIR                = $mandir
ENABLE_GNOME_TERMINAL = $enable_gnome_terminal
ENABLE_XINERAMA       = $enable_xinerama
MAKE

make_help_result="$(make --help 2>&1 || true)"
if [ "$(echo "$make_help_result" | grep 'gnu.org')" = '' ]; then
	ln -sf '4-defvars-bsd.mk' 'config/4-defvars.mk'
else
	ln -sf '4-defvars-gnu.mk' 'config/4-defvars.mk'
fi