#!/bin/sh

### Check for Perl

echo -n "checking for Perl... "

PERL=""
PERLVERSION="0"

for i in [ /usr/bin/perl /usr/local/bin/perl /bin/perl ]; do
	if test -x $i; then
		PERL=$i
		PERLVERSION=`$PERL -e "print $]" 2>&1`
		echo "found $PERLVERSION ($PERL)"
		break
	fi
done;

if [ "$PERL" == "" ]; then
	echo "missing"
	echo "You can get Perl at http://www.perl.org"
	exit
fi

if [ "$PERLVERSION" \<  "5.00400" ]; then
	echo "We need Perl >= 5.004. You can get Perl at http://www.perl.org"
	exit
fi

### Check for Net::DNS

echo -n "checking for Net::DNS... "

NETDNS=""
NETDNSVERSION="0"

INC=`$PERL -e "print join(' ', @INC)"`
for i in $INC; do
	i=$i/Net/DNS.pm
	if test -f $i; then
		NETDNS=$i
		NETDNSVERSION=`$PERL -e "use Net::DNS;print Net::DNS->version" 2>&1`
		echo "found $NETDNSVERSION ($NETDNS)"
		break
	fi
done;

if [ "$NETDNS" == "" ]; then
	echo "missing"
	echo "You can get Net::DNS at http://www.cpan.org"
	exit
fi

if [ "$NETDNSVERSION" \<  "0.12" ]; then
	echo "We need Net::DNS >= 0.12. You can get Net::DNS at http://www.cpan.org"
	exit
fi

### Check for install

echo -n "checking for install... "

INSTALL=""
INSTALLVERSION=""

for i in [ /usr/bin/install /usr/local/bin/install /bin/install ]; do
	if test -x $i; then
		INSTALL=$i
		INSTALLVERSION=`install --version | head -n 1 | sed -e "s/[^0-9]*\([0-9]*\.[0-9]*[a-z]*\)$/\1/" 2>&1 `
		echo "found $INSTALLVERSION ($INSTALL)"
		break
	fi
done;

if [ "$INSTALL" == "" ]; then
	echo "missing"
	echo "You can get install from the fileutils package at ftp://ftp.gnu.org"
	exit
fi

if [ "$INSTALLVERSION" \<  "3.0" ]; then
	echo "We need install >= 3.0. You can get install from the fileutils package at ftp://ftp.gnu.org"
	exit
fi

### Create the output files

echo "creating Makefile"

cp Makefile.in Makefile

echo "creating jdresolve"

sed -e "s|^#\!/usr/bin/perl|#\!$PERL|" < jdresolve.in > jdresolve
chmod 755 jdresolve

echo ""

echo "Done. Type \"make install\" to install jdresolve."