#!/bin/sh

## $Id$

## ---------- some portability checks/adjustments [stolen from configure] ----------
## 'echo -n' is not portable..
case `echo "testing\c"; echo 1,2,3`,`echo -n testing; echo 1,2,3` in
  *c*,-n*) ECHO_N= ECHO_C='
' ECHO_T='	' ;;
  *c*,*  ) ECHO_N=-n ECHO_C= ECHO_T= ;;
  *)       ECHO_N= ECHO_C='\c' ECHO_T= ;;
esac
##----------

## ----------------------------------------------------------------------
## Check that given command $1 has version >= $2.$3
## return 0 if ok, 1 too old or not found  (-> shell conventions).
## ----------------------------------------------------------------------
check_version()
{
    local foundit
    ## get current version of $1
    echo $ECHO_N "Checking version of '$1' >= $2.$3... $ECHO_C"
    fullpath=`type -p $1`;
    if [ -x "$fullpath" ]; then
	foundit=yes;
    fi

    if [ "$foundit" != yes ]; then 
	echo "Didn't find application";
	ac_major=0; ac_minor=0; 
    else
	cmdline="$fullpath --version 2> /dev/null";
	version=`$cmdline`;
	if [ -n "${version}" ]; then
	    ## HACK: the pre-pended space "x " is important for the following regexp 
	    ## to always work even if the version-number comes back without text prepended
	    version="x ${version}"
	else
	    version=0
	fi
	ac_major=`echo $version | sed 's/.* v*\([0-9]*\)[.]\([0-9]*\).*/\1/g'`
	ac_minor=`echo $version | sed 's/.* v*\([0-9]*\)[.]\([0-9]*\).*/\2/g'`
    fi

    if [ ${ac_major} -ge $2 ] && [ ${ac_minor} -ge $3 ]; then
	echo "ok. (${ac_major}.${ac_minor})"
	return 0;
    else
	echo "failed. (${ac_major}.${ac_minor})"
	return 1;
    fi

} ## check_version()


## --------------------------------------------------------------------------------
## 'MAIN' starts here 
## --------------------------------------------------------------------------------
echo "Bootstrapping configure script and makefiles:"

## ---------- first check santity of the installed versions of the build-system

## some sorry systems don't have proper GNU-make... build one
if ! check_version make 3 79; then
    echo "Couldn't find a new-enough version of GNU 'make', please install one!";
    exit 1;
    # build_lsc_aux "make-3.80"
fi

## FreeBSD's m4 seems to be broken? Download a fresh one
if ! check_version m4 1 4; then
    echo "Couldn't find a new-enough version of 'm4', please install one!";
    exit 1;
    # build_lsc_aux "m4-1.4.1"
fi

if ! check_version libtool 1 4; then
    echo "Couldn't find a new-enough version of 'libtool', please install one!";
    exit 1;
    # build_lsc_aux "libtool-1.5.6"
fi

if ! check_version pkg-config 0 15; then
    echo "Couldn't find a new-enough version of 'pkg-config', please install one!";
    exit 1;
    # build_lsc_aux "pkgconfig-0.15.0"
fi

if ! check_version autoconf 2 58; then
    echo "Couldn't find a new-enough version of 'autoconf', please install one!";
    echo "If you have a newer version, set the environment-variable 'AUTOCONF' to its path";
    exit 1;
    # build_lsc_aux "autoconf-2.59"
fi
if ! check_version automake 1 8; then
    echo "Couldn't find a new-enough version of 'automake', please install one!";
    echo "If you have a newer version, set the environment-variable 'AUTOMAKE' to its path";
    exit 1;
    # build_lsc_aux "automake-1.8.5"
fi

## ---------- ok, now run aclocal, automake, autohead and autoconf
cmdline="aclocal -I m4 && autoheader && automake && autoconf";
echo "$cmdline"
if eval $cmdline; then
    echo "Done, now run ./configure"
    echo " ./configure -C                         to enable caching"
    echo " ./configure --enable-maintainer-mode   to enable maintainer depedencies"
    exit 0
else
    echo "Something failed .... please check error-message and re-run when fixed."
    echo "exiting..."
    exit 1
fi