#! /bin/sh

VERSION=0.1

# parse --prefix=PREFIX, mainly for GuixSD/Debian
cmdline=$(echo "$@")
PREFIX=${cmdline##*--prefix=}
PREFIX=${PREFIX% *}
PREFIX=${PREFIX% -*}
if [ -z "$PREFIX" ]; then
   PREFIX=/usr/local
fi

BASH=$(command -v bash)
GUILE=${GUILE-$(command -v guile)}
GUILD=${GUILD-$(command -v guild || command -v guile-tools)}
guile_site_dir=$PREFIX/share/guile/site/$guile_effective_version
guile_site_ccache_dir=$PREFIX/lib/guile/$guile_effective_version/site-ccache
guile_effective_version=$(guile -c '(display (effective-version))')
MAKEINFO=$(command -v makeinfo)
GEESH_PREFIX=${GEESH_PREFIX-$HOME/src/geesh}
if [ -d $GEESH_PREFIX ]; then
    GUILE_LOAD_PATH=$GEESH_PREFIX:$GUILE_LOAD_PATH
    GUILE_LOAD_COMPILED_PATH=$GEESH_PREFIX:$GUILE_LOAD_COMPILED_PATH
    if ! $GUILE -c '(use-modules (geesh parser)) (exit (defined? '"'"'read-sh-all))'; then
        echo "warning: building without Geesh"
    fi
fi

if [ "$srcdir" = . ]; then
    top_builddir=.
else
    srcdest=${srcdest}
    top_builddir=$PWD
fi
abs_top_srcdir=${abs_top_srcdir-$(cd ${srcdir} && pwd)}
abs_top_builddir=$PWD

cat > .config.make <<EOF
BASH=$BASH
GUILE=$GUILE
GUILD=$GUILD
prefix=$PREFIX
bindir=$PREFIX/bin
docdir=$PREFIX/share/doc/gash
guile_effective_version=$guile_effective_version
guile_site_dir=$guile_site_dir
guile_site_ccache_dir=$guile_site_ccache_dir
MAKEINFO=$MAKEINFO
SHELL=$BASH
VERSION=$VERSION
EOF

BZIP2=$(command -v bzip2)
COMPRESS=$(command -v compress)
[ -z "$COMPRESS" ] && COMPRESS=$PWD/bin/compress
GZIP=$(command -v gzip)
XZ=$(command -v xz)

subst () {
    sed \
    -e s,"@srcdest@,$srcdest,"\
    -e s,"@srcdir@,$srcdir,"\
    -e s,"@abs_top_srcdir@,$abs_top_srcdir,"\
    -e s,"@abs_top_builddir@,$abs_top_builddir,"\
    -e s,"@top_builddir@,$top_builddir,"\
    -e s",@BASH@,$BASH,"\
    -e s",@GUILE@,$GUILE,"\
    -e s,"@prefix@,$prefix,"\
    -e s",@guile_site_dir@,$guile_site_dir,"\
    -e s",@guile_site_ccache_dir@,$guile_site_ccache_dir,"\
    -e s",@BZIP2@,$BZIP2,"\
    -e s",@COMPRESS@,$COMPRESS,"\
    -e s",@GZIP@,$GZIP,"\
    -e s",@XZ@,$XZ,"\
    -e s",@VERSION@,$VERSION,"\
    -e s",@guile_site_dir@,$guile_site_dir,"\
    -e s",@guile_site_ccache_dir@,$guile_site_ccache_dir,"\
    -e s",@builtin@,$builtin,"\
    $1 > $2
}

SHELLS="
bash
gash
sh
"

for shell in $SHELLS; do
    subst ${srcdest}scripts/gash.in scripts/$shell
    chmod +x scripts/$shell
done

BUILTINS="
basename
cat
chmod
compress
cp
dirname
find
grep
ls
mkdir
mv
reboot
rm
rmdir
sed
tar
touch
tr
wc 
which
"
for builtin in $BUILTINS; do
    subst ${srcdest}bin/builtin.in bin/$builtin
    chmod +x bin/$builtin
done

subst ${srcdest}gash/config.scm.in gash/config.scm
subst ${srcdest}build-aux/pre-inst-env.in pre-inst-env
chmod +x pre-inst-env

cat <<EOF
Run:
  make            to build gash
  make help       for help on other targets
EOF