#! /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=$(command -v bash)
GUILE=$(command -v guile)
GUILE_TOOLS=$(command -v guile-tools)
GUILE_SITE_DIR=$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 "your geesh is too old"
        exit 1
    fi
fi

sed \
    -e s,@GUILE@,$GUILE,\
    -e s,@GUILE_SITE_DIR@,$GUILE_SITE_DIR,\
    -e s,@GUILE_SITE_CCACHE_DIR@,$GUILE_SITE_CCACHE_DIR,\
    bin/gash.in > bin/gash
chmod +x bin/gash
BUILTINS="
cat
cp
find
grep
ls
reboot
tar
wc 
which
"
for builtin in $BUILTINS; do
    sed \
        -e s,@GUILE@,$GUILE,\
        -e s,@GUILE_SITE_DIR@,$GUILE_SITE_DIR,\
        -e s,@GUILE_SITE_CCACHE_DIR@,$GUILE_SITE_CCACHE_DIR,\
        -e s,@builtin@,$builtin,\
    bin/builtin.in > bin/$builtin
    chmod +x bin/$builtin
done
cat > .config.make <<EOF
BASH=$BASH
GUILE=$GUILE
GUILE_TOOLS=$GUILE_TOOLS
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

sed \
    -e "s,@VERSION@,$VERSION,"\
    gash/config.scm.in > gash/config.scm

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