c@50: #!/bin/bash
c@50: 
c@50: # Disable shellcheck warnings for useless-use-of-cat. UUOC is good
c@50: # practice, not bad: clearer, safer, less error-prone.
c@50: # shellcheck disable=SC2002
c@50: 
c@50: sml="$VEXT_SML"
c@50: 
c@50: set -eu
c@50: 
c@50: mydir=$(dirname "$0")
c@50: program="$mydir/vext.sml"
c@50: 
c@53: hasher=
c@53: local_install=
c@53: if [ -w "$mydir" ]; then
c@53:     if echo | sha256sum >/dev/null 2>&1 ; then
c@53: 	hasher=sha256sum
c@53:         local_install=true
c@53:     elif echo | shasum >/dev/null 2>&1 ; then
c@53: 	hasher=shasum
c@53: 	local_install=true
c@53:     else
c@53:         echo "WARNING: sha256sum or shasum program not found" 1>&2
c@53:     fi
c@53: fi
c@53: 
c@53: if [ -n "$local_install" ]; then
c@53:     hash=$(echo "$sml" | cat "$program" - | $hasher | cut -c1-16)
c@53:     gen_sml=$mydir/.vext-$hash.sml
c@53:     gen_out=$mydir/.vext-$hash.bin
c@53:     trap 'rm -f $gen_sml' 0
c@53: else
c@53:     gen_sml=$(mktemp /tmp/vext-XXXXXXXX.sml)
c@53:     gen_out=$(mktemp /tmp/vext-XXXXXXXX.bin)
c@53:     trap 'rm -f $gen_sml $gen_out' 0
c@53: fi
c@53: 
c@53: if [ -x "$gen_out" ]; then
c@53:     exec "$gen_out" "$@"
c@53: fi
c@53: 
c@50: # We need one of Poly/ML, SML/NJ, or MLton. Since we're running a
c@50: # single-file SML program as if it were a script, our order of
c@53: # preference is based on startup speed, except in the local_install
c@53: # case where we retain a persistent binary.
c@50: 
c@50: if [ -z "$sml" ]; then
c@53:     if [ -n "$local_install" ] && mlton 2>&1 | grep -q 'MLton'; then
c@53: 	sml="mlton"
c@53:     elif sml -h 2>&1 | grep -q 'Standard ML of New Jersey'; then
c@50: 	sml="smlnj"
c@50:     # We would prefer Poly/ML to SML/NJ, except that Poly v5.7 has a
c@50:     # nasty bug that occasionally causes it to deadlock on startup.
c@50:     # That appears to be fixed in their repo, so we could promote it
c@50:     # up the order again at some point in future
c@50:     elif echo | poly -v 2>/dev/null | grep -q 'Poly/ML'; then
c@50: 	sml="poly"
c@50:     elif mlton 2>&1 | grep -q 'MLton'; then
c@50: 	sml="mlton"
c@50:     else cat 1>&2 <<EOF
c@50: 
c@50: ERROR: No supported SML compiler or interpreter found       
c@50: EOF
c@50: 	cat <<EOF
c@50: 
c@50:   The Vext external source code manager needs a Standard ML (SML)
c@50:   compiler or interpreter to run.
c@50: 
c@50:   Please ensure you have one of the following SML implementations
c@50:   installed and present in your PATH, and try again.
c@50: 
c@50:     1. Standard ML of New Jersey
c@50:        - often found in a distribution package called: smlnj
c@50:        - executable name: sml
c@50: 
c@50:     2. Poly/ML
c@50:        - often found in a distribution package called: polyml
c@50:        - executable name: poly
c@50: 
c@50:     3. MLton
c@50:        - often found in a distribution package called: mlton
c@50:        - executable name: mlton
c@50: 
c@50: EOF
c@50: 	exit 2
c@50:     fi
c@50: fi
c@50: 
c@50: arglist=""
c@50: for arg in "$@"; do
c@50:     if [ -n "$arglist" ]; then arglist="$arglist,"; fi
c@50:     if echo "$arg" | grep -q '[^a-z]' ; then
c@50: 	arglist="$arglist\"usage\""
c@50:     else
c@50: 	arglist="$arglist\"$arg\""
c@50:     fi
c@50: done
c@50: 
c@50: case "$sml" in
c@53:     poly)
c@53:         if [ -n "$local_install" ] && polyc --help >/dev/null 2>&1 ; then
c@53:             if [ ! -x "$gen_out" ]; then
c@53:                 polyc -o "$gen_out" "$program"
c@53:             fi
c@53: 	    "$gen_out" "$@"
c@53:         else
c@53:             echo 'use "'"$program"'"; vext ['"$arglist"'];' |
c@53:                 poly -q --error-exit
c@53:         fi ;;
c@50:     mlton)
c@53:         if [ ! -x "$gen_out" ]; then
c@53: 	    echo "val _ = main ()" | cat "$program" - > "$gen_sml"
c@53: 	    mlton -output "$gen_out" "$gen_sml"
c@53:         fi
c@53: 	"$gen_out" "$@" ;;
c@50:     smlnj)
c@50: 	cat "$program" | (
c@50: 	    cat <<EOF
c@50: val smlrun__cp = 
c@50:     let val x = !Control.Print.out in
c@50:         Control.Print.out := { say = fn _ => (), flush = fn () => () };
c@50:         x
c@50:     end;
c@50: val smlrun__prev = ref "";
c@50: Control.Print.out := { 
c@50:     say = fn s => 
c@50:         (if String.isSubstring " Error" s
c@50:          then (Control.Print.out := smlrun__cp;
c@50:                (#say smlrun__cp) (!smlrun__prev);
c@50:                (#say smlrun__cp) s)
c@50:          else (smlrun__prev := s; ())),
c@50:     flush = fn s => ()
c@50: };
c@50: EOF
c@50: 	    cat -
c@50: 	    cat <<EOF
c@50: val _ = vext [$arglist];
c@50: val _ = OS.Process.exit (OS.Process.success);
c@50: EOF
c@53:             ) > "$gen_sml"
c@53: 	CM_VERBOSE=false sml "$gen_sml" ;;
c@50:     *)
c@50: 	echo "Unknown SML implementation name: $sml";
c@50: 	exit 2 ;;
c@50: esac
c@50: