Chris@0: #!/bin/bash
Chris@0: 
Chris@0: # Disable shellcheck warnings for useless-use-of-cat. UUOC is good
Chris@0: # practice, not bad: clearer, safer, less error-prone.
Chris@0: # shellcheck disable=SC2002
Chris@0: 
Chris@0: sml="$REPOINT_SML"
Chris@0: 
Chris@0: set -eu
Chris@0: 
Chris@0: # avoid gussying up output
Chris@0: export HGPLAIN=true
Chris@0: 
Chris@0: mydir=$(dirname "$0")
Chris@0: program="$mydir/repoint.sml"
Chris@0: 
Chris@0: hasher=
Chris@0: local_install=
Chris@0: if [ -w "$mydir" ]; then
Chris@0:     if echo | sha256sum >/dev/null 2>&1 ; then
Chris@0: 	hasher=sha256sum
Chris@0:         local_install=true
Chris@0:     elif echo | shasum >/dev/null 2>&1 ; then
Chris@0: 	hasher=shasum
Chris@0: 	local_install=true
Chris@0:     else
Chris@0:         echo "WARNING: sha256sum or shasum program not found" 1>&2
Chris@0:     fi
Chris@0: fi
Chris@0: 
Chris@0: if [ -n "$local_install" ]; then
Chris@0:     hash=$(echo "$sml" | cat "$program" - | $hasher | cut -c1-16)
Chris@0:     gen_sml=$mydir/.repoint-$hash.sml
Chris@0:     gen_out=$mydir/.repoint-$hash.bin
Chris@0:     trap 'rm -f $gen_sml' 0
Chris@0: else
Chris@0:     gen_sml=$(mktemp /tmp/repoint-XXXXXXXX.sml)
Chris@0:     gen_out=$(mktemp /tmp/repoint-XXXXXXXX.bin)
Chris@0:     trap 'rm -f $gen_sml $gen_out' 0
Chris@0: fi
Chris@0: 
Chris@0: if [ -x "$gen_out" ]; then
Chris@0:     exec "$gen_out" "$@"
Chris@0: fi
Chris@0: 
Chris@0: # We need one of Poly/ML, SML/NJ, MLton, or MLKit. Since we're running
Chris@0: # a single-file SML program as if it were a script, our order of
Chris@0: # preference is usually based on startup speed. An exception is the
Chris@0: # local_install case, where we retain a persistent binary
Chris@0: 
Chris@0: if [ -z "$sml" ]; then
Chris@0:     if [ -n "$local_install" ] && mlton 2>&1 | grep -q 'MLton'; then
Chris@0: 	sml="mlton"
Chris@0:     elif sml -h 2>&1 | grep -q 'Standard ML of New Jersey'; then
Chris@0: 	sml="smlnj"
Chris@0:     # We would prefer Poly/ML to SML/NJ, except that Poly v5.7 has a
Chris@0:     # nasty bug that occasionally causes it to deadlock on startup.
Chris@0:     # That is fixed in v5.7.1, so we could promote it up the order
Chris@0:     # again at some point in future
Chris@0:     elif echo | poly -v 2>/dev/null | grep -q 'Poly/ML'; then
Chris@0: 	sml="polyml"
Chris@0:     elif mlton 2>&1 | grep -q 'MLton'; then
Chris@0: 	sml="mlton"
Chris@0:     # MLKit is at the bottom because it leaves compiled files around
Chris@0:     # in an MLB subdir in the current directory
Chris@0:     elif mlkit 2>&1 | grep -q 'MLKit'; then
Chris@0: 	sml="mlkit"
Chris@0:     else cat 1>&2 <<EOF
Chris@0: 
Chris@0: ERROR: No supported SML compiler or interpreter found       
Chris@0: EOF
Chris@0: 	cat 1>&2 <<EOF
Chris@0: 
Chris@0:   The Repoint external source code manager needs a Standard ML (SML)
Chris@0:   compiler or interpreter to run.
Chris@0: 
Chris@0:   Please ensure you have one of the following SML implementations
Chris@0:   installed and present in your PATH, and try again.
Chris@0: 
Chris@0:     1. Standard ML of New Jersey
Chris@0:        - may be found in a distribution package called: smlnj
Chris@0:        - executable name: sml
Chris@0: 
Chris@0:     2. Poly/ML
Chris@0:        - may be found in a distribution package called: polyml
Chris@0:        - executable name: poly
Chris@0: 
Chris@0:     3. MLton
Chris@0:        - may be found in a distribution package called: mlton
Chris@0:        - executable name: mlton
Chris@0: 
Chris@0:     4. MLKit
Chris@0:        - may be found in a distribution package called: mlkit
Chris@0:        - executable name: mlkit
Chris@0: 
Chris@0: EOF
Chris@0: 	exit 2
Chris@0:     fi
Chris@0: fi
Chris@0: 
Chris@0: arglist=""
Chris@0: for arg in "$@"; do
Chris@0:     if [ -n "$arglist" ]; then arglist="$arglist,"; fi
Chris@0:     if echo "$arg" | grep -q '["'"'"']' ; then
Chris@0: 	arglist="$arglist\"usage\""
Chris@0:     else
Chris@0: 	arglist="$arglist\"$arg\""
Chris@0:     fi
Chris@0: done
Chris@0: 
Chris@0: case "$sml" in
Chris@0:     polyml)
Chris@0:         if [ -n "$local_install" ] && polyc --help >/dev/null 2>&1 ; then
Chris@0:             if [ ! -x "$gen_out" ]; then
Chris@0:                 polyc -o "$gen_out" "$program"
Chris@0:             fi
Chris@0: 	    "$gen_out" "$@"
Chris@0:         else
Chris@0:             echo 'use "'"$program"'"; repoint ['"$arglist"'];' |
Chris@0:                 poly -q --error-exit
Chris@0:         fi ;;
Chris@0:     mlton)
Chris@0:         if [ ! -x "$gen_out" ]; then
Chris@0: 	    echo "[Precompiling Repoint binary...]" 1>&2
Chris@0: 	    echo "val _ = main ()" | cat "$program" - > "$gen_sml"
Chris@0: 	    mlton -output "$gen_out" "$gen_sml"
Chris@0:         fi
Chris@0: 	"$gen_out" "$@" ;;
Chris@0:     mlkit)
Chris@0:         if [ ! -x "$gen_out" ]; then
Chris@0: 	    echo "[Precompiling Repoint binary...]" 1>&2
Chris@0: 	    echo "val _ = main ()" | cat "$program" - > "$gen_sml"
Chris@0: 	    mlkit -output "$gen_out" "$gen_sml"
Chris@0:         fi
Chris@0: 	"$gen_out" "$@" ;;
Chris@0:     smlnj)
Chris@0: 	cat "$program" | (
Chris@0: 	    cat <<EOF
Chris@0: val smlrun__cp = 
Chris@0:     let val x = !Control.Print.out in
Chris@0:         Control.Print.out := { say = fn _ => (), flush = fn () => () };
Chris@0:         x
Chris@0:     end;
Chris@0: val smlrun__prev = ref "";
Chris@0: Control.Print.out := { 
Chris@0:     say = fn s => 
Chris@0:         (if String.isSubstring " Error" s
Chris@0:          then (Control.Print.out := smlrun__cp;
Chris@0:                (#say smlrun__cp) (!smlrun__prev);
Chris@0:                (#say smlrun__cp) s)
Chris@0:          else (smlrun__prev := s; ())),
Chris@0:     flush = fn s => ()
Chris@0: };
Chris@0: EOF
Chris@0: 	    cat -
Chris@0: 	    cat <<EOF
Chris@0: val _ = repoint [$arglist];
Chris@0: val _ = OS.Process.exit (OS.Process.success);
Chris@0: EOF
Chris@0:             ) > "$gen_sml"
Chris@0: 	CM_VERBOSE=false sml "$gen_sml" ;;
Chris@0:     *)
Chris@0: 	echo "ERROR: Unknown SML implementation name: $sml" 1>&2;
Chris@0: 	exit 2 ;;
Chris@0: esac
Chris@0: