#!/usr/bin/env bash
INTERMEDIATE=intermediate.wat

read -r -d '' PREAMBLE <<'EOF'
(module $main
EOF

read -r -d '' EPILOGUE <<'EOF'
(memory $memory (export "memory") 10)
)
EOF

# remove file when done
trap "err=$?; rm $INTERMEDIATE; exit $err" EXIT

# load all sources
find ./src | grep -e '\.wat$' | xargs cat > $INTERMEDIATE

# Separate out imports (must be defined first)
IMPORT_REGEX='^\(import .*$'
IMPORTS="$(cat $INTERMEDIATE | grep -E "$IMPORT_REGEX")"
NONIMPORTS="$(cat $INTERMEDIATE | grep -vE "$IMPORT_REGEX")"

# generate file
echo "$PREAMBLE" >  $INTERMEDIATE
echo "" >> $INTERMEDIATE
echo "$IMPORTS" >> $INTERMEDIATE
echo "" >> $INTERMEDIATE
echo "$NONIMPORTS" >> $INTERMEDIATE
echo "$EPILOGUE" >> $INTERMEDIATE

# test file
wat2wasm $INTERMEDIATE
result=$?
mv intermediate.wasm output.wasm

if [ 0 -ne $result ]; then
  echo "Build failed"
  # cat $INTERMEDIATE
  exit $?
else
  echo "Build succeeded, running:"
  wasmtime ./output.wasm --wasi-modules wasi-common --tcplisten 127.0.0.1:8080
fi