#!/bin/bash
#
# Compiles code with DDC and runs the resulting code in d8 (the v8 command
# line tool).  Only recent versions of v8/d8 that include es6 modules are
# supported.
#
# The first script supplied should be the one with `main()`.
#
# Saves the output in the same directory as the sources for convenient
# inspection, modification or rerunning the code.
#
# TODO(vsm): Investigate what polyfills from dart2js would be useful here:
# sdk/lib/_internal/js_runtime/lib/preambles/d8.js
#
D8=$(type -P d8)
if [ ! $D8 ]; then
  echo "Please add d8 to your PATH"
  exit 1
fi
set -e
DDC_PATH=$( cd $( dirname "${BASH_SOURCE[0]}" )/.. && pwd )
BASENAME=$( basename "${1%.*}")
LIBROOT=$(cd $( dirname "${1%.*}") && pwd)

# D8 uses relative paths.  That won't work for the sdk right now as the
# summary is in a slightly different location.
# D8/ES6 imports also do not add a ".js" extension, so this is "dart_sdk"
# instead of "dart_sdk.js".
if [ ! -f dart_sdk ]; then
    ln -s $DDC_PATH/lib/js/es6/dart_sdk.js dart_sdk
fi

dart -c $DDC_PATH/bin/dartdevc.dart --modules=es6 --library-root=$LIBROOT \
    --dart-sdk-summary=$DDC_PATH/lib/sdk/ddc_sdk.sum \
    -o $LIBROOT/$BASENAME.js $*
pushd $LIBROOT > /dev/null
echo "
    import { dart, _isolate_helper } from 'dart_sdk';
    import { $BASENAME } from '$BASENAME.js';
    let main = $BASENAME.main;
    dart.ignoreWhitelistedErrors(false);
    try {
      _isolate_helper.startRootIsolate(() => {}, []);
      main();
    } catch(e) {
      console.error(e.toString(), dart.stackTrace(e).toString());
    }" \
    > $LIBROOT/$BASENAME.d8.js
$D8 --module $BASENAME.d8.js || exit 1
popd > /dev/null