#!/bin/bash
# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

export FLUTTER_ROOT=$(dirname $(dirname "${BASH_SOURCE[0]}"))
FLUTTER_TOOLS_DIR="$FLUTTER_ROOT/packages/flutter_tools"
SNAPSHOT_PATH="$FLUTTER_ROOT/bin/cache/flutter_tools.snapshot"
STAMP_PATH="$FLUTTER_ROOT/bin/cache/flutter_tools.stamp"
SCRIPT_PATH="$FLUTTER_TOOLS_DIR/bin/flutter_tools.dart"

# TODO(abarth): We shouldn't require dart to be on the user's path.
DART=dart

REVISION=`(cd "$FLUTTER_ROOT"; git rev-parse HEAD)`
if [ ! -f "$SNAPSHOT_PATH" ] || [ ! -f "$STAMP_PATH" ] || [ `cat "$STAMP_PATH"` != "$REVISION" ] || [ "$FLUTTER_TOOLS_DIR/pubspec.yaml" -nt "$FLUTTER_TOOLS_DIR/pubspec.lock" ]; then
  echo Updating flutter tool...
  (cd "$FLUTTER_TOOLS_DIR"; pub get)
  $DART --snapshot="$SNAPSHOT_PATH" --package-root="$FLUTTER_TOOLS_DIR/packages" "$SCRIPT_PATH"
  echo -n $REVISION > "$STAMP_PATH"
fi

$DART "$SNAPSHOT_PATH" "$@"

# The VM exits with code 253 if the snapshot version is out-of-date.
# If it is, we need to snapshot it again.
EXIT_CODE=$?
if [ $EXIT_CODE != 253 ]; then
  exit $EXIT_CODE
fi

$DART --snapshot="$SNAPSHOT_PATH" --package-root="$FLUTTER_TOOLS_DIR/packages" "$SCRIPT_PATH"
$DART "$SNAPSHOT_PATH" "$@"
