shell helper for run react-native app

run_app.sh

#!/usr/bin/env sh

usage() {
  echo "Usage:"
  echo " run_app android"
  echo " run_app ios"
}

arg=$1
if [ -z "$arg" ]; then
  arg="android"
fi

emulator=$(ps aux | grep "emulator" | wc -l)
#echo $emulator

if [ $arg == "android" ]; then
  if [ $emulator == "1" ]; then
    echo "starting emulator..."
    nohup ~/Developments/android-sdk-macosx/tools/emulator @Nexus_4_API_23 &
  else
    echo "emulator has already run"
  fi
  react-native run-android
elif [ $arg == "ios" ]; then
  react-native run-ios
else
  usage
fi