#!/usr/bin/env bash

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

#
# Shell script for starting the Spark Shell REPL

args="$@"
cygwin=false
case "`uname`" in
    CYGWIN*) cygwin=true;;
esac

# Enter posix mode for bash
set -o posix

if [[ "$@" == *--help* ]]; then
  echo "Usage: ./bin/spark-shell [options]"
  ./bin/spark-submit --help 2>&1 | grep -v Usage 1>&2
  exit 0
fi

## Global script variables
FWDIR="$(cd `dirname $0`/..; pwd)"

function main(){
    if $cygwin; then
        # Workaround for issue involving JLine and Cygwin
        # (see http://sourceforge.net/p/jline/bugs/40/).
        # If you're using the Mintty terminal emulator in Cygwin, may need to set the
        # "Backspace sends ^H" setting in "Keys" section of the Mintty options
        # (see https://github.com/sbt/sbt/issues/562).
        stty -icanon min 1 -echo > /dev/null 2>&1
        export SPARK_REPL_OPTS="$SPARK_REPL_OPTS -Djline.terminal=unix"
        $FWDIR/bin/spark-submit spark-internal "$args" --class org.apache.spark.repl.Main
        stty icanon echo > /dev/null 2>&1
    else
        export SPARK_REPL_OPTS
        $FWDIR/bin/spark-submit spark-internal "$args" --class org.apache.spark.repl.Main
    fi
}

# Copy restore-TTY-on-exit functions from Scala script so spark-shell exits properly even in
# binary distribution of Spark where Scala is not installed
exit_status=127
saved_stty=""

# restore stty settings (echo in particular)
function restoreSttySettings() {
  stty $saved_stty
  saved_stty=""
}

function onExit() {
  if [[ "$saved_stty" != "" ]]; then
    restoreSttySettings
  fi
  exit $exit_status
}

# to reenable echo if we are interrupted before completing.
trap onExit INT

# save terminal settings
saved_stty=$(stty -g 2>/dev/null)
# clear on error so we don't later try to restore them
if [[ ! $? ]]; then
  saved_stty=""
fi

main

# record the exit status lest it be overwritten:
# then reenable echo and propagate the code.
exit_status=$?
onExit