#!/bin/bash
# This script is used for running compiler standalone(outside of sbt)
# it's based on miniboxing script and paulp's launcher script


# Configuration
SCALA_VERSION=2.11.1
SCALA_BINARY_VERSION=2.11
DOTTY_VERSION=0.1
bootcp=true
default_java_opts="-Xmx768m -Xms768m"
programName=$(basename "$0")
# uncomment next line to enable debug output
#debug=true



declare -a java_args scala_args residual_args
unset verbose quiet cygwin toolcp colors saved_stty


CompilerMain=dotty.tools.dotc.Main


# Try to autodetect real location of the script
DOTTY_ROOT="`readlink \"$0\"`"             #  relative, symbolic links resolved
if [[ "$DOTTY_ROOT" == "" ]]; then
  DOTTY_ROOT="$0"
fi
DOTTY_ROOT="`dirname \"$DOTTY_ROOT\"`"
DOTTY_ROOT="`( cd \"$DOTTY_ROOT\" && pwd )`/.."  # absolute
# autodetecting the compiler jar. this is location where sbt 'packages' it
MAIN_JAR=$DOTTY_ROOT/target/scala-$SCALA_BINARY_VERSION/dotty_$SCALA_BINARY_VERSION-$DOTTY_VERSION-SNAPSHOT.jar

function checkjar {
  if [ ! -f "$1" ]
  then
    echo "The script is going to build the required jar file $1 by running \"sbt $2\""
    cd $DOTTY_ROOT
    sbt $2
    cd -
    if [ ! -f "$1" ]
    then
      echo "The required jar file has not been built by sbt. Please run \"sbt $2\""
      exit 1
    else
      echo "The required jar file was built successfully."
    fi
  fi
}

checkjar $MAIN_JAR package

# Autodetecting the scala-library location, in case it wasn't provided by an environment variable
if [ "$SCALA_LIBRARY_JAR" == "" ]
then  
  SCALA_LIBRARY_JAR=$HOME/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-$SCALA_VERSION.jar
  # this is location where sbt stores it in ivy cache
fi
# save as for scala-library now for scala-reflect
if [ "$SCALA_REFLECT_JAR" == "" ]
then  
  SCALA_REFLECT_JAR=$HOME/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-$SCALA_VERSION.jar
fi

if [ ! -f "$SCALA_LIBRARY_JAR" -o ! -f "$SCALA_REFLECT_JAR" ]
then
  echo To use this script please set 
  echo SCALA_LIBRARY_JAR to point to scala-library-$SCALA_VERSION.jar "(currently $SCALA_LIBRARY_JAR)"
  echo SCALA_REFLECT_JAR to point to scala-reflect-$SCALA_VERSION.jar "(currently $SCALA_REFLECT_JAR)"
fi

ifdebug () {
  [[ -n $debug ]] && eval "$@"
}
echoErr () {
  echo >&2 "$@"
}
dlog () {
  [[ -n $debug ]] && echoErr "$@"
}

die() {
  echo "Aborting: $@"
  exit 1
}
echoArgs () {
  echoErr ""
  for arg; do
echoErr "$arg"
  done
echoErr ""
}
execCommand () {
  ifdebug echoArgs "$@"
  ignore="$(cat "$HOME/.scala_ignore_crashes" 2>/dev/null)"
  if [[ $ignore == "true" ]]; then
    "$@" 2>&1 | scala-crash-filter
  else
    $@
  fi
}

# restore stty settings (echo in particular)
restoreSttySettings () {
  dlog "" && dlog "[restore stty] $saved_stty"
  stty $saved_stty && saved_stty=""
}

onExit () {
  [[ -n $saved_stty ]] && restoreSttySettings
  exit $scala_exit_status
}

# Get debug set early
for arg in "$@"; do
  [[ $arg == "-d" ]] && debug=true
done

# 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
[[ $? ]] || saved_stty=""
dlog "[save stty] $saved_stty"

if uname | grep -q ^CYGWIN; then
cygwin="$(uname)"
fi

addJava () {
  dlog "[addJava] arg = '$1'"
  java_args=( "${java_args[@]}" "$1" )
}
addScala () {
  dlog "[addScala] arg = '$1'"
  scala_args=( "${scala_args[@]}" "$1" )
}
addResidual () {
  dlog "[residual] arg = '$1'"
  residual_args=( "${residual_args[@]}" "$1" )
}

onExit() {
  [[ -n $saved_stty ]] && restoreSttySettings
  exit $scala_exit_status
}

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

# If using the boot classpath, also pass an empty classpath
# to java to suppress "." from materializing.
classpathArgs () {
  if [[ -n $bootcp ]]; then
echo "-Xbootclasspath/a:$SCALA_LIBRARY_JAR:$SCALA_REFLECT_JAR:$MAIN_JAR -classpath $MAIN_JAR"
  else
echo "-classpath $SCALA_LIBRARY_JAR:$SCALA_REFLECT_JAR:$MAIN_JAR"
  fi
}

# e.g. path -java-home /path/to/java_home
require_arg () {
  local type="$1"
  local opt="$2"
  local arg="$3"

  if [[ -z "$arg" ]] || [[ "${arg:0:1}" == "-" ]]; then
    die "$opt requires <$type> argument"
  fi
}





while [[ $# -gt 0 ]]; do
case "$1" in
           --) shift; for arg; do addResidual "$arg"; done; set -- ;;
     -h|-help) usage; exit 1 ;;
  -v|-verbose) verbose=true && shift ;;
    -d|-debug) debug=true && shift ;;
    -q|-quiet) quiet=true && shift ;;

        -repl) main_class=$ReplMain && shift ;;
     -compile) main_class=$CompilerMain && shift ;;
         -run) main_class=$ReplMain && shift ;;
         -fsc) main_class=$FscMain && shift ;;
      -bootcp) bootcp=true && shift ;;
   -no-bootcp) unset bootcp && shift ;;
      -colors) colors=true && shift ;;
   -no-colors) unset colors && shift ;;
      -jrebel) jrebel=true && shift ;;
   -no-jrebel) unset jrebel && shift ;;

      -toolcp) require_arg classpath "$1" "$2" && toolcp="$2" && shift 2 ;;
   -java-home) require_arg path "$1" "$2" && java_cmd="$2/bin/java" && shift 2 ;;

          # break out -D and -J options and add them to JAVA_OPTS as well
          # so they reach the JVM in time to do some good. The -D options
          # will be available as system properties.
          -D*) addJava "$1" && addScala "$1" && shift ;;
          -J*) addJava "${1:2}" && addScala "$1" && shift ;;
            *) addResidual "$1" && shift ;;
  esac
done


[[ -z $java_cmd ]] && prefix=${java_home:+$java_home/bin/} && java_cmd="${prefix}java"

# note that variables which may intentionally be empty must not
# be quoted: otherwise an empty string will appear as a command line
# argument, and java will think that is the program to run.
execCommand \
  "$java_cmd" \
  ${JAVA_OPTS:-$default_java_opts} \
  "${java_args[@]}" \
  "$(classpathArgs)" \
  -Dscala.usejavacp=true \
  "${CompilerMain}" \
  "${scala_args[@]}" \
  "${residual_args[@]}"

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


#echo java -cp $MAIN_JAR: -Dscala.usejavacp=true dotty.tools.dotc.Main $@