Scala example source code file (tool-unix.tmpl)

This example Scala source code file (tool-unix.tmpl) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

d, java_home, java_opts, override_usejavacp, p, scala_home, scala_runner_debug, sep, tool_classpath, windows_opt

The tool-unix.tmpl Scala example source code

#!/usr/bin/env bash
#
##############################################################################
# Copyright 2002-2013 LAMP/EPFL
#
# This is free software; see the distribution for copying conditions.
# There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.
##############################################################################

findScalaHome () {
  # see SI-2092 and SI-5792
  local source="${BASH_SOURCE[0]}"
  while [ -h "$source" ] ; do
    local linked="$(readlink "$source")"
    local dir="$( cd -P $(dirname "$source") && cd -P $(dirname "$linked") && pwd )"
    source="$dir/$(basename "$linked")"
  done
  ( cd -P "$(dirname "$source")/.." && pwd )
}
execCommand () {
  [[ -n $SCALA_RUNNER_DEBUG ]] && echo "" && for arg in "$@@"; do echo "$arg"; done && echo "";
  "$@@"
}

# Not sure what the right default is here: trying nonzero.
scala_exit_status=127
saved_stty=""

# restore stty settings (echo in particular)
function restoreSttySettings() {
  if [[ -n $SCALA_RUNNER_DEBUG ]]; then
    echo "restoring stty:"
    echo "$saved_stty"
  fi
    
  stty $saved_stty
  saved_stty=""
}

function onExit() {
  [[ "$saved_stty" != "" ]] && restoreSttySettings
  exit $scala_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
if [[ -n $SCALA_RUNNER_DEBUG ]]; then
  echo "saved stty:"
  echo "$saved_stty"
fi

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

unset mingw
if uname | grep -q ^MINGW; then
  mingw="$(uname)"
fi

# Finding the root folder for this Scala distribution
SCALA_HOME="$(findScalaHome)"
SEP=":"

# Possible additional command line options
WINDOWS_OPT=""
EMACS_OPT="-Denv.emacs=$EMACS"

# Remove spaces from SCALA_HOME on windows
if [[ -n "$cygwin" ]]; then
  SCALA_HOME="$(shome="$(cygpath --windows --short-name "$SCALA_HOME")" ; cygpath --unix "$shome")"
# elif uname |grep -q ^MINGW; then
#   SEP=";"
fi

# Constructing the extension classpath
TOOL_CLASSPATH="@classpath@"
if [[ -z "$TOOL_CLASSPATH" ]]; then
    for ext in "$SCALA_HOME"/lib/* ; do
        if [[ -z "$TOOL_CLASSPATH" ]]; then
            TOOL_CLASSPATH="$ext"
        else
            TOOL_CLASSPATH="${TOOL_CLASSPATH}${SEP}${ext}"
        fi
    done
fi

if [[ -n "$cygwin" ]]; then
    if [[ "$OS" = "Windows_NT" ]] && cygpath -m .>/dev/null 2>/dev/null ; then
        format=mixed
    else
        format=windows
    fi
    SCALA_HOME="$(cygpath --$format "$SCALA_HOME")"
    if [[ -n "$JAVA_HOME" ]]; then
        JAVA_HOME="$(cygpath --$format "$JAVA_HOME")"
    fi
    TOOL_CLASSPATH="$(cygpath --path --$format "$TOOL_CLASSPATH")"
elif [[ -n "$mingw" ]]; then
    SCALA_HOME="$(cmd //c echo "$SCALA_HOME")"
    TOOL_CLASSPATH="$(cmd //c echo "$TOOL_CLASSPATH")"
fi

if [[ -n "$cygwin$mingw" ]]; then
    case "$TERM" in
        rxvt* | xterm*)
            stty -icanon min 1 -echo
            WINDOWS_OPT="-Djline.terminal=unix"
        ;;
    esac
fi

[[ -n "$JAVA_OPTS" ]] || JAVA_OPTS="@javaflags@"

# break out -D and -J options and add them to JAVA_OPTS as well
# so they reach the underlying JVM in time to do some good.  The
# -D options will be available as system properties.
declare -a java_args
declare -a scala_args

# default to the boot classpath for speed, except on cygwin/mingw because
# JLine on Windows requires a custom DLL to be loaded.
unset usebootcp
if [[ -z "$cygwin$mingw" ]]; then
  usebootcp="true"
fi

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

# SI-8358, SI-8368 -- the default should really be false,
# but I don't want to flip the default during 2.11's RC cycle
OVERRIDE_USEJAVACP="-Dscala.usejavacp=true"

while [[ $# -gt 0 ]]; do
  case "$1" in
    -D*)
      # pass to scala as well: otherwise we lose it sometimes when we
      # need it, e.g. communicating with a server compiler.
      java_args=("${java_args[@@]}" "$1")
      scala_args=("${scala_args[@@]}" "$1")
      # respect user-supplied -Dscala.usejavacp
      case "$1" in -Dscala.usejavacp*) OVERRIDE_USEJAVACP="";; esac
      shift
      ;;
    -J*)
      # as with -D, pass to scala even though it will almost
      # never be used.
      java_args=("${java_args[@@]}" "${1:2}")
      scala_args=("${scala_args[@@]}" "$1")
      shift
      ;;
    -toolcp)
      TOOL_CLASSPATH="${TOOL_CLASSPATH}${SEP}${2}"
      shift 2
      ;;
    -nobootcp)
      unset usebootcp
      shift
      ;;
    -usebootcp)
      usebootcp="true"
      shift
      ;;
    -debug)
      SCALA_RUNNER_DEBUG=1
      shift
      ;;
    *)
      scala_args=("${scala_args[@@]}" "$1")
      shift
      ;;
  esac
done

# reset "$@@" to the remaining args
set -- "${scala_args[@@]}"

if [[ -z "$JAVACMD" && -n "$JAVA_HOME" && -x "$JAVA_HOME/bin/java" ]]; then
    JAVACMD="$JAVA_HOME/bin/java"
fi

# 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 \
  "${JAVACMD:=java}" \
  $JAVA_OPTS \
  "${java_args[@@]}" \
  $(classpathArgs) \
  -Dscala.home="$SCALA_HOME" \
  $OVERRIDE_USEJAVACP \
  "$EMACS_OPT" \
  $WINDOWS_OPT \
  @properties@ @class@ @toolflags@ "$@@"

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