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#!/usr/bin/env bash
# A more capable sbt runner, coincidentally also called sbt.
# Author: Paul Phillips <paulp@typesafe.com>
# todo - make this dynamic
declare -r sbt_release_version="0.13.1"
declare -r sbt_unreleased_version="0.13.2-SNAPSHOT" # -sbt-dev doesn't work at present
declare -r buildProps="project/build.properties"
declare sbt_jar sbt_dir sbt_create sbt_launch_dir
declare scala_version java_home sbt_explicit_version
declare verbose debug quiet noshare batch trace_level log_level
declare sbt_saved_stty
echoerr () { [[ -z "$quiet" ]]           && echo    "$@" >&2; }
vlog ()    { [[ -n "$verbose$debug" ]] && echoerr "$@"; }
dlog ()    { [[ -n "$debug" ]]           && echoerr "$@"; }
# we'd like these set before we get around to properly processing arguments
for arg in "$@"; do
  case "$arg" in
    -q|-quiet)    quiet=true ;;
    -d|-debug)    debug=true ;;
  -v|-verbose)  verbose=true ;;
# spaces are possible, e.g. sbt.version = 0.13.0
build_props_sbt () {
  [[ -r "$buildProps" ]] && \
    grep '^sbt\.version' "$buildProps" | tr '=' ' ' | awk '{ print $2; }'
update_build_props_sbt () {
  local ver="$1"
  local old="$(build_props_sbt)"
  [[ -r "$buildProps" ]] && [[ "$ver" != "$old" ]] && {
    perl -pi -e "s/^sbt\.version\b.*\$/sbt.version=${ver}/" "$buildProps"
    grep -q '^sbt.version[ =]' "$buildProps" || printf "\nsbt.version=%s\n" "$ver" >> "$buildProps"
    echoerr "!!!"
    echoerr "!!! Updated file $buildProps setting sbt.version to: $ver"
    echoerr "!!! Previous value was: $old"
    echoerr "!!!"
sbt_version () {
  if [[ -n "$sbt_explicit_version" ]]; then
    echo "$sbt_explicit_version"
    local v="$(build_props_sbt)"
    if [[ -n "$v" ]]; then
      echo "$v"
      echo "$sbt_release_version"
# restore stty settings (echo in particular)
onSbtRunnerExit() {
  [[ -n "$sbt_saved_stty" ]] || return
  dlog "restoring stty: $sbt_saved_stty"
  stty "$sbt_saved_stty"
  unset sbt_saved_stty
# save stty and trap exit, to ensure echo is reenabled if we are interrupted.
trap onSbtRunnerExit EXIT
sbt_saved_stty="$(stty -g 2>/dev/null)"
dlog "Saved stty: $sbt_saved_stty"
# this seems to cover the bases on OSX, and someone will
# have to tell me about the others.
get_script_path () {
  local path="$1"
  [[ -L "$path" ]] || { echo "$path" ; return; }
  local target="$(readlink "$path")"
  if [[ "${target:0:1}" == "/" ]]; then
    echo "$target"
    echo "${path%/*}/$target"
  echo "Aborting: $@"
make_url () {
  version="$1"
  case "$version" in
        0.7.*) echo "http://simple-build-tool.googlecode.com/files/sbt-launch-0.7.7.jar" ;;
      0.10.* ) echo "$sbt_launch_repo/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
    0.11.[12]) echo "$sbt_launch_repo/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
            *) echo "$sbt_launch_repo/org.scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
init_default_option_file () {
  local overriding_var="${!1}"
  local default_file="$2"
  if [[ ! -r "$default_file" && "$overriding_var" =~ ^@(.*)$ ]]; then
    local envvar_file="${BASH_REMATCH[1]}"
    if [[ -r "$envvar_file" ]]; then
      default_file="$envvar_file"
  echo "$default_file"
declare -r cms_opts="-XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC"
declare -r jit_opts="-XX:ReservedCodeCacheSize=256m -XX:+TieredCompilation"
declare -r default_jvm_opts="-ea -Dfile.encoding=UTF8 -XX:MaxPermSize=384m -Xms512m -Xmx1536m -Xss2m $jit_opts $cms_opts"
declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
declare -r latest_28="2.8.2"
declare -r latest_29="2.9.3"
declare -r latest_210="2.10.3"
declare -r latest_211="2.11.0-M5"
declare -r script_path="$(get_script_path "$BASH_SOURCE")"
declare -r script_name="${script_path##*/}"
# some non-read-onlies set with defaults
declare java_cmd="java"
declare sbt_opts_file="$(init_default_option_file SBT_OPTS .sbtopts)"
declare jvm_opts_file="$(init_default_option_file JVM_OPTS .jvmopts)"
declare sbt_launch_repo="http://typesafe.artifactoryonline.com/typesafe/ivy-releases"
# pull -J and -D options to give to java.
declare -a residual_args
declare -a java_args
declare -a scalac_args
declare -a sbt_commands
# args to jvm/sbt via files or environment variables
declare -a extra_jvm_opts extra_sbt_opts
# if set, use JAVA_HOME over java found in path
[[ -e "$JAVA_HOME/bin/java" ]] && java_cmd="$JAVA_HOME/bin/java"
# directory to store sbt launchers
declare sbt_launch_dir="$HOME/.sbt/launchers"
[[ -d "$sbt_launch_dir" ]] || mkdir -p "$sbt_launch_dir"
[[ -w "$sbt_launch_dir" ]] || sbt_launch_dir="$(mktemp -d -t sbt_extras_launchers.XXXXXX)"
build_props_scala () {
  if [[ -r "$buildProps" ]]; then
    versionLine="$(grep '^build.scala.versions' "$buildProps")"
    versionString="${versionLine##build.scala.versions=}"
    echo "${versionString%% .*}"
execRunner () {
  # print the arguments one to a line, quoting any containing spaces
  [[ "$verbose" || "$debug" ]] && echo "# Executing command line:" && {
    for arg; do
      if [[ -n "$arg" ]]; then
        if printf "%s\n" "$arg" | grep -q ' '; then
          printf "\"%s\"\n" "$arg"
        else
          printf "%s\n" "$arg"
    echo ""
  if [[ -n "$batch" ]]; then
    exec </dev/null
  exec "$@"
jar_url () {
  make_url "$1"
jar_file () {
  echo "$sbt_launch_dir/$1/sbt-launch.jar"
download_url () {
  local url="$1"
  local jar="$2"
  echo "Downloading sbt launcher for $(sbt_version):"
  echo "  From  $url"
  echo "    To  $jar"
  mkdir -p "${jar%/*}" && {
    if which curl >/dev/null; then
      curl --fail --silent "$url" --output "$jar"
    elif which wget >/dev/null; then
      wget --quiet -O "$jar" "$url"
  } && [[ -r "$jar" ]]
acquire_sbt_jar () {
  for_sbt_version="$(sbt_version)"
  sbt_url="$(jar_url "$for_sbt_version")"
  sbt_jar="$(jar_file "$for_sbt_version")"
  [[ -r "$sbt_jar" ]] || download_url "$sbt_url" "$sbt_jar"
  cat <<EOM
Usage: $script_name [options]
  -h | -help         print this message
  -v | -verbose      this runner is chattier
  -d | -debug        set sbt log level to Debug
  -q | -quiet        set sbt log level to Error
  -trace <level>     display stack traces with a max of <level> frames (default: -1, traces suppressed)
  -no-colors         disable ANSI color codes
  -sbt-create        start sbt even if current directory contains no sbt project
  -sbt-dir   <path>  path to global settings/plugins directory (default: ~/.sbt/<version>)
  -sbt-boot  <path>  path to shared boot directory (default: ~/.sbt/boot in 0.11+)
  -ivy       <path>  path to local Ivy repository (default: ~/.ivy2)
  -no-share          use all local caches; no sharing
  -offline           put sbt in offline mode
  -jvm-debug <port>  Turn on JVM debugging, open at the given port.
  -batch             Disable interactive mode
  -prompt <expr>     Set the sbt prompt; in expr, 's' is the State and 'e' is Extracted
  # sbt version (default: from $buildProps if present, else latest release)
  !!! The only way to accomplish this pre-0.12.0 if there is a build.properties file which
  !!! contains an sbt.version property is to update the file on disk.  That's what this does.
  -sbt-version  <version>   use the specified version of sbt (default: $sbt_release_version)
  -sbt-jar      <path>      use the specified jar as the sbt launcher
  -sbt-launch-dir <path>    directory to hold sbt launchers (default: $sbt_launch_dir)
  -sbt-launch-repo <url>    repo url for downloading sbt launcher jar (default: $sbt_launch_repo)
  # scala version (default: as chosen by sbt)
  -28                       use $latest_28
  -29                       use $latest_29
  -210                      use $latest_210
  -211                      use $latest_211
  -scala-home <path>        use the scala build at the specified directory
  -scala-version <version>  use the specified version of scala
  -binary-version <version> use the specified scala version when searching for dependencies
  # java version (default: java from PATH, currently $(java -version 2>&1 | grep version))
  -java-home <path>         alternate JAVA_HOME
  # passing options to the jvm - note it does NOT use JAVA_OPTS due to pollution
  # The default set is used if JVM_OPTS is unset and no -jvm-opts file is found
  <default>        $default_jvm_opts
  JVM_OPTS         environment variable holding either the jvm args directly, or
                   the reference to a file containing jvm args if given path is prepended by '@' (e.g. '@/etc/jvmopts')
                   Note: "@"-file is overridden by local '.jvmopts' or '-jvm-opts' argument.
  -jvm-opts <path> file containing jvm args (if not given, .jvmopts in project root is used if present)
  -Dkey=val        pass -Dkey=val directly to the jvm
  -J-X             pass option -X directly to the jvm (-J is stripped)
  # passing options to sbt, OR to this runner
  SBT_OPTS         environment variable holding either the sbt args directly, or
                   the reference to a file containing sbt args if given path is prepended by '@' (e.g. '@/etc/sbtopts')
                   Note: "@"-file is overridden by local '.sbtopts' or '-sbt-opts' argument.
  -sbt-opts <path> file containing sbt args (if not given, .sbtopts in project root is used if present)
  -S-X             add -X to sbt's scalacOptions (-S is stripped)
addJava () {
  dlog "[addJava] arg = '$1'"
  java_args=( "${java_args[@]}" "$1" )
addSbt () {
  dlog "[addSbt] arg = '$1'"
  sbt_commands=( "${sbt_commands[@]}" "$1" )
addScalac () {
  dlog "[addScalac] arg = '$1'"
  scalac_args=( "${scalac_args[@]}" "$1" )
addResidual () {
  dlog "[residual] arg = '$1'"
  residual_args=( "${residual_args[@]}" "$1" )
addResolver () {
  addSbt "set resolvers += $1"
addDebugger () {
  addJava "-Xdebug"
  addJava "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"
setScalaVersion () {
  [[ "$1" == *"-SNAPSHOT" ]] && addResolver 'Resolver.sonatypeRepo("snapshots")'
  addSbt "++ $1"
process_args ()
  require_arg () {
    local type="$1"
    local opt="$2"
    local arg="$3"
    if [[ -z "$arg" ]] || [[ "${arg:0:1}" == "-" ]]; then
      die "$opt requires <$type> argument"
  while [[ $# -gt 0 ]]; do
    case "$1" in
       -h|-help) usage; exit 1 ;;
    -v|-verbose) verbose=true && log_level=Info && shift ;;
      -d|-debug) debug=true && log_level=Debug && shift ;;
      -q|-quiet) quiet=true && log_level=Error && shift ;;
         -trace) require_arg integer "$1" "$2" && trace_level="$2" && shift 2 ;;
           -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
     -no-colors) addJava "-Dsbt.log.noformat=true" && shift ;;
      -no-share) noshare=true && shift ;;
      -sbt-boot) require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
       -sbt-dir) require_arg path "$1" "$2" && sbt_dir="$2" && shift 2 ;;
     -debug-inc) addJava "-Dxsbt.inc.debug=true" && shift ;;
       -offline) addSbt "set offline := true" && shift ;;
     -jvm-debug) require_arg port "$1" "$2" && addDebugger "$2" && shift 2 ;;
         -batch) batch=true && shift ;;
        -prompt) require_arg "expr" "$1" "$2" && addSbt "set shellPrompt in ThisBuild := (s => { val e = Project.extract(s) ; $2 })" && shift 2 ;;
    -sbt-create) sbt_create=true && shift ;;
       -sbt-jar) require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
   -sbt-version) require_arg version "$1" "$2" && sbt_explicit_version="$2" && shift 2 ;;
       -sbt-dev) sbt_explicit_version="$sbt_unreleased_version" && shift ;;
-sbt-launch-dir) require_arg path "$1" "$2" && sbt_launch_dir="$2" && shift 2 ;;
-sbt-launch-repo) require_arg path "$1" "$2" && sbt_launch_repo="$2" && shift 2 ;;
 -scala-version) require_arg version "$1" "$2" && setScalaVersion "$2" && shift 2 ;;
-binary-version) require_arg version "$1" "$2" && addSbt "set scalaBinaryVersion in ThisBuild := \"$2\"" && shift 2 ;;
    -scala-home) require_arg path "$1" "$2" && addSbt "set every scalaHome := Some(file(\"$2\"))" && shift 2 ;;
     -java-home) require_arg path "$1" "$2" && java_cmd="$2/bin/java" && shift 2 ;;
      -sbt-opts) require_arg path "$1" "$2" && sbt_opts_file="$2" && shift 2 ;;
      -jvm-opts) require_arg path "$1" "$2" && jvm_opts_file="$2" && shift 2 ;;
            -D*) addJava "$1" && shift ;;
            -J*) addJava "${1:2}" && shift ;;
            -S*) addScalac "${1:2}" && shift ;;
            -28) setScalaVersion "$latest_28" && shift ;;
            -29) setScalaVersion "$latest_29" && shift ;;
           -210) setScalaVersion "$latest_210" && shift ;;
           -211) setScalaVersion "$latest_211" && shift ;;
              *) addResidual "$1" && shift ;;
# process the direct command line arguments
process_args "$@"
# skip #-styled comments and blank lines
readConfigFile() {
  while read line; do
    [[ $line =~ ^# ]] || [[ -z $line ]] || echo "$line"
  done < "$1"
# if there are file/environment sbt_opts, process again so we
# can supply args to this runner
if [[ -r "$sbt_opts_file" ]]; then
  vlog "Using sbt options defined in file $sbt_opts_file"
  while read opt; do extra_sbt_opts+=("$opt"); done < <(readConfigFile "$sbt_opts_file")
elif [[ -n "$SBT_OPTS" && ! ("$SBT_OPTS" =~ ^@.*) ]]; then
  vlog "Using sbt options defined in variable \$SBT_OPTS"
  extra_sbt_opts=( $SBT_OPTS )
  vlog "No extra sbt options have been defined"
[[ -n "$extra_sbt_opts" ]] && process_args "${extra_sbt_opts[@]}"
# reset "$@" to the residual args
set -- "${residual_args[@]}"
argumentCount=$#
# only exists in 0.12+
setTraceLevel() {
  case "$(sbt_version)" in
    "0.7."* | "0.10."* | "0.11."* )
      echoerr "Cannot set trace level in sbt version $(sbt_version)"
      addSbt "set every traceLevel := $trace_level"
# set scalacOptions if we were given any -S opts
[[ ${#scalac_args[@]} -eq 0 ]] || addSbt "set scalacOptions in ThisBuild += \"${scalac_args[@]}\""
# Update build.properties on disk to set explicit version - sbt gives us no choice
[[ -n "$sbt_explicit_version" ]] && update_build_props_sbt "$sbt_explicit_version"
vlog "Detected sbt version $(sbt_version)"
[[ -n "$scala_version" ]] && echoerr "Overriding scala version to $scala_version"
# no args - alert them there's stuff in here
(( argumentCount > 0 )) || {
  vlog "Starting $script_name: invoke with -help for other options"
  residual_args=( shell )
# verify this is an sbt dir or -create was given
[[ -r ./build.sbt || -d ./project || -n "$sbt_create" ]] || {
  cat <<EOM
$(pwd) doesn't appear to be an sbt project.
If you want to start sbt anyway, run:
  $0 -sbt-create
# pick up completion if present; todo
[[ -r .sbt_completion.sh ]] && source .sbt_completion.sh
# no jar? download it.
[[ -r "$sbt_jar" ]] || acquire_sbt_jar || {
  # still no jar? uh-oh.
  echo "Download failed. Obtain the jar manually and place it at $sbt_jar"
if [[ -n "$noshare" ]]; then
  for opt in ${noshare_opts}; do
    addJava "$opt"
  case "$(sbt_version)" in
    "0.7."* | "0.10."* | "0.11."* | "0.12."* )
      [[ -n "$sbt_dir" ]] || {
        sbt_dir="$HOME/.sbt/$(sbt_version)"
        vlog "Using $sbt_dir as sbt dir, -sbt-dir to override."
  if [[ -n "$sbt_dir" ]]; then
    addJava "-Dsbt.global.base=$sbt_dir"
if [[ -r "$jvm_opts_file" ]]; then
  vlog "Using jvm options defined in file $jvm_opts_file"
  while read opt; do extra_jvm_opts+=("$opt"); done < <(readConfigFile "$jvm_opts_file")
elif [[ -n "$JVM_OPTS" && ! ("$JVM_OPTS" =~ ^@.*) ]]; then
  vlog "Using jvm options defined in \$JVM_OPTS variable"
  extra_jvm_opts=( $JVM_OPTS )
  vlog "Using default jvm options"
  extra_jvm_opts=( $default_jvm_opts )
# traceLevel is 0.12+
[[ -n "$trace_level" ]] && setTraceLevel
if [[ -n "$log_level" ]] && [[ "$log_level" != Info ]]; then
  sbt_commands=("set logLevel in Global := Level.$log_level" "${sbt_commands[@]}")
execRunner "$java_cmd" \
  "${extra_jvm_opts[@]}" \
  "${java_args[@]}" \
  -jar "$sbt_jar" \
  "${sbt_commands[@]}" \
  "${residual_args[@]}"
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