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+#!/usr/bin/env bash
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+#
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+
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+# A library to simplify using the SBT launcher from other packages.
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+# Note: This should be used by tools like giter8/conscript etc.
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+
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+# TODO - Should we merge the main SBT script with this library?
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+
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+if test -z "$HOME"; then
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+ declare -r script_dir="$(dirname $script_path)"
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+else
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+ declare -r script_dir="$HOME/.sbt"
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+fi
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+
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+declare -a residual_args
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+declare -a java_args
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+declare -a scalac_args
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+declare -a sbt_commands
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+declare java_cmd=java
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+
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+echoerr () {
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+ echo 1>&2 "$@"
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+}
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+vlog () {
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+ [[ $verbose || $debug ]] && echoerr "$@"
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+}
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+dlog () {
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+ [[ $debug ]] && echoerr "$@"
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+}
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+
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+jar_file () {
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+ echo "$(dirname $(realpath $0))/sbt-launch.jar"
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+}
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+
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+acquire_sbt_jar () {
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+ sbt_jar="$(jar_file)"
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+
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+ if [[ ! -f "$sbt_jar" ]]; then
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+ echoerr "Could not find launcher jar: $sbt_jar"
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+ exit 2
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+ fi
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+}
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+
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+execRunner () {
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+ # print the arguments one to a line, quoting any containing spaces
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+ [[ $verbose || $debug ]] && echo "# Executing command line:" && {
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+ for arg; do
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+ if printf "%s\n" "$arg" | grep -q ' '; then
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+ printf "\"%s\"\n" "$arg"
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+ else
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+ printf "%s\n" "$arg"
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+ fi
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+ done
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+ echo ""
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+ }
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+
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+ exec "$@"
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+}
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+
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+addJava () {
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+ dlog "[addJava] arg = '$1'"
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+ java_args=( "${java_args[@]}" "$1" )
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+}
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+addSbt () {
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+ dlog "[addSbt] arg = '$1'"
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+ sbt_commands=( "${sbt_commands[@]}" "$1" )
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+}
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+addResidual () {
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+ dlog "[residual] arg = '$1'"
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+ residual_args=( "${residual_args[@]}" "$1" )
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+}
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+addDebugger () {
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+ addJava "-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"
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+}
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+
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+# a ham-fisted attempt to move some memory settings in concert
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+# so they need not be dicked around with individually.
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+get_mem_opts () {
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+ local mem=${1:-1536}
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+ local perm=$(( $mem / 4 ))
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+ (( $perm > 256 )) || perm=256
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+ (( $perm < 1024 )) || perm=1024
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+ local codecache=$(( $perm / 2 ))
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+
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+ echo "-Xms${mem}m -Xmx${mem}m -XX:MaxPermSize=${perm}m -XX:ReservedCodeCacheSize=${codecache}m"
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+}
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+
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+require_arg () {
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+ local type="$1"
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+ local opt="$2"
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+ local arg="$3"
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+ if [[ -z "$arg" ]] || [[ "${arg:0:1}" == "-" ]]; then
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+ die "$opt requires <$type> argument"
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+ fi
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+}
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+
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+is_function_defined() {
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+ declare -f "$1" > /dev/null
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+}
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+
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+process_args () {
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+ while [[ $# -gt 0 ]]; do
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+ case "$1" in
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+ -h|-help) usage; exit 1 ;;
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+ -v|-verbose) verbose=1 && shift ;;
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+ -d|-debug) debug=1 && shift ;;
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+
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+ -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
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+ -mem) require_arg integer "$1" "$2" && sbt_mem="$2" && shift 2 ;;
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+ -jvm-debug) require_arg port "$1" "$2" && addDebugger $2 && shift 2 ;;
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+ -batch) exec </dev/null && shift ;;
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+
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+ -sbt-jar) require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
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+ -sbt-version) require_arg version "$1" "$2" && sbt_version="$2" && shift 2 ;;
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+ -java-home) require_arg path "$1" "$2" && java_cmd="$2/bin/java" && shift 2 ;;
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+
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+ -D*) addJava "$1" && shift ;;
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+ -J*) addJava "${1:2}" && shift ;;
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+ *) addResidual "$1" && shift ;;
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+ esac
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+ done
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+
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+ is_function_defined process_my_args && {
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+ myargs=("${residual_args[@]}")
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+ residual_args=()
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+ process_my_args "${myargs[@]}"
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+ }
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+}
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+
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+run() {
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+ # no jar? download it.
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+ [[ -f "$sbt_jar" ]] || acquire_sbt_jar "$sbt_version" || {
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+ # still no jar? uh-oh.
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+ echo "Download failed. Obtain the sbt-launch.jar manually and place it at $sbt_jar"
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+ exit 1
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+ }
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+
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+ # process the combined args, then reset "$@" to the residuals
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+ process_args "$@"
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+ set -- "${residual_args[@]}"
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+ argumentCount=$#
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+
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+ # run sbt
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+ execRunner "$java_cmd" \
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+ ${SBT_OPTS:-$default_sbt_opts} \
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+ $(get_mem_opts $sbt_mem) \
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+ ${java_opts} \
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+ ${java_args[@]} \
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+ -jar "$sbt_jar" \
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+ "${sbt_commands[@]}" \
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+ "${residual_args[@]}"
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+}
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+
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+runAlternateBoot() {
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+ local bootpropsfile="$1"
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+ shift
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+ addJava "-Dsbt.boot.properties=$bootpropsfile"
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+ run $@
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+}
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