Bash wrapper script for snpeff

snpeff

#!/bin/bash
# snpEff executable shell script
# http://snpeff.sourceforge.net/
# Extracts memory and system property Java arguments from the list of provided arguments
# (ie -Xms 1g -Xmx 2g)

jardir="$(cd "$(dirname "$0")" && pwd -P)"

java=java
if [ -e "$JAVA_HOME/bin/java" ]
then
java="$JAVA_HOME/bin/java"
fi

default_jvm_mem_opts="-Xms512m -Xmx1g"
jvm_mem_opts=""
jvm_prop_opts=""
pass_args=""
for arg in "$@"; do
    case $arg in
        '-D'*)
            jvm_prop_opts="$jvm_prop_opts $arg"
            ;;
         '-Xm'*)
            jvm_mem_opts="$jvm_mem_opts $arg"
            ;;
         *)
            pass_args="$pass_args $arg"
            ;;
    esac
done

if [ "$jvm_mem_opts" == "" ]; then
    jvm_mem_opts="$default_jvm_mem_opts"
fi
if [[ "$pass_args" != "" && "$pass_args" != *-c* ]]; then
    pass_args="$pass_args -c ${jardir}/snpEff.config"
fi

exec java $jvm_mem_opts $jvm_prop_opts -jar ${jardir}/snpEff.jar $pass_args
exit

@chapmanb I came across this gist because it's included as the launcher for latest SnpEff releases. It's a good model for building jar file launcher scripts. Seeing that it's a few years old now, I'm wondering if there's anything you would change today? The bare exit call at the bottom looks odd to me, whats the purpose?