#! /bin/bash

##
## Sets and exports env variables and runs a command.
## ProcessID and output of the command can be stored in a file.
##

THIS=`basename $0`

#
# (2003-11-05) problem: getopt doesn't stop parsing as soon as the first
# non-option occurs (although it should according to the doc).
# (2003-12-08) solution: getopt works correctly when POSIXLY_CORRECT is set.
#
export POSIXLY_CORRECT=1

set -- `getopt "e:p:o:q" "$@"` || {

	echo "Usage: `basename $0` [-p pidfile] [-e var=value]* [-o outputfile] [-q]" 1>&2
	exit 42;
}

## iterate over getopt output
## and process immediately
while : 
do
	case "$1" in
	-e) shift; export $1 ;;
	-p) shift; pidfile=$1 ;;
	-o) shift; outfile=$1 ;;
	-q) quiet=true ;;
	--) break ;;
	esac
	shift
done 
shift

function verboseInfo {
   if [ ! "$quiet" ] ; then
      echo "$THIS: $@"
   fi
}


## helper for pidfile, outputfile, etc.
function ensureDirExists {
   if [ $1 ] ; then 
      dir=`dirname $1`
      if [ ! -d $dir ] ; then
         verboseInfo "creating directory $dir"
         mkdir -p $dir
      fi
   fi
}



## execute command
if [ $outfile ] ; then
   ensureDirExists $outfile
   verboseInfo "executing $@ > $outfile &"
   $@ > $outfile &
else
   verboseInfo "executing $@ &"
   $@ &
fi
pid=$!

## store pid in file
if [ $pidfile ] ; then
   ensureDirExists $pidfile
   echo $pid >> $pidfile
   verboseInfo "stored pid $pid in $pidfile"
fi

# This 1 second sleep after starting the commanded process is a workaround for a problem 
# that showed up with JDK 1.7., where most tools started by acscommandcenter would simply 
# stop showing output after the line "accStarter: stored pid .."
sleep 1


## Testcode
## export ble="blubb" ; export -p ;echo $blu