ananash

#!/bin/bash
myself=`readlink -f "$0"`
mydir=`dirname "$myself"`

unset TMPFILE



function myexit(){
  [ -n "$TMPFILE" ] && rm -f "$TMPFILE"
  exit 0
}

trap myexit 2 3 13 16

function die(){
    echo "$0"
    myexit 1
}

function check_rootsys(){
    if [ -z "$ROOTSYS" ]; then
	which root 1>/dev/null 2>&1
	if [ $? != 0 ]; then # ROOT environment not set-up
	    cat <<EOF
ROOT environment is not set up. Please specify a ROOTSYS path. Shell command can be run by prefixing it with a !, for instance:
!ls /afs/cern.ch/sw/lcg/app/releases/ROOT
Type CTRL-C to exit.
EOF
	    unset ROOTSYS
	    while [ -z "$ROOTSYS" ]; do
		echo -n "ROOTSYS: "
		read rep
		sh_cmd=`echo "$rep" | sed -n 's/^!\(.*\)/\1/p'`
		if [ -n "$sh_cmd" ]; then
		    eval "$sh_cmd"
		    continue
		fi
		if [ ! -d "$rep" ]; then
		    echo "$rep is not a directory."
		    continue
		fi
		export ROOTSYS="$rep"
		PATH="$PATH:$ROOTSYS/bin"
		export LD_LIBRARY_PATH="$ROOTSYS/lib${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH"
	    done
	fi
    fi
}

#----------- MAIN

check_rootsys

cd "$mydir"
[ $? = 0 ] || die "Failed to move into directory $mydir."

unset ANANAS #to force setup

curdir="`pwd`"

TMPFILE="`mktemp -t ananas.XXXXXXXXXX`" && {
        cat  >"$TMPFILE" <<EOF
source "$HOME/.bashrc"
cd "$mydir" && { source ./setup; cd "$cudir"; }
PS1="[ANANAS] \$PS1"
EOF
        bash --rcfile "$TMPFILE"
        rm -f "$TMPFILE"
}