#!/bin/sh

# $Header$
#
#
# startup script for smalltalk
# actually, simply calls stx, passing all arguments.
#

# In previous versions, smalltalk used to be the executable itself.
# This lead to problems on systems, where things like LD_LIBRARY_PATH
# should be set in advance. 
# Now, here is a place to do such things ...

#
# -x name specifies an explicit executable
#         to avoid executing another stx from some directory along the PATH
#         (i.e to force use: ./smalltalk -x ./stx)
#
# -X name specifies an explicit path to the stx executable 
#         to avoid executing another stx from some directory along the PATH
#         (i.e to force use: ./smalltalk -X .)
#         [almost the same as above]
#
# -ldd    show ldd-output (to debug, which libs are loaded)
#
# all other args go to stx & the user classes
#

STX=stx
STX_BINDIR=.
DEBUGGER=


if test -x `dirname $0`/stx; then
    STX_BINDIR=`dirname $0`
    STX=$STX_BINDIR/stx
#    cd $STX_BINDIR
fi

if [ "$STX_LIBDIR" != "" ]
then
    if [ ! -f $STX_LIBDIR/smalltalk.rc ]
    then
       echo "smalltalk [warning]: ignore wrong STX_LIBDIR setting"
       STX_LIBDIR=""
    fi
fi


# notice: STXLIBDIR is filled in here by install-sh script
if test -z "$STX_LIBDIR"
then
    bindir=`dirname $0`
    case "$bindir" in
        /* )
        ;;
        .* )
        bindir=`( cd $bindir; pwd ) 2> /dev/null`
        ;;
    esac
    if [ -d ${bindir}/../lib ]
    then
        STX_LIBDIR=`cd ${bindir}/../lib ; pwd`
    fi
fi

if [ -z "$STX_LIBDIR" ]
then
    if [ -d ../lib ]
    then
        STX_LIBDIR=`cd ../lib ; pwd`
    fi
fi
if [ ! -d "$STX_LIBDIR" ]
then
    if [ -d ../lib ]
    then
        STX_LIBDIR=`cd ../lib ; pwd`
    fi
fi

if test -z "$STX_PACKAGEDIR"
then
    if [ -d ../packages ]
    then
        STX_PACKAGEDIR=`cd .. ; pwd`
    else
        if [ -d $STX_LIBDIR/../packages ]
        then
            STX_PACKAGEDIR=`cd $STX_LIBDIR/../packages ; pwd`
        else
            if [ -f $STX_BINDIR/smalltalk.rc ]
            then
                STX_PACKAGEDIR=`cd $STX_BINDIR/../../.. ; pwd`
            fi
        fi
    fi
fi



if test -z "$STX_TOPDIR"
then
    if [ -f ../lib/smalltalk.rc ]
    then
        STX_TOPDIR=`cd .. ; pwd`
    else
       if [ -f $STX_LIBDIR/../lib/smalltalk.rc ]
       then
           STX_TOPDIR=`cd $STX_LIBDIR/.. ; pwd`
       else
           if [ -f $STX_BINDIR/smalltalk.rc ]
           then
              STX_TOPDIR=`cd $STX_BINDIR/../.. ; pwd`
           fi
       fi
    fi
fi

# echo STX_LIBDIR is $STX_LIBDIR
# echo STX_TOPDIR is $STX_TOPDIR
# echo STX_PACKAGEDIR is $STX_PACKAGEDIR

export STX_LIBDIR STX_PACKAGEDIR STX_TOPDIR

# echo STX is $STX


if [ "$1" = "--help" ]
then    
    echo "
usage: smalltalk [-x prog] [-X dir] [--ldd] [--gdb] 

args to startup script:
   -x prog ................ use prog instead of stx as executable
   -X dir ................. use stx from dir instead of default (PATH)
   --ldd .................. show which shared libraries are used
   --gdb .................. run with gdb-Debugger (type r in debugger to start)
   --cgdb ................. run with cgdb-Debugger (type r in debugger to start)
   --callgrind ............ run under callgrind profiler tool
   --stap SCRIPT .......... run given systemtap script, passing stx command as 
                            stap -c 'stx ...' Systemtap may not be compiled in.
"
    exec $STX --help
    exit 0
fi

if [ "$1" = "-x" ]
then
    shift
    STX=$1
    shift
fi

if [ "$1" = "-X" ]
then
    shift
    STX=$1/stx
    shift
fi

if [ "$1" = "--gdb" ]
then
    shift
    DEBUGGER=gdb
fi

if [ "$1" = "--cgdb" ]
then
    shift
    DEBUGGER=cgdb
fi

if [ "$1" = "--callgrind" ]
then
    shift
    DEBUGGER="valgrind --tool=callgrind --instr-atstart=no"
fi

if [ "$1" = "--stap" ]
then
    shift
    if [ -z "$1" ]; then 
        echo "--stap requires systemtap script to run"
        exit 1
    fi
    if [ ! -r "$1" ]; then
        echo "$1 is not a readable systemtap script"
        echo "--stap requires systemtap script to run"
        exit 1
    fi
    STAPSCRIPT=$1
    shift
fi


if [ "$1" = "--ldd" ]
then
    shift
    DEBUGLIB=yes
fi

#
#
# some have Xlibs in /usr/openwin/lib ...
#
if [ -d /usr/openwin/lib ]
then
    if [ "$LD_LIBRARY_PATH" != "" ]
    then
    LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/openwin/lib:/usr/local/lib/smalltalk/lib
    else
    LD_LIBRARY_PATH=/usr/openwin/lib:/usr/local/lib/smalltalk/lib
    fi
    if [ "$SHLIB_PATH" != "" ]
    then
    SHLIB_PATH=$SHLIB_PATH:/usr/openwin/lib:/usr/local/lib/smalltalk/lib
    else
    SHLIB_PATH=/usr/openwin/lib:/usr/local/lib/smalltalk/lib
    fi
else
    if [ "$LD_LIBRARY_PATH" != "" ]
    then
    LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/smalltalk/lib
    else
    LD_LIBRARY_PATH=/usr/local/lib/smalltalk/lib
    fi
    if [ "$SHLIB_PATH" != "" ]
    then
    SHLIB_PATH=$SHLIB_PATH:/usr/local/lib/smalltalk/lib
    else
    SHLIB_PATH=/usr/local/lib/smalltalk/lib
    fi
fi

#
# my own libs may be found in STX_LIBDIR/lib
# STX_LIBDIR is to be set to the top of the smalltalk installation
# (i.e. where all the .rc files are located)
#

if [ "$STX_LIBDIR" != "" ]
then
    if [ "$STX_LIBDIR" != "/usr/local/smalltalk" ]
    then
    LD_LIBRARY_PATH=$STX_LIBDIR:$STX_LIBDIR/lib:$LD_LIBRARY_PATH
    SHLIB_PATH=$STX_LIBDIR:$STX_LIBDIR/lib:$SHLIB_PATH
    fi
else
    STX_LIBDIR=$STX_BINDIR
fi

#
# and in STX_BINDIR
#

if [ "$STX_BINDIR" != "" ]
then
    if [ "$STX_BINDIR" != "/usr/local/bin" ]
    then
    LD_LIBRARY_PATH=$STX_BINDIR:$LD_LIBRARY_PATH
    SHLIB_PATH=$STX_BINDIR:$SHLIB_PATH
    fi
fi

LD_LIBRARY_PATH=.:./lib:$LD_LIBRARY_PATH
SHLIB_PATH=.:./lib:$SHLIB_PATH
export LD_LIBRARY_PATH
export SHLIB_PATH

#
# if started via ./smalltalk, prepend . to the PATH 
# (to allow test of ./stx even when stx is found along the PATH)
#
case $0 in
    ./*)
    PATH=.:$PATH
    export PATH
    ;;
esac

#
# debugging which stx & shared libs are used ...
#
whichOne=`/bin/sh -c "type $STX"`
if [ "$STX" = "stx" ]
then
  if [ -f stx ]
  then
    whichOne=`/bin/sh -c "type stx"`
    if [ "$whichOne" != "stx is ./stx" ]
    then
      echo "************* WARNING the executed" $whichOne
      echo "************* (may not be appropriate for used shared libs)"
      echo "************* Try './smalltalk -ldd' for more details"
      echo "************* or force the local stx to be used with"
      echo "************* './smalltalk -x ./stx'"
      echo
    fi
  fi
fi

if [ "$DEBUGLIB" = "yes" ]
then
  echo "used " $whichOne
  echo "used LD_LIBRARY_PATH is " $LD_LIBRARY_PATH
  echo "used SHLIB_PATH is " $SHLIB_PATH
  echo "used STX_LIBDIR is " $STX_LIBDIR
  case `uname` in
    HP-UX*)
      chatr $STX
      ;;

    *)
      ldd -r $STX
      ;;
  esac
fi

#
# how did HP mess up things so badly ?
# It takes a veeeery long time for stx to start
# (the spinning wheel is shown when stx's main 
#  starts to run - all the time in between is
#  spent in the systems loader ...)
#
# if [ "`uname`" = "HP-UX" ]
# then
#     echo "Please be patient - hp systems are very slow."
# fi

PATH=$PATH:$STX_BINDIR
export PATH
# echo PATH is $PATH
# echo DISPLAY is $DISPLAY



if [ ! -z "$STAPSCRIPT" ]; then
    echo "$STX_TOPDIR/stx/hacking/tapset"
    CMD="$STX $@"
    echo "$CMD"
    exec stap --unprivileged $STAPSCRIPT -I "$STX_TOPDIR/hacking/tapset" -c "$CMD"
fi



exec $DEBUGGER $STX ${1+"$@"}