#!/bin/bash
##
## $local/com/CHECK_LINUX_FACILITIES
## http://www.cs.bham.ac.uk/research/poplog/com/CHECK_LINUX_FACILITIES
## To be run before installing Poplog
##
##  Aaron Sloman 30 Nov 2004
##  http://www.cs.bham.ac.uk/~axs/
##
##  13 Jan 2005: reduced the amount of print-out
##
## Check for libraries required for X11 stuff in poplog and
## put links in where necessary.
##
## 14 Feb 2005
## Altered to look in /usr/X11R6/lib64 for libXm.so etc.
##
## 17 Jan 2005
## Fixed minor syntactic bugs detected by Andreas Eder
##  resulting from commenting out 'echo' commands

## First make sure C compiler/linker available

gccloc=`which gcc`

if [ ! -x "$gccloc" ]
then
    echo "WARNING: gcc not found."
    echo "So it will not be possible to link poplog on this machine."
    echo "  You should either take steps to get gcc installed,"
    echo "  or try installing a pre-linked version of poplog"
    echo "  as described in PRE_LINKED_LINUX_POPLOG.txt"
fi

echo ""
echo "-----------------------------------"


## Now check out X window libraries and Motif

## Changed for AMD64
cd /usr/X11R6/lib64

## for testing
#cd /tmp/Xtest


## Test whether file $1 exists. Used several times below
## each time this is run $1 will have a different value
##
check_only()
{
echo ""
echo "Checking for  $1..."

if [ ! -f "$1" ]
then
    echo "/usr/X11R6/lib64/${1} does not exist"
    echo "   --- will look for equivalent to link to."
fi

}

check_only "libX11.so"
check_only "libXt.so"
check_only "libXext.so"
check_only "libXm.so"

echo ""
echo "-----------------------------------"


## check_and_fix must be run by super-user
## tests whether file $1 exists and if not whether a suitable
## version exists which can be linked to it.
## E.g. if libXt.so does not exist but libXt.so.6.3 is found then
## the latter can be linked to libXt.so (in /usr/X11R6/lib/).

## variable to record missing files
failed=""

## each time this is run $1 will have a different value
##
check_and_fix()
{
echo ""
echo "Checking whether something needs to be linked to" $1

if [ ! -f "$1" ]
then
    ## The .so file does not exist.
    ## See if there are versions that have version numbers appended
    for file in ${1}* ;
    do
        if [ -f $file ]
        then
            ## found a suitable file, so make a symbolic link
            echo Linking $file to $1 ;
            ln -s $file $1 ;

            ## stop trying any more file names
            break;
        fi
    done

    # check if successful
    if [ -f "$1" ]
    then
        echo ""
        ##echo "$1 linked"
    else
        echo "   /usr/X11R6/lib64/${1}* not found"
        failed="$failed $1"
    fi
fi

}

## The string $failed may be extended by check_and_fix
failed=""

check_and_fix  "libX11.so"
check_and_fix "libXext.so"
check_and_fix "libXt.so"


if [ "$failed" ]
then
    ## Report missing libraries
    echo ""
    echo "X WINDOW LIBRARIES MISSING"
    echo "Could not find $failed"
    echo "  nor files with version numbers to link them to".
    echo "Cannot run poplog with graphical (X window) facilities"
    echo "   Investigate installation of X Window system with libraries"
    echo "   to support development work on your linux system"
    echo "   (see either www.xfree86.org or www.x.org)"
    echo ""
    echo "Alternatively you can install poplog without using X window system"
    nox="true"
else
    echo ""
    echo "Good! The core required X window system libraries are available."
    echo "Poplog should link and run with the X Window system."
    nox=""
fi

echo ""
echo "-----------------------------------"
echo ""
echo "Now checking for Motif"


xx="libXm.so"
xx3="libXm.so.3"
xx2="libXm.so.2"
# last option is for Lesstif
xx1="libXm.so.1"

nomotif=""

if [ -f "$xx" ]
then

    echo "Good: $xx already exists"

else

    for file in ${xx3}* ${xx2}* ${xx1}*;
    do
        if [ -f $file ]
        then
            ## Found a version of Motif, so link it to the .so file
            echo Linking $file to $xx ;
            ln -s $file $xx ;
            break;
        fi
    done

    # check if successful
    if [ -f "$xx" ]
    then
        echo ""
        ##echo "$xx linked"
    else
        echo "   /usr/X11R6/lib64/${xx}* not found."
        echo "   Please check out your motif installation."
        nomotif="true"
    fi
fi


if [ "$nomotif" ]
then
    echo "Could not find Motif (or Lesstif)"
    echo "Cannot run poplog with Motif even if X libraries installed"
else
    echo "Motif OK"
    echo ""
    if [ "$nox" ]
    then
        echo "But other X libraries missing -- so cannot use Motif"
    else
        echo "Poplog should link OK with X and Motif"
        exit 0
    fi
fi

## indicate failure
exit 1