# -*- mode: sh -*-

function removefrom()
{
    local varname=$1
    local entry="$2"

    unset newvar
    for value in `IFS=: eval echo \\$$varname`; do
	if [ "$value" != "$entry" ]; then
	    newvar="${newvar}${newvar+:}${value}"
	fi
    done

    # Set it again
    eval $varname="$newvar"
    unset newvar
}

function addto()
{
    local varname=$1
    local newvalue=$2
    eval $varname="$newvalue:\${$varname}"
    eval $varname=\${$varname/%:}
}

function cdreplace()
{
    newdir=${PWD/$1/$2}
    command cd "$newdir"
}

function updatedirs()
{
    # initialise variables
    local devhome=${DEVHOME-$HOME}
    local srchome=${SRCHOME-$devhome/src}
    local objhome=${OBJHOME-$devhome/obj}

    # the other ones
    export srcdir=$PWD
    export objdir=$PWD

    # find out if we're in src or obj
    case $PWD in
	$srchome*)
	    # we're in a srcdir - try to find the objdir
	    objdir=${PWD/#$srchome/$objhome}
	    ;;
	$objhome*)
	    # we're in an objdir - try to find the srcdir
	    srcdir=${PWD/#$objhome/$srchome}
	    ;;
    esac

    if [ \! -d $srcdir ]; then
	srcdir=$PWD
    fi
    if [ \! -d $objdir ]; then
	objdir=$PWD
    fi
}

function cd()
{
    if [ $# -eq 2 ]; then
	cdreplace "$1" "$2"
    else
	command cd "$@"
    fi
    updatedirs
}

function pushd()
{
    command pushd "$@"
    updatedirs
}

function popd()
{
    command popd
    updatedirs
}

function src()
{
    cd obj src
}

function obj()
{
    cd src obj
}

function qt()
{
    local devhome=${DEVHOME-$HOME}
    local srchome=${SRCHOME-$devhome/src}
    local objhome=${OBJHOME-$devhome/obj}
    local qthome=${QTHOME-$objhome/troll}

    # Get or set the Qt version
    if [ $# -eq 0 ]; then
	# Get the Qt version
	if [ -z "$QTDIR" ]; then
	    echo "Not using Qt."
	else
	    ver=${QTDIR/#$qthome\/qt}
	    ver=${ver/#-}
	    echo "Using Qt $ver"
	fi
    else
	# Set the working Qt version
	wanted=$qthome/qt-$1
	test -d $wanted || wanted=$qthome/qt$1

	if [ ! -d $wanted ]; then
	    echo "Cannot find Qt $1"
	else
	    # Remove old
	    removefrom PATH $QTDIR/bin
	    removefrom LD_LIBRARY_PATH $QTDIR/lib
	    removefrom PKG_CONFIG_PATH $QTDIR/lib

	    # Add new
	    QTDIR=$wanted
	    addto PATH $QTDIR/bin
	    addto LD_LIBRARY_PATH $QTDIR/lib
	    addto PKG_CONFIG_PATH $QTDIR/lib

	    echo "Using Qt $1"
	fi
    fi
}

function kde3()
{
    # Remove the current KDE from variables
    removefrom PATH $KDEDIR/bin
    removefrom LD_LIBRARY_PATH $KDEDIR/lib
    unset QT_PLUGIN_PATH
    unset KDEHOME
    unset KDETMP
    unset KDEVARTMP

    # Add the new ones
    export KDEDIR=/usr/local/kde3
    export KDEDIRS=$KDEDIR:/usr
    export PATH=$KDEDIR/bin:$PATH
    export XDG_CONFIG_DIRS=$KDEDIR/etc/xdg

    echo "Using KDE 3 ($KDEDIR)"
}

function kde4()
{
    # Remove the current KDE from variables
    removefrom PATH $KDEDIR/bin
    removefrom LD_LIBRARY_PATH $KDEDIR/lib
    unset QT_PLUGIN_PATH

    # Add the new one
    export KDEDIR=$HOME/KDE4
    export KDEDIRS=$KDEDIR
    export KDEHOME=$HOME/.kde4
    export KDETMP=${TMPDIR-/tmp}/kde4-$USER
    export KDEVARTMP=/var/tmp/kde4cache-$USER
    export KDE_DATA_DIRS=$KDEDIR/share
    export PATH=$KDEDIR/bin:$PATH
    export XDG_CONFIG_DIRS=$KDEDIR/etc/xdg

    # Ensure that they exist
    mkdir -p $KDEDIR $KDETMP $KDEVARTMP

    echo "Using KDE 4 ($KDEDIR)"
}