#!/bin/sh
#
# Attempt to build listerrors (see examples/Literate.lyx) at build-time
#
# Author: Kayvan Sylvan <kayvan@sylvan.com>

fakeprogram()
{
    L=listerrors
    echo "#!/bin/sh" > $L
    echo 'echo "This is NOT the listerrors program."' >> $L
    echo 'echo ""' >> $L
    echo 'echo "Here was the problem when we tried to build listerrors:"' >> $L
    echo echo "$1" >> $L
    chmod +x $L
    exit 0
}

mywhich()
{
    arg=$1
    for i in `echo $PATH | sed 's/:/ /g'`
    do
        if [ -x $i/$arg ]
        then
            echo $i/$arg
        fi
    done
}

if [ -r ../src/lyx ]
then
    lyx=../src/lyx
else
    lyx=`mywhich lyx`
fi

if [ -z "$lyx" ]
then
    echo "You must build lyx first to build listerrors."
    exit 1
fi

notangle=`mywhich notangle`

if [ -z "$notangle" ]
then
    fakeprogram "The NOWEB notangle was not found."
fi

vncserver=`mywhich vncserver`
if [ -z "$vncserver" ]
then
    # See if DISPLAY is set
    #
    if [ -z "$DISPLAY" ]
    then
        fakeprogram "Could not export Literate.nw. Export needs GUI, fix lyx!"
    else
        $lyx --export tex examples/Literate.lyx
    fi
else
    # Use the vncserver to make a silent export
    if [ -r $HOME/.vnc/passwd ]
    then
        had_vnc_passwd=1
    else
	mkdir $HOME/.vnc > /dev/null 2>&1
        had_vnc_passwd=0
        touch $HOME/.vnc/passwd; chmod 700 $HOME/.vnc/passwd
    fi
    $vncserver :10 -depth 16
    DISPLAY=:10
    export DISPLAY
    $lyx --export tex examples/Literate.lyx
    $vncserver -kill :10
    if [ $had_vnc_passwd -eq 0 ]
    then
        rm $HOME/.vnc/passwd
    fi
fi
mv examples/Literate.tex Literate.nw
$notangle -Rbuild-script Literate.nw | sh