cat < Colorized Diff 
XX

echo -n ''

first=1
diffseen=0
lastonly=0

OIFS=$IFS
IFS='
'

# The -r option keeps the backslash from being an escape char.
read -r s

while [[ $? -eq 0 ]]
do
    # Get beginning of line to determine what type
    # of diff line it is.
    t1=${s:0:1}
    t2=${s:0:2}
    t3=${s:0:3}
    t4=${s:0:4}
    t7=${s:0:7}

    # Determine HTML class to use.
    if    [[ "$t7" == 'Only in' ]]; then
        cls='only'
        if [[ $diffseen -eq 0 ]]; then
            diffseen=1
            echo -n ''
        else
            if [[ $lastonly -eq 0 ]]; then
                echo ""
            fi
        fi
        if [[ $lastonly -eq 0 ]]; then
            echo "
"
        fi
        lastonly=1
    elif [[ "$t4" == 'diff' ]]; then
        cls='diff'
        if [[ $diffseen -eq 0 ]]; then
            diffseen=1
            echo -n ''
        else
            echo "
"
        fi
        echo "
"
        lastonly=0
    elif  [[ "$t3" == '+++'  ]]; then
        cls='plus3'
        lastonly=0
    elif  [[ "$t3" == '---'  ]]; then
        cls='minus3'
        lastonly=0
    elif  [[ "$t2" == '@@'   ]]; then
        cls='at2'
        lastonly=0
    elif  [[ "$t1" == '+'    ]]; then
        cls='plus'
        lastonly=0
    elif  [[ "$t1" == '-'    ]]; then
        cls='minus'
        lastonly=0
    else
        cls=
        lastonly=0
    fi

    # Convert &, <, > to HTML entities.
    s=$(sed -e 's/\&/\&/g' -e 's//\>/g' <<<"$s")
    if [[ $first -eq 1 ]]; then
        first=0
    else
        echo
    fi

    # Output the line.
    if [[ "$cls" ]]; then
        echo -n ''${s}''
    else
        echo -n ${s}
    fi
    read -r s
done
IFS=$OIFS

if [[ $diffseen -eq 0  &&  $onlyseen -eq 0 ]]; then 
    echo -n ''
else
    echo "
"
fi
echo

cat <


XX

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