Eskil

    addValidator -plugin optValidatePlugin
    addOpt   -plugininfo
    docFlag  -plugininfo "Pass info to plugin (plugin specific)"
    addOpt   -plugindump
    docFlag  -plugindump "Dump plugin source to stdout"
    # These options affect Pref
    addPrefOpt -pivot             pivot             optValidatePositive
    docFlag    -pivot "Pivot setting for diff algorithm (100)"
    addPrefOpt -context           context           optValidateNatural
    docFlag    -context "Show only differences, with <n> lines of context"
    addPrefOpt -printHeaderSize   printHeaderSize   optValidatePositive
    addPrefOpt -printCharsPerLine printCharsPerLine optValidatePositive
    addPrefOpt -printPaper        printPaper        optValidatePaper
    addPrefOpt -printColorChange  printColorChange  optValidatePdfColor
    addPrefOpt -printColorOld     printColorOld     optValidatePdfColor  

        set ::DefaultPref(fontsize) 8
    }
    # Maybe base default font on TkFixedFont ?
    set ::DefaultPref(fontfamily) Courier
    set ::DefaultPref(ignore) "-b"
    set ::DefaultPref(nocase) 0
    set ::DefaultPref(noempty) 0
    set ::DefaultPref(pivot) 100
    set ::DefaultPref(nodigit) 0
    set ::DefaultPref(parse) 2
    set ::DefaultPref(lineparsewords) 0
    set ::DefaultPref(colorequal) ""
    set ::DefaultPref(colorchange) red
    set ::DefaultPref(colornew1) darkgreen
    set ::DefaultPref(colornew2) blue