if not modules then modules = { } end modules ['font-imp-checks'] = {
    version   = 1.001,
    comment   = "companion to font-ini.mkiv",
    author    = "Hans Hagen, PRAGMA ADE",
    copyright = "ConTeXt Development Team",
    license   = "see context related readme files"
}

if not context then return end

local function initialize(tfmdata,value)
    if value then
        local characters = tfmdata.characters
        if not characters[0x2012] then
            local data = characters[0x2013]
            local zero = characters[0x0030]
            if data and zero then
                local copy  = table.copy(data)
                local width = zero.width or 0
                if width > 0 then
                    characters[0x2012] = copy
                    copy.effect = {
                        extend = width/copy.width
                    }
                    copy.width = width
                end
            end
        end
   end
end

fonts.handlers.otf.features.register {
    name        = "checkmissing",
    description = "checkmissing",
    manipulators = {
        base = initialize,
        node = initialize,
    }
}