eregions.hud = {}

minetest.register_globalstep (function (dtime)

    for _, player in pairs(minetest.get_connected_players()) do
        local name = player:get_player_name()
        local pos = vector.round(player:getpos())
        local eregionStrings = {}

        for id, eregion in pairs (eregions:getERegionsAtPos (pos)) do
            table.insert (eregionStrings, ("%u %s")
                :format (id, eregion.efeature))
        end

        for i, eregion in pairs (eregions:getExternalHudEntries (pos)) do
            local str = ""
            if eregion.id then str = str.."["..eregion.id.."] " end
            if eregion.efeature then str = str.."("..eregion.efeature..")" end
            table.insert (eregionStrings, str)
        end

        local eregionString = "Features:"
        if #eregionStrings > 0 then
            eregionString = eregionString .. "\n"
                .. table.concat (eregionStrings, "\n")
        end

        local  hud = eregions.hud [name]
        if not hud then
            hud = {}
            eregions.hud[name] = hud
            hud.eregionsId = player:hud_add ({
                hud_elem_type = "text",
                name = "ERegions",
                number = 0xFFFFFF,
                position = {x=0, y=0.8},
                offset = {x=8, y=-8},
                text = eregionString,
                scale = {x=200, y=60},
                alignment = {x=1, y=-1},
            })
            hud.oldERegions = eregionString
            return
        elseif hud.oldERegions ~= eregionString then
            player:hud_change(hud.eregionsId, "text", eregionString)
            hud.oldERegions = eregionString
        end
    end
end)

minetest.register_on_leaveplayer (function(player)
    eregions.hud[player:get_player_name()] = nil
end)