server/scripts/eressea/resources.lua

-- global functions used in items.xml

if not item_canuse then
    -- define a default, everyone can use everything
    function item_canuse(u, iname)
        return true
    end
end

function peasant_getresource(u)
  return u.region:get_resource("peasant")
end

function peasant_changeresource(u, delta)
  local p = u.region:get_resource("peasant")
  p = p + delta
  if p < 0 then
    p = 0
  end
  u.region:set_resource("peasant", p)
  return p
end

function hp_getresource(u)
  return u.hp
end

function hp_changeresource(u, delta)
  local hp = u.hp + delta
  
  if hp < u.number then
    if hp < 0 then
      hp = 0
    end
    u.number = hp
  end
  u.hp = hp
  return hp
end

function horse_limit(r)
  return r:get_resource("horse")
end

function horse_produce(r, n)
  local horses = r:get_resource("horse")
  if horses>=n then
    r:set_resource("horse", horses-n)
  else
    r:set_resource("horse", 0)
  end
end

function log_limit(r)
--  if r:get_flag(1) then -- RF_MALLORN
--    return 0
--  end
  return r:get_resource("tree") + r:get_resource("sapling")
end

function log_produce(r, n)
  local trees = r:get_resource("tree")
  if trees>=n then
    r:set_resource("tree", trees-n)
  else
    r:set_resource("tree", 0)
    n = n - trees
    trees = r:get_resource("sapling")
    if trees>=n then
      r:set_resource("sapling", trees-n)
    else
      r:set_resource("sapling", 0)
    end
  end
end

function mallorn_limit(r)
  if not r:get_flag(1) then -- RF_MALLORN
    return 0
  end
  return r:get_resource("tree") + r:get_resource("sapling")
end

function mallorn_produce(r, n)
  local trees = r:get_resource("tree")
  if trees>=n then
    r:set_resource("tree", trees-n)
  else
    r:set_resource("tree", 0)
    n = n - trees
    trees = r:get_resource("sapling")
    if trees>=n then
      r:set_resource("sapling", trees-n)
    else
      r:set_resource("sapling", 0)
    end
  end
end