forked from your-land-mirror/yl_speak_up
80 lines
2.3 KiB
Lua
80 lines
2.3 KiB
Lua
-----------------------------------------------------------------------------
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-- limits for trading: maximum and minimum stock to keep
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-----------------------------------------------------------------------------
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-- sometimes players may not want the NPC to sell *all* of their stock,
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-- or not let the NPC buy endless amounts of something when only a limited
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-- amount is needed
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-----------------------------------------------------------------------------
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-- helper function: make sure all necessary entries in the trades table exist
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yl_speak_up.setup_trade_limits = function(dialog)
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if(not(dialog)) then
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dialog = {}
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end
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if(not(dialog.trades)) then
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dialog.trades = {}
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end
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if(not(dialog.trades.limits)) then
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dialog.trades.limits = {}
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end
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if(not(dialog.trades.limits.sell_if_more)) then
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dialog.trades.limits.sell_if_more = {}
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end
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if(not(dialog.trades.limits.buy_if_less)) then
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dialog.trades.limits.buy_if_less = {}
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end
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return dialog
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end
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-- helper function: count how many items the NPC has in his inventory
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-- empty stacks are counted under the key "";
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-- for other items, the amount of items of each type is counted
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yl_speak_up.count_npc_inv = function(n_id)
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if(not(n_id)) then
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return {}
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end
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-- the NPC's inventory
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local npc_inv = minetest.get_inventory({type="detached", name="yl_speak_up_npc_"..tostring(n_id)})
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if(not(npc_inv)) then
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return {}
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end
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local anz = npc_inv:get_size('npc_main')
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local stored = {}
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for i=1, anz do
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local stack = npc_inv:get_stack('npc_main', i )
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local name = stack:get_name()
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local count = stack:get_count()
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-- count empty stacks
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if(name=="") then
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count = 1
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end
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-- count how much of each item is there
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if(not(stored[ name ])) then
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stored[ name ] = count
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else
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stored[ name ] = stored[ name ] + count
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end
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end
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return stored
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end
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-- helper function: update the items table so that it reflects a limitation
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-- items is a table (list) with these entries:
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-- [1] 0 in stock;
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-- [2] sell if more than 0;
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-- [3] buy if less than 10000;
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-- [4] item is part of a trade offer
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yl_speak_up.insert_trade_item_limitation = function( items, k, i, v )
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if( i<1 or i>4) then
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return;
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end
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if( not( items[ k ] )) then
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-- 0 in stock; sell if more than 0; buy if less than 10000; item is part of a trade offer
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items[ k ] = { 0, 0, 10000, false, #items }
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end
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items[ k ][ i ] = v
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end
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