remove caravan_buying param from getValue call

the identity of the selling party doesn't actually affect the value!

docs/changelog.txt

@@ -42,11 +42,13 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 ## Documentation
 
 ## API
+- ``Items::getValue()``: remove ``caravan_buying`` parameter since the identity of the selling party doesn't actually affect the item value
 
 ## Internals
 
 ## Lua
 - ``new()``: improved error handling so that certain errors that were previously uncatchable (creating objects with members with unknown vtables) are now catchable with ``pcall()``
+- ``dfhack.items.getValue()``: remove ``caravan_buying`` param as per C++ API change
 
 ## Removed
 

docs/dev/Lua API.rst

@@ -1773,15 +1773,12 @@ Items module
 
   Calculates the base value for an item of the specified type and material.
 
-* ``dfhack.items.getValue(item[, caravan_state, caravan_buying])``
+* ``dfhack.items.getValue(item[, caravan_state])``
 
   Calculates the value of an item. If a ``df.caravan_state`` object is given
   (from ``df.global.plotinfo.caravans`` or
   ``df.global.main_interface.trade.mer``), then the value is modified by civ
-  properties and any trade agreements that might be in effect. In this case,
+  properties and any trade agreements that might be in effect.
-  specify ``caravan_buying`` as ``true`` to get the price the caravan will pay
-  for the item and ``false`` to get the price that the caravan will sell the
-  item for.
 
 * ``dfhack.items.isRequestedTradeGood(item[, caravan_state])``
 

library/include/modules/Items.h

@@ -191,7 +191,7 @@ DFHACK_EXPORT df::proj_itemst *makeProjectile(MapExtras::MapCache &mc, df::item
 DFHACK_EXPORT int getItemBaseValue(int16_t item_type, int16_t item_subtype, int16_t mat_type, int32_t mat_subtype);
 
 /// Gets the value of a specific item, taking into account civ values and trade agreements if a caravan is given
-DFHACK_EXPORT int getValue(df::item *item, df::caravan_state *caravan = NULL, bool caravan_buying = false);
+DFHACK_EXPORT int getValue(df::item *item, df::caravan_state *caravan = NULL);
 
 DFHACK_EXPORT int32_t createItem(df::item_type type, int16_t item_subtype, int16_t mat_type, int32_t mat_index, df::unit* creator);
 

library/modules/Items.cpp

@@ -1910,13 +1910,6 @@ static int32_t get_sell_request_multiplier(df::item *item, const df::caravan_sta
     return get_sell_request_multiplier(item, caravan_he->resources, &sell_prices->price[0]);
 }
 
-static int32_t get_trade_agreement_multiplier(df::item *item, const df::caravan_state *caravan, bool caravan_buying) {
-    if (!caravan)
-        return DEFAULT_AGREEMENT_MULTIPLIER;
-    return caravan_buying ? get_buy_request_multiplier(item, caravan->buy_prices)
-        : get_sell_request_multiplier(item, caravan);
-}
-
 static bool is_requested_trade_good(df::item *item, df::caravan_state *caravan) {
     auto trade_state = caravan->trade_state;
     if (caravan->time_remaining <= 0 ||
@@ -1942,7 +1935,7 @@ bool Items::isRequestedTradeGood(df::item *item, df::caravan_state *caravan) {
     return false;
 }
 
-int Items::getValue(df::item *item, df::caravan_state *caravan, bool caravan_buying)
+int Items::getValue(df::item *item, df::caravan_state *caravan)
 {
     CHECK_NULL_POINTER(item);
 
@@ -2011,8 +2004,12 @@ int Items::getValue(df::item *item, df::caravan_state *caravan, bool caravan_buy
         value *= 10;
 
     // modify buy/sell prices
-    value *= get_trade_agreement_multiplier(item, caravan, caravan_buying);
+    if (caravan) {
-    value >>= 7;
+        value *= get_buy_request_multiplier(item, caravan->buy_prices);
+        value >>= 7;
+        value *= get_sell_request_multiplier(item, caravan);
+        value >>= 7;
+    }
 
     // Boost value from stack size
     value *= item->getStackSize();