limiting items to specific races

src/common/kernel/battle.c

@@ -636,6 +636,14 @@ select_weapon(const troop t, boolean attacking, boolean ismissile)
   return preferred_weapon(t, attacking);
 }
 
+static boolean can_use(const unit * u, const weapon_type * wtype)
+{
+  if (wtype->itype->canuse) {
+    return wtype->itype->canuse(u, wtype->itype);
+  }
+  return true;
+}
+
 static int
 weapon_skill(const weapon_type * wtype, const unit * u, boolean attacking)
   /* the 'pure' skill when using this weapon to attack or defend.
@@ -648,7 +656,7 @@ weapon_skill(const weapon_type * wtype, const unit * u, boolean attacking)
     skill = effskill(u, SK_WEAPONLESS);
     if (skill<=0) {
       /* wenn kein waffenloser kampf, dann den rassen-defaultwert */
-      if(u->race == new_race[RC_URUK]) {
+      if (u->race == new_race[RC_URUK]) {
         int sword = effskill(u, SK_MELEE);
         int spear = effskill(u, SK_SPEAR);
         skill = MAX(sword, spear) - 3;
@@ -680,10 +688,11 @@ weapon_skill(const weapon_type * wtype, const unit * u, boolean attacking)
     }
   } else {
     /* changed: if we own a weapon, we have at least a skill of 0 */
+    if (!can_use(u, wtype)) return -1;
     skill = effskill(u, wtype->skill);
     if (skill < wtype->minskill) skill = 0;
     if (skill > 0) {
-      if(attacking) {
+      if (attacking) {
         skill += u->race->at_bonus;
       } else {
         skill += u->race->df_bonus;
@@ -3220,10 +3229,12 @@ make_fighter(battle * b, unit * u, side * s1, boolean attack)
       if (wtype==NULL || itm->number==0) continue;
       weapons[w].attackskill = weapon_skill(wtype, u, true);
       weapons[w].defenseskill = weapon_skill(wtype, u, false);
-      weapons[w].type = wtype;
-      weapons[w].used = 0;
-      weapons[w].count = itm->number;
-      ++w;
+      if (weapons[w].attackskill>=0 || weapons[w].defenseskill>=0) {
+        weapons[w].type = wtype;
+        weapons[w].used = 0;
+        weapons[w].count = itm->number;
+        ++w;
+      }
       assert(w!=WMAX);
     }
     fig->weapons = calloc(sizeof(weapon), w+1);

src/common/kernel/item.h

@@ -127,6 +127,7 @@ typedef struct item_type {
   int capacity;
   struct construction * construction;
   /* --- functions --- */
+  int (*canuse)(const struct unit * user, const struct item_type * itype);
   int (*use)(struct unit * user, const struct item_type * itype, int amount, struct order * ord);
   int (*useonother)(struct unit * user, int targetno, const struct item_type * itype, int amount, struct order * ord);
   int (*give)(struct unit * src, struct unit * dest, const struct item_type * itm, int number, struct order * ord);

src/common/kernel/xmlreader.c

@@ -862,8 +862,10 @@ xml_readitem(xmlXPathContextPtr xpath, resource_type * rtype)
         itype->give = (int (*)(struct unit*, struct unit*, const struct item_type *, int, struct order *))fun;
       } else if (strcmp((const char*)propValue, "use")==0) {
         itype->use = (int (*)(struct unit *, const struct item_type *, int, struct order *))fun;
+      } else if (strcmp((const char*)propValue, "canuse")==0) {
+        itype->canuse = (int (*)(const struct unit *, const struct item_type *))fun;
       } else if (strcmp((const char*)propValue, "useonother")==0) {
-        itype->useonother = (int (*)(struct unit *, int targetno, const struct item_type *, int, struct order *))fun;
+        itype->useonother = (int (*)(struct unit *, int, const struct item_type *, int, struct order *))fun;
       } else {
         log_error(("unknown function type '%s' for item '%s'\n",
           (const char*)propValue, rtype->_name[0]));

src/eressea/tolua/helpers.c

@@ -313,6 +313,37 @@ lua_getresource(unit * u, const struct resource_type * rtype)
   return result;
 }
 
+static int
+lua_canuse_item(const unit * u, const struct item_type * itype)
+{
+  lua_State * L = (lua_State *)global.vm_state;
+  int result = -1;
+  const char * fname = "item_canuse";
+
+  lua_pushstring(L, fname);
+  lua_rawget(L, LUA_GLOBALSINDEX);
+  if (lua_isfunction(L, 1)) {
+    tolua_pushusertype(L, (void *)u, "unit");
+    tolua_pushstring(L, itype->rtype->_name[0]);
+
+    if (lua_pcall(L, 2, 1, 0)!=0) {
+      const char* error = lua_tostring(L, -1);
+      log_error(("get(%s) calling '%s': %s.\n",
+        unitname(u), fname, error));
+      lua_pop(L, 1);
+    } else {
+      result = lua_toboolean(L, -1);
+      lua_pop(L, 1);
+    }
+  } else {
+    log_error(("get(%s) calling '%s': not a function.\n",
+      unitname(u), fname));
+    lua_pop(L, 1);
+  }
+
+  return result;
+}
+
 static int
 lua_wage(const region * r, const faction * f, const race * rc)
 {
@@ -505,6 +536,7 @@ register_tolua_helpers(void)
   register_function((pf_generic)&lua_initfamiliar, "lua_initfamiliar");
   register_item_use(&lua_useitem, "lua_useitem");
   register_function((pf_generic)&lua_getresource, "lua_getresource");
+  register_function((pf_generic)&lua_canuse_item, "lua_canuse_item");
   register_function((pf_generic)&lua_changeresource, "lua_changeresource");
   register_function((pf_generic)&lua_equipmentcallback, "lua_equip");