cloned Nullkiller into Nullkiller2

AI/Nullkiller2/Goals/StayAtTown.cpp

@@ -0,0 +1,48 @@
+/*
+* ArmyUpgrade.cpp, part of VCMI engine
+*
+* Authors: listed in file AUTHORS in main folder
+*
+* License: GNU General Public License v2.0 or later
+* Full text of license available in license.txt file, in main folder
+*
+*/
+#include "StdInc.h"
+#include "StayAtTown.h"
+#include "../AIGateway.h"
+#include "../Engine/Nullkiller2.h"
+#include "../AIUtility.h"
+
+namespace NKAI
+{
+
+using namespace Goals;
+
+StayAtTown::StayAtTown(const CGTownInstance * town, AIPath & path)
+	: ElementarGoal(Goals::STAY_AT_TOWN)
+{
+	sethero(path.targetHero);
+	settown(town);
+	movementWasted = static_cast<float>(hero->movementPointsRemaining()) / hero->movementPointsLimit(!hero->inBoat()) - path.movementCost();
+	vstd::amax(movementWasted, 0);
+}
+
+bool StayAtTown::operator==(const StayAtTown & other) const
+{
+	return hero == other.hero && town == other.town;
+}
+
+std::string StayAtTown::toString() const
+{
+	return "Stay at town " + town->getNameTranslated()
+		+ " hero " + hero->getNameTranslated()
+		+ ", mana: " + std::to_string(hero->mana)
+		+ " / " + std::to_string(hero->manaLimit());
+}
+
+void StayAtTown::accept(AIGateway * ai)
+{
+	ai->nullkiller2->lockHero(hero, HeroLockedReason::DEFENCE);
+}
+
+}