Created a combat system to start with and also added a 'HEARING' mechanic where enemies can hear you from a certain distance before moving to you.

combat.cpp

@@ -0,0 +1,14 @@
+#include "combat.hpp"
+#include "rand.hpp"
+
+int Combat::fight(Combat &target) {
+  int attack = Random::uniform<int>(0,1);
+  int my_dmg = 0;
+
+  if(attack) {
+    my_dmg = Random::uniform<int>(1, damage);
+    target.hp -= my_dmg;
+  }
+
+  return my_dmg;
+}

combat.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "components.hpp"
+
+struct Combat {
+  int hp;
+  int damage;
+  bool dead;
+
+  int fight(Combat &target);
+};

components.hpp

@@ -1,6 +1,7 @@
 #pragma once
 #include "dinkyecs.hpp"
 #include "map.hpp"
+#include "combat.hpp"
 #include <deque>
 
 namespace Components {
@@ -17,11 +18,6 @@ namespace Components {
     int dy;
   };
 
-  struct Combat {
-    int hp;
-    int damage;
-  };
-
   struct Treasure {
     int amount;
   };

gui.cpp

@@ -164,6 +164,7 @@ void GUI::run_systems() {
   System::enemy_pathing($world, $game_map, player);
   System::motion($world, $game_map);
   System::combat($world, player);
+  System::death($world);
 }
 
 void GUI::resize_map(int new_size) {

map.hpp

@@ -57,6 +57,7 @@ public:
   int limit() { return $limit; }
   size_t width() { return $walls[0].size(); }
   size_t height() { return $walls.size(); }
+  int distance(Point to) { return $paths[to.y][to.x]; }
   Room &room(size_t at) {
     return $rooms[at];
   }

meson.build

@@ -32,6 +32,7 @@ roguish = executable('roguish', [
   'gui.cpp',
   'rand.cpp',
   'collider.cpp',
+  'combat.cpp',
   'systems.cpp',
   ],
   dependencies: dependencies)

status.txt

@@ -10,7 +10,9 @@ TODO:
 * Write a test that generates a ton of maps then confirms there's a path from one room to every other room?
 * Lua integration?
 
-* Combat system and simple loot system.
+* BUG: If map is < 90 zome out crashes.
+
+* Simple loot system.
 * Actually render FTXUI ansi output instead of the gui.cpp hack.
 * Remove entity from world, _or_ mark them dead, switch their icon, and make them an entity the player walks over?
 * Bring back sounds, check out SoLoud.

systems.cpp

@@ -10,6 +10,8 @@ using namespace fmt;
 
 using namespace Components;
 
+#define HEARING_DISTANCE 8
+
 void System::enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player) {
   const auto &player_position = world.component<Position>(player.entity);
   game_map.set_target(player_position.location);
@@ -17,10 +19,12 @@ void System::enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player
 
   world.system<Position, Motion>([&](const auto &ent, auto &position, auto &motion) {
     if(ent != player.entity) {
-      Point out = position.location;
+      Point out = position.location; // copy
+      if(game_map.distance(out) < HEARING_DISTANCE) {
         game_map.neighbors(out, false);
         motion = { int(out.x - position.location.x), int(out.y - position.location.y)};
       }
+    }
   });
   game_map.clear_target(player_position.location);
 }
@@ -64,6 +68,22 @@ void System::motion(DinkyECS::World &world, Map &game_map) {
   });
 }
 
+void System::death(DinkyECS::World &world) {
+  auto &collider = world.get<spatial_map>();
+
+  world.system<Position, Combat>([&](const auto &ent, auto &position, auto &combat) {
+    // bring out yer dead
+    if(combat.hp <= 0 && !combat.dead) {
+      combat.dead = true;
+      // take them out of collision map
+      collider.remove(position.location);
+
+      // remove their motion so they're dead
+      world.remove<Motion>(ent);
+    }
+  });
+}
+
 
 void System::combat(DinkyECS::World &world, Player &player) {
   auto& collider = world.get<spatial_map>();
@@ -77,25 +97,24 @@ void System::combat(DinkyECS::World &world, Player &player) {
   if(found) {
     for(auto entity : nearby) {
       auto& enemy_combat = world.component<Combat>(entity);
-      int player_dmg = Random::uniform<int>(1, enemy_combat.damage);
-      enemy_combat.hp -= player_dmg;
-      log.log(format("YOU HIT {} damage! Enemy has {} HP left.",
-            player_dmg, enemy_combat.hp));
+      int player_dmg = player_combat.fight(enemy_combat);
 
-      if(enemy_combat.hp <= 0) {
-        log.log("--- ENEMY DEAD!---");
-        auto enemy_position = world.component<Position>(entity);
-        collider.remove(enemy_position.location);
-        world.remove<Motion>(entity);
+      if(player_dmg > 0) {
+        log.log(format("You HIT for {} damage, HP left {}.", player_dmg, enemy_combat.hp));
       } else {
-        int attack = Random::uniform<int>(0,1);
-        if(attack) {
-          int dmg = Random::uniform<int>(1, enemy_combat.damage);
-          player_combat.hp -= dmg;
-          log.log(format("HIT! You took {} damage.", dmg));
-        } else {
-          log.log("You dodged! Run!");
+        log.log("You missed! They're quick!");
       }
+
+      if(enemy_combat.hp > 0) {
+        int enemy_dmg = enemy_combat.fight(player_combat);
+
+        if(enemy_dmg > 0) {
+          log.log(format("Enemy HIT YOU for {} damage.", enemy_dmg));
+        } else {
+          log.log("Enemy MISSED, you dodged it.");
+        }
+      } else {
+        log.log("ENEMY DEAD! YOU WIN!");
       }
     }
   }

systems.hpp

@@ -9,6 +9,7 @@ using namespace Components;
 namespace System {
   void motion(DinkyECS::World &world, Map &game_map);
   void combat(DinkyECS::World &world, Player &player);
+  void death(DinkyECS::World &world);
   void enemy_pathing(DinkyECS::World &world, Map &game_map, Player &player);
   void draw_map(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, size_t view_x, size_t view_y);
   void draw_entities(DinkyECS::World &world, Map &game_map, ftxui::Canvas &canvas, const Point &cam_orig, size_t view_x, size_t view_y);