GameEngine is now a state machine so I can push its design further and keep it solid.

builder.cpp

@@ -76,20 +76,22 @@ void Builder::building(BuildEvent ev) {
     int rc = pclose(build_out);
 
     if(rc == 0) {
+      game.event(GameEvent::BUILD_SUCCESS);
       gui.build_works();
     } else {
-      // BUG: make it not play two sounds
+      game.event(GameEvent::BUILD_FAILED);
       gui.build_failed(true, build_cmd);
     }
 
     build_out = NULL;
+    game.event(GameEvent::BUILD_DONE);
     state(DONE);
   } else {
     auto m = parse_line(line);
 
     if(m.match) {
       gui.output(format("HIT WITH {} @ {}:{}:{} {}", m.type, m.file_name, m.lnumber, m.col, m.message));
-      game.hit(m.type);
+      game.event(GameEvent::HIT);
     }
     state(READING);
   }
@@ -117,7 +119,7 @@ void Builder::start(BuildEvent ev) {
 
 void Builder::waiting(BuildEvent ev) {
   if(listener->changes) {
-    game.start_round();
+    game.event(GameEvent::BUILD_START);
     gui.building();
     gui.output(format("CHANGES! Running build {}", build_cmd));
     state(FORKING);
@@ -162,11 +164,8 @@ void Builder::reading(BuildEvent ev) {
 }
 
 void Builder::done(BuildEvent ev) {
-  game.end_round();
-
   if(game.is_dead()) {
     gui.you_died();
-    game.reset();
   }
 
   listener->reset_state();

fsm.hpp

@@ -5,15 +5,19 @@
 #define FSM_EV(S, F) case S: F(); break
 #define FSM_STATE(S, F, E) case S: F(E); break
 
+#define FSM_STATE_LOG(C, S, F, E) case C::S: fmt::println(">> " #C " " #S ":" #F " event={}, state={}", int(E), int(_state)); F(E); fmt::println("<< " #C " state={}", int(_state)); break
+
 template<typename S, typename E>
 class DeadSimpleFSM {
 protected:
+  // BUG: don't put this in your class because state() won't work
   S _state = S::START;
 
 public:
   virtual void event(E event) = 0;
 
   void state(S next_state) {
+    // fmt::println("STATE {}->{}", int(_state), int(next_state));
     _state = next_state;
   }
 

game_engine.cpp

@@ -4,6 +4,7 @@
 #include <fmt/core.h>
 #include <fmt/color.h>
 #include "game_engine.hpp"
+#include <cassert>
 
 const auto ERROR = fmt::emphasis::bold | fg(fmt::color::red);
 
@@ -23,18 +24,6 @@ int GameEngine::determine_damage(string &type) {
   }
 }
 
-void GameEngine::start_round() {
-  hits_taken = 0;
-}
-
-void GameEngine::end_round() {
-  ++rounds;
-  if(hits_taken == 0) {
-    ++streak;
-    heal();
-  }
-}
-
 void GameEngine::reset() {
   rounds = 0;
   streak = 0;
@@ -46,8 +35,6 @@ bool GameEngine::hit(string &type) {
   int damage = determine_damage(type);
   hit_points -= damage;
   ++hits_taken;
-  streak = 0;
-
   return is_dead();
 }
 
@@ -62,20 +49,52 @@ bool GameEngine::is_dead() {
 
 void GameEngine::start(GameEvent ev) {
   state(GameState::IDLE);
+  idle(ev);
 }
 
 void GameEngine::idle(GameEvent ev) {
-  state(GameState::IDLE);
+  if(ev == GameEvent::BUILD_START) {
+    hits_taken = 0;
+    state(GameState::IN_ROUND);
+  } else {
+    state(GameState::IDLE);
+  }
 }
 
 void GameEngine::in_round(GameEvent ev) {
-  state(GameState::IN_ROUND);
+  if(ev == GameEvent::HIT) {
+    string er_type = "error";
+    hit(er_type); // FIXME: bring back error type
+    if(is_dead()) {
+      state(GameState::DEAD);
+    } else {
+      state(GameState::IN_ROUND);
+    }
+  } else if(ev == GameEvent::BUILD_SUCCESS) {
+    state(GameState::SUCCESS);
+  } else if(ev == GameEvent::BUILD_FAILED) {
+    state(GameState::FAILURE);
+  } else {
+    state(GameState::IN_ROUND);
+  }
 }
 
 void GameEngine::dead(GameEvent ev) {
-  state(GameState::DEAD);
+  reset();
+  state(GameState::IDLE);
 }
 
-void GameEngine::alive(GameEvent ev) {
+void GameEngine::success(GameEvent ev) {
-  state(GameState::ALIVE);
+  assert(ev == GameEvent::BUILD_DONE && "success state expected BUILD_DONE");
+  ++rounds;
+  ++streak;
+  heal();
+  state(GameState::IDLE);
+}
+
+void GameEngine::failure(GameEvent ev) {
+  assert(ev == GameEvent::BUILD_DONE && "failure state expected BUILD_DONE");
+  ++rounds;
+  streak = 0;
+  state(GameState::IDLE);
 }

game_engine.hpp

@@ -9,16 +9,17 @@
 using std::string;
 
 enum class GameState {
-  START, IDLE, IN_ROUND, DEAD, ALIVE
+  START, IDLE, IN_ROUND, DEAD, SUCCESS, FAILURE
 };
 
 
 enum class GameEvent {
-  BUILD_START, BUILD_END,
+  BUILD_START, BUILD_SUCCESS,
-  HIT
+  BUILD_DONE, BUILD_FAILED, HIT
 };
 
 class GameEngine : DeadSimpleFSM<GameState, GameEvent> {
+
   std::map<string, int> damage_types{
     {"error", 4},
     {"warning", 1},
@@ -31,7 +32,6 @@ class GameEngine : DeadSimpleFSM<GameState, GameEvent> {
   int hits_taken = 0;
   int rounds = 0;
   int streak = 0;
-  GameState _state = GameState::START;
 
   GameEngine(int hp);
 
@@ -47,7 +47,8 @@ class GameEngine : DeadSimpleFSM<GameState, GameEvent> {
       FSM_STATE(GameState::IDLE, idle, ev);
       FSM_STATE(GameState::IN_ROUND, in_round, ev);
       FSM_STATE(GameState::DEAD, dead, ev);
-      FSM_STATE(GameState::ALIVE, alive, ev);
+      FSM_STATE(GameState::SUCCESS, success, ev);
+      FSM_STATE(GameState::FAILURE, failure, ev);
     }
   }
 
@@ -56,12 +57,10 @@ class GameEngine : DeadSimpleFSM<GameState, GameEvent> {
   void idle(GameEvent ev);
   void in_round(GameEvent ev);
   void dead(GameEvent ev);
-  void alive(GameEvent ev);
+  void success(GameEvent ev);
-
+  void failure(GameEvent ev);
 
   // current API that will die
-  void start_round();
-  void end_round();
   void heal();
   bool hit(string &type);
   void reset();

tests/game_engine.cpp

@@ -7,32 +7,11 @@ using namespace fmt;
 TEST_CASE("game engine can start and take hit", "[game_engine]") {
   // test fails on purpose right now
   GameEngine game{4};
-  std::string err{"error"};
+  REQUIRE(!game.is_dead() == true);
-  game.start_round();
-  game.hit(err);
-  game.end_round();
-  REQUIRE(game.is_dead() == true);
 }
 
 TEST_CASE("", "[game_engine]") {
   // test fails on purpose right now
   GameEngine game{100};
-  std::string err{"error"};
-
-  game.start_round();
-  game.hit(err);
-  game.end_round();
-
-  REQUIRE(game.hit_points < 100);
-  REQUIRE(game.rounds == 1);
-  REQUIRE(game.streak == 0);
-  REQUIRE(game.is_dead() == false);
-
-  game.start_round();
-  game.end_round();
-
-  REQUIRE(game.hit_points == 100);
-  REQUIRE(game.rounds == 2);
-  REQUIRE(game.streak == 1);
   REQUIRE(game.is_dead() == false);
 }