Update Makefile, some fixes

.clang-format

@@ -0,0 +1,4 @@
+---
+BasedOnStyle: Google
+
+...

.gitignore

@@ -0,0 +1,3 @@
+*.o
+build
+sfml-app

CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 2.8...3.13)
+project(boids)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -Wall")
+set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake_modules" ${CMAKE_MODULE_PATH})
+
+find_package(SFML 2 REQUIRED system window graphics network audio)
+find_package(TGUI 0.10 REQUIRED)
+
+if(NOT SFML_FOUND)
+    message(FATAL_ERROR "Could not find SFML")
+endif()
+
+if(NOT TGUI_FOUND)
+    message(FATAL_ERROR "Could not find TGUI")
+endif()
+set(CMAKE_VERBOSE_MAKEFILE ON)
+file(GLOB SRCS *.cpp )
+
+add_executable(${PROJECT_NAME} ${SRCS})
+target_link_libraries(${PROJECT_NAME} tgui sfml-system sfml-window sfml-graphics sfml-network sfml-audio)
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/arrow.png
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})

Makefile

@@ -1,17 +1,17 @@
-all: sfml-app
-	./sfml-app
+EXEC = sfml-app
+CC = g++
+CFLAGS = -std=c++17 -c -Wall
+LDFLAGS = -std=c++17 -o $(EXEC) -ltgui -lsfml-graphics -lsfml-window -lsfml-audio -lsfml-system
+SRCS = $(wildcard *.cpp)
+OBJS = $(SRCS:.cpp=.o)
 
-sfml-app: $(F2) Vector2.o Boids.o
-	g++ -std=c++17 $(F2) Vector2.o Boids.o -o sfml-app -ltgui -lsfml-graphics -lsfml-window -lsfml-audio -lsfml-system
+all: $(EXEC)
 
-Vector2.o : Vector2.cpp Vector2.h;
-	g++ -std=c++17 -c Vector2.cpp
+$(EXEC): $(OBJS)
+	$(CC) $^ $(LDFLAGS)
 
-Boids.o : Boids.cpp Boids.h
-		g++ -std=c++17 -c Boids.cpp
-
-$(F2) : Vector2.h $(F1) Boids.h
-		g++ -std=c++17 -c $(F1)
+%.o: %.cpp
+	$(CC) $(CFLAGS) $< -o $@
 
 clean:
-	rm -rf *o sfml-app
+	$(RM) -rf *o $(EXEC)