Finish project setup

CMakeLists.txt

@@ -3,5 +3,27 @@ project(AdventOfCode2025)
 
 set(CMAKE_CXX_STANDARD 20)
 
-#### Exe to make sure cmake is working
+set(INPUT_DIR "input")
+
+##### SETUP COMPILE COMMANDS #####
+
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    set(CMAKE_EXPORT_COMPILE_COMMANDS on)
+endif()
+
+# Copy the compile commands to the build/ dir, not entirely sure why, but my particular version of clangd is just ignoring its config file.
+
+if(EXISTS "${CMAKE_BINARY_DIR}/compile_commands.json")
+    IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        FILE(COPY "${CMAKE_BINARY_DIR}/compile_commands.json" DESTINATION "${CMAKE_BINARY_DIR}/../")
+    ENDIF()
+ENDIF()
+
+### Copy the input files dir to build
+file(COPY ${INPUT_DIR} DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
+
+
+### EXECUTABLES
+
+# Exe to make sure cmake is working
 add_executable(testcmake src/testcmake/main.cpp)