Prepare day01 2025

Change-Id: Id3c46f5f552db5a0ba200dedc1ea4e4434932982

cmake/Findctre.cmake

@@ -0,0 +1,74 @@
+if (DEFINED _FINDCTRE_INCLUDED)
+    unset(ctre_FOUND CACHE)
+    unset(ctre_DIR CACHE)
+    unset(ctre_INCLUDE_DIR CACHE)
+    unset(ctre_LIBRARIES CACHE)
+    unset(ctre_VERSION CACHE)
+    return()
+endif()
+set(_FINDCTRE_INCLUDED TRUE)
+
+find_package(ctre QUIET)
+
+if (NOT ctre_FOUND)
+    message(STATUS "ctre not found. Fetching via FetchContent...")
+
+    include(FetchContent)
+
+    find_program(GIT_EXECUTABLE git)
+    if (GIT_EXECUTABLE)
+        set(CTRE_FETCH_METHOD "GIT")
+    else()
+        set(CTRE_FETCH_METHOD "ZIP")
+    endif()
+
+    if (CTRE_FETCH_METHOD STREQUAL "GIT")
+        FetchContent_Declare(
+            ctre
+            GIT_REPOSITORY https://github.com/hanickadot/compile-time-regular-expressions.git
+            GIT_TAG        v3.10.0
+        )
+    else()
+        FetchContent_Declare(
+            ctre
+            URL https://github.com/hanickadot/compile-time-regular-expressions/archive/refs/tags/v3.10.0.zip
+        )
+    endif()
+
+    # Turn off BUILD_TESTING globally to prevent CTest from being included in CTRE
+    set(BUILD_TESTING OFF CACHE BOOL "Disable testing globally" FORCE)
+    # Set the CTRE_BUILD_TESTS option before including the CTRE library
+    set(CTRE_BUILD_TESTS OFF CACHE BOOL "Build ctre Tests" FORCE)
+    FetchContent_MakeAvailable(ctre)
+else()
+    message(STATUS "ctre found.")
+
+    # Ensure we have a usable target
+    if (NOT TARGET ctre::ctre)
+        if (TARGET ctre)
+            add_library(ctre::ctre ALIAS ctre)
+        else()
+            message(FATAL_ERROR "ctre was found, but no CMake target 'ctre' or 'ctre::ctre' exists.")
+        endif()
+    endif()
+
+    # Populate the standard variables
+    set(ctre_FOUND TRUE)
+    set(ctre_LIBRARIES ctre::ctre)
+    get_target_property(_ctre_inc ctre::ctre INTERFACE_INCLUDE_DIRECTORIES)
+    set(ctre_INCLUDE_DIR "${_ctre_inc}")
+endif()
+
+if (NOT TARGET ctre::ctre)
+    if (TARGET ctre)
+        add_library(ctre::ctre ALIAS ctre)
+    else()
+        message(FATAL_ERROR "Could not find or fetch ctre; no target ctre or ctre::ctre available")
+    endif()
+endif()
+
+set(ctre_FOUND        TRUE)
+set(ctre_LIBRARIES    ctre::ctre)
+set(ctre_VERSION      "${ctre_VERSION}")         # this comes from the ctre project
+get_target_property(_ctre_inc ctre::ctre INTERFACE_INCLUDE_DIRECTORIES)
+set(ctre_INCLUDE_DIR  "${_ctre_inc}")