chore: improve config file

Signed-off-by: ComixHe <[email protected]>

Author: ComixHe

CMakeLists.txt

@@ -40,13 +40,15 @@ if(OCPPI_USE_VENDOR_ALL)
 
 endif()
 
+set(TL_EXPECTED_MINIMAL_VERSION 1.0.0)
+
 if(OCPPI_USE_VENDOR_EXPECTED)
   add_subdirectory(external/expected EXCLUDE_FROM_ALL)
   set_target_properties(expected PROPERTIES EXPECTED_BUILD_TESTS OFF)
 else()
   CPMFindPackage(
     NAME expected
-    VERSION 1.0.0
+    VERSION ${TL_EXPECTED_MINIMAL_VERSION}
     GITHUB_REPOSITORY TartanLlama/expected
     GIT_TAG v1.1.0
     GIT_SHALLOW ON
@@ -68,13 +70,15 @@ else()
     EXCLUDE_FROM_ALL ON)
 endif()
 
+set(JSON_MINIMAL_VERSION 3.11.2)
+
 if(OCPPI_USE_VENDOR_JSON)
   set(JSON_Install ON)
   add_subdirectory(external/json EXCLUDE_FROM_ALL)
 else()
   CPMFindPackage(
     NAME nlohmann_json
-    VERSION 3.11.2
+    VERSION ${JSON_MINIMAL_VERSION}
     URL "https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz"
     EXCLUDE_FROM_ALL ON
     OPTIONS "JSON_Install ON")

misc/cmake/ocppi-config.cmake.in

@@ -4,9 +4,14 @@ list(APPEND CMAKE_MODULE_PATH "@PACKAGE_cmakeModulesDir@")
 
 include(CMakeFindDependencyMacro)
 
-find_dependency(Boost 1.74.0 COMPONENTS headers)
-find_dependency(spdlog 1.10.0)
-find_dependency(tl-expected 1.0.0)
-find_dependency(nlohmann_json 3.11.2)
+set(OCPPI_USE_VENDOR_EXPECTED @OCPPI_USE_VENDOR_EXPECTED@)
+if(NOT OCPPI_USE_VENDOR_EXPECTED)
+  find_dependency(tl-expected @TL_EXPECTED_MINIMAL_VERSION@)
+endif()
+
+set(OCPPI_USE_VENDOR_JSON @OCPPI_USE_VENDOR_JSON@)
+if(NOT OCPPI_USE_VENDOR_JSON)
+  find_dependency(nlohmann_json @JSON_MINIMAL_VERSION@)
+endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/ocppi.cmake)