Added cxxopts external dependency

apps/ExampleApp/CMakeLists.txt

@@ -1,4 +1,7 @@
-add_executable(ExampleApp main.cpp)
+configure_file(main.cpp main.cpp)
 
-target_include_directories(ExampleApp PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-target_link_libraries(ExampleApp ExampleLib)
+add_executable(ExampleApp "${CMAKE_CURRENT_BINARY_DIR}/main.cpp")
+
+target_include_directories(ExampleApp PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(ExampleApp ExampleLib cxxopts)

apps/ExampleApp/main.cpp

@@ -1,6 +1,36 @@
 #include "ExampleLib/ExampleLib.h"
 
-int main() {
+#include "cxxopts.hpp"
+
+int main(int argc, char **argv) {
+    cxxopts::Options options(
+        "ExampleApp", "ExampleApp: example application for the templo template repository (Version: ${GIT_VERSION})");
+
+    // clang-format off
+    options.add_options()
+        ("h,help", "Print usage message")
+    ;
+    // clang-format on
+
+    try {
+        auto result = options.parse(argc, argv);
+
+        if (result.count("help")) {
+            std::cout << options.help() << std::endl;
+            std::exit(0);
+        }
+    } catch (const cxxopts::option_not_exists_exception &e) {
+        std::cerr << "ERROR: " << e.what() << std::endl;
+        std::cout << std::endl;
+        std::cout << options.help() << std::endl;
+        std::exit(1);
+    } catch (const std::exception &e) {
+        std::cerr << "ERROR: " << e.what() << std::endl;
+        std::cout << std::endl;
+        std::cout << options.help() << std::endl;
+        std::exit(1);
+    }
+
     PrintMessage("Hello world");
 
     return 0;

config/cmake/external/cxxopts.cmake

@@ -0,0 +1,19 @@
+include(FetchContent)
+FetchContent_Declare(
+  cxxopts-external
+  GIT_REPOSITORY https://github.com/jarro2783/cxxopts.git
+  GIT_TAG v2.2.1)
+
+set(FETCHCONTENT_QUIET OFF)
+
+option(CXXOPTS_BUILD_EXAMPLES "Set to ON to build examples" ON)
+option(CXXOPTS_BUILD_TESTS "Set to ON to build tests" ON)
+
+set(CXXOPTS_BUILD_EXAMPLES OFF)
+set(CXXOPTS_BUILD_TESTS OFF)
+
+FetchContent_MakeAvailable(cxxopts-external)
+
+get_target_property(cxxopts_include_dirs cxxopts INTERFACE_INCLUDE_DIRECTORIES)
+set_target_properties(cxxopts PROPERTIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+                                         "${cxxopts_include_dirs}")

config/cmake/external/external.cmake

@@ -1 +1,2 @@
 include("${CMAKE_SOURCE_DIR}/config/cmake/external/gtest.cmake")
+include("${CMAKE_SOURCE_DIR}/config/cmake/external/cxxopts.cmake")