Clarifies path to 'build' dir

Also, sorts those gitignores.

.gitignore

@@ -1,12 +1,13 @@
-CMakeLists.txt.user
 CMakeCache.txt
 CMakeFiles
+CMakeLists.txt.user
 CMakeScripts
-Testing
+CMakeUserPresets.json
-Makefile
-cmake_install.cmake
-install_manifest.txt
-compile_commands.json
 CTestTestfile.cmake
+Makefile
+Testing
 _deps
 build
+cmake_install.cmake
+compile_commands.json
+install_manifest.txt

CMakeLists.txt

@@ -1,7 +1,11 @@
 cmake_minimum_required(VERSION 3.24.2)
-set (CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11)
 
-project (cppchallenge)
+project(cppchallenge)
-set (CMAKE_RUNTIME_OUTPUT_DIRECTORY "build")
+find_package(CLI11 REQUIRED)
+set(BUILD_DIR "${PROJECT_SOURCE_DIR}/build")
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${BUILD_DIR})
+set(CLI11_DIR ${BUILD_DIR})
 file(GLOB SOURCES "src/*.cpp")
-add_executable(cppchallenge ${SOURCES})
+add_executable(${PROJECT_NAME} ${SOURCES})
+target_link_libraries(${PROJECT_NAME} CLI11::CLI11)

conanfile.txt

@@ -0,0 +1,7 @@
+[requires]
+cli11/2.3.2
+
+[generators]
+CMakeDeps
+CMakeToolchain
+

cppchallenge.cpp

@@ -0,0 +1,11 @@
+#include "CLI/CLI.hpp"
+#include <iostream>
+
+int main(int argc, char *argv[]){
+   CLI::App app{"Just a simple 'hello'"};
+   CLI11_PARSE(app, argc, argv);
+   std::cout << "Hello World!" << std::endl;
+   return 0;
+}
+
+//  vim: set ts=4 expandtab :

src/cppchallenge.cpp

@@ -1,6 +1,9 @@
-#include<iostream>
+#include "CLI/CLI.hpp"
+#include <iostream>
 
 int main(int argc, char *argv[]){
+   CLI::App app{"Just a simple 'hello'"};
+   CLI11_PARSE(app, argc, argv);
    std::cout << "Hello World!" << std::endl;
    return 0;
 }