Adding example of completely custom help option

examples/CMakeLists.txt

@@ -20,5 +20,6 @@ add_cli_exe(groups groups.cpp)
 add_cli_exe(inter_argument_order inter_argument_order.cpp)
 add_cli_exe(prefix_command prefix_command.cpp)
 add_cli_exe(enum enum.cpp)
+add_cli_exe(modhelp modhelp.cpp)
 
 add_subdirectory(subcom_in_files)

examples/modhelp.cpp

@@ -0,0 +1,31 @@
+// Modify the help print so that argument values are accessible 
+// Note that this will not shortcut `->required` and other similar options
+
+#include "CLI/CLI.hpp"
+
+#include <iostream>
+
+int main(int argc, char **argv) {
+  CLI::App test;
+
+  // Remove help flag because it shortcuts all processing
+  test.set_help_flag();
+
+  // Add custom flag that activates help
+  auto help = test.add_flag("-h,--help", "Request help");
+
+  std::string some_option;
+  test.add_option("-a", some_option, "Some description");
+
+  try {
+    test.parse(argc, argv);
+    if(*help)
+        throw CLI::CallForHelp();
+  } catch (const CLI::Error &e) {
+    std::cout << "Option string:" << some_option << std::endl;
+    return test.exit(e);
+  }
+
+  std::cout << "Option string:" << some_option << std::endl;
+  return 0;
+}