Merge commit '147125babfc18abf586237344d6dab5a4bd1e79f' as 'libs/cli11'

libs/cli11/examples/modhelp.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) 2017-2022, University of Cincinnati, developed by Henry Schreiner
+// under NSF AWARD 1414736 and by the respective contributors.
+// All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <CLI/CLI.hpp>
+#include <iostream>
+#include <string>
+
+int main(int argc, char **argv) {
+    CLI::App test{R"raw(Modify the help print so that argument values are accessible.
+Note that this will not shortcut `->required` and other similar options.)raw"};
+
+    // 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 -a string in help: " << some_option << std::endl;
+        return test.exit(e);
+    }
+
+    std::cout << "Option -a string: " << some_option << std::endl;
+    return 0;
+}