Squashed 'libs/cli11/' content from commit dcbcb47

git-subtree-dir: libs/cli11
git-subtree-split: dcbcb4721dda5dab0a56d9faaaee50e6a30f7758

examples/nested.cpp

@@ -0,0 +1,30 @@
+// 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 <string>
+
+int main(int argc, char **argv) {
+
+    CLI::App app("Vision Application");
+    app.set_help_all_flag("--help-all", "Expand all help");
+    app.add_flag("--version", "Get version");
+
+    CLI::App *cameraApp = app.add_subcommand("camera", "Configure the app camera");
+    cameraApp->require_subcommand(0, 1);  // 0 (default) or 1 camera
+
+    std::string mvcamera_config_file = "mvcamera_config.json";
+    CLI::App *mvcameraApp = cameraApp->add_subcommand("mvcamera", "MatrixVision Camera Configuration");
+    mvcameraApp->add_option("-c,--config", mvcamera_config_file, "Config filename")
+        ->capture_default_str()
+        ->check(CLI::ExistingFile);
+
+    std::string mock_camera_path;
+    CLI::App *mockcameraApp = cameraApp->add_subcommand("mock", "Mock Camera Configuration");
+    mockcameraApp->add_option("-p,--path", mock_camera_path, "Path")->required()->check(CLI::ExistingPath);
+
+    CLI11_PARSE(app, argc, argv);
+}