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

libs/cli11/tests/app_helper.hpp

@@ -0,0 +1,67 @@
+// Copyright (c) 2017-2021, 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
+
+#pragma once
+
+#ifdef CLI11_SINGLE_FILE
+#include "CLI11.hpp"
+#else
+#include "CLI/CLI.hpp"
+#endif
+
+#include "catch.hpp"
+#include <iostream>
+#include <string>
+#include <utility>
+#include <vector>
+
+using input_t = std::vector<std::string>;
+
+class TApp {
+  public:
+    CLI::App app{"My Test Program"};
+    input_t args{};
+    virtual ~TApp() = default;
+    void run() {
+        // It is okay to re-parse - clear is called automatically before a parse.
+        input_t newargs = args;
+        std::reverse(std::begin(newargs), std::end(newargs));
+        app.parse(newargs);
+    }
+};
+
+class TempFile {
+    std::string _name{};
+
+  public:
+    explicit TempFile(std::string name) : _name(std::move(name)) {
+        if(!CLI::NonexistentPath(_name).empty())
+            throw std::runtime_error(_name);
+    }
+
+    ~TempFile() {
+        std::remove(_name.c_str());  // Doesn't matter if returns 0 or not
+    }
+
+    operator const std::string &() const { return _name; }  // NOLINT(google-explicit-constructor)
+    CLI11_NODISCARD const char *c_str() const { return _name.c_str(); }
+};
+
+inline void put_env(std::string name, std::string value) {
+#ifdef _WIN32
+    _putenv_s(name.c_str(), value.c_str());
+#else
+    setenv(name.c_str(), value.c_str(), 1);
+#endif
+}
+
+inline void unset_env(std::string name) {
+#ifdef _WIN32
+    _putenv_s(name.c_str(), "");
+#else
+    unsetenv(name.c_str());
+#endif
+}