Move test applications to src/apps/

The cam and qcam test application share code, currently through a crude
hack that references the cam source files directly from the qcam
meson.build file. To prepare for the introduction of hosting that code
in a static library, move all applications to src/apps/.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/apps/lc-compliance/main.cpp

@@ -0,0 +1,193 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ * Copyright (C) 2021, Collabora Ltd.
+ *
+ * main.cpp - lc-compliance - The libcamera compliance tool
+ */
+
+#include <iomanip>
+#include <iostream>
+#include <string.h>
+
+#include <gtest/gtest.h>
+
+#include <libcamera/libcamera.h>
+
+#include "environment.h"
+#include "../cam/options.h"
+
+using namespace libcamera;
+
+enum {
+	OptCamera = 'c',
+	OptList = 'l',
+	OptFilter = 'f',
+	OptHelp = 'h',
+};
+
+/*
+ * Make asserts act like exceptions, otherwise they only fail (or skip) the
+ * current function. From gtest documentation:
+ * https://google.github.io/googletest/advanced.html#asserting-on-subroutines-with-an-exception
+ */
+class ThrowListener : public testing::EmptyTestEventListener
+{
+	void OnTestPartResult(const testing::TestPartResult &result) override
+	{
+		if (result.type() == testing::TestPartResult::kFatalFailure ||
+		    result.type() == testing::TestPartResult::kSkip)
+			throw testing::AssertionException(result);
+	}
+};
+
+static void listCameras(CameraManager *cm)
+{
+	for (const std::shared_ptr<Camera> &cam : cm->cameras())
+		std::cout << "- " << cam.get()->id() << std::endl;
+}
+
+static int initCamera(CameraManager *cm, OptionsParser::Options options)
+{
+	std::shared_ptr<Camera> camera;
+
+	int ret = cm->start();
+	if (ret) {
+		std::cout << "Failed to start camera manager: "
+			  << strerror(-ret) << std::endl;
+		return ret;
+	}
+
+	if (!options.isSet(OptCamera)) {
+		std::cout << "No camera specified, available cameras:" << std::endl;
+		listCameras(cm);
+		return -ENODEV;
+	}
+
+	const std::string &cameraId = options[OptCamera];
+	camera = cm->get(cameraId);
+	if (!camera) {
+		std::cout << "Camera " << cameraId << " not found, available cameras:" << std::endl;
+		listCameras(cm);
+		return -ENODEV;
+	}
+
+	Environment::get()->setup(cm, cameraId);
+
+	std::cout << "Using camera " << cameraId << std::endl;
+
+	return 0;
+}
+
+static int initGtestParameters(char *arg0, OptionsParser::Options options)
+{
+	const std::map<std::string, std::string> gtestFlags = { { "list", "--gtest_list_tests" },
+								{ "filter", "--gtest_filter" } };
+
+	int argc = 0;
+	std::string filterParam;
+
+	/*
+	 * +2 to have space for both the 0th argument that is needed but not
+	 * used and the null at the end.
+	 */
+	char **argv = new char *[(gtestFlags.size() + 2)];
+	if (!argv)
+		return -ENOMEM;
+
+	argv[0] = arg0;
+	argc++;
+
+	if (options.isSet(OptList)) {
+		argv[argc] = const_cast<char *>(gtestFlags.at("list").c_str());
+		argc++;
+	}
+
+	if (options.isSet(OptFilter)) {
+		/*
+		 * The filter flag needs to be passed as a single parameter, in
+		 * the format --gtest_filter=filterStr
+		 */
+		filterParam = gtestFlags.at("filter") + "=" +
+			      static_cast<const std::string &>(options[OptFilter]);
+
+		argv[argc] = const_cast<char *>(filterParam.c_str());
+		argc++;
+	}
+
+	argv[argc] = nullptr;
+
+	::testing::InitGoogleTest(&argc, argv);
+
+	delete[] argv;
+
+	return 0;
+}
+
+static int initGtest(char *arg0, OptionsParser::Options options)
+{
+	int ret = initGtestParameters(arg0, options);
+	if (ret)
+		return ret;
+
+	testing::UnitTest::GetInstance()->listeners().Append(new ThrowListener);
+
+	return 0;
+}
+
+static int parseOptions(int argc, char **argv, OptionsParser::Options *options)
+{
+	OptionsParser parser;
+	parser.addOption(OptCamera, OptionString,
+			 "Specify which camera to operate on, by id", "camera",
+			 ArgumentRequired, "camera");
+	parser.addOption(OptList, OptionNone, "List all tests and exit", "list");
+	parser.addOption(OptFilter, OptionString,
+			 "Specify which tests to run", "filter",
+			 ArgumentRequired, "filter");
+	parser.addOption(OptHelp, OptionNone, "Display this help message",
+			 "help");
+
+	*options = parser.parse(argc, argv);
+	if (!options->valid())
+		return -EINVAL;
+
+	if (options->isSet(OptHelp)) {
+		parser.usage();
+		std::cerr << "Further options from Googletest can be passed as environment variables"
+			  << std::endl;
+		return -EINTR;
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	OptionsParser::Options options;
+	int ret = parseOptions(argc, argv, &options);
+	if (ret == -EINTR)
+		return EXIT_SUCCESS;
+	if (ret < 0)
+		return EXIT_FAILURE;
+
+	std::unique_ptr<CameraManager> cm = std::make_unique<CameraManager>();
+
+	/* No need to initialize the camera if we'll just list tests */
+	if (!options.isSet(OptList)) {
+		ret = initCamera(cm.get(), options);
+		if (ret)
+			return ret;
+	}
+
+	ret = initGtest(argv[0], options);
+	if (ret)
+		return ret;
+
+	ret = RUN_ALL_TESTS();
+
+	if (!options.isSet(OptList))
+		cm->stop();
+
+	return ret;
+}