cam: Extract option parser to separate file

And turn it into an OptionsParser object.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/cam/main.cpp

@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * main.cpp - cam - The libcamera swiss army knife
+ */
+
+#include <iostream>
+#include <map>
+#include <string.h>
+
+#include <libcamera/libcamera.h>
+
+#include "options.h"
+
+using namespace libcamera;
+
+OptionsParser::Options options;
+
+enum {
+	OptCamera = 'c',
+	OptHelp = 'h',
+	OptList = 'l',
+};
+
+static int parseOptions(int argc, char *argv[])
+{
+	OptionsParser parser;
+
+	parser.addOption(OptCamera, "Specify which camera to operate on",
+			 "camera", OptionsParser::ArgumentRequired,
+			 "camera");
+	parser.addOption(OptHelp, "Display this help message", "help");
+	parser.addOption(OptList, "List all cameras", "list");
+
+	options = std::move(parser.parse(argc, argv));
+	if (!options.valid())
+		return -EINVAL;
+
+	if (argc == 1 || options.isSet(OptHelp)) {
+		parser.usage();
+		return 1;
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	int ret;
+
+	ret = parseOptions(argc, argv);
+	if (ret < 0)
+		return EXIT_FAILURE;
+
+	CameraManager *cm = CameraManager::instance();
+
+	ret = cm->start();
+	if (ret) {
+		std::cout << "Failed to start camera manager: "
+			  << strerror(-ret) << std::endl;
+		return EXIT_FAILURE;
+	}
+
+	if (options.isSet(OptList)) {
+		std::cout << "Available cameras:" << std::endl;
+		for (const std::shared_ptr<Camera> &camera : cm->cameras())
+			std::cout << "- " << camera->name() << std::endl;
+	}
+
+	if (options.isSet(OptCamera)) {
+		std::shared_ptr<Camera> cam = cm->get(options[OptCamera]);
+
+		if (cam) {
+			std::cout << "Using camera " << cam->name() << std::endl;
+		} else {
+			std::cout << "Camera " << options[OptCamera]
+				  << " not found" << std::endl;
+		}
+	}
+
+	cm->stop();
+
+	return 0;
+}