added version output

Signed-off-by: Tolga Cakir <tolga@cevel.net>

README.md

@@ -120,6 +120,7 @@ Options:
   -o <output>        Output Path [default: /tmp/gchd.ts]
   -p <port>          Port for UDP streaming [default: 57384]
   -r <resolution>    Resolution of Input Source [default: 1080]
+  -v                 Print program version
   -P <pid-path>      PID path [default: /var/run/gchd.pid]
 ```
 

src/main.cpp

@@ -30,6 +30,7 @@ void help(std::string name) {
 		  << "  -o <output>        Output Path [default: /tmp/gchd.ts]" << std::endl
 		  << "  -p <port>          Port for UDP streaming [default: " << PORT_NUM << "]" << std::endl
 		  << "  -r <resolution>    Resolution of Input Source [default: 1080]" << std::endl
+		  << "  -v                 Print program version" << std::endl
 		  << "  -P <pid-path>      PID path [default: /var/run/gchd.pid]" << std::endl;
 }
 
@@ -45,6 +46,10 @@ void usage(std::string name, std::string optarg, std::string option, const std::
 	std::cerr << "Try '" << name << " -h' for more information." << std::endl;
 }
 
+void version(std::string name, std::string version) {
+	std::cerr << name << " " << version << std::endl;
+}
+
 int main(int argc, char *argv[]) {
 	// object for managing runtime information
 	Process process;
@@ -71,7 +76,7 @@ int main(int argc, char *argv[]) {
 	// handling command-line options
 	int opt;
 
-	while ((opt = getopt(argc, argv, ":c:f:hi:n:o:p:r:P:")) != -1) {
+	while ((opt = getopt(argc, argv, ":c:f:hi:n:o:p:r:vP:")) != -1) {
 		switch (opt) {
 			case 'c': {
 				if (std::string(optarg) == "yuv") {
@@ -149,6 +154,9 @@ int main(int argc, char *argv[]) {
 				usage(process.getName(), optarg, "-r", arguments);
 				return EXIT_FAILURE;
 			}
+			case 'v':
+				version(process.getName(), process.getVersion());
+				return EXIT_SUCCESS;
 			case 'P':
 				pid = std::string(optarg);
 				break;

src/process.cpp

@@ -16,6 +16,9 @@
 
 #include <process.hpp>
 
+// constants
+constexpr auto version = "0.1.0";
+
 std::atomic<bool> Process::isActive_;
 
 bool Process::isActive() {
@@ -72,6 +75,10 @@ void Process::destroyPid() {
 	}
 }
 
+std::string Process::getVersion() {
+	return version;
+}
+
 void Process::sigHandler(int sig) {
 	std::cerr << std::endl << "Stop signal received." << std::endl;
 

src/process.hpp

@@ -19,6 +19,7 @@ class Process {
 		void setName(std::string name);
 		int createPid(std::string pidPath);
 		void destroyPid();
+		std::string getVersion();
 		Process();
 		~Process();