Parse ssh port for remote connections

Caching this will be done in a later commit.

src/Util/util.cpp

@@ -93,4 +93,20 @@ std::string get_username() {
 	return {};
 #endif
 }
+
+int get_port() {
+	const auto env = std::getenv("SSH_CONNECTION");
+	if (env) {
+		std::string ssh_connection {env};
+		const auto n = ssh_connection.rfind(' ');
+		if (n != std::string::npos) {
+			try {
+				return std::stoi(ssh_connection.substr(n + 1));
+			} catch (std::invalid_argument const &) {
+				std::cerr << "Failed to parse port number " << ssh_connection << std::endl;
+			}
+		}
+	}
+	return -1;
+}
 }

src/Util/util.hpp

@@ -16,4 +16,5 @@ const char *home_dir();
 std::string pwd();
 bool get_local_domain(std::string &result);
 std::string get_username();
+int get_port();
 }

src/path.cpp

@@ -35,7 +35,7 @@ QUrl Path::get_url() const {
 			res.setScheme("sftp");
 			res.setUserName(QString::fromStdString(Util::get_username()));
 			res.setHost(QString::fromStdString(host));
-			// TODO: Consider supporting custom ports, e.g. parse $SSH_CLIENT
+			res.setPort(Util::get_port());
 		} else {
 			std::cerr << "Failed deducing remote prefix" << std::endl;
 		}