settings manager: better default setting handling and updating config file and command line parsing

doc/README.txt

@@ -32,7 +32,8 @@ Controls:
 
 Configuration file:
 - An optional configuration file can be used. See minetest.conf.example.
-- Path to file can be passed as a parameter to the executable.
+- Path to file can be passed as a parameter to the executable:
+	--config <path-to-file>
 - If not given as a parameter, these are checked, in order:
 	../minetest.conf
 	../../minetest.conf

minetest.conf.example

@@ -7,8 +7,6 @@
 # By default, all the settings are commented and not functional.
 # Uncomment settings by removing the preceding #.
 
-#dedicated_server =
-
 # Client side stuff
 
 #wanted_fps = 30

src/exceptions.h

@@ -124,6 +124,14 @@ public:
 	{}
 };
 
+class CommandLineError : public BaseException
+{
+public:
+	CommandLineError(const char *s):
+		BaseException(s)
+	{}
+};
+
 /*
 	Some "old-style" interrupts:
 */

src/main.cpp

@@ -306,38 +306,36 @@ Settings g_settings;
 // Sets default settings
 void set_default_settings()
 {
-	g_settings.set("dedicated_server", "");
-
 	// Client stuff
-	g_settings.set("wanted_fps", "30");
-	g_settings.set("fps_max", "60");
-	g_settings.set("viewing_range_nodes_max", "300");
-	g_settings.set("viewing_range_nodes_min", "35");
-	g_settings.set("screenW", "");
-	g_settings.set("screenH", "");
-	g_settings.set("host_game", "");
-	g_settings.set("port", "");
-	g_settings.set("address", "");
-	g_settings.set("name", "");
-	g_settings.set("random_input", "false");
-	g_settings.set("client_delete_unused_sectors_timeout", "1200");
-	g_settings.set("max_block_send_distance", "8");
-	g_settings.set("max_block_generate_distance", "6");
+	g_settings.setDefault("wanted_fps", "30");
+	g_settings.setDefault("fps_max", "60");
+	g_settings.setDefault("viewing_range_nodes_max", "300");
+	g_settings.setDefault("viewing_range_nodes_min", "35");
+	g_settings.setDefault("screenW", "");
+	g_settings.setDefault("screenH", "");
+	g_settings.setDefault("host_game", "");
+	g_settings.setDefault("port", "");
+	g_settings.setDefault("address", "");
+	g_settings.setDefault("name", "");
+	g_settings.setDefault("random_input", "false");
+	g_settings.setDefault("client_delete_unused_sectors_timeout", "1200");
+	g_settings.setDefault("max_block_send_distance", "8");
+	g_settings.setDefault("max_block_generate_distance", "6");
 
 	// Server stuff
-	g_settings.set("creative_mode", "false");
-	g_settings.set("heightmap_blocksize", "32");
-	g_settings.set("height_randmax", "constant 50.0");
-	g_settings.set("height_randfactor", "constant 0.6");
-	g_settings.set("height_base", "linear 0 0 0");
-	g_settings.set("plants_amount", "1.0");
-	g_settings.set("ravines_amount", "1.0");
-	g_settings.set("objectdata_interval", "0.2");
-	g_settings.set("active_object_range", "2");
-	g_settings.set("max_simultaneous_block_sends_per_client", "1");
-	g_settings.set("max_simultaneous_block_sends_server_total", "4");
-	g_settings.set("disable_water_climb", "true");
-	g_settings.set("endless_water", "true");
+	g_settings.setDefault("creative_mode", "false");
+	g_settings.setDefault("heightmap_blocksize", "32");
+	g_settings.setDefault("height_randmax", "constant 50.0");
+	g_settings.setDefault("height_randfactor", "constant 0.6");
+	g_settings.setDefault("height_base", "linear 0 0 0");
+	g_settings.setDefault("plants_amount", "1.0");
+	g_settings.setDefault("ravines_amount", "1.0");
+	g_settings.setDefault("objectdata_interval", "0.2");
+	g_settings.setDefault("active_object_range", "2");
+	g_settings.setDefault("max_simultaneous_block_sends_per_client", "1");
+	g_settings.setDefault("max_simultaneous_block_sends_server_total", "4");
+	g_settings.setDefault("disable_water_climb", "true");
+	g_settings.setDefault("endless_water", "true");
 }
 
 /*
@@ -962,6 +960,51 @@ int main(int argc, char *argv[])
 	try
 	{
 	
+	/*
+		Parse command line
+		TODO
+	*/
+	
+	core::map<std::string, ValueSpec> allowed_options;
+	allowed_options.insert("help", ValueSpec(VALUETYPE_FLAG));
+	allowed_options.insert("server", ValueSpec(VALUETYPE_FLAG,
+			"Run server directly"));
+	allowed_options.insert("config", ValueSpec(VALUETYPE_STRING,
+			"Load configuration from specified file"));
+	allowed_options.insert("port", ValueSpec(VALUETYPE_STRING));
+
+	Settings cmd_args;
+	
+	bool ret = cmd_args.parseCommandLine(argc, argv, allowed_options);
+
+	if(ret == false || cmd_args.getFlag("help"))
+	{
+		dstream<<"Allowed options:"<<std::endl;
+		for(core::map<std::string, ValueSpec>::Iterator
+				i = allowed_options.getIterator();
+				i.atEnd() == false; i++)
+		{
+			dstream<<"  --"<<i.getNode()->getKey();
+			if(i.getNode()->getValue().type == VALUETYPE_FLAG)
+			{
+			}
+			else
+			{
+				dstream<<" <value>";
+			}
+			dstream<<std::endl;
+
+			if(i.getNode()->getValue().help != NULL)
+			{
+				dstream<<"      "<<i.getNode()->getValue().help
+						<<std::endl;
+			}
+		}
+
+		return cmd_args.getFlag("help") ? 0 : 1;
+	}
+
+
 	/*
 		Basic initialization
 	*/
@@ -999,11 +1042,23 @@ int main(int argc, char *argv[])
 		Initialization
 	*/
 
-	// Read config file
+	/*
+		Read config file
+	*/
 	
-	if(argc >= 2)
+	// Path of configuration file in use
+	std::string configpath = "";
+	
+	if(cmd_args.exists("config"))
 	{
-		g_settings.readConfigFile(argv[1]);
+		bool r = g_settings.readConfigFile(cmd_args.get("config").c_str());
+		if(r == false)
+		{
+			dstream<<"Could not read configuration from \""
+					<<cmd_args.get("config")<<"\""<<std::endl;
+			return 1;
+		}
+		configpath = cmd_args.get("config");
 	}
 	else
 	{
@@ -1017,9 +1072,12 @@ int main(int argc, char *argv[])
 		{
 			bool r = g_settings.readConfigFile(filenames[i]);
 			if(r)
+			{
+				configpath = filenames[i];
 				break;
 			}
 		}
+	}
 
 	// Initialize random seed
 	srand(time(0));
@@ -1059,16 +1117,19 @@ int main(int argc, char *argv[])
 	std::cout<<std::endl;
 	char templine[100];
 	
-	// Dedicated?
-	bool dedicated = g_settings.getBoolAsk
-			("dedicated_server", "Dedicated server?", false);
-	std::cout<<"dedicated = "<<dedicated<<std::endl;
-	
 	// Port?
-	u16 port = g_settings.getU16Ask("port", "Port", 30000);
+	u16 port = 30000;
+	if(cmd_args.exists("port"))
+	{
+		port = cmd_args.getU16("port");
+	}
+	else
+	{
+		port = g_settings.getU16Ask("port", "Port", 30000);
 		std::cout<<"-> "<<port<<std::endl;
+	}
 	
-	if(dedicated)
+	if(cmd_args.getFlag("server"))
 	{
 		DSTACK("Dedicated server branch");
 		
@@ -2208,7 +2269,8 @@ int main(int argc, char *argv[])
 		
 		{
 		TimeTaker timer("beginScene", device);
-		driver->beginScene(true, true, bgcolor);
+		//driver->beginScene(true, true, bgcolor);
+		driver->beginScene(false, true, bgcolor);
 		beginscenetime = timer.stop(true);
 		}
 
@@ -2307,6 +2369,14 @@ int main(int argc, char *argv[])
 	*/
 	device->drop();
 	
+	/*
+		Update configuration file
+	*/
+	if(configpath != "")
+	{
+		g_settings.updateConfigFile(configpath.c_str());
+	}
+
 	} //try
 	catch(con::PeerNotFoundException &e)
 	{

src/socket.cpp

@@ -205,7 +205,7 @@ void UDPSocket::Send(const Address & destination, const void * data, int size)
 		destination.print();
 		dstream<<", size="<<size<<", data=";
 		for(int i=0; i<size && i<20; i++){
-			if(i%2==0) printf(" ");
+			if(i%2==0) DEBUGPRINT(" ");
 			DEBUGPRINT("%.2X", ((int)((const char*)data)[i])&0xff);
 		}
 		if(size>20)
@@ -267,7 +267,7 @@ int UDPSocket::Receive(Address & sender, void * data, int size)
 		//dstream<<", received="<<received<<std::endl;
 		dstream<<", size="<<received<<", data=";
 		for(int i=0; i<received && i<20; i++){
-			if(i%2==0) printf(" ");
+			if(i%2==0) DEBUGPRINT(" ");
 			DEBUGPRINT("%.2X", ((int)((const char*)data)[i])&0xff);
 		}
 		if(received>20)

src/test.cpp

@@ -1070,8 +1070,8 @@ struct TestConnection
 
 			dstream<<"Sending data (size="<<1100<<"):";
 			for(int i=0; i<1100 && i<20; i++){
-				if(i%2==0) printf(" ");
-				printf("%.2X", ((int)((const char*)*data1)[i])&0xff);
+				if(i%2==0) DEBUGPRINT(" ");
+				DEBUGPRINT("%.2X", ((int)((const char*)*data1)[i])&0xff);
 			}
 			if(1100>20)
 				dstream<<"...";
@@ -1091,8 +1091,8 @@ struct TestConnection
 
 			dstream<<"Received data (size="<<size<<"):";
 			for(int i=0; i<size && i<20; i++){
-				if(i%2==0) printf(" ");
-				printf("%.2X", ((int)((const char*)recvdata)[i])&0xff);
+				if(i%2==0) DEBUGPRINT(" ");
+				DEBUGPRINT("%.2X", ((int)((const char*)recvdata)[i])&0xff);
 			}
 			if(size>20)
 				dstream<<"...";

src/utility.h

@@ -668,6 +668,23 @@ inline s32 stoi(std::string s)
 	Config stuff
 */
 
+enum ValueType
+{
+	VALUETYPE_STRING,
+	VALUETYPE_FLAG // Doesn't take any arguments
+};
+
+struct ValueSpec
+{
+	ValueSpec(ValueType a_type, const char *a_help=NULL)
+	{
+		type = a_type;
+		help = a_help;
+	}
+	ValueType type;
+	const char *help;
+};
+
 class Settings
 {
 public:
@@ -710,36 +727,255 @@ public:
 		return true;
 	}
 
-	// Returns true on success
+	/*
+		Read configuration file
+
+		Returns true on success
+	*/
 	bool readConfigFile(const char *filename)
 	{
 		std::ifstream is(filename);
 		if(is.good() == false)
 		{
-			dstream<<"Error opening configuration file: "
-					<<filename<<std::endl;
+			dstream<<"Error opening configuration file \""
+					<<filename<<"\""<<std::endl;
 			return false;
 		}
 
-		dstream<<"Parsing configuration file: "
-				<<filename<<std::endl;
+		dstream<<"Parsing configuration file: \""
+				<<filename<<"\""<<std::endl;
 				
 		while(parseConfigObject(is));
 		
 		return true;
 	}
 
+	/*
+		Reads a configuration object from stream (usually a single line)
+		and adds it to dst.
+		
+		Preserves comments and empty lines.
+
+		Settings that were added to dst are also added to updated.
+		key of updated is setting name, value of updated is dummy.
+
+		Returns false on EOF
+	*/
+	bool getUpdatedConfigObject(std::istream &is,
+			core::list<std::string> &dst,
+			core::map<std::string, bool> &updated)
+	{
+		if(is.eof())
+			return false;
+		
+		// NOTE: This function will be expanded to allow multi-line settings
+		std::string line;
+		std::getline(is, line);
+
+		std::string trimmedline = trim(line);
+
+		std::string line_end = "";
+		if(is.eof() == false)
+			line_end = "\n";
+		
+		// Ignore comments
+		if(trimmedline[0] == '#')
+		{
+			dst.push_back(line+line_end);
+			return true;
+		}
+
+		Strfnd sf(trim(line));
+
+		std::string name = sf.next("=");
+		name = trim(name);
+
+		if(name == "")
+		{
+			dst.push_back(line+line_end);
+			return true;
+		}
+		
+		std::string value = sf.next("\n");
+		value = trim(value);
+		
+		if(m_settings.find(name))
+		{
+			std::string newvalue = m_settings[name];
+			
+			if(newvalue != value)
+			{
+				dstream<<"Changing value of \""<<name<<"\" = \""
+						<<value<<"\" -> \""<<newvalue<<"\""
+						<<std::endl;
+			}
+
+			dst.push_back(name + " = " + newvalue + line_end);
+
+			updated[name] = true;
+		}
+		
+		return true;
+	}
+
+	/*
+		Updates configuration file
+
+		Returns true on success
+	*/
+	bool updateConfigFile(const char *filename)
+	{
+		dstream<<"Updating configuration file: \""
+				<<filename<<"\""<<std::endl;
+		
+		core::list<std::string> objects;
+		core::map<std::string, bool> updated;
+		
+		// Read and modify stuff
+		{
+			std::ifstream is(filename);
+			if(is.good() == false)
+			{
+				dstream<<"Error opening configuration file"
+						" for reading: \""
+						<<filename<<"\""<<std::endl;
+				return false;
+			}
+
+			while(getUpdatedConfigObject(is, objects, updated));
+		}
+		
+		// Write stuff back
+		{
+			std::ofstream os(filename);
+			if(os.good() == false)
+			{
+				dstream<<"Error opening configuration file"
+						" for writing: \""
+						<<filename<<"\""<<std::endl;
+				return false;
+			}
+			
+			/*
+				Write updated stuff
+			*/
+			for(core::list<std::string>::Iterator
+					i = objects.begin();
+					i != objects.end(); i++)
+			{
+				os<<(*i);
+			}
+
+			/*
+				Write stuff that was not already in the file
+			*/
+			for(core::map<std::string, std::string>::Iterator
+					i = m_settings.getIterator();
+					i.atEnd() == false; i++)
+			{
+				if(updated.find(i.getNode()->getKey()))
+					continue;
+				std::string name = i.getNode()->getKey();
+				std::string value = i.getNode()->getValue();
+				dstream<<"Adding \""<<name<<"\" = \""<<value<<"\""
+						<<std::endl;
+				os<<name<<" = "<<value<<"\n";
+			}
+		}
+		
+		return true;
+	}
+
+	/*
+		NOTE: Types of allowed_options are ignored
+
+		returns true on success
+	*/
+	bool parseCommandLine(int argc, char *argv[],
+			core::map<std::string, ValueSpec> &allowed_options)
+	{
+		int i=1;
+		for(;;)
+		{
+			if(i >= argc)
+				break;
+			std::string argname = argv[i];
+			if(argname.substr(0, 2) != "--")
+			{
+				dstream<<"Invalid command-line parameter \""
+						<<argname<<"\": --<option> expected."<<std::endl;
+				return false;
+			}
+			i++;
+
+			std::string name = argname.substr(2);
+
+			core::map<std::string, ValueSpec>::Node *n;
+			n = allowed_options.find(name);
+			if(n == NULL)
+			{
+				dstream<<"Unknown command-line parameter \""
+						<<argname<<"\""<<std::endl;
+				return false;
+			}
+
+			ValueType type = n->getValue().type;
+
+			std::string value = "";
+			
+			if(type == VALUETYPE_FLAG)
+			{
+				value = "true";
+			}
+			else
+			{
+				if(i >= argc)
+				{
+					dstream<<"Invalid command-line parameter \""
+							<<name<<"\": missing value"<<std::endl;
+					return false;
+				}
+				value = argv[i];
+				i++;
+			}
+			
+
+			dstream<<"Valid command-line parameter: \""
+					<<name<<"\" = \""<<value<<"\""
+					<<std::endl;
+			set(name, value);
+		}
+
+		return true;
+	}
+
 	void set(std::string name, std::string value)
 	{
 		m_settings[name] = value;
 	}
 
+	void setDefault(std::string name, std::string value)
+	{
+		m_defaults[name] = value;
+	}
+
+	bool exists(std::string name)
+	{
+		return (m_settings.find(name) || m_defaults.find(name));
+	}
+
 	std::string get(std::string name)
 	{
 		core::map<std::string, std::string>::Node *n;
 		n = m_settings.find(name);
 		if(n == NULL)
+		{
+			n = m_defaults.find(name);
+			if(n == NULL)
+			{
 				throw SettingNotFoundException("Setting not found");
+			}
+		}
 
 		return n->getValue();
 	}
@@ -749,6 +985,18 @@ public:
 		return is_yes(get(name));
 	}
 	
+	bool getFlag(std::string name)
+	{
+		try
+		{
+			return getBool(name);
+		}
+		catch(SettingNotFoundException &e)
+		{
+			return false;
+		}
+	}
+
 	// Asks if empty
 	bool getBoolAsk(std::string name, std::string question, bool def)
 	{
@@ -809,6 +1057,7 @@ public:
 
 private:
 	core::map<std::string, std::string> m_settings;
+	core::map<std::string, std::string> m_defaults;
 };
 
 /*