Make console history persistent

The console history is saved to a file on quit and restored after
starting the game.
So the commands entered in the console the last times the game was run
are still available in the console-history, just like commands that
were just entered.

neo/framework/Common.cpp

@@ -2853,6 +2853,9 @@ void idCommonLocal::Init( int argc, char **argv ) {
 
 		ClearCommandLine();
 
+		// load the persistent console history
+		console->LoadHistory();
+
 		com_fullyInitialized = true;
 	}
 
@@ -2881,6 +2884,9 @@ void idCommonLocal::Shutdown( void ) {
 	idAsyncNetwork::server.Kill();
 	idAsyncNetwork::client.Shutdown();
 
+	// save persistent console history
+	console->SaveHistory();
+
 	// game specific shut down
 	ShutdownGame( false );
 

neo/framework/Console.cpp

@@ -70,6 +70,9 @@ public:
 	void				Dump( const char *toFile );
 	void				Clear();
 
+	virtual void		SaveHistory();
+	virtual void		LoadHistory();
+
 	//============================
 
 	const idMaterial *	charSetShader;
@@ -516,6 +519,38 @@ void idConsoleLocal::Dump( const char *fileName ) {
 	fileSystem->CloseFile( f );
 }
 
+void idConsoleLocal::SaveHistory() {
+	idFile *f = fileSystem->OpenFileWrite( "consolehistory.dat" );
+	for ( int i=0; i < COMMAND_HISTORY; ++i ) {
+		// make sure the history is in the right order
+		int line = (nextHistoryLine + i) % COMMAND_HISTORY;
+		const char *s = historyEditLines[line].GetBuffer();
+		if ( s && s[0] ) {
+			f->WriteString(s);
+		}
+	}
+	fileSystem->CloseFile(f);
+}
+
+void idConsoleLocal::LoadHistory() {
+	idFile *f = fileSystem->OpenFileRead( "consolehistory.dat" );
+	if ( f == NULL ) // file doesn't exist
+		return;
+
+	historyLine = 0;
+	idStr tmp;
+	for ( int i=0; i < COMMAND_HISTORY; ++i ) {
+		if ( f->Tell() >= f->Length() ) {
+			break; // EOF is reached
+		}
+		f->ReadString(tmp);
+		historyEditLines[i].SetBuffer(tmp.c_str());
+		++historyLine;
+	}
+	nextHistoryLine = historyLine;
+	fileSystem->CloseFile(f);
+}
+
 /*
 ================
 idConsoleLocal::PageUp

neo/framework/Console.h

@@ -67,6 +67,9 @@ public:
 
 	virtual void	Draw( bool forceFullScreen ) = 0;
 	virtual void	Print( const char *text ) = 0;
+
+	virtual void	SaveHistory() = 0;
+	virtual void	LoadHistory() = 0;
 };
 
 extern idConsole *	console;	// statically initialized to an idConsoleLocal