Add a command to increment cvars

src/command.c

@@ -50,6 +50,7 @@ static void COM_Exec_f(void);
 static void COM_Wait_f(void);
 static void COM_Help_f(void);
 static void COM_Toggle_f(void);
+static void COM_Add_f(void);
 
 static void CV_EnforceExecVersion(void);
 static boolean CV_FilterVarByVersion(consvar_t *v, const char *valstr);
@@ -291,6 +292,7 @@ void COM_Init(void)
 	COM_AddCommand("wait", COM_Wait_f);
 	COM_AddCommand("help", COM_Help_f);
 	COM_AddCommand("toggle", COM_Toggle_f);
+	COM_AddCommand("add", COM_Add_f);
 	RegisterNetXCmd(XD_NETVAR, Got_NetVar);
 }
 
@@ -855,6 +857,27 @@ static void COM_Toggle_f(void)
 	CV_AddValue(cvar, +1);
 }
 
+/** Command variant of CV_AddValue
+  */
+static void COM_Add_f(void)
+{
+	consvar_t *cvar;
+
+	if (COM_Argc() != 3)
+	{
+		CONS_Printf(M_GetText("Add <cvar_name> <value>: Add to the value of a cvar. Negative values work too!\n"));
+		return;
+	}
+	cvar = CV_FindVar(COM_Argv(1));
+	if (!cvar)
+	{
+		CONS_Alert(CONS_NOTICE, M_GetText("%s is not a cvar\n"), COM_Argv(1));
+		return;
+	}
+
+	CV_AddValue(cvar, atoi(COM_Argv(2)));
+}
+
 // =========================================================================
 //                      VARIABLE SIZE BUFFERS
 // =========================================================================