Making a batch file do something once - batch-file

Question

I'm making a game and I want a personalized username option that only appears once.
Here is an example:
#echo off
:onetime
echo please enter a username
echo.
set /p newuser=%newuser%:
echo %newuser%> cfg.txt
goto menu
:menu
for /f "tokens=* delims=" %%x in (cfg.txt) do echo %%x
cls
...
I'm trying to figure out how to make :onetime happen once, so that it sends the username to cfg.txt
Anyone know how?

Answer 1

I have cleaned up your code and provided a completed working script, and noted where you will put your game code.
Although Delayed expansion is not needed for this code, I have placed it in the script as you had it in your original script.
Please be mindful of the variable names I have chosen as they are used in several locations.
I have tried to comment the code with info on what it is doing, and I would be happen to explain further if needed.
I'd like to actually play your game when you are completed with it, if I may. :)
Hope that helps.
Ben
BPG.cmd
REM Script: BPG.cmd
REM Version: 1.0
REM Description: Game to play about Monsters.
Rem Notes: Currently Implementing Menu System.
Rem Sets up Variables and checks if the script needs to be re-called.
#(
SETLOCAL ENABLEDelayedExpansion
echo off
SET "eLvl=0"
SET "ScriptFolder=%~dp0"
SET "Log=%~dpn0.log"
SET "ConfigFile=%~dpn0_cfg.txt"
IF /I "%~1" NEQ "MAX" (
ENDLOCAL
ECHO.Game not started Maximized, Opening in a New Window by Running: Start "BPG 1 A Batch of Monsters" /MAX "%~dpnx0" MAX
Start "BPG 1 A Batch of Monsters" /MAX "%~dpnx0" MAX
EXIT /b %eLvl%
)
COLOR 2
)
REM Calls Main Function.
CALL :Main
REM Ends the script.
(
ENDLOCAL
EXIT /b %eLvl%
)
REM Main Function, most of your coding goes here, and this function calls sub functions.
:Main
Rem Check if Config file exists, if it does not, then call the New User Function.
IF NOT EXIST "%ConfigFile%" (
CALL :NewUser
)
Rem Load Username from Config file.
FOR /F "Tokens=*" %%A IN ('Type "%ConfigFile%"') DO (
SET "_UserName=%%~A"
)
Rem Call Menu System
CALL :Menu
REM Based off the option chosen Either Start a new Game or Skip to the End.
REM ECHO.CALL %_Menu_Choice%
CALL %_Menu_Choice%
GOTO :EOF
:NewUser
SETLOCAL
REM Get the Username Input
SET /P "_User=Please Enter a Username: "
REM Output the Username to the config file, overwriting all the file contents:
echo.%_User%>"%ConfigFile%"
ENDLOCAL
GOTO :EOF
:Menu
SETLOCAL
REM Output the Config file contents:
Type "%ConfigFile%"
REM Clear the screen
cls
echo ______ _______ _______
echo I ___ \ I ____ I I ____ \
echo I I I II I II I I \/
echo I I__/ / I I____II I I
echo I __ I I _____I I I ____
echo I I \ \ I I I I \_ I
echo I I___I II I I I___I I
echo I______/ I_/ I_______I A BATCH OF MONSTERS
echo.
echo.
echo 1) Begin
echo.
echo 2) Exit
echo.
set /p "_Choice=%_UserName%, Enter a Number: "
(
REM End the local variable Space, and Set return variables based on the choice, or re-draw the menu.
ENDLOCAL
IF /I "%_Choice%" EQU "1" (
REM ECHO.%_Choice% EQU 1
SET "_Menu_Choice=:Begin_Game"
) ELSE (
IF /I "%_Choice%" EQU "2" (
REM ECHO.%_Choice% EQU 2
SET "_Menu_Choice=GOTO :EOF"
) ELSE (
ECHO.%_Choice% Not Valid!
PAUSE
GOTO :Menu
)
)
)
goto :EOF
:Begin_Game
REM All the remaining code for your game should probably go here.
GOTO :EOF

Answer 2

try checking file existence :
#echo off
:onetime
setlocal enableDelayedExpansion
if not exist "cfg.txt" (
echo please enter a username
echo.
set /p newuser=%newuser%:
echo !newuser!> cfg.txt
goto menu
)
:menu
for /f "tokens=* delims=" %%x in (cfg.txt) do echo %%x
cls