Snaker - The Interactive Snake Game

@echo off
title Snaker
color 0a
echo Starting...
timeout /t 15 /nobreak
cls
echo Snaker v.1.0.0.0
echo Welcome. Press any key to start
pause
if "%~1" == "startGame" goto :game
if "%~1" == "startController" goto :controller



set "choice="
2>nul >nul choice /c:yn /t 0 /d y
if errorlevel 1 if not errorlevel 2 set "choice=choice /cs"
if not defined choice (
  2>nul >nul choice /c:yn /t:y,1
  if errorlevel 1 if not errorlevel 2 set "choice=choice /s"
)
if not defined choice (
  echo ERROR: This game requires the CHOICE command, but it is missing.
  echo Game aborted. :(
  echo(
  echo A 16 bit port of CHOICE.EXE from FREEDOS is available at
  echo http://winsupport.org/utilities/freedos-choice.html
  echo(
  echo A 32 bit version from ??? suitable for 64 bit machines is available at
  echo http://hp.vector.co.jp/authors/VA007219/dkclonesup/choice.html
  echo(
  exit /b
)




set "keys=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
set "keyFile=key.txt"
set "cmdFile=cmd.txt"
set "highscoreFile=last score on !difficulty!.txt"


copy nul "%keyFile%" >nul
start "" /b "%~f0" startController 9^>^>%keyFile% 2^>nul ^>nul
cmd /c "%~f0" startGame 9^<%keyFile% ^<nul
echo(



:close
2>nul (>>"%keyFile%" call )||goto :close
del "%keyFile%"
exit /b
:!!

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:game
setlocal disableDelayedExpansion
title %~nx0
cls



set "up=W"
set "down=S"
set "left=A"
set "right=D"

::Both max to 99! And width to 40 and height to 25!
set "width=40"   max=99
set "height=25"  max=99
:: max playing field: (width-2)*(height-2) <= 1365



set /a cols=width+1, lines=height+10, area=(width-2)*(height-2)
if %area% gtr 1365 (
  echo ERROR: Playfield area too large
  >"%cmdFile%" (echo quit)
  exit
)
if %lines% lss 14 set lines=14
if %cols% lss 46 set cols=46
mode con: cols=%cols% lines=%lines%


set "spinner1=|"
set "spinner2=/"
set "spinner3=-"
set "spinner4=\"
set "spinner5=O"
set "spinner6=$"
set "spinner= spinner1 spinner2 spinner3 spinner4 spinner5 spinner6"

set "space= "
set "bound=*"
set "food=+"
set "head=@"
set "body=O"
set "death=X"
set "playerSpace=%space%%food%"

set "xDiff%up%=+0"
set "xDiff%down%=+0"
set "xDiff%left%=-1"
set "xDiff%right%=+1"

set "yDiff%up%=-1"
set "yDiff%down%=+1"
set "yDiff%left%=+0"
set "yDiff%right%=+0"

set "%up%Axis=Y"
set "%down%Axis=Y"
set "%left%Axis=X"
set "%right%Axis=X"

set "delay1=20"
set "delay2=16"
set "delay3=12"
set "delay4=7"
set "delay5=5"
set "delay6=3"
set "delay0=0"

set "desc1=Mega Slow"
set "desc2=Crawler"
set "desc3=Slow"
set "desc4=Normal"
set "desc5=Fast"
set "desc6=Insane"
set "desc0=Impossible"

set "spinnerDelay=3"

set /a "width-=1, height-=1"



set LF=^





set ^"\n=^^^%LF%%LF%^%LF%%LF%^^"

:: setErr
:::  Sets the ERRORLEVEL to 1
set "setErr=(call)"

:: clrErr
:::  Sets the ERRORLEVEL to 0
set "clrErr=(call )"



set getKey=%\n%
for %%# in (1 2) do if %%#==2 (for /f "eol= delims= " %%1 in ("!args!") do (%\n%
  set "validKeys=%%1"%\n%
  set "key="%\n%
  ^<^&9 set /p "key="%\n%
  if defined key if "!key!" neq ":" (%\n%
    set /a key-=1%\n%
    for %%K in (!key!) do set "key=!keys:~%%K,1!"%\n%
  )%\n%
  for %%K in (!key!) do if "!validKeys:%%K=!" equ "!validKeys!" set "key="%\n%
)) else set args=



set draw=%\n%
cls%\n%
for /l %%Y in (0,1,%height%) do echo(!line%%Y!%\n%
echo Mode=!Difficulty!%\n%
echo Score=!score!


set test=%\n%
for %%# in (1 2) do if %%#==2 (for /f "tokens=1-3" %%1 in ("!args!") do (%\n%
  for %%A in ("!line%%2:~%%1,1!") do if "!%%3:%%~A=!" neq "!%%3!" %clrErr% else %setErr%%\n%
)) else set args=

::ZemByte

set plot=%\n%
for %%# in (1 2) do if %%#==2 (for /f "tokens=1-3" %%1 in ("!args!") do (%\n%
  set "part2=!line%%2:~%%1!"%\n%
  set "line%%2=!line%%2:~0,%%1!!%%3!!part2:~1!"%\n%
)) else set args=


::--------------------------------------
:: start the game
setlocal enableDelayedExpansion
call :initialize


::--------------------------------------
:: main loop (infinite loop)
for /l %%. in (1 0 1) do (

  %=== compute time since last move ===%
  for /f "tokens=1-4 delims=:.," %%a in ("!time: =0!") do set /a "t2=(((1%%a*60)+1%%b)*60+1%%c)*100+1%%d-36610100, tDiff=t2-t1"
  if !tDiff! lss 0 set /a tDiff+=24*60*60*100

  if !tDiff! geq !delay! (
    %=== delay has expired, so time for movement ===%

    %=== establish direction ===%
    %getKey% ASDW
    for %%K in (!key!) do if "!%%KAxis!" neq "!axis!" (
      set /a "xDiff=xDiff%%K, yDiff=yDiff%%K"
      set "axis=!%%KAxis!"
    )

    %=== erase the tail ===%
    set "TX=!snakeX:~-2!"
    set "TY=!snakeY:~-2!"
    set "snakeX=!snakeX:~0,-2!"
    set "snakeY=!snakeY:~0,-2!"
    %plot% !TX! !TY! space

    %=== compute new head location and attempt to move ===%
    set /a "X=PX+xDiff, Y=PY+yDiff"
    set "X= !X!"
    set "Y= !Y!"
    set "X=!X:~-2!"
    set "Y=!Y:~-2!"
    (%test% !X! !Y! playerSpace) && (

      %=== move successful ===%

      %=== remove the new head location from the empty list ===%
      for %%X in ("!X!") do for %%Y in ("!Y!") do set "empty=!empty:#%%~X %%~Y=!"

      (%test% !X! !Y! food) && (
        %=== moving to food - eat it ===%

        %=== restore the tail ===%
        %plot% !TX! !TY! body
        set "snakeX=!snakeX!!TX!"
        set "snakeY=!snakeY!!TY!"

        %=== increment score and locate and draw new food ===%
        set /a "score+=1, F=(!random!%%(emptyCnt-=1))*6+1"
        for %%F in (!F!) do (%plot% !empty:~%%F,5! food)


      ) || (
        %=== moving to empty space ===%

        %=== add the former tail position to the empty list ===%
        set "empty=!empty!#!TX! !TY!"
      )

      %=== draw the new head ===%
      if defined snakeX (%plot% !PX! !PY! body)
      %plot% !X! !Y! head

      %=== Add the new head position to the snake strings ===%
      set "snakeX=!X!!snakeX!"
      set "snakeY=!Y!!snakeY!"
      set "PX=!X!"
      set "PY=!Y!"

      %draw%

    ) || (

      %=== failed move - game over ===%
      %plot% !TX! !TY! body
      call :spinner !PX! !PY! death
      %draw%
      echo(
      color 2c
      echo Note: If you quit now, your score will be
      echo saved in the last score file of !difficulty!
      echo If you press Y, you will go back to the start menu.
      echo If you don't want to override your old file of !difficulty!, then hit Y
      call :ask "Game Over, your score is: !score! on !difficulty!          Would you like to play again? (Y/N)" YN
      color 2e
      if /i "!key!" equ "N" (
        >"%highscoreFile%"  (echo %DATE% %Time% Last score is:!score! on !difficulty!.)
        >"%cmdFile%" (echo quit)
        exit
      ) else (
        call :initialize
      )
    )

    set /a t1=t2
  )
)

:ask  Prompt  ValidKeys

>"%cmdFile%" (echo prompt)
<nul set /p "=%~1 "
:purge
(%getKey% :)
if not defined key goto :purge
:getResponse
(%getKey% %2)
if not defined key (
  >"%cmdFile%" (echo one)
  goto :getResponse
)
exit /b
::ZemByte

:spinner  X  Y  ValueVar
set /a d1=-1000000
for /l %%N in (1 1 5) do for %%C in (%spinner%) do (
  call :spinnerDelay
  %plot% %1 %2 %%C
  %draw%
)
call :spinnerDelay
(%plot% %1 %2 %3)
exit /b

:spinnerDelay
for /f "tokens=1-4 delims=:.," %%a in ("!time: =0!") do set /a "d2=(((1%%a*60)+1%%b)*60+1%%c)*100+1%%d-36610100, dDiff=d2-d1"
if %dDiff% lss 0 set /a dDiff+=24*60*60*100
if %dDiff% lss %spinnerDelay% goto :spinnerDelay
set /a d1=d2
exit /b


::-------------------------------------
:initialize
title Snaker - By: _PaRaD0X_
cls
echo        Snaker

echo ()()()()()()()()()()()()()()()()()()()()()()

echo        Options:
echo(
echo    @   Description    delay
echo   ___  ___________    ______
echo    1   Mega slow C       0.20
echo    2   Crawler   Y      0.16
echo    3   Slow      N      0.12
echo    4   Normal    O      0.07
echo    5   Fast      Y      0.05
echo    6   Insane    T      0.03
echo    0   Impossible C     none
echo(
echo    To exit the game, hit the close button.
echo    Do not delete the "cmd" and/or
echo    the "key" file!
echo(
call :ask "Pick a speed (1-6, 0):" 1234560
set "difficulty=!desc%key%!"
set "delay=!delay%key%!"
echo %key% - %difficulty%
color 0a
echo(
<nul set /p "=Initializing."
set "axis=X"
set "xDiff=+1"
set "yDiff=+0"
set "empty="
set /a "PX=1, PY=height/2, FX=width/2+1, FY=PY, score=0, emptyCnt=0, t1=-1000000"
set "snakeX= %PX%"
set "snakeY= %PY%"
set "snakeX=%snakeX:~-2%"
set "snakeY=%snakeY:~-2%"
for /l %%Y in (0 1 %height%) do (
  <nul set /p "=."
  set "line%%Y="
  for /l %%X in (0,1,%width%) do (
    set "cell="
    if %%Y equ 0        set "cell=%bound%"
    if %%Y equ %height% set "cell=%bound%"
    if %%X equ 0        set "cell=%bound%"
    if %%X equ %width%  set "cell=%bound%"
    if %%X equ %PX% if %%Y equ %PY% set "cell=%head%"
    if not defined cell (
      set "cell=%space%"
      set "eX= %%X"
      set "eY= %%Y"
      set "empty=!empty!#!eX:~-2! !eY:~-2!"
      set /a emptyCnt+=1
    )
    if %%X equ %FX% if %%Y equ %FY% set "cell=%food%"
    set "line%%Y=!line%%Y!!cell!"
  )
)
(%draw%)
echo(
echo Movement keys: %up%=up %down%=down %left%=left %right%=right
echo Avoid running into yourself (%body%%body%%head%) or wall (%bound%)
echo Eat food (%food%) to grow.
echo(
call :ask "Press any alpha-numeric key to start... A/Z" %keys%
>"%cmdFile%" (echo go)
exit /b


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:controller

setlocal enableDelayedExpansion
set "cmd=hold"
set "key="
for /l %%. in (1 0 1) do (
  if "!cmd!" neq "hold" (
    %choice% /n /c:!keys!
    set "key=!errorlevel!"
  )
  if exist "%cmdFile%" (
    <"%cmdFile%" set /p "cmd="
    del "%cmdFile%"
  )
  if "!cmd!" equ "quit" exit
  if defined key (
    if "!cmd!" equ "prompt" >&9 (echo :)
    >&9 (echo !key!)
    if "!cmd!" neq "go" set "cmd=hold"
    set "key="
  )
)

:incorrect_pass
cls
pause
exit


-- DO NOT PASTE BELOW HERE --
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Example:
name.bat
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