set up Alpha Half-Life and run

@echo off
SetLocal EnableDelayedExpansion

:: START batch for Alpha Half-Life

:: cheking if batch started in debug mode
if "%1"=="debug" set echo==echo

:: defaults
set def_engine=enginegl
set engine_cmd=_ _g _gl
set ndef_engine=engine

set def_game=valve
set def_heapsize=64

set def_mode=fullscreen
set mode_cmd=_ _f _ful _full _fullscreen
set def_width=1280
set def_height=1024

set ndef_mode=window
set ndef_width=1200
set ndef_height=900

set def_bitdepth=32
set ndef_bitdepth=16

set def_video=14

set break=b brk break
set default=d def default
set manual=m man manual

:: hints
color
echo you can enter any time one of the following commands:
echo   %break%
echo     - to immediatelly quit without running the game
echo   %default%
echo     - to skip this and all next steps and run the game using default settings
echo   %manual%
echo     - to skip this and all next steps and enter commandline by hand
echo.

:engine
echo Choose the engine
echo   [nothing] : %def_engine%
echo   [else]    : %ndef_engine%
set /p engine=
for %%a in (%break%) do (
    if "%engine%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%engine%"=="%%a" goto manual
)
for %%a in (%default%) do (
    if "%engine%"=="%%a" (
        color 60
        set engine=
        goto default
    )
)
set engine=_%engine%
for %%a in (%engine_cmd%) do (
    if "%%a"=="%engine%" (
        color 60
        set engine=%def_engine%
    )
)
if not "%engine%"=="%def_engine%" (
    color 30
    set engine=%ndef_engine%
)

:game
echo Choose the game
echo   [nothing] : Alpha (%def_game%)
echo   [else]    : [else]
ls --hide=*.*
set /p game=
for %%a in (%break%) do (
    if "%game%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%game%"=="%%a" (
        set game=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%game%"=="%%a" (
        set game=
        goto default
    )
)
if "%game%"=="" (
    set game=%def_game%
)
if not exist %game%\ (
    echo cannot find the game: %game%
    goto game
) else (
    set game=-game %game%
)

:heapsize
echo Set heapsize
echo   [nothing] : %def_heapsize%M
echo   [else]    : [else] (in megabytes)
set /p heapsize=
for %%a in (%break%) do (
    if "%heapsize%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%heapsize%"=="%%a" (
        set heapsize=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%heapsize%"=="%%a" (
        set heapsize=
        goto default
    )
)
if "%heapsize%"=="" (
    set heapsize=%def_heapsize%
)
set /a heapsize=%heapsize%*1024
set heapsize=-heapsize %heapsize%

:: engine and enginegl use different video switches
if "%engine%"=="engine" (
    set wcmd=+vid_config_x
    set hcmd=+vid_config_y
    goto video
) else (
    set wcmd=-width
    set hcmd=-height
)

:bitdepth
echo Set bitdepth
echo   [nothing] : %def_bitdepth%
echo   [else]    : %ndef_bitdepth%
set /p bitdepth=
for %%a in (%break%) do (
    if "%bitdepth%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%bitdepth%"=="%%a" (
        set bitdepth=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%bitdepth%"=="%%a" (
        set bitdepth=
        goto default
    )
)
if "%bitdepth%"=="" (
    set bitdepth=-bpp %def_bitdepth%
) else (
    set bitdepth=-bpp %ndef_bitdepth%
)

:mode
echo Run windowed or in fullscreen?
echo   [nothing] : %def_mode%
echo   [else]    : %ndef_mode%
set /p mode=
for %%a in (%break%) do (
    if "%mode%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%mode%"=="%%a" (
        set mode=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%mode%"=="%%a" (
        set mode=
        goto default
    )
)
set mode=_%mode%
for %%a in (%mode_cmd%) do (
    if "%%a"=="%mode%" (
        set mode=%def_mode%
    )
)
if not "%mode%"=="%def_mode%" (
    set mode=%ndef_mode%
)

:: default resolutions
if "%mode%"=="%def_mode%" (
    set w=%def_width%
    set h=%def_height%
) else (
    set w=%ndef_width%
    set h=%ndef_height%
)

:: skip specific options for software engine
goto resolution

:video
echo Set vid_mode
echo   [nothing] : %def_video%
echo   [else]    : [else]
echo list of possible values:
echo windowed
echo   0 for 320x240
echo   1 for 640x480
echo   2 for user-defined
echo fullscreen
echo   3 for 320x240
echo   4 for 640x480
echo   5 for 800x600
echo   6 for 1024x768
echo   7 for 1280x1024
set /p video=
for %%a in (%break%) do (
    if "%video%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%video%"=="%%a" (
        set video=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%video%"=="%%a" (
        set video=
        goto start
    )
)
if "%video%"=="" (
    set video=+vid_mode %def_video%
) else (
    set video=+vid_mode %video%
)

:: check for windowed mode
if not "%video%"=="+vid_mode 2" (
    goto pass
)
set w=%ndef_width%
set h=%ndef_height%
set startwindowed=-startwindowed

:resolution

:: width
echo Set width resolution
echo   [nothing] : %w%
echo   [else]    : [else]
set /p width=
for %%a in (%break%) do (
    if "%width%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%width%"=="%%a" (
        set width=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%width%"=="%%a" (
        set width=
        goto start
    )
)
if "%width%"=="" (
    set width=%wcmd% %w%
) else (
    set width=%wcmd% %width%
)

:: height
echo Set height resolution
echo   [nothing] : %h%
echo   [else]    : [else]
set /p height=
for %%a in (%break%) do (
    if "%height%"=="%%a" goto eof
)
for %%a in (%manual%) do (
    if "%height%"=="%%a" (
        set height=
        goto pass
    )
)
for %%a in (%default%) do (
    if "%height%"=="%%a" (
        set height=
        goto start
    )
)
if "%height%"=="" (
    set height=%hcmd% %h%
) else (
    set height=%hcmd% %height%
)

:pass
color 20
echo Set the additional options
echo   [nothing] : [nothing]
echo   [else]    : [else]
call :switches
set /p options=
for %%a in (%break%) do (
    if "%options%"=="%%a" goto eof
)

:start
%echo% start %engine%.exe %game% %heapsize% %video% %bitdepth% %width% %height% %mode% %startwindowed% %options%
goto eof

:manual
color 47
echo WARNING: you have choosed to skip hints and enter the commandline manually.
echo   [nothing] : [nothing]
echo   [else]    : [else]
echo Enter full command to start game, e. g.:
echo.
echo   %def_engine%.exe -game %def_game% -heapsize 16384 -%def_mode% -width %def_width% -height %def_height% -bpp %def_bitdepth% +vid_config_x %def_width% +vid_config_y %def_height% +vid_mode %def_video% +map somemap
echo.
call :switches
set /p cmdline=
for %%a in (%break%) do (
    if "%cmdline%"=="%%a" goto eof
)
%echo% start %cmdline%
goto eof

:default
if not defined engine set engine=%def_engine%
if not defined game set game=-game %def_game%
if not defined heapsize (
    set /a heapsize=%def_heapsize%*1024
    set heapsize=-heapsize !heapsize!
)
if "%engine%"=="engine" (
    if not defined video set video=+vid_mode %def_video%
    if "%video%"=="+vid_mode 2" (
        if not defined width set width=+vid_config_x %ndef_width%
        if not defined height set height=+vid_config_y %ndef_height%
    )
) else (
    if not defined bitdepth set bitdepth=-bpp %def_bitdepth%
    if not defined mode set mode=%def_mode%
    if "%mode%"=="-window" (
        if not defined width set width=-width %ndef_width%
        if not defined height set height=-height %ndef_height%
    ) else (
        if not defined width set width=-width %def_width%
        if not defined height set height=-height %def_height%
    )
)
goto start

:eof
color
EndLocal
exit/b

:switches
echo list of additional switches:
echo   memory:  -winlock       -winlockunlock
echo   draw:    -nodirectdraw  -startwindowed  -nowindirect     -noautostretch
echo            -notriplebuf   -novbeaf        -nofulldib       -dibonly
echo            -allow360      -noforcevga     +vid_window_x X  +vid_window_y Y
echo            -resetwinpos
echo   sound:   -wavonly       -nocdaudio      -nosound         -primarysound
echo            -snoforceformat
echo   control: -dinput
echo   net:     -listen NUM
echo   ? :      -basedir DIR   -sndspeed MHz   -sndbits BITS    -cddev DEV
echo            -nomtex        -ip
echo.