Батники - вопросы и решения

for /f %%A in ('...findstr...') do (
  set var=& for %%f in (ext1 ext2 ext3 ext4) do if /i "%%~xB"==".%%f" set var=1
  if "%%A"=="..." if defined var (
    ...
    ...
    ...
  ) ELSE (
    echo error
    ...
    ...
    ...
    exit /b
    )
)
продолжение действий
(предполагается, что раз не была определена ошибка и не было выхода, значит все норм)
...
...
...

if /i not "%file_ext%"==".ext1" if /i not "%file_ext%"==".ext2" ^
if /i not "%file_ext%"==".ext3" if /i not "%file_ext%"==".ext4" GoTo :error

for /f %%A in ('...findstr...') do (
  set var=& for %%f in (ext1 ext2 ext3 ext4) do if /i "%%~xB"==".%%f" set var=1
  if "%%A"=="..." if defined var (
    ...
    ...
    ...
    ...
    exit /b
  )
)
echo error
...
...
exit /b

set file_ext=& for /f %%A in ('...findstr...') do (
  if "%%A"=="..." (
    ...
    set "file_ext=%%~xB"
    ...
  )
)
set var=& for %%f in (ext1 ext2 ext3 ext4) do if /i "%file_ext%"==".%%f" set var=1
if not defined var (
  echo error
  ...
  ...
  exit /b
)
продолжение действий
...
...
...
exit /b

:banner_2
echo   APK-FILE SELECT...
set apk=& set "banner_fullpath=null"& set "banner_ext=null"& set "banner_name.ext=null"
chcp 1251 >nul
for /f "delims=" %%A in ('FileToOpen "set apk=" "%SystemDrive%\*.apk" "SELECT APK-FILE" /noquote') do %%A
chcp 866 >nul
if not DEFINED apk exit /b
if not EXIST "%apk%" set "banner=null"& set "_banner=not chosen"& GoTo :file_sel_error
for /f "delims=" %%A in ("%apk%") do set "apk_name=%%~nA"
for /f "useback tokens=5,6 delims='" %%A in (`aapt d badging "%apk%"^| findstr /irc:"application: .* banner='res/.*'"`) do (
  if "%%A"==" banner=" (
    set "banner_fullpath=%%B"
    set "banner_ext=%%~xB"
    set "banner_name.ext=%%~nxB"
  )
)
set ext_var=& for %%A in (.png .webp .jpg .jpeg .bmp .gif) do (
  if /i "%banner_ext%"=="%%A" set ext_var=OK
)
if not DEFINED ext_var (
  set "banner=null"
  set "_banner=not chosen"
  echo.
  cocolor 0C
  echo   ERROR: UNABLE TO DETECT BANNER. MAYBE THE APK HAS A "NON-STANDARD" STRUCTURE, OR THE RESOURCES ARE ENCRYPTED,
  echo          OR THERE IS NO BANNER IN THIS APK
  cocolor 07
  echo.
  <nul set /p "=%del_char%  "& pause
  exit /b
)
7z e -ssc -y "%apk%" "%banner_fullpath%" >nul 2>nul
if /i "%banner_ext%"==".webp" (
  convert "%banner_name.ext%" "%Desktop%\%apk_name%_banner.png"
  del /F/Q "%banner_name.ext%" >nul 2>nul
  set "banner=%Desktop%\%apk_name%_banner.png"
  call set "_banner=%%banner%%"
  exit /b
)
move /Y "%banner_name.ext%" "%Desktop%\%apk_name%_banner.png" >nul
set "banner=%Desktop%\%apk_name%_banner.png"
set "_banner=%banner%"
exit /b