emdwp.bat

:: Entry point for running python scripts on windows systems.
::
:: Automatically generated by `create_entry_points.py`; DO NOT EDIT.
::
:: To make modifications to this file, edit `tools/run_python.bat` and then run
:: `tools/maint/create_entry_points.py`

:: N.b. In Windows .bat scripts, the ':' character cannot appear inside any if () blocks,
:: or there will be a parsing error.

:: All env. vars specified in this file are to be local only to this script.
@setlocal
:: -E will not ignore _PYTHON_SYSCONFIGDATA_NAME an internal
:: of cpython used in cross compilation via setup.py.
@set _PYTHON_SYSCONFIGDATA_NAME=
@set EM_PY=%EMSDK_PYTHON%
@if "%EM_PY%"=="" (
  set EM_PY=python
)

:: Work around Windows bug https://github.com/microsoft/terminal/issues/15212 : If this
:: script is invoked via enclosing the invocation in quotes via PATH lookup, then %~f0 and
:: %~dp0 expansions will not work.
:: So first try if %~dp0 might work, and if not, manually look up this script from PATH.
@if exist "%~f0" (
  set MYDIR=%~dp0
  goto FOUND_MYDIR
)
@for %%I in (tools\emdwp.bat) do (
  @if exist %%~$PATH:I (
    set MYDIR=%%~dp$PATH:I
  ) else (
    echo Fatal Error! Due to a Windows bug, we are unable to locate the path to tools\emdwp.bat.
    echo To help this issue, try removing unnecessary quotes in the invocation of emcc,
    echo or add Emscripten directory to PATH.
    echo See github.com/microsoft/terminal/issues/15212 and
    echo github.com/emscripten-core/emscripten/issues/19207 for more details.
  )
)
:FOUND_MYDIR

:: Python Windows bug https://bugs.python.org/issue34780: If this script was invoked via a
:: shared stdin handle from the parent process, and that parent process stdin handle is in
:: a certain state, running python.exe might hang here. To work around this, if
:: EM_WORKAROUND_PYTHON_BUG_34780 is defined, invoke python with '< NUL' stdin to avoid
:: sharing the parent's stdin handle to it, avoiding the hang.

:: On Windows 7, the compiler batch scripts are observed to exit with a non-zero errorlevel,
:: even when the python executable above did succeed and quit with errorlevel 0 above.
:: On Windows 8 and newer, this issue has not been observed. It is possible that this
:: issue is related to the above python bug, but this has not been conclusively confirmed,
:: so using a separate env. var EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG to enable the known
:: workaround this issue, which is to explicitly quit the calling process with the previous
:: errorlevel from the above command.

:: Also must use goto to jump to the command dispatch, since we cannot invoke emcc from
:: inside a if() block, because if a cmdline param would contain a char '(' or ')', that
:: would throw off the parsing of the cmdline arg.
@if "%EM_WORKAROUND_PYTHON_BUG_34780%"=="" (
  @if "%EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG%"=="" (
    goto NORMAL
  ) else (
    goto NORMAL_EXIT
  )
) else (
  @if "%EM_WORKAROUND_WIN7_BAD_ERRORLEVEL_BUG%"=="" (
    goto MUTE_STDIN
  ) else (
    goto MUTE_STDIN_EXIT
  )
)

:NORMAL_EXIT
@"%EM_PY%" -E "%MYDIR%tools\emdwp.py" %*
@exit %ERRORLEVEL%

:MUTE_STDIN
@"%EM_PY%" -E "%MYDIR%tools\emdwp.py" %* < NUL
@exit /b %ERRORLEVEL%

:MUTE_STDIN_EXIT
@"%EM_PY%" -E "%MYDIR%tools\emdwp.py" %* < NUL
@exit %ERRORLEVEL%

:NORMAL
@"%EM_PY%" -E "%MYDIR%tools\emdwp.py" %*