@if '%1' EQU '' goto :begin_search

@if '%2' EQU '' goto :one_arg

@if exist "%*" (set PYTHON="%*") & (set _Py_Python_Source=from environment) & goto :found

@goto :begin_search

:one_arg

@if exist "%~1" (set PYTHON="%~1") & (set _Py_Python_Source=from environment) & goto :found

:begin_search

@set PYTHON=

@set _Py_EXTERNALS_DIR=%EXTERNAL_DIR%

@if "%_Py_EXTERNALS_DIR%"=="" (set _Py_EXTERNALS_DIR=%~dp0\..\externals)

@if exist "%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe" (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") & (set _Py_Python_Source=found in externals directory) & goto :found

@if NOT "%HOST_PYTHON%"=="" @%HOST_PYTHON% -Ec "import sys; assert sys.version_info[:2] >= (3, 6)" >nul 2>nul && (set PYTHON="%HOST_PYTHON%") && (set _Py_Python_Source=found as HOST_PYTHON) && goto :found

@for %%p in (3.7 3.6) do @py -%%p -EV >nul 2>&1 && (set PYTHON=py -%%p) && (set _Py_Python_Source=found %%p with py.exe) && goto :found

@if NOT exist "%_Py_EXTERNALS_DIR%" mkdir "%_Py_EXTERNALS_DIR%"

@set _Py_NUGET=%NUGET%

@set _Py_NUGET_URL=%NUGET_URL%

@set _Py_HOST_PYTHON=%HOST_PYTHON%

@if "%_Py_HOST_PYTHON%"=="" set _Py_HOST_PYTHON=py

@if "%_Py_NUGET%"=="" (set _Py_NUGET=%_Py_EXTERNALS_DIR%\nuget.exe)

@if "%_Py_NUGET_URL%"=="" (set _Py_NUGET_URL=https://aka.ms/nugetclidl)

@if NOT exist "%_Py_NUGET%" (

@echo Downloading nuget...

@rem NB: Must use single quotes around NUGET here, NOT double!

@rem Otherwise, a space in the path would break things

@rem If it fails, retry with any available copy of Python

@powershell.exe -Command Invoke-WebRequest %_Py_NUGET_URL% -OutFile '%_Py_NUGET%'

@if errorlevel 1 (

@%_Py_HOST_PYTHON% -E "%~dp0\urlretrieve.py" "%_Py_NUGET_URL%" "%_Py_NUGET%"

)

)

@echo Installing Python via nuget...

@"%_Py_NUGET%" install pythonx86 -ExcludeVersion -OutputDirectory "%_Py_EXTERNALS_DIR%"

@if not errorlevel 1 (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") & (set _Py_Python_Source=found on nuget.org) & goto :found

@set _Py_Python_Source=

@set _Py_EXTERNALS_DIR=

@set _Py_NUGET=

@set _Py_NUGET_URL=

@set _Py_HOST_PYTHON=

@exit /b 1

:found

@echo Using %PYTHON% (%_Py_Python_Source%)

@set _Py_Python_Source=

@set _Py_EXTERNALS_DIR=

@set _Py_NUGET=

@set _Py_NUGET_URL=

@set _Py_HOST_PYTHON=