anchor.diff:  @ECHO OFF
   REM Copyright 2015 Ben Vanik. All Rights Reserved.
   
  -SET DIR=%~dp0
  +SET "DIR=%~dp0"
   
   REM ============================================================================
   REM Environment Validation
  
positive.code:   GOTO :found_python
  )
  CALL SET CANDIDATE_PATH=%%CANDIDATE_PATHS[%CANDIDATE_INDEX%]%%
  IF NOT EXIST %CANDIDATE_PATH% (
    SET /A CANDIDATE_INDEX+=1
    GOTO :check_candidate_loop
  )
  CALL :get_size %CANDIDATE_PATH%
  IF %_SIZE% NEQ 0 (
    SET FOUND_PATH=%CANDIDATE_PATH%
    GOTO :found_python
  )
  SET /A CANDIDATE_INDEX+=1
  GOTO :check_candidate_loop
  
  :found_python
  IF %FOUND_PATH%=="" (
    ECHO ERROR: no Python executable found on PATH.
    ECHO Make sure you can run 'python' or 'python3' in a Command Prompt.
    ENDLOCAL & SET _RESULT=1
    GOTO :eof
  )
  
  CMD /C %FOUND_PATH% -c "import sys; sys.exit(1 if not sys.version_info[:2] >= (3, 4) else 0)"
  IF %ERRORLEVEL% NEQ 0 (
    ECHO ERROR: Python version mismatch - not 3.4+
    ECHO Found Python executable was '%FOUND_PATH%'.
    ENDLOCAL & SET _RESULT=1
    GOTO :eof
  )
  
  ENDLOCAL & (
    SET _RESULT=0
    SET PYTHON_EXE=%FOUND_PATH%
  )
  GOTO :eof
  
  :get_size
  SET _SIZE=%~z1
  goto :eof
  
negative.code: 
  SET FOUND_PATH=""
  
  SET "CANDIDATE_PATHS[0]=C:\python37\python.exe"
  SET "CANDIDATE_PATHS[1]=C:\python36\python.exe"
  SET "CANDIDATE_PATHS[2]=C:\python35\python.exe"
  SET "CANDIDATE_PATHS[3]=C:\python34\python.exe"
  SET OUTPUT_INDEX=4
  
  FOR /F "usebackq delims=" %%L IN (`2^>NUL where python3`) DO (
    IF %%~zL NEQ 0 (
      SET "CANDIDATE_PATHS[!OUTPUT_INDEX!]=%%L"
      SET /A OUTPUT_INDEX+=1
    )
  )
  FOR /F "usebackq delims=" %%L IN (`2^>NUL where python`) DO (
    IF %%~zL NEQ 0 (
      SET "CANDIDATE_PATHS[!OUTPUT_INDEX!]=%%L"
      SET /A OUTPUT_INDEX+=1
    )
  )
  
  SET CANDIDATE_INDEX=0
  