anchor.diff:  @echo.
   @echo %TAG% Installing tt...
   pip install --upgrade --editable . >nul 2>&1
  -where tt || @echo Installation of tt failed & exit /b 1
  +where tt >nul 2>&1 || @echo %TAG% Installation of tt failed & exit /b 1
   @echo %TAG% OK.
   @echo.
   exit /b
  
positive.code: if /I "%~1"=="test-sdist" call :test-sdist & exit /b
  if /I "%~1"=="test-bdist-wheel" call :test-bdist-wheel & exit /b
  if /I "%~1"=="get-reqs" call :get-reqs & exit /b
  if /I "%~1"=="update-reqs" call :write-reqs & exit /b
  if /I "%~1"=="check-dev-env" call :check-dev-env & exit /b
  if /I "%~1"=="check-all" call :check-all & exit /b
  @echo Unknown target called. & exit /b 1
  
negative.code: exit /b
  
  :doc
  @echo.
  @echo %TAG% Beginning generation of documentation...
  sphinx-apidoc -f -o docs\source .
  pushd docs
  make html
  popd
  @echo %TAG% OK.
  @echo.
  exit /b
  
  :flake8
  