venv automation

@echo off
set root=%cd%
set scripts=%root%\venv\scripts
set python=python.exe

IF NOT EXIST "%root%\venv\scripts\activate" (
  echo Could not find a virtual environment
  choice /m "Would you like to create one?"
  if errorlevel 2 goto exit
  if errorlevel 1 goto install

  :exit
  echo 
  exit

  :install
  echo installing a virtual environment.
  %python% -m venv venv
  echo updating pip
  %scripts%\python.exe -m pip install --upgrade pip > nul
  IF EXIST %root%\requirements.txt (
    echo restoring requirements
    %scripts%\pip install -r %root%\requirements.txt > nul
  )
)
echo 
echo ===== Some usefull commands ======================================
echo  freeze:  save all installed packages to a requirements.txt files
echo  restore: restore all packages listed in requirements.txt
echo  pip install ^<package^>: install a package from pypi.
echo  idle: start idle.
echo ==================================================================
echo 

doskey freeze=pip freeze $g %root%\requirements.txt
doskey install=pip install -r %root%\requirements.txt
doskey idle=python -m idlelib

cmd /k %scripts%\activate