get-latest-pyenv-versions.sh

#!/usr/bin/env bash
#
# Print out commands for uninstalling old Python 2.7, PyPy, 3.x versions,
# and installing the latest versions.
#
# Currently does 2.7, PyPy, 3.3, 3.4, 3.5, and 3.6.
# pyenv uninstall -f 2.7.13
# pyenv uninstall -f 3.3.6
# pyenv uninstall -f 3.4.6
# pyenv uninstall -f 3.5.3
# pyenv uninstall -f 3.6.0
# pyenv uninstall -f pypy3.3-5.2-alpha1
# pyenv install pypy-dev
# pyenv install 2.7.13
# pyenv install 3.3.6
# pyenv install 3.4.6
# pyenv install 3.5.3
# pyenv install 3.6.1
# pyenv global 3.6.1 3.5.3 2.7.13 pypy-dev

#set -x
set -efu
set -o pipefail

if ! which pyenv-migrate &> /dev/null; then
  echo 'pyenv-migrate is required for this script.'
  exit 1
fi

if ! which aria2c &> /dev/null; then
  echo 'aria2c is recommended to speed up downloads'
fi

installable_versions="$(pyenv install -l)"
installed_versions="$(pyenv versions --bare)"

#for version in "2.7" "3.3" "3.4" "3.5" "3.6"; do
for version in "2.7" "3.5" "3.6"; do
  echo "Checking ${version}"
  version="${version/./\\.}"
  versions="$(echo "$installable_versions" | egrep "^\W*${version}")"
  echo "Found versions:"
  echo "${versions}"
  latest_version="$(echo "$versions" | tail -n 1 | tr -d "[:space:]")"
  echo "Latest version: ${latest_version}"
  installed_version="$(echo "$installed_versions" | egrep "^\W*${version}" | tr -d "[:space:]")"
  echo "Installed version: ${installed_version}"
  if [[ "${installed_version}" != "${latest_version}" ]]; then
    echo "Needs to update!!!"
    pyenv install "${latest_version}"
    pyenv migrate "${installed_version}" "${latest_version}"
    pyenv uninstall -f "${installed_version}"
  fi
  echo
done