Idempotent automation of Python and PyPI setup

CWD=$(pwd)

PYENV="${HOME}/.pyenv"
PYVER='3.5.0'

if ! which pyenv &> /dev/null
then
    [ ! -d ${PYENV} ] && git clone git://github.com/yyuu/pyenv.git ${PYENV}
    export PATH="${PYENV}/bin:${PATH}"
    eval "$(pyenv init -)"
else
    cd ${PYENV}
    git pull
    cd ${CWD}
fi

if ! pyenv versions | grep ${PYVER} &> /dev/null
then
    CFLAGS="-I$(brew --prefix readline)/include" \
    LDFLAGS="-L$(brew --prefix readline)/lib" \
    pyenv install ${PYVER}
fi

pyenv global ${PYVER}
pyenv rehash

unset PYENV PYVER

if which pip &> /dev/null
then
    PIPS=(
        'ansible'
        'awscli'
        'fabric'
        'flake8'
    )

    for PIP in "${PIPS[@]}"
    do
        pip install --upgrade ${PIP}
    done

    pyenv rehash

    unset PIPS PIP
fi

unset CWD

export PATH="${HOME}/.pyenv/bin:${PATH}"
eval "$(pyenv init -)"
[ -f "${HOME}/.pyenv/completions/pyenv.bash" ] && source "${HOME}/.pyenv/completions/pyenv.bash"

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