with_pyenv

#!/bin/bash -x
# Run `with_pyenv pyenv update` or remove ./.pyenv or your $PYENV_ROOT to update environment
#
if [[ "${BASH_SOURCE[0]}" = bash ]] ; then
    SCRIPT_DIR=$(dirname "$0")
  else
    SCRIPT_DIR=$(dirname "${BASH_SOURCE[0]}")
fi

SCRIPT_DIR=$(realpath "$SCRIPT_DIR")

echo $SCRIPT_DIR

CCname=${CC:-${CXX:-default}}
export PYENV_VERSION=${PYENV_VERSION:-3.7.4}
export PYENV_ROOT="${PYENV_ROOT:-${SCRIPT_DIR}/.pyenv-${CCname}}"
if [ ! -x "${PYENV_ROOT}/bin/pyenv" ] ; then
    rm -rf "${PYENV_ROOT}"
    DOWNLOADER="wget -O-"
    $DOWNLOADER --version || DOWNLOADER="curl -Lo-"
    $DOWNLOADER https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash
#else
#    ${PYENV_ROOT}/bin/pyenv update
fi
export PATH="${PYENV_ROOT}/bin:$PATH"
eval "$(pyenv init -)"
#eval "$(pyenv virtualenv-init -)"
if [ $(uname) = Darwin ] ; then
  CFLAGS="${CFLAGS} -mmacosx-version-min=10.9"
fi

INSTALL_COMMAND='eval env CFLAGS="-O2 -g -fPIC ${CFLAGS}" pyenv install -k -s "$PYENV_VERSION"'

$INSTALL_COMMAND ||  pyenv update &&  $INSTALL_COMMAND

PKG_CONFIG_PATH=$(python3-config --prefix)/lib/pkgconfig
export PKG_CONFIG_PATH

if (( "$#" == 0 )) ; then
	echo "Use ${BASH_SOURCE[0]} <command-like-for-ordinary-env>"
	echo "Example: "
	echo "${BASH_SOURCE[0]} \"echo '\$PKG_CONFIG_PATH' && python --version\""
else
	exec "$@"
fi