pyenv/libexec/pyenv-local

#!/usr/bin/env bash
set -e
[ -n "$PYENV_DEBUG" ] && set -x

# Provide pyenv completions
if [ "$1" = "--complete" ]; then
  echo --unset
  echo system
  exec pyenv-versions --bare
fi

versions=($@)
PYENV_VERSION_FILE=".pyenv-version"

if [ "$versions" = "--unset" ]; then
  rm -f "$PYENV_VERSION_FILE"
elif [ -n "$versions" ]; then
  pyenv-version-file-write "$PYENV_VERSION_FILE" "${versions[@]}"
else
  IFS=: versions=($(
    pyenv-version-file-read "$PYENV_VERSION_FILE" ||
    { echo "pyenv: no local version configured for this directory"
      exit 1
    } >&2
  ))
  for version in "${versions[@]}"; do
    echo "$version"
  done
fi