#!/usr/bin/env bash
#
# Summary: List all Python virtualenvs found in `$PYENV_ROOT/versions/*'.
#
# Usage: pyenv virtualenvs [--bare]
#

set -e
[ -n "$PYENV_DEBUG" ] && set -x

if [ -z "$PYENV_ROOT" ]; then
  PYENV_ROOT="${HOME}/.pyenv"
fi

if [ "$1" = "--bare" ]; then
  hit_prefix=""
  miss_prefix=""
  current_versions=()
  unset print_origin
else
  hit_prefix="* "
  miss_prefix="  "
  current_versions=($(IFS=:; for version in $(pyenv-version-name); do echo "$version"; done))
  print_origin="1"
fi

exists() {
  local car="$1"
  local cdar
  shift
  for cdar in "$@"; do
    if [ "${car}" == "${cdar}" ]; then
      return 0
    fi
  done
  return 1
}

print_version() {
  if exists "$1" "${current_versions[@]}"; then
    echo "${hit_prefix}${1}${print_origin+$2}"
  else
    echo "${miss_prefix}${1}${print_origin+$2}"
  fi
}

shopt -s nullglob
for path in "${PYENV_ROOT}/versions/"*; do
  version="${path##*/}"
  virtualenv_prefix="$(pyenv-virtualenv-prefix "${version}" 2>/dev/null || true)"
  if [ -d "${virtualenv_prefix}" ]; then
    print_version "${version}" " (created from ${virtualenv_prefix})"
  fi
  for venv_path in "${path}/envs/"*; do
    venv_version="${version}/envs/${venv_path##*/}"
    virtualenv_prefix="$(pyenv-virtualenv-prefix "${venv_version}" 2>/dev/null || true)"
    if [ -d "${virtualenv_prefix}" ]; then
      print_version "${venv_version}" " (created from ${virtualenv_prefix})"
    fi
  done
done
shopt -u nullglob