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

PYENV_VERSION_FILE="$1"
PYENV_VERSION="$2"

if [ -z "$PYENV_VERSION" ] || [ -z "$PYENV_VERSION_FILE" ]; then
  echo "usage: pyenv write-version-file FILENAME VERSION" >&2
  exit 1
fi

# Make sure the specified version is installed.
pyenv-prefix "$PYENV_VERSION" >/dev/null

# Write the version out to disk.
echo "$PYENV_VERSION" > "$PYENV_VERSION_FILE"