Implement rbenv-uninstall command

#!/usr/bin/env bash

set -e

# Provide rbenv completions

if [ "$1" = "--complete" ]; then

  exec ruby-build --definitions

fi

if [ -z "$RBENV_ROOT" ]; then

  RBENV_ROOT="${HOME}/.rbenv"

fi

DEFINITION="$1"

case "$DEFINITION" in

"" | -* )

  { echo "usage: rbenv uninstall VERSION"

    echo "       rbenv uninstall /path/to/definition"

    echo

    if [ -n `which rbenv` ]; then

      echo "Available versions:"

      rbenv versions | sed 's/^/  /'

      echo

    fi

  } >&2

  exit 1

  ;;

esac

VERSION_NAME="${DEFINITION##*/}"

PREFIX="${RBENV_ROOT}/versions/${VERSION_NAME}"

if [ ! -e "$PREFIX" ]; then

  echo "Given version ($VERSION_NAME) is not installed"

  exit 1

fi

rm -rf "$PREFIX"

rbenv rehash