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

resolve_link() {
  $(type -p greadlink readlink | head -1) $1
}

abs_dirname() {
  local cwd="$(pwd)"
  local path="$1"

  while [ -n "$path" ]; do
    cd "${path%/*}"
    local name="${path##*/}"
    path="$(resolve_link "$name" || true)"
  done

  pwd
  cd "$cwd"
}

usage() {
  { echo "usage: rbenv install [--build | --package] VERSION"
    echo "       rbenv install /path/to/definition"
    echo
    echo "Available versions:"
    ruby-build --definitions | sed 's/^/  /'
    echo
  } >&2
  exit 1
}

bin_dir="$(abs_dirname "$0")"
export PATH="${bin_dir}:$PATH"

# Provide rbenv completions
if [ "$1" = "--complete" ]; then
  exec ruby-build --definitions
fi

force_build=""
force_package=""
if [ "$1" = "--build" ]; then
  force_build=1
  shift
elif [ "$1" = "--package" ]; then
  force_package=1
  shift
fi

definition="$1"
case "$definition" in
"" | -* )
  usage
  ;;
esac

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

version_name="${definition##*/}"
prefix="${RBENV_ROOT}/versions/${version_name}"

package() {
  ruby-package install $* "$definition" "$prefix"
}

build() {
  ruby-build "$definition" "$prefix"
}

if [ -n "$force_build" ]; then
  build
elif [ -n "$force_package" ]; then
  package
else
  package --fail-silently || build
fi

rbenv rehash