#!/usr/bin/env bash
set -e

prefix="$1"
if [ -z "$prefix" ]; then
  echo "usage: ruby-package-install PREFIX" >&2
  exit 1
fi

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"
}

bin_root="$(abs_dirname "$0")"
package_root="${bin_root}/.."
package_prefix="$(cat "${package_root}/metadata/prefix")"
package="$(cat "${package_root}/metadata/package")"

mkdir -p "$prefix"
cd "$prefix"
prefix="$(pwd)"

rewrite() {
  kind="$1"
  while read file; do
    path="${prefix}/$file"
    cp "$path" "${path}.orig"
    "${bin_root}/ruby-package-rewrite-$kind" "$package_prefix" "$prefix" < "${path}.orig" > "$path"
    rm "${path}.orig"
  done < "${package_root}/metadata/${kind}-files"
}

tar xzf "${package_root}/package.tar"
rewrite binary
rewrite text