#!/bin/bash
# Sets up rbenv and the project's Ruby. Safe to run every launch — it only does
# real work the first time, or when the Ruby version changes.
set -euo pipefail

# Grab rbenv (cloned into the home folder so it sticks around between runs).
if [ ! -d "$RBENV_ROOT/bin" ]; then
  echo "[ruby] installing rbenv..."
  git clone --depth=1 https://github.com/rbenv/rbenv.git "$RBENV_ROOT"
  git clone --depth=1 https://github.com/rbenv/ruby-build.git "$RBENV_ROOT/plugins/ruby-build"
fi
eval "$(rbenv init - bash)"

# Pick the Ruby version: the project's .ruby-version wins, then whatever rbenv
# was last set to, then a sensible default.
if [ -f /code/.ruby-version ]; then
  RUBY_VERSION="$(tr -d '[:space:]' < /code/.ruby-version)"
elif [ -f "$RBENV_ROOT/version" ]; then
  RUBY_VERSION="$(cat "$RBENV_ROOT/version")"
else
  RUBY_VERSION="3.3.6"
fi

if ! rbenv versions --bare 2>/dev/null | grep -qx "$RUBY_VERSION"; then
  echo "[ruby] installing Ruby $RUBY_VERSION (first time only — takes a few minutes)..."
  rbenv install "$RUBY_VERSION"
fi
rbenv global "$RUBY_VERSION"

# Make sure bundler is installed for this Ruby.
gem list bundler -i &>/dev/null || gem install bundler --no-document