Did you know that you can use Bundler without Gemfile?

Did you know that you can use Bundler inside single Ruby script (without Gemfile) and automatically install required dependencies for it?

# example.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'rest-client'
  gem 'nokogiri'


body = RestClient.get("https://www.reddit.com/r/ruby/").body

puts "Posts from r/ruby front page:"
Nokogiri::HTML(body).xpath("//div[contains(@class, 'scrollerItem')]//h2").each do |h2|
  puts h2.text.strip

Run ruby example.rb (without bundle exec), and enjoy!

This is a nice feature that I wasn’t aware of. Best to use for small scripts and quick sketches.

Bonus: use Sublime Text snippet to paste bundler inline code block using tab trigger:

1. Open Tools > Developer > New Snippet

2. Paste following code into the snippet file:

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

3. Save snippet (ctrl+s). Now try to open a new empty file with .rb extension and type bun + Tab key. Bundle inline block template will be pasted into the file.