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Did you know that you can use Bundler without Gemfile?

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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'
end


###


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
end

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:

<snippet>
  <content><![CDATA[
require 'bundler/inline'


gemfile do
  source 'https://rubygems.org'
end
]]></content>
  <tabTrigger>bun</tabTrigger>
  <scope>source.ruby</scope>
</snippet>

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.