`stibium-bundled`

This gem is intended to mimic Bundler's behavior and conform to bundler configuration options.

stibium-bundled detects gems.rb and gems.locked (or Gemfile and Gemfile.lock) and bundler/setup (for standalone installation).

standalone makes a bundle that can work without depending on Bundler (or Rubygems) at runtime. Bundler generates a bundler/setup.rb file to replace Bundler's own setup in the manner required.

Configuration settings are loaded in this order:

Local config (.bundle/config or "$BUNDLE_APP_CONFIG/config)
Environment variables (ENV)
Global config (~/.bundle/config)
Default config

Sample of use

# file: lib/awesome_gem.rb

require 'stibium/bundled'

module AwesomeGem
  include(Stibium::Bundled)

  self.bundled_from("#{__dir__}/..", setup: true)
end

or more concise:

# file: lib/awesome_gem.rb

require 'stibium/bundled'

module AwesomeGem
  include(Stibium::Bundled).bundled_from("#{__dir__}/..", setup: true)
end

or load a gem depending on status:

# file: lib/awesome_gem.rb

require 'stibium/bundled'

module AwesomeGem
  include(Stibium::Bundled).bundled_from("#{__dir__}/..", setup: true) do |bundle|
    if Object.const_defined?(:Gem) and bundle.locked? and bundle.installed?
      'foo-bar'.tap do |gem_name|
        unless bundle.specifications.keep_if { |spec| spec.name == gem_name }.empty?
          require gem_name.gsub('-', '/')
        end
      end
    end
  end
end

if stibium-bundled is not system wide installed, it can be necessary to locate it:

# file: lib/awesome_gem.rb

autoload(:Pathname, 'pathname')
autoload(:RbConfig, 'rbconfig')

module AwesomeGem
  Pathname.new("#{__dir__}/..").expand_path.yield_self do |basedir|
    begin
      require 'stibium/bundled'
    rescue LoadError
      [
        [RUBY_ENGINE, RbConfig::CONFIG.fetch('ruby_version'), 'bundler/gems/*/stibium-bundled.gemspec'],
        [RUBY_ENGINE, RbConfig::CONFIG.fetch('ruby_version'), 'gems/stibium-bundled-*/lib/'],
      ].map { |parts| basedir.join(*['{**/,}bundle'].concat(parts)) }.yield_self do |patterns|
        Pathname.glob(patterns).first&.dirname.tap { |gem_dir| require gem_dir.join('lib/stibium/bundled') }
      end
    end

    include(::Stibium::Bundled).bundled_from(basedir, setup: true) do |bundle|
      if bundle.locked? and bundle.installed? and Object.const_defined?(:Gem)
        require 'fabulous/feature' if bundle.specifications.keep_if { |s| s.name == 'fabulous' }.any?
      end
    end
  end
end

Benchmarks

Using Stibium::Bundled setup leads to minor overhead compared to direct require for bundler/setup, on the other hand Stibium::Bundled setup is compatible with standalone's bundler setup without code change. And bundle exec is known to be slow.

Install hypefine and run benchmarks:

rake bench runs=20

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`bundler/setup`	205.7 ± 7.1	200.1	232.5	1.00 ± 0.05
`bundled`	205.7 ± 6.2	196.8	222.4	1.00
`bundle exec`	559.4 ± 13.0	543.2	587.8	2.72 ± 0.10

Install

bundle config set --local clean 'true'
bundle config set --local path 'vendor/bundle'
bundle install --standalone