1 files changed, 76 insertions, 0 deletions
diff --git a/lib/bundler/inline.rb b/lib/bundler/inline.rb
new file mode 100644
index 0000000000..38dcda6b5b
--- /dev/null
+++ b/lib/bundler/inline.rb
@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+# Allows for declaring a Gemfile inline in a ruby script, optionally installing
+# any gems that aren't already installed on the user's system.
+#
+# @note Every gem that is specified in this 'Gemfile' will be `require`d, as if
+#       the user had manually called `Bundler.require`. To avoid a requested gem
+#       being automatically required, add the `:require => false` option to the
+#       `gem` dependency declaration.
+#
+# @param install [Boolean] whether gems that aren't already installed on the
+#                          user's system should be installed.
+#                          Defaults to `false`.
+#
+# @param gemfile [Proc]    a block that is evaluated as a `Gemfile`.
+#
+# @example Using an inline Gemfile
+#
+#          #!/usr/bin/env ruby
+#
+#          require 'bundler/inline'
+#
+#          gemfile do
+#            source 'https://rubygems.org'
+#            gem 'json', require: false
+#            gem 'nap', require: 'rest'
+#            gem 'cocoapods', '~> 0.34.1'
+#          end
+#
+#          puts Pod::VERSION # => "0.34.4"
+#
+def gemfile(install = false, options = {}, &gemfile)
+  require "bundler"
+
+  opts = options.dup
+  ui = opts.delete(:ui) { Bundler::UI::Shell.new }
+  raise ArgumentError, "Unknown options: #{opts.keys.join(", ")}" unless opts.empty?
+
+  old_root = Bundler.method(:root)
+  def Bundler.root
+    Bundler::SharedHelpers.pwd.expand_path
+  end
+  ENV["BUNDLE_GEMFILE"] = "Gemfile"
+
+  Bundler::Plugin.gemfile_install(&gemfile) if Bundler.feature_flag.plugins?
+  builder = Bundler::Dsl.new
+  builder.instance_eval(&gemfile)
+
+  definition = builder.to_definition(nil, true)
+  def definition.lock(*); end
+  definition.validate_runtime!
+
+  missing_specs = proc do
+    begin
+      !definition.missing_specs.empty?
+    rescue Bundler::GemNotFound, Bundler::GitError
+      definition.instance_variable_set(:@index, nil)
+      true
+    end
+  end
+
+  Bundler.ui = ui if install
+  if install || missing_specs.call
+    Bundler.settings.temporary(:inline => true) do
+      installer = Bundler::Installer.install(Bundler.root, definition, :system => true)
+      installer.post_install_messages.each do |name, message|
+        Bundler.ui.info "Post-install message from #{name}:\n#{message}"
+      end
+    end
+  end
+
+  runtime = Bundler::Runtime.new(nil, definition)
+  runtime.setup.require
+ensure
+  bundler_module = class << Bundler; self; end
+  bundler_module.send(:define_method, :root, old_root) if old_root
+end