Merge pull request #3440 from segiddins/seg-inline

[Inline] Add bundler/inline to allow using Bundler without a Gemfile

lib/bundler/inline.rb

@@ -0,0 +1,50 @@
+# 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, &gemfile)
+  require 'bundler'
+  old_root = Bundler.method(:root)
+  def Bundler.root
+    Pathname.pwd.expand_path
+  end
+  ENV['BUNDLE_GEMFILE'] ||= 'Gemfile'
+
+  builder = Bundler::Dsl.new
+  builder.instance_eval(&gemfile)
+  definition = builder.to_definition(nil, true)
+  def definition.lock(file); end
+  definition.validate_ruby!
+  Bundler::Installer.install(Bundler.root, definition, :system => true) if install
+  runtime = Bundler::Runtime.new(nil, definition)
+  runtime.setup_environment
+  runtime.setup.require
+
+  bundler_module = class << Bundler; self; end
+  bundler_module.send(:define_method, :root, old_root)
+end

spec/runtime/inline_spec.rb

@@ -0,0 +1,88 @@
+require "spec_helper"
+
+describe "bundler/inline#gemfile" do
+  def script(code, options = {})
+    @out = ruby("require 'bundler/inline'\n\n" << code, options)
+  end
+
+  before :each do
+    build_lib "one", "1.0.0" do |s|
+      s.write "lib/baz.rb", "puts 'baz'"
+      s.write "lib/qux.rb", "puts 'qux'"
+    end
+
+    build_lib "two", "1.0.0" do |s|
+      s.write "lib/two.rb", "puts 'two'"
+      s.add_dependency "three", "= 1.0.0"
+    end
+
+    build_lib "three", "1.0.0" do |s|
+      s.write "lib/three.rb", "puts 'three'"
+      s.add_dependency "seven", "= 1.0.0"
+    end
+
+    build_lib "four", "1.0.0" do |s|
+      s.write "lib/four.rb", "puts 'four'"
+    end
+
+    build_lib "five", "1.0.0", :no_default => true do |s|
+      s.write "lib/mofive.rb", "puts 'five'"
+    end
+
+    build_lib "six", "1.0.0" do |s|
+      s.write "lib/six.rb", "puts 'six'"
+    end
+
+    build_lib "seven", "1.0.0" do |s|
+      s.write "lib/seven.rb", "puts 'seven'"
+    end
+
+    build_lib "eight", "1.0.0" do |s|
+      s.write "lib/eight.rb", "puts 'eight'"
+    end
+
+    build_lib "four", "1.0.0" do |s|
+      s.write "lib/four.rb", "puts 'four'"
+    end
+
+    @gemfile = <<-G
+      path "#{lib_path}"
+      gem "two"
+      gem "four", :require => false
+    G
+  end
+
+  it "requires the gems" do
+    script <<-RUBY
+      gemfile do
+        path "#{lib_path}"
+        gem "two"
+      end
+    RUBY
+
+    expect(out).to eq("two")
+    expect(exitstatus).to be_zero if exitstatus
+
+    script <<-RUBY, :expect_err => true
+      gemfile do
+        path "#{lib_path}"
+        gem "eleven"
+      end
+
+      puts "success"
+    RUBY
+
+    expect(err).to include "Could not find gem 'eleven (>= 0) ruby'"
+    expect(out).not_to include "success"
+
+    script <<-RUBY
+      gemfile(true) do
+        source "file://#{gem_repo1}"
+        gem "rack"
+      end
+    RUBY
+
+    expect(out).to eq("Rack's post install message")
+    expect(exitstatus).to be_zero if exitstatus
+  end
+end