Add support for bundler dependency manager

Bundler was already around in the codebase with a Gemfile, but now it can explicitly included or excluded (default excluded). It copies the Gemfile and runs `bundle install`. It is enabled with the command line flag `--dependency-managers bundler` or in .liftoffrc: `dependency_managers: bundler`

Bundler comes first in the setup script because cocoapods can be installed via bundler.

Support bundler through the rest of the codebase

Shorten options line length

Format liftoffrc manpage

Reorder bundler in script

Bundler is used to install cocoapods so it should come first

defaults/liftoffrc

@@ -26,7 +26,6 @@ run_script_phases:
 
 templates:
   - travis.yml: .travis.yml
-  - Gemfile.rb: Gemfile
   - test.sh: bin/test
   - setup.sh: bin/setup
   - README.md: README.md

lib/liftoff.rb

@@ -12,6 +12,7 @@
 require 'liftoff/cli'
 require "liftoff/dependency_manager_coordinator"
 require "liftoff/dependency_manager"
+require "liftoff/dependency_managers/bundler"
 require "liftoff/dependency_managers/carthage"
 require "liftoff/dependency_managers/cocoapods"
 require "liftoff/dependency_managers/null_dependency_manager"

lib/liftoff/cli.rb

@@ -35,7 +35,9 @@ def global_options
           @options[:strict_prompts] = strict_prompts
         end
 
-        opts.on('--dependency-managers [NAME(s)]', 'Comma separated list of dependency managers to enable. Available options: cocoapods,carthage') do |list|
+        opts.on('--dependency-managers [NAME(s)]',
+                "Comma separated list of dependency managers to enable.\
+ Available options: cocoapods,carthage,bundler") do |list|
           @options[:dependency_managers] = (list || "").split(",")
         end
 

lib/liftoff/dependency_managers/bundler.rb

@@ -0,0 +1,32 @@
+module Liftoff
+  class Bundler < DependencyManager
+    def setup
+      if bundler_installed?
+        move_gemfile
+      else
+        puts "Please install Bundler or disable bundler from liftoff"
+      end
+    end
+
+    def install
+      if bundler_installed?
+        run_bundle_install
+      end
+    end
+
+    private
+
+    def bundler_installed?
+      system("which bundle > /dev/null")
+    end
+
+    def move_gemfile
+      FileManager.new.generate("Gemfile.rb", "Gemfile", config)
+    end
+
+    def run_bundle_install
+      puts "Running bundle install"
+      system("bundle install")
+    end
+  end
+end

lib/liftoff/launchpad.rb

@@ -124,7 +124,7 @@ def dependency_manager_coordinator
     end
 
     def dependency_managers
-      @dependency_managers ||= [cocoapods, carthage]
+      @dependency_managers ||= [cocoapods, carthage, bundler]
     end
 
     def cocoapods
@@ -142,5 +142,13 @@ def carthage
         NullDependencyManager.new(@config)
       end
     end
+
+    def bundler
+      if @config.dependency_manager_enabled?("bundler")
+        Bundler.new(@config)
+      else
+        NullDependencyManager.new(@config)
+      end
+    end
   end
 end

man/liftoffrc.5

@@ -149,17 +149,18 @@ affect the default templates. If you choose to be incorrect with your
 indentation settings, we recommend that you also override the default templates
 in order to be consistently wrong.
 .It Ic dependency_managers
-type: array 
+type: array
 .br
 default:
 .Ic cocoapods
 .Pp
 Specify the dependency managers to use.
 .Pp
 Currently, this accepts
-.Ic cocoapods
+.Ic cocoapods ,
+.Ic carthage ,
 and/or
-.Ic carthage
+.Ic bundler
 as options. For each dependency manager listed,
 .Ic liftoff
 will install the default dependency file, as well as perform any necessary
@@ -492,9 +493,10 @@ This template is installed to
 .Pa Gemfile ,
 and contains a set of default gems for use with the project. Right now, it
 contains
-.Ic CocoaPods
+.Ic XCPretty
 and
-.Ic XCPretty .
+.Ic CocoaPods
+if the cocoapods dependency manager is enabled.
 .It Pa test.sh
 This template is installed to
 .Pa bin/test

spec/dependency_managers/bundler_spec.rb

@@ -0,0 +1,70 @@
+require "spec_helper"
+
+RSpec.describe Liftoff::Bundler do
+  describe "#setup" do
+    it "checks to see if bundler is installed" do
+      system_call = "which bundle > /dev/null"
+      bundler = Liftoff::Bundler.new(:config)
+      allow(bundler).to receive(:system).with(system_call)
+
+      bundler.setup
+
+      expect(bundler).to have_received(:system).with(system_call)
+    end
+
+    context "when bundler is installed" do
+      it "asks FileManager to move the Gemfile" do
+        bundler = Liftoff::Bundler.new(:config)
+        allow(bundler).to receive(:bundler_installed?).and_return(true)
+        arguments = ["Gemfile.rb", "Gemfile", :config]
+        file_manager = double("FileManager")
+        allow(Liftoff::FileManager).to receive(:new).and_return(file_manager)
+        allow(file_manager).to receive(:generate).with(*arguments)
+
+        bundler.setup
+
+        expect(file_manager).to have_received(:generate).with(*arguments)
+      end
+    end
+
+    context "when bundler is not installed" do
+      it "puts a message out to the system" do
+        bundler = Liftoff::Bundler.new(:config)
+        output_string = "Please install Bundler or disable bundler from liftoff"
+        allow(bundler).to receive(:bundler_installed?).and_return(false)
+        allow(bundler).to receive(:puts).with(output_string)
+
+        bundler.setup
+
+        expect(bundler).to have_received(:puts).with(output_string)
+      end
+    end
+  end
+
+  describe "#install" do
+    context "if bundler is installed" do
+      it "runs bundle install" do
+        bundler = Liftoff::Bundler.new(:config)
+        allow(bundler).to receive(:bundler_installed?).and_return(true)
+        system_call = "bundle install"
+        allow(bundler).to receive(:system).with(system_call)
+
+        bundler.install
+
+        expect(bundler).to have_received(:system).with(system_call)
+      end
+    end
+
+    context "if bundler is not installed" do
+      it "does not run bundle install" do
+        bundler = Liftoff::Bundler.new(:config)
+        allow(bundler).to receive(:bundler_installed?).and_return(false)
+        allow(bundler).to receive(:system)
+
+        bundler.install
+
+        expect(bundler).not_to have_received(:system)
+      end
+    end
+  end
+end

templates/setup.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
+<% if dependency_manager_enabled?("bundler") %>
 bundle install
+<% end %>
 <% if enable_settings && dependency_manager_enabled?("cocoapods") %>
 pod install
 <% end %>