Add Carthage support

Added carthage as a dependency manager.

What it does:

- Adds an empty `Cartfile`
- Runs `carthage update`
- Adds the `copy-frameworks.sh` build phase to the project
- Adds `carthage update` to `bin/setup` script

lib/liftoff.rb

@@ -11,6 +11,7 @@
 require 'liftoff/cli'
 require "liftoff/dependency_manager_coordinator"
 require "liftoff/dependency_manager"
+require "liftoff/dependency_managers/carthage"
 require "liftoff/dependency_managers/cocoapods"
 require "liftoff/dependency_managers/null_dependency_manager"
 require 'liftoff/settings_generator'

lib/liftoff/cli.rb

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

lib/liftoff/dependency_managers/carthage.rb

@@ -0,0 +1,41 @@
+module Liftoff
+  class Carthage < DependencyManager
+    def setup
+      if carthage_installed?
+        move_cartfile
+      else
+        puts 'Please install Carthage or disable carthage from liftoff'
+      end
+    end
+
+    def install
+      if carthage_installed?
+        run_carthage_update
+      end
+    end
+
+    def run_script_phases
+      [
+        {
+          "file" => "copy_frameworks.sh",
+          "name" => "Copy framworks (Carthage)",
+        }
+      ]
+    end
+
+    private
+
+    def carthage_installed?
+      system('which carthage > /dev/null')
+    end
+
+    def move_cartfile
+      FileManager.new.generate('Cartfile', 'Cartfile', @config)
+    end
+
+    def run_carthage_update
+      puts 'Running carthage update'
+      system('carthage update')
+    end
+  end
+end

lib/liftoff/launchpad.rb

@@ -16,7 +16,7 @@ def liftoff(options)
           setup_dependency_managers
           generate_templates
           generate_settings
-          install_dependency_managers
+          install_dependencies
           perform_project_actions
           open_project
         end
@@ -51,7 +51,7 @@ def setup_dependency_managers
       dependency_manager_coordinator.setup_dependencies
     end
 
-    def install_dependency_managers
+    def install_dependencies
       dependency_manager_coordinator.install_dependencies
     end
 
@@ -124,7 +124,7 @@ def dependency_manager_coordinator
     end
 
     def dependency_managers
-      @dependency_managers ||= [cocoapods]
+      @dependency_managers ||= [cocoapods, carthage]
     end
 
     def cocoapods
@@ -134,5 +134,13 @@ def cocoapods
         NullDependencyManager.new(@config)
       end
     end
+
+    def carthage
+      if @config.dependency_manager_enabled?("carthage")
+        Carthage.new(@config)
+      else
+        NullDependencyManager.new(@config)
+      end
+    end
   end
 end

templates/Gemfile.rb

@@ -1,4 +1,6 @@
 source 'https://rubygems.org'
 
+<% if enable_settings && dependency_manager_enabled?("cocoapods") %>
 gem 'cocoapods'
+<% end %>
 gem 'xcpretty'

templates/copy_frameworks.sh

@@ -0,0 +1 @@
+/usr/local/bin/carthage copy-frameworks

templates/gitignore

@@ -26,6 +26,7 @@ build/
 
 # Cocoapods
 Pods
+Carthage
 
 # AppCode specific files
 .idea/

templates/setup.sh

@@ -1,4 +1,9 @@
 #!/usr/bin/env bash
 
 bundle install
+<% if enable_settings && dependency_manager_enabled?("cocoapods") %>
 pod install
+<% end %>
+<% if dependency_manager_enabled?("carthage") %>
+carthage update
+<% end %>