[Installer] Set SWIFT_VERSION on generated targets

CHANGELOG.md

@@ -32,6 +32,11 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Mark Schall](https://github.com/maschall)
   [#5572](https://github.com/CocoaPods/CocoaPods/pull/5572)
 
+* [Installer] Set the SWIFT_VERSION for CocoaPods generated targets.  
+  [Danielle Tomlinson](https://github.com/DanToml)
+  [#5540](https://github.com/CocoaPods/CocoaPods/pulls/5540)
+
+
 ##### Bug Fixes
 
 * Fix local pod platform conflict error message.  

Gemfile.lock

@@ -7,7 +7,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Core.git
-  revision: 628a2e908dff578db6e59b1ac6aec99b6f45cb95
+  revision: 56a87a1597533b33e7467f92429a0aded4f32ef0
   branch: master
   specs:
     cocoapods-core (1.0.1)

lib/cocoapods/installer/analyzer.rb

@@ -294,7 +294,7 @@ module Pod
           distinct_targets = specs_by_target.each_with_object({}) do |dependency, hash|
             target_definition, dependent_specs = *dependency
             dependent_specs.group_by(&:root).each do |root_spec, specs|
-              pod_variant = PodVariant.new(specs, target_definition.platform, target_definition.uses_frameworks?)
+              pod_variant = PodVariant.new(specs, target_definition.platform, target_definition.uses_frameworks?, target_definition.swift_version)
               hash[root_spec] ||= {}
               (hash[root_spec][pod_variant] ||= []) << target_definition
             end

lib/cocoapods/installer/analyzer/pod_variant.rb

@@ -16,6 +16,10 @@ module Pod
         attr_accessor :requires_frameworks
         alias_method :requires_frameworks?, :requires_frameworks
 
+        # @return [String] the Swift version
+        #
+        attr_accessor :swift_version
+
         # @return [Specification] the root specification
         #
         def root_spec
@@ -28,10 +32,11 @@ module Pod
         # @param [Platform] platform         @see #platform
         # @param [Bool] requires_frameworks  @see #requires_frameworks?
         #
-        def initialize(specs, platform, requires_frameworks = false)
+        def initialize(specs, platform, requires_frameworks = false, swift_version = nil)
           self.specs = specs
           self.platform = platform
           self.requires_frameworks = requires_frameworks
+          self.swift_version = swift_version
         end
 
         # @return [Bool] whether the {PodVariant} is equal to another taking all
@@ -41,7 +46,8 @@ module Pod
           self.class == other.class &&
             specs == other.specs &&
             platform == other.platform &&
-            requires_frameworks == other.requires_frameworks
+            requires_frameworks == other.requires_frameworks &&
+            swift_version == other.swift_version
         end
         alias_method :eql?, :==
 
@@ -51,7 +57,7 @@ module Pod
         #
         # @!visibility private
         def hash
-          [specs, platform, requires_frameworks].hash
+          [specs, platform, requires_frameworks, swift_version].hash
         end
       end
     end

lib/cocoapods/installer/analyzer/target_inspector.rb

@@ -44,6 +44,7 @@ module Pod
           result.platform = compute_platform(targets)
           result.archs = compute_archs(targets)
           result.project = user_project
+          result.target_definition.swift_version = compute_swift_version_from_targets(targets)
           result
         end
 
@@ -205,6 +206,29 @@ module Pod
             end
           end
         end
+
+        # Compute the Swift version for the target build configurations. If more
+        # than one Swift version is defined for a given target, then it will raise.
+        #
+        # @param  [Array<PBXNativeTarget>] targets
+        #         the targets that are checked for Swift versions.
+        #
+        # @return [String] the targets Swift version or nil
+        #
+        def compute_swift_version_from_targets(targets)
+          versions = targets.flat_map(&:build_configurations).
+            flat_map { |config| config.build_settings['SWIFT_VERSION'] }.
+            compact.
+            uniq
+          case versions.count
+          when 0
+            nil
+          when 1
+            versions.first
+          else
+            raise Informative, 'There may only be up to 1 unique SWIFT_VERSION per target.'
+          end
+        end
       end
     end
   end

lib/cocoapods/installer/xcode/pods_project_generator.rb

@@ -108,7 +108,6 @@ module Pod
         def prepare
           UI.message '- Creating Pods project' do
             @project = create_project
-
             analysis_result.all_user_build_configurations.each do |name, type|
               @project.add_build_configuration(name, type)
             end

lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb

@@ -55,6 +55,9 @@ module Pod
               settings['PUBLIC_HEADERS_FOLDER_PATH'] = ''
             end
             settings['CODE_SIGN_IDENTITY[sdk=iphoneos*]'] = ''
+            if target.swift_version
+              settings['SWIFT_VERSION'] = target.swift_version
+            end
             settings
           end
 

lib/cocoapods/target/pod_target.rb

@@ -81,6 +81,12 @@ module Pod
       end
     end
 
+    # @return [String] the Swift version for the target.
+    #
+    def swift_version
+      target_definitions.map(&:swift_version).compact.uniq.first
+    end
+
     # @note   The deployment target for the pod target is the maximum of all
     #         the deployment targets for the current platform of the target
     #         (or the minimum required to support the current installation

spec/unit/installer/analyzer/pod_variant_spec.rb

@@ -12,6 +12,7 @@ module Pod
       variant.specs.should == @specs
       variant.platform.should == @platform
       variant.requires_frameworks.should == false
+      variant.swift_version.should.nil?
     end
 
     it 'can be initialized with specs, platform and whether it requires frameworks' do
@@ -19,6 +20,15 @@ module Pod
       variant.specs.should == @specs
       variant.platform.should == @platform
       variant.requires_frameworks.should == true
+      variant.swift_version.should.nil?
+    end
+
+    it 'can be initialized with specs, platform, whether it requires frameworks, and a Swift version' do
+      variant = PodVariant.new(@specs, @platform, true, '2.3')
+      variant.specs.should == @specs
+      variant.platform.should == @platform
+      variant.requires_frameworks.should == true
+      variant.swift_version.should == '2.3'
     end
 
     it 'can return the root spec' do
@@ -27,11 +37,12 @@ module Pod
       variant.root_spec.should == spec
     end
 
-    it 'can be compared for equality with another variant with the same specs, platform and value for whether it requires frameworks' do
-      spec = PodVariant.new(@specs, @platform, false)
-      spec.should == PodVariant.new(@specs, @platform, false)
+    it 'can be compared for equality with another variant with the same specs, platform, value for whether it requires frameworks and Swift version' do
+      spec = PodVariant.new(@specs, @platform, false, '2.3')
+      spec.should == PodVariant.new(@specs, @platform, false, '2.3')
+      spec.should.not == PodVariant.new(@specs, @platform, false, '3.0')
       spec.should.not == PodVariant.new([@specs.first], @platform, false)
-      spec.should.not == PodVariant.new(@specs, Platform.osx, false)
+      spec.should.not == PodVariant.new(@specs, Platform.osx, false, '2.3')
       spec.should.not == PodVariant.new(@specs, @platform, true)
     end
 

spec/unit/installer/analyzer/target_inspector_spec.rb

@@ -284,5 +284,48 @@ module Pod
           message.should.include('Unable to determine the platform for the `default` target.')
       end
     end
+
+    #--------------------------------------#
+
+    describe '#compute_swift_version_from_targets' do
+      it 'returns the user defined SWIFT_VERSION if only one unique version is defined' do
+        user_project = Xcodeproj::Project.new('path')
+        target = user_project.new_target(:application, 'Target', :ios)
+        target.build_configuration_list.set_setting('SWIFT_VERSION', '2.3')
+
+        target_definition = Podfile::TargetDefinition.new(:default, nil)
+        user_targets = [target]
+
+        target_inspector = TargetInspector.new(target_definition, config.installation_root)
+        target_inspector.send(:compute_swift_version_from_targets, user_targets).should.equal '2.3'
+      end
+
+      it 'returns nil if the version is not defined' do
+        user_project = Xcodeproj::Project.new('path')
+        target = user_project.new_target(:application, 'Target', :ios)
+        target.build_configuration_list.set_setting('SWIFT_VERSION', nil)
+
+        target_definition = Podfile::TargetDefinition.new(:default, nil)
+        user_targets = [target]
+
+        target_inspector = TargetInspector.new(target_definition, config.installation_root)
+        target_inspector.send(:compute_swift_version_from_targets, user_targets).should.equal nil
+      end
+
+      it 'raises if the user defined SWIFT_VERSION contains multiple unique versions are defined' do
+        user_project = Xcodeproj::Project.new('path')
+        target = user_project.new_target(:application, 'Target', :ios)
+        target.build_configuration_list.build_configurations.first.build_settings['SWIFT_VERSION'] = '2.3'
+        target.build_configuration_list.build_configurations.last.build_settings['SWIFT_VERSION'] = '3.0'
+
+        target_definition = Podfile::TargetDefinition.new(:default, nil)
+        user_targets = [target]
+
+        target_inspector = TargetInspector.new(target_definition, config.installation_root)
+        should.raise(Informative) do
+          target_inspector.send(:compute_swift_version_from_targets, user_targets)
+        end.message.should.include 'There may only be up to 1 unique SWIFT_VERSION per target.'
+      end
+    end
   end
 end

spec/unit/installer/xcode/pods_project_generator/pod_target_installer_spec.rb

@@ -113,6 +113,25 @@ module Pod
 
             #--------------------------------------#
 
+            describe 'setting the SWIFT_VERSION' do
+              it 'does not set the version if not included by the target definition' do
+                @installer.install!
+                @project.targets.first.build_configurations.each do |config|
+                  config.build_settings.should.not.include?('SWIFT_VERSION')
+                end
+              end
+
+              it 'sets the version to the one specified in the target definition' do
+                @target_definition.swift_version = '3.0'
+                @installer.install!
+                @project.targets.first.build_configurations.each do |config|
+                  config.build_settings['SWIFT_VERSION'].should == '3.0'
+                end
+              end
+            end
+
+            #--------------------------------------#
+
             it 'adds the source files of each pod to the target of the Pod library' do
               @installer.install!
               names = @installer.target.native_target.source_build_phase.files.map { |bf| bf.file_ref.display_name }