Add color indication to output of "pod outdated"

CHANGELOG.md

@@ -8,6 +8,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 ##### Enhancements
 
+* Add color indication to output of `pod outdated`  
+  [iv-mexx](https://github.com/iv-mexx)
+  [#7204](https://github.com/CocoaPods/CocoaPods/pull/7204)
+
 * Add support for editing the podspec, license, README, license, and docs of local development pods  
   [Eric Amorde](https://github.com/amorde)
   [#7093](https://github.com/CocoaPods/CocoaPods/pull/7093)

lib/cocoapods/command/outdated.rb

@@ -22,10 +22,24 @@ module Pod
         if updates.empty?
           UI.puts 'No pod updates are available.'.yellow
         else
+          UI.section 'The color indicates what happens when you run `pod update`' do
+            UI.puts "#{'<green>'.green}\t\t - Will be updated to the newest version"
+            UI.puts "#{'<yellow>'.yellow}\t - Will be updated, but not to the newest version because of specified version in Podfile"
+            UI.puts "#{'<red>'.red}\t\t - Will not be updated because of specified version in Podfile"
+            UI.puts ''
+          end
           UI.section 'The following pod updates are available:' do
             updates.each do |(name, from_version, matching_version, to_version)|
-              UI.puts "- #{name} #{from_version} -> #{matching_version} " \
-                "(latest version #{to_version})"
+              color = :yellow
+              if matching_version == to_version
+                color = :green
+              elsif from_version == matching_version
+                color = :red
+              end
+              # For the specs, its necessary that to_s is called here even though it is redundant
+              # https://github.com/CocoaPods/CocoaPods/pull/7204#issuecomment-342512015
+              UI.puts "- #{name} #{from_version.to_s.send(color)} -> #{matching_version.to_s.send(color)} " \
+              "(latest version #{to_version.to_s})" # rubocop:disable Lint/StringConversionInInterpolation
             end
           end
         end

spec/functional/command/outdated_spec.rb

 require File.expand_path('../../../spec_helper', __FILE__)
-
 module Pod
   describe Command::Outdated do
     extend SpecHelper::TemporaryRepos
@@ -39,6 +38,65 @@ module Pod
       UI.output.should.not.include('UIKit')
     end
 
+    it 'tells the user about outdated pods that can be updated in green' do
+      pod_name = 'BlocksKit'
+
+      current_version_string = mock
+      current_version_string.expects(:green).returns('1.0').once
+      current_version = mock
+      current_version.stubs(:to_s).returns(current_version_string)
+
+      newest_version_string = mock
+      newest_version_string.stubs(:to_s).returns('2.0')
+      newest_version_string.expects(:green).returns('2.0').once
+      newest_version = mock
+      newest_version.stubs(:to_s).returns(newest_version_string)
+      Command::Outdated.any_instance.stubs(:updates).returns([[pod_name, current_version, newest_version, newest_version]])
+      Command::Outdated.any_instance.stubs(:deprecated_pods).returns([])
+
+      run_command('outdated')
+      UI.output.should.include('BlocksKit 1.0 -> 2.0 (latest version 2.0)')
+    end
+
+    it 'tells the user about outdated pods that can not be updated due to version restriction in red' do
+      pod_name = 'BlocksKit'
+
+      version_string = mock
+      version_string.expects(:red).returns('1.0').twice
+      current_version = mock
+      current_version.stubs(:to_s).returns(version_string)
+
+      newest_version = mock
+      newest_version.stubs(:to_s).returns('2.0')
+      Command::Outdated.any_instance.stubs(:updates).returns([[pod_name, current_version, current_version, newest_version]])
+      Command::Outdated.any_instance.stubs(:deprecated_pods).returns([])
+
+      run_command('outdated')
+      UI.output.should.include('BlocksKit 1.0 -> 1.0 (latest version 2.0)')
+    end
+
+    it 'tells the user about outdated pods that can be updated, but not to the latest version in yellow' do
+      pod_name = 'BlocksKit'
+
+      current_version_string = mock
+      current_version_string.expects(:yellow).returns('1.0').once
+      current_version = mock
+      current_version.stubs(:to_s).returns(current_version_string)
+
+      next_version_string = mock
+      next_version_string.expects(:yellow).returns('1.1').once
+      next_version = mock
+      next_version.stubs(:to_s).returns(next_version_string)
+
+      newest_version = mock
+      newest_version.stubs(:to_s).returns('2.0')
+      Command::Outdated.any_instance.stubs(:updates).returns([[pod_name, current_version, next_version, newest_version]])
+      Command::Outdated.any_instance.stubs(:deprecated_pods).returns([])
+
+      run_command('outdated')
+      UI.output.should.include('BlocksKit 1.0 -> 1.1 (latest version 2.0)')
+    end
+
     it 'tells the user about deprecated pods' do
       spec = Specification.new(nil, 'AFNetworking')
       spec.deprecated_in_favor_of = 'BlocksKit'