[#201] Added support for CocoaPods-version.txt

lib/cocoapods.rb

 Encoding.default_external = Encoding::UTF_8 if RUBY_VERSION > '1.8.7'
 
 module Pod
-  VERSION = '0.5.1'
+  VERSION = '0.6.0.a'
 
   class Informative < StandardError
   end

lib/cocoapods/command.rb

@@ -65,9 +65,23 @@ module Pod
     end
 
     def self.run(*argv)
+      bin_version = Gem::Version.new(VERSION)
+      last_version = bin_version
+      Source.all.each { |source|
+        file = source.repo + 'CocoaPods-version.txt'
+        next unless file.exist?
+        repo_min_version  = Gem::Version.new(YAML.load_file(file)[:min])
+        repo_last_version = Gem::Version.new(YAML.load_file(file)[:last])
+        last_version = repo_last_version if repo_last_version && repo_last_version > last_version
+        if repo_min_version > bin_version
+          raise Informative, "\n[!] The repo `#{source}' requires CocoaPods version #{repo_version}\n".red +
+            "\nPlease, update your gem\n\n"
+        end
+      }
+      puts "\n-> Cocoapods #{last_version} is available \n".green.reversed if last_version > bin_version
+
       Setup.new(ARGV.new).run_if_needed
       parse(*argv).run
-
     rescue Interrupt
       puts "[!] Cancelled".red
       Config.instance.verbose? ? raise : exit(1)

lib/cocoapods/source.rb

@@ -83,5 +83,9 @@ module Pod
         set if text.downcase.include?(query.downcase)
       end.compact
     end
+
+    def to_s
+      @repo.basename.to_s
+    end
   end
 end