Cache version result for each pod and segments

CHANGELOG.md

@@ -15,6 +15,10 @@
 
 ##### Enhancements
 
+* Cache version result for each pod and segments  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#385](https://github.com/CocoaPods/Core/pull/385)
+
 * Introduce `test_specification` DSL  
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [Kyle Fuller](https://github.com/kylef)

lib/cocoapods-core/source.rb

@@ -24,6 +24,7 @@ class Source
     #
     def initialize(repo)
       @repo = Pathname(repo).expand_path
+      @name_to_versions_cache = {}
       refresh_metadata
     end
 
@@ -160,7 +161,8 @@ def versions(name)
       raise ArgumentError, 'No name' unless name
       pod_dir = pod_path(name)
       return unless pod_dir.exist?
-      pod_dir.children.map do |v|
+      return @name_to_versions_cache[name] if @name_to_versions_cache.key?(name)
+      @name_to_versions_cache[name] = pod_dir.children.map do |v|
         basename = v.basename.to_s
         begin
           Version.new(basename) if v.directory? && basename[0, 1] != '.'

lib/cocoapods-core/version.rb

@@ -198,11 +198,11 @@ def _segments
     end
 
     def numeric_segments
-      segments.take_while { |s| s.is_a?(Numeric) }.reverse_each.drop_while { |s| s == 0 }.reverse
+      @numeric_segments ||= segments.take_while { |s| s.is_a?(Numeric) }.reverse_each.drop_while { |s| s == 0 }.reverse
     end
 
     def prerelease_segments
-      segments.drop_while { |s| s.is_a?(Numeric) }
+      @prerelease_segments ||= segments.drop_while { |s| s.is_a?(Numeric) }
     end
 
     def compare_segments(other)