Adding `pod cache list` command. #3508

First draft, Still WIP (TODO = Add specs + add `pod cache clean` command)

lib/cocoapods/command.rb

@@ -24,6 +24,7 @@ module Pod
     require 'cocoapods/command/setup'
     require 'cocoapods/command/spec'
     require 'cocoapods/command/init'
+    require 'cocoapods/command/cache'
 
     self.abstract_command = true
     self.command = 'pod'

lib/cocoapods/command/cache.rb

+require 'cocoapods/downloader'
+
+module Pod
+  class Command
+    class Cache < Command
+      self.abstract_command = true
+      self.summary = 'Manipulate the CocoaPods cache'
+
+      self.description = <<-DESC
+        Manipulate the download cache for pods, like printing the cache content
+        or cleaning the pods cache.
+      DESC
+
+      class List < Cache
+        self.summary = 'List the paths of pod caches for each known pod'
+
+        self.description = <<-DESC
+          Shows the content of cache organized by pod.
+          If `NAME` is given, show the results only for that pod name.
+        DESC
+
+        self.arguments = [
+          CLAide::Argument.new('NAME', false),
+        ]
+
+        def initialize(argv)
+          @podname = argv.shift_argument
+          @cache_root = Config.instance.cache_root + 'Pods'
+          super
+        end
+
+
+        def run
+          if (@podname.nil?)
+            cache_hash.each do |pod, list|
+              UI.title pod
+              print_pod_cache_list(list)
+            end
+          else
+            cache_list = cache_hash[@podname]
+            if cache_list.nil?
+              UI.notice("No cache for pod named #{@podname} found")
+            else
+              print_pod_cache_list(cache_list)
+            end
+          end
+        end
+
+        private
+
+        def print_pod_cache_list(list)
+          list.each do |spec_file, request|
+            type = request.released_pod? ? 'Release' : 'External'
+            UI.section("#{request.spec.version} (#{type})") do
+              UI.labeled('Spec', spec_file)
+              UI.labeled('Pod', @cache_root+request.slug)
+            end
+          end
+        end
+
+        def cache_hash
+          specs_dir = @cache_root + 'Specs'
+          spec_files = specs_dir.find.select { |f| f.fnmatch('*.podspec.json') }
+          spec_files.reduce({}) do |hash, spec_file|
+            spec = Specification.from_file(spec_file)
+            hash[spec.name] = {} if hash[spec.name].nil?
+            release = spec_file.to_s.start_with? (specs_dir + 'Release').to_s
+            request = Downloader::Request.new(:spec => spec, :released => release)
+            hash[spec.name][spec_file] = request
+            hash
+          end
+        end
+      end
+
+    end
+  end
+end