Add licenses command to pod cli

lib/cocoapods/command.rb

@@ -11,6 +11,7 @@ module Pod
     require 'cocoapods/command/help'
     require 'cocoapods/command/inter_process_communication'
     require 'cocoapods/command/lib'
+    require 'cocoapods/command/licenses'
     require 'cocoapods/command/list'
     require 'cocoapods/command/outdated'
     require 'cocoapods/command/podfile_info'

lib/cocoapods/command/licenses.rb

+module Pod
+  class Command
+    class Licenses < Command
+      self.summary = 'Show licenses of installed pods'
+
+      self.description = <<-DESC
+        Shows the licenses of installed pods
+      DESC
+
+      def initialize(argv)
+        super
+      end
+
+      def run
+        verify_podfile_exists!
+        verify_lockfile_exists!
+
+        lockfile = config.lockfile
+        pods = lockfile.pod_names
+        licenses = []
+        deps = lockfile.dependencies.map{|d| d.name}
+        pods = (deps + pods).uniq
+        pods.each do |pod_name|
+          spec = (Pod::SourcesManager.search_by_name(pod_name).first rescue nil)
+          license = "Unknown"
+          if spec
+            specification = spec.specification
+            license = specification.license[:type] || "Unknown"
+          end
+          licenses << [pod_name, license]
+        end
+
+        if licenses.empty?
+          UI.puts "No pods found.".yellow
+        else
+          UI.section "Licenses:" do
+            licenses.each do |(name, license)|
+              UI.puts "#{name}: #{license}"
+            end
+          end
+        end
+      end
+    end
+  end
+end
+
+