anchor.diff:  
       | "add" -> Some Add
       | "drop" -> Some Drop
  -    | "pending" -> Some Pending
       | "list" -> Some List
       | "describe" -> Some Describe
   
  
positive.code:         MainCommand.AddNuGet, "add nuget <nuget-uri> : add nuget uri"
          MainCommand.ListNuget, "list nuget : list NuGet feeds"
          MainCommand.Unknown, ""
          MainCommand.DropView, "pending view <viewId> : create view with modified and depending repos"
          MainCommand.DropView, "drop view <viewId> : drop view"
          MainCommand.ListView, "list view : list views"
          MainCommand.DescribeView, "describe view <name> : describe view"
  
negative.code: 
      | Add
      | Drop
      | List
      | Describe
  
  