Merge pull request #2822 from ilovezfs/software_spec-recursive-reqs

software_spec: define recursive deps and reqs

Library/Homebrew/software_spec.rb

@@ -161,10 +161,24 @@ class SoftwareSpec
     dependency_collector.deps
   end
 
+  def recursive_dependencies
+    recursive_dependencies = deps
+    deps.map(&:to_formula).compact.uniq.each do |f|
+      f.recursive_dependencies.each do |dep|
+        recursive_dependencies << dep unless recursive_dependencies.include?(dep)
+      end
+    end
+    recursive_dependencies
+  end
+
   def requirements
     dependency_collector.requirements
   end
 
+  def recursive_requirements
+    Requirement.expand(self)
+  end
+
   def patch(strip = :p1, src = nil, &block)
     p = Patch.create(strip, src, &block)
     dependency_collector.add(p.resource) if p.is_a? ExternalPatch