missing: ignore unused optional and recommended deps

Library/Homebrew/cmd/doctor.rb

@@ -872,7 +872,7 @@ end
 def check_missing_deps
   return unless HOMEBREW_CELLAR.exist?
   s = Set.new
-  Homebrew.missing_deps(Homebrew.installed_brews).each do |_, deps|
+  Homebrew.missing_deps(Formula.installed).each do |_, deps|
     s.merge deps
   end
 

Library/Homebrew/cmd/missing.rb

@@ -1,21 +1,21 @@
 require 'formula'
+require 'tab'
 
 module Homebrew extend self
-  def installed_brews
-    formulae = []
-    HOMEBREW_CELLAR.subdirs.each do |rack|
-      f = Formula.factory rack.basename.to_s rescue nil
-      formulae << f if f and f.rack.exist? and f.rack.subdirs.length > 0
-    end
-    formulae
-  end
-
   def missing_deps ff
     missing = {}
     ff.each do |f|
-      missing_deps = f.recursive_deps.uniq.reject do |dep|
-          dep.rack.exist? and dep.rack.subdirs.length > 0
+      missing_deps = f.recursive_dependencies do |dependent, dep|
+        if dep.optional? || dep.recommended?
+          tab = Tab.for_formula(dependent)
+          Dependency.prune unless tab.with?(dep.name)
+        elsif dep.build?
+          Dependency.prune
         end
+      end
+
+      missing_deps.map!(&:to_formula)
+      missing_deps.reject! { |d| d.rack.exist? && d.rack.subdirs.length > 0 }
 
       unless missing_deps.empty?
         yield f.name, missing_deps if block_given?
@@ -29,7 +29,7 @@ module Homebrew extend self
     return unless HOMEBREW_CELLAR.exist?
 
     ff = if ARGV.named.empty?
-      installed_brews
+      Formula.installed
     else
       ARGV.formulae
     end