Add brew deps --skip-installed arg

Library/Homebrew/cmd/deps.rb

@@ -49,6 +49,8 @@ module Homebrew
       switch "--installed",
              description: "List dependencies for formulae that are currently installed. If <formula> is " \
                           "specified, list only its dependencies that are currently installed."
+      switch "--skip-installed",
+             description: "Skip dependencies for formulae that are currently installed."
       switch "--eval-all",
              description: "Evaluate all available formulae and casks, whether installed or not, to list " \
                           "their dependencies."
@@ -64,6 +66,7 @@ module Homebrew
              description: "Treat all named arguments as casks."
 
       conflicts "--tree", "--graph"
+      conflicts "--installed", "--skip-installed"
       conflicts "--installed", "--eval-all"
       conflicts "--installed", "--all"
       conflicts "--formula", "--cask"

Library/Homebrew/dependencies_helpers.rb

@@ -30,6 +30,7 @@ module DependenciesHelpers
     end
 
     ignores << "recommended?" if args.skip_recommended?
+    ignores << "satisfied?" if args.skip_installed?
 
     [includes, ignores]
   end
@@ -44,6 +45,8 @@ module DependenciesHelpers
         klass.prune if ignores.include?("recommended?") || dependent.build.without?(dep)
       elsif dep.optional?
         klass.prune if includes.exclude?("optional?") && !dependent.build.with?(dep)
+      elsif dep.satisfied?
+        klass.prune if ignores.include?("satisfied?")
       elsif dep.build? || dep.test?
         keep = false
         keep ||= dep.test? && includes.include?("test?") && dependent == root_dependent

Library/Homebrew/dependency.rb

@@ -48,7 +48,7 @@ class Dependency
     to_formula.latest_version_installed?
   end
 
-  def satisfied?(inherited_options)
+  def satisfied?(inherited_options = [])
     installed? && missing_options(inherited_options).empty?
   end