uses: Print cask uses

Library/Homebrew/cmd/deps.rb

@@ -110,16 +110,6 @@ module Homebrew
     puts all_deps
   end
 
-  def dependents(formulae_or_casks)
-    formulae_or_casks.map do |formula_or_cask|
-      if formula_or_cask.is_a?(Formula)
-        formula_or_cask
-      else
-        CaskDependent.new(formula_or_cask)
-      end
-    end
-  end
-
   def sorted_dependents(formulae_or_casks)
     dependents(formulae_or_casks).sort_by(&:name)
   end

Library/Homebrew/cmd/uses.rb

@@ -6,6 +6,7 @@
 
 require "formula"
 require "cli/parser"
+require "cask/caskroom"
 
 module Homebrew
   extend DependenciesHelpers
@@ -71,17 +72,33 @@ module Homebrew
     uses = if use_runtime_dependents && !used_formulae_missing
       used_formulae.map(&:runtime_installed_formula_dependents)
                    .reduce(&:&)
-                   .select(&:any_version_installed?)
+                   .select(&:any_version_installed?) +
+        select_used_dependents(dependents(Cask::Caskroom.casks), used_formulae)
     else
-      formulae = args.installed? ? Formula.installed : Formula
+      deps = if args.installed?
+        dependents(Formula.installed + Cask::Caskroom.casks)
+      else
+        dependents(Formula.to_a + Cask::Cask.to_a)
+      end
+
+      select_used_dependents(deps, used_formulae)
+    end
+
+    return if uses.empty?
+
+    puts Formatter.columns(uses.map(&:full_name).sort)
+    odie "Missing formulae should not have dependents!" if used_formulae_missing
+  end
+
+  def select_used_dependents(dependents, used_formulae)
     recursive = args.recursive?
     includes, ignores = argv_includes_ignores(ARGV)
 
-      formulae.select do |f|
+    dependents.select do |d|
       deps = if recursive
-          recursive_includes(Dependency, f, includes, ignores)
+        recursive_includes(Dependency, d, includes, ignores)
       else
-          reject_ignores(f.deps, ignores, includes)
+        reject_ignores(d.deps, ignores, includes)
       end
 
       used_formulae.all? do |ff|
@@ -102,10 +119,4 @@ module Homebrew
       end
     end
   end
-
-    return if uses.empty?
-
-    puts Formatter.columns(uses.map(&:full_name).sort)
-    odie "Missing formulae should not have dependents!" if used_formulae_missing
-  end
 end

Library/Homebrew/dependencies.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "delegate"
+require "cask_dependent"
 
 class Dependencies < DelegateClass(Array)
   def initialize(*args)
@@ -122,4 +123,14 @@ module DependenciesHelpers
       includes.none? { |include| dep.send(include) }
     end
   end
+
+  def dependents(formulae_or_casks)
+    formulae_or_casks.map do |formula_or_cask|
+      if formula_or_cask.is_a?(Formula)
+        formula_or_cask
+      else
+        CaskDependent.new(formula_or_cask)
+      end
+    end
+  end
 end