1 files changed, 68 insertions, 66 deletions
diff --git a/Library/Homebrew/compat/dependency_collector.rb b/Library/Homebrew/compat/dependency_collector.rb
index 1c91f2283..84d5431f3 100644
--- a/Library/Homebrew/compat/dependency_collector.rb
+++ b/Library/Homebrew/compat/dependency_collector.rb
@@ -1,80 +1,82 @@
 require "dependency_collector"
 
 class DependencyCollector
-  alias _parse_string_spec parse_string_spec
+  module Compat
+    # Define the languages that we can handle as external dependencies.
+    LANGUAGE_MODULES = Set[
+      :lua, :lua51, :perl, :python, :python3, :ruby
+    ].freeze
 
-  # Define the languages that we can handle as external dependencies.
-  LANGUAGE_MODULES = Set[
-    :lua, :lua51, :perl, :python, :python3, :ruby
-  ].freeze
+    def parse_string_spec(spec, tags)
+      if (tag = tags.first) && LANGUAGE_MODULES.include?(tag)
+        odeprecated "'depends_on ... => #{tag.inspect}'"
+        LanguageModuleRequirement.new(tag, spec, tags[1])
+      else
+        super
+      end
+    end
 
-  def parse_string_spec(spec, tags)
-    if (tag = tags.first) && LANGUAGE_MODULES.include?(tag)
-      odeprecated "'depends_on :#{tag}'"
-      LanguageModuleRequirement.new(tag, spec, tags[1])
-    else
-      _parse_string_spec(spec, tags)
+    def parse_symbol_spec(spec, tags)
+      case spec
+      when :clt
+        odeprecated "'depends_on :clt'"
+      when :tex
+        odeprecated "'depends_on :tex'"
+        TeXRequirement.new(tags)
+      when :autoconf, :automake, :bsdmake, :libtool
+        output_deprecation(spec)
+        autotools_dep(spec, tags)
+      when :cairo, :fontconfig, :freetype, :libpng, :pixman
+        output_deprecation(spec)
+        Dependency.new(spec.to_s, tags)
+      when :ant, :expat
+        output_deprecation(spec)
+        Dependency.new(spec.to_s, tags)
+      when :libltdl
+        tags << :run
+        output_deprecation("libtool")
+        Dependency.new("libtool", tags)
+      when :apr
+        output_deprecation(spec, "apr-util")
+        Dependency.new("apr-util", tags)
+      when :fortran
+        output_deprecation(spec, "gcc")
+        Dependency.new("gcc", tags)
+      when :gpg
+        output_deprecation(spec, "gnupg")
+        Dependency.new("gnupg", tags)
+      when :hg
+        output_deprecation(spec, "mercurial")
+        Dependency.new("mercurial", tags)
+      when :mpi
+        output_deprecation(spec, "open-mpi")
+        Dependency.new("open-mpi", tags)
+      when :python, :python2
+        output_deprecation(spec, "python")
+        Dependency.new("python", tags)
+      when :python3
+        output_deprecation(spec, "python3")
+        Dependency.new("python3", tags)
+      when :emacs, :mysql, :perl, :postgresql, :rbenv, :ruby
+        output_deprecation(spec)
+        Dependency.new(spec, tags)
+      else
+        super
+      end
     end
-  end
 
-  alias _parse_symbol_spec parse_symbol_spec
+    private
 
-  def parse_symbol_spec(spec, tags)
-    case spec
-    when :clt
-      odeprecated "'depends_on :clt'"
-    when :tex
-      odeprecated "'depends_on :tex'"
-      TeXRequirement.new(tags)
-    when :autoconf, :automake, :bsdmake, :libtool
-      output_deprecation(spec)
-      autotools_dep(spec, tags)
-    when :cairo, :fontconfig, :freetype, :libpng, :pixman
-      output_deprecation(spec)
-      Dependency.new(spec.to_s, tags)
-    when :ant, :expat
-      output_deprecation(spec)
+    def autotools_dep(spec, tags)
+      tags << :build unless tags.include? :run
       Dependency.new(spec.to_s, tags)
-    when :libltdl
-      tags << :run
-      output_deprecation("libtool")
-      Dependency.new("libtool", tags)
-    when :apr
-      output_deprecation(spec, "apr-util")
-      Dependency.new("apr-util", tags)
-    when :fortran
-      output_deprecation(spec, "gcc")
-      Dependency.new("gcc", tags)
-    when :gpg
-      output_deprecation(spec, "gnupg")
-      Dependency.new("gnupg", tags)
-    when :hg
-      output_deprecation(spec, "mercurial")
-      Dependency.new("mercurial", tags)
-    when :mpi
-      output_deprecation(spec, "open-mpi")
-      Dependency.new("open-mpi", tags)
-    when :python, :python2
-      output_deprecation(spec, "python")
-      Dependency.new("python", tags)
-    when :python3
-      output_deprecation(spec, "python3")
-      Dependency.new("python3", tags)
-    when :emacs, :mysql, :perl, :postgresql, :rbenv, :ruby
-      output_deprecation(spec)
-      Dependency.new(spec, tags)
-    else
-      _parse_symbol_spec(spec, tags)
     end
-  end
 
-  def autotools_dep(spec, tags)
-    tags << :build unless tags.include? :run
-    Dependency.new(spec.to_s, tags)
+    def output_deprecation(dependency, new_dependency = dependency)
+      odeprecated "'depends_on :#{dependency}'",
+                  "'depends_on \"#{new_dependency}\"'"
+    end
   end
 
-  def output_deprecation(dependency, new_dependency = dependency)
-    odeprecated "'depends_on :#{dependency}'",
-                "'depends_on \"#{new_dependency}\"'"
-  end
+  prepend Compat
 end