Move bottle filename construction to a class

Library/Homebrew/bottles.rb

@@ -3,14 +3,6 @@ require 'os/mac'
 require 'extend/ARGV'
 require 'bottle_version'
 
-def bottle_filename options={}
-  name     = options.fetch(:name)
-  version  = options.fetch(:version)
-  tag      = options.fetch(:tag)
-  revision = options.fetch(:revision)
-  "#{name}-#{version}.#{tag}#{bottle_suffix(revision)}"
-end
-
 def built_as_bottle? f
   return false unless f.installed?
   tab = Tab.for_keg(f.installed_prefix)
@@ -36,8 +28,9 @@ def bottle_native_regex
   /(\.#{bottle_tag}\.bottle\.(\d+\.)?tar\.gz)$/o
 end
 
-def bottle_url(root_url, filename_options)
-  "#{root_url}/#{bottle_filename(filename_options)}"
+def bottle_url(root_url, *filename_args)
+  filename = Bottle::Filename.new(*filename_args)
+  "#{root_url}/#{filename}"
 end
 
 def bottle_tag

Library/Homebrew/cmd/bottle.rb

@@ -125,12 +125,7 @@ module Homebrew
       bottle_revision = max ? max + 1 : 0
     end
 
-    filename = bottle_filename(
-      :name => f.name,
-      :version => f.pkg_version,
-      :revision => bottle_revision,
-      :tag => bottle_tag
-    )
+    filename = Bottle::Filename.new(f.name, f.pkg_version, bottle_tag, bottle_revision)
 
     if bottle_filename_formula_name(filename).empty?
       return ofail "Add a new regex to bottle_version.rb to parse #{f.version} from #{filename}"
@@ -197,7 +192,7 @@ module Homebrew
     puts output
 
     if ARGV.include? '--rb'
-      bottle_base = filename.gsub(bottle_suffix(bottle_revision), '')
+      bottle_base = filename.to_s.gsub(bottle_suffix(bottle_revision), '')
       File.open "#{bottle_base}.bottle.rb", 'w' do |file|
         file.write output
       end

Library/Homebrew/software_spec.rb

@@ -113,6 +113,22 @@ class HeadSoftwareSpec < SoftwareSpec
 end
 
 class Bottle
+  class Filename
+    attr_reader :name, :version, :tag, :revision
+
+    def initialize(name, version, tag, revision)
+      @name = name
+      @version = version
+      @tag = tag
+      @revision = revision
+    end
+
+    def to_s
+      "#{name}-#{version}.#{tag}#{bottle_suffix(revision)}"
+    end
+    alias_method :to_str, :to_s
+  end
+
   extend Forwardable
 
   attr_reader :name, :resource, :prefix, :cellar, :revision
@@ -127,13 +143,7 @@ class Bottle
 
     checksum, tag = spec.checksum_for(bottle_tag)
 
-    @resource.url = bottle_url(
-      spec.root_url,
-      :name => formula.name,
-      :version => formula.pkg_version,
-      :revision => spec.revision,
-      :tag => tag
-    )
+    @resource.url = bottle_url(spec.root_url, formula.name, formula.pkg_version, tag, spec.revision)
     @resource.download_strategy = CurlBottleDownloadStrategy
     @resource.version = formula.pkg_version
     @resource.checksum = checksum

Library/Homebrew/test/test_bottle_filename.rb

@@ -0,0 +1,14 @@
+require "testing_env"
+require "software_spec"
+
+class BottleFilenameTests < Homebrew::TestCase
+  def fn(revision)
+    Bottle::Filename.new("foo", "1.0", :tag, revision)
+  end
+
+  def test_to_str
+    expected = "foo-1.0.tag.bottle.tar.gz"
+    assert_equal expected, fn(0).to_s
+    assert_equal expected, fn(0).to_str
+  end
+end