Avoid expensive Pathname concatenation

Library/Homebrew/download_strategy.rb

@@ -37,13 +37,13 @@ class CurlDownloadStrategy < AbstractDownloadStrategy
     super
 
     if name.to_s.empty? || name == '__UNKNOWN__'
-      @tarball_path = HOMEBREW_CACHE + File.basename(@url)
+      @tarball_path = Pathname.new("#{HOMEBREW_CACHE}/#{File.basename(@url)}")
     else
-      @tarball_path = HOMEBREW_CACHE + "#{name}-#{package.version}#{ext}"
+      @tarball_path = Pathname.new("#{HOMEBREW_CACHE}/#{name}-#{package.version}#{ext}")
     end
 
     @mirrors = package.mirrors
-    @temporary_path = Pathname("#@tarball_path.incomplete")
+    @temporary_path = Pathname.new("#@tarball_path.incomplete")
     @local_bottle_path = nil
   end
 
@@ -213,7 +213,7 @@ class SubversionDownloadStrategy < AbstractDownloadStrategy
     if name.to_s.empty? || name == '__UNKNOWN__'
       raise NotImplementedError, "strategy requires a name parameter"
     else
-      @co = HOMEBREW_CACHE + "#{name}--svn"
+      @co = Pathname.new("#{HOMEBREW_CACHE}/#{name}--svn")
     end
 
     @co += "-HEAD" if ARGV.build_head?
@@ -316,7 +316,7 @@ class GitDownloadStrategy < AbstractDownloadStrategy
     if name.to_s.empty? || name == '__UNKNOWN__'
       raise NotImplementedError, "strategy requires a name parameter"
     else
-      @clone = HOMEBREW_CACHE + "#{name}--git"
+      @clone = Pathname.new("#{HOMEBREW_CACHE}/#{name}--git")
     end
   end
 

Library/Homebrew/formula.rb

@@ -116,16 +116,16 @@ class Formula
   end
 
   def linked_keg
-    HOMEBREW_REPOSITORY/'Library/LinkedKegs'/name
+    Pathname.new("#{HOMEBREW_LIBRARY}/LinkedKegs/#{name}")
   end
 
   def installed_prefix
     devel_prefix = unless devel.nil?
-      HOMEBREW_CELLAR/name/devel.version
+      Pathname.new("#{HOMEBREW_CELLAR}/#{name}/#{devel.version}")
     end
 
     head_prefix = unless head.nil?
-      HOMEBREW_CELLAR/name/head.version
+      Pathname.new("#{HOMEBREW_CELLAR}/#{name}/#{head.version}")
     end
 
     if active_spec == head || head and head_prefix.directory?
@@ -143,7 +143,7 @@ class Formula
   end
 
   def prefix
-    HOMEBREW_CELLAR+name+version
+    Pathname.new("#{HOMEBREW_CELLAR}/#{name}/#{version}")
   end
   def rack; prefix.parent end
 
@@ -185,7 +185,9 @@ class Formula
   # Defined and active build-time options.
   def build; self.class.build; end
 
-  def opt_prefix; HOMEBREW_PREFIX/:opt/name end
+  def opt_prefix
+    Pathname.new("#{HOMEBREW_PREFIX}/opt/#{name}")
+  end
 
   def download_strategy
     active_spec.download_strategy
@@ -350,13 +352,14 @@ class Formula
   def self.canonical_name name
     name = name.to_s if name.kind_of? Pathname
 
-    formula_with_that_name = HOMEBREW_REPOSITORY+"Library/Formula/#{name}.rb"
-    possible_alias = HOMEBREW_REPOSITORY+"Library/Aliases/#{name}"
-    possible_cached_formula = HOMEBREW_CACHE_FORMULA+"#{name}.rb"
+    formula_with_that_name = Pathname.new("#{HOMEBREW_REPOSITORY}/Library/Formula/#{name}.rb")
+    possible_alias = Pathname.new("#{HOMEBREW_REPOSITORY}/Library/Aliases/#{name}")
+    possible_cached_formula = Pathname.new("#{HOMEBREW_CACHE_FORMULA}/#{name}.rb")
 
     if name.include? "/"
       if name =~ %r{(.+)/(.+)/(.+)}
-        tapd = HOMEBREW_REPOSITORY/"Library/Taps"/"#$1-#$2".downcase
+        tap_name = "#$1-#$2".downcase
+        tapd = Pathname.new("#{HOMEBREW_REPOSITORY}/Library/Taps/#{tap_name}")
         tapd.find_formula do |relative_pathname|
           return "#{tapd}/#{relative_pathname}" if relative_pathname.stem.to_s == $3
         end if tapd.directory?
@@ -472,7 +475,7 @@ class Formula
   end
 
   def self.path name
-    HOMEBREW_REPOSITORY+"Library/Formula/#{name.downcase}.rb"
+    Pathname.new("#{HOMEBREW_REPOSITORY}/Library/Formula/#{name.downcase}.rb")
   end
 
   def deps;         self.class.dependencies.deps;         end

Library/Homebrew/os/mac/xcode.rb

@@ -33,15 +33,15 @@ module MacOS::Xcode extend self
   def prefix
     @prefix ||= begin
       path = Pathname.new(folder)
-      if path.absolute? and (path/'usr/bin/make').executable?
+      if path.absolute? and File.executable? "#{path}/usr/bin/make"
         path
       elsif File.executable? '/Developer/usr/bin/make'
         # we do this to support cowboys who insist on installing
         # only a subset of Xcode
-        Pathname.new '/Developer'
-      elsif (V4_BUNDLE_PATH/'Contents/Developer/usr/bin/make').executable?
+        Pathname.new('/Developer')
+      elsif File.executable? "#{V4_BUNDLE_PATH}/Contents/Developer/usr/bin/make"
         # fallback for broken Xcode 4.3 installs
-        V4_BUNDLE_PATH/'Contents/Developer'
+        Pathname.new("#{V4_BUNDLE_PATH}/Contents/Developer")
       else
         # Ask Spotlight where Xcode is. If the user didn't install the
         # helper tools and installed Xcode in a non-conventional place, this
@@ -51,7 +51,7 @@ module MacOS::Xcode extend self
 
         unless path.nil?
           path += "Contents/Developer"
-          path if (path/'usr/bin/make').executable?
+          path if File.executable? "#{path}/usr/bin/make"
         end
       end
     end
@@ -76,7 +76,7 @@ module MacOS::Xcode extend self
 
     # this shortcut makes version work for people who don't realise you
     # need to install the CLI tools
-    xcode43build = prefix/'usr/bin/xcodebuild'
+    xcode43build = Pathname.new("#{prefix}/usr/bin/xcodebuild")
     if xcode43build.file?
       `#{xcode43build} -version 2>/dev/null` =~ /Xcode (\d(\.\d)*)/
       return $1 if $1

Library/Homebrew/os/mac/xquartz.rb

@@ -70,27 +70,27 @@ module MacOS::X11 extend self
   # Confusingly, executables (e.g. config scripts) are only found under
   # /opt/X11/bin or /usr/X11/bin in all cases.
   def bin
-    prefix/'bin'
+    Pathname.new("#{prefix}/bin")
   end
 
   def include
     @include ||= if use_sdk?
-      MacOS.sdk_path/'usr/X11/include'
+      Pathname.new("#{MacOS.sdk_path}/usr/X11/include")
     else
-      prefix/'include'
+      Pathname.new("#{prefix}/include")
     end
   end
 
   def lib
     @lib ||= if use_sdk?
-      MacOS.sdk_path/'usr/X11/lib'
+      Pathname.new("#{MacOS.sdk_path}/usr/X11/lib")
     else
-      prefix/'lib'
+      Pathname.new("#{prefix}/lib")
     end
   end
 
   def share
-    prefix/'share'
+    Pathname.new("#{prefix}/share")
   end
 
   private