Merge pull request #3304 from richiethomas/refactor_uses

In 'readall.rb', replaced multi-step 'each' loop with one-line method chain of Ruby enumerator methods

Library/Homebrew/cmd/list.rb

@@ -39,7 +39,7 @@ module Homebrew
       filtered_list
     elsif ARGV.named.empty?
       if ARGV.include? "--full-name"
-        full_names = Formula.installed.map(&:full_name).sort &tap_and_name_comparison
+        full_names = Formula.installed.map(&:full_name).sort(&tap_and_name_comparison)
         return if full_names.empty?
         puts Formatter.columns(full_names)
       else

Library/Homebrew/cmd/readall.rb

@@ -14,16 +14,8 @@ module Homebrew
 
   def readall
     if ARGV.include?("--syntax")
-      ruby_files = []
-      scan_files = %W[
-        #{HOMEBREW_LIBRARY}/*.rb
-        #{HOMEBREW_LIBRARY}/Homebrew/**/*.rb
-      ]
-      Dir.glob(scan_files).each do |rb|
-        next if rb.include?("/vendor/")
-        next if rb.include?("/cask/")
-        ruby_files << rb
-      end
+      scan_files = "#{HOMEBREW_LIBRARY_PATH}/**/*.rb"
+      ruby_files = Dir.glob(scan_files).reject { |file| file =~ %r{/(vendor|cask)/} }
 
       Homebrew.failed = true unless Readall.valid_ruby_syntax?(ruby_files)
     end