Improve rescue nesting.

Library/Homebrew/diagnostic.rb

@@ -516,10 +516,10 @@ module Homebrew
 
         # Our gettext formula will be caught by check_linked_keg_only_brews
         gettext = begin
-                    Formulary.factory("gettext")
+          Formulary.factory("gettext")
-                  rescue
+        rescue
-                    nil
+          nil
-                  end
+        end
         homebrew_owned = @found.all? do |path|
           Pathname.new(path).realpath.to_s.start_with? "#{HOMEBREW_CELLAR}/gettext"
         end
@@ -537,10 +537,10 @@ module Homebrew
         return if @found.empty?
 
         libiconv = begin
-                     Formulary.factory("libiconv")
+          Formulary.factory("libiconv")
-                   rescue
+        rescue
-                     nil
+          nil
-                   end
+        end
         if libiconv && libiconv.linked_keg.directory?
           unless libiconv.keg_only?
             <<-EOS.undent

Library/Homebrew/download_strategy.rb

@@ -269,10 +269,10 @@ class AbstractFileDownloadStrategy < AbstractDownloadStrategy
     case entries.length
     when 0 then raise "Empty archive"
     when 1 then begin
-                  Dir.chdir entries.first
+        Dir.chdir entries.first
-                rescue
+      rescue
-                  nil
+        nil
-                end
+      end
     end
   end
 

Library/Homebrew/global.rb

@@ -56,10 +56,10 @@ require "compat" unless ARGV.include?("--no-compat") || ENV["HOMEBREW_NO_COMPAT"
 
 ORIGINAL_PATHS = ENV["PATH"].split(File::PATH_SEPARATOR).map do |p|
   begin
-                                                    Pathname.new(p).expand_path
+    Pathname.new(p).expand_path
-                                                  rescue
+  rescue
-                                                    nil
+    nil
-                                                  end
+  end
 end.compact.freeze
 
 # TODO: remove this as soon as it's removed from commands.rb.

Library/Homebrew/software_spec.rb

@@ -339,10 +339,10 @@ class BottleSpecification
     os_versions = collector.keys
     os_versions.map! do |osx|
       begin
-                               MacOS::Version.from_symbol osx
+        MacOS::Version.from_symbol osx
-                             rescue
+      rescue
-                               nil
+        nil
-                             end
+      end
     end.compact!
     os_versions.sort.reverse_each do |os_version|
       osx = os_version.to_sym