Fix frozen string errors

lib/awesome_print/ext/active_record.rb

@@ -55,7 +55,7 @@ module AwesomePrint
                  hash
                end
              end
-      "#{object} " << awesome_hash(data)
+      "#{object} #{awesome_hash(data)}"
     end
 
     # Format ActiveRecord class object.
@@ -95,7 +95,7 @@ module AwesomePrint
              end
 
       data.merge!({details: object.details, messages: object.messages})
-      "#{object} " << awesome_hash(data)
+      "#{object} #{awesome_hash(data)}"
     end
   end
 end

lib/awesome_print/formatters/array_formatter.rb

@@ -31,7 +31,7 @@ module AwesomePrint
         if options[:multiline]
           multiline_array
         else
-          '[ ' << array.map { |item| inspector.awesome(item) }.join(', ') << ' ]'
+          "[ #{array.map { |item| inspector.awesome(item) }.join(', ')} ]"
         end
       end
 

lib/awesome_print/formatters/hash_formatter.rb

@@ -73,7 +73,7 @@ module AwesomePrint
 
         keys.map! do |key|
           plain_single_line do
-            [inspector.awesome(key), hash[key]]
+            [String.new(inspector.awesome(key)), hash[key]]
           end
         end
       end

lib/awesome_print/formatters/object_formatter.rb

@@ -22,7 +22,7 @@ module AwesomePrint
             object.respond_to?(property) ? :reader : nil
           end
           if accessor
-            ["attr_#{accessor} :#{property}", var]
+            [String.new("attr_#{accessor} :#{property}"), var]
           else
             [var.to_s, var]
           end
@@ -60,7 +60,8 @@ module AwesomePrint
       end
 
       def awesome_instance
-        str = object.send(options[:class_name]).to_s
+        str = String.new
+        str << object.send(options[:class_name]).to_s
         str << ":0x%08x" % (object.__id__ * 2) if options[:object_id]
         str
       end

spec/formats_spec.rb

@@ -492,7 +492,7 @@ EOS
   describe 'File' do
     it 'should display a file (plain)' do
       File.open(__FILE__, 'r') do |f|
-        expect(f.ai(plain: true)).to eq("#{f.inspect}\n" << `ls -alF #{f.path}`.chop)
+        expect(f.ai(plain: true)).to eq("#{f.inspect}\n#{`ls -alF #{f.path}`.chop}")
       end
     end
   end
@@ -501,7 +501,7 @@ EOS
   describe 'Dir' do
     it 'should display a direcory (plain)' do
       Dir.open(File.dirname(__FILE__)) do |d|
-        expect(d.ai(plain: true)).to eq("#{d.inspect}\n" << `ls -alF #{d.path}`.chop)
+        expect(d.ai(plain: true)).to eq("#{d.inspect}\n#{`ls -alF #{d.path}`.chop}")
       end
     end
   end
@@ -694,7 +694,7 @@ EOS
       class My < File; end
 
       my = File.new('/dev/null') rescue File.new('nul')
-      expect(my.ai(plain: true)).to eq("#{my.inspect}\n" << `ls -alF #{my.path}`.chop)
+      expect(my.ai(plain: true)).to eq("#{my.inspect}\n#{`ls -alF #{my.path}`.chop}")
     end
 
     it 'inherited from Dir should be displayed as Dir' do
@@ -702,7 +702,7 @@ EOS
 
       require 'tmpdir'
       my = My.new(Dir.tmpdir)
-      expect(my.ai(plain: true)).to eq("#{my.inspect}\n" << `ls -alF #{my.path}`.chop)
+      expect(my.ai(plain: true)).to eq("#{my.inspect}\n#{`ls -alF #{my.path}`.chop}")
     end
 
     it 'should handle a class that defines its own #send method' do