Added new user helpers

lib/facebooker2/rails/helpers/user.rb

@@ -24,6 +24,25 @@ module Facebooker2
         FB_NAME_VALID_OPTION_KEYS = [:firstnameonly, :linked, :lastnameonly, :possessive, :reflexive, 
                                      :shownetwork, :useyou, :ifcantsee, :capitalize, :subjectid]
         
+        
+        def fb_profile_pic(user, options={})
+          options = options.dup
+          validate_fb_profile_pic_size(options)
+          options = fb_transform_keys(options,FB_PROFILE_PIC_OPTION_KEYS_TO_TRANSFORM)
+          fb_assert_valid_keys(options,FB_PROFILE_PIC_VALID_OPTION_KEYS)
+          options.merge!(:uid => Facebooker2.cast_to_facebook_id(user))
+          content_tag("fb:profile-pic", nil,fb_stringify_vals(options))
+        end
+
+        FB_PROFILE_PIC_OPTION_KEYS_TO_TRANSFORM = {:facebook_logo => 'facebook-logo'}
+        FB_PROFILE_PIC_VALID_OPTION_KEYS = [:size, :linked, 'facebook-logo', :width, :height]
+        VALID_FB_PROFILE_PIC_SIZES = [:thumb, :small, :normal, :square]
+        def validate_fb_profile_pic_size(options)
+          if options.has_key?(:size) && !VALID_FB_PROFILE_PIC_SIZES.include?(options[:size].to_sym)
+            raise(ArgumentError, "Unknown value for size: #{options[:size]}")
+          end
+        end
+
         def fb_stringify_vals(hash)
          result={}
          hash.each do |key,value|

spec/helpers/user_spec.rb

@@ -21,4 +21,32 @@ describe Facebooker2::Rails::Helpers::User, :type=>:helper do
       fb_name(Mogli::User.new(:id=>"123")).should =~ /uid="123"/
     end
   end
+  
+  describe "profile pic" do
+    it "has an fb_profile_pic tag" do
+      fb_profile_pic("loggedinuser").should == "<fb:profile-pic uid=\"loggedinuser\"></fb:profile-pic>"
+    end
+    
+    it "translates keys" do
+      fb_profile_pic(1,:facebook_logo=>true).should == 
+        "<fb:profile-pic facebook-logo=\"true\" uid=\"1\"></fb:profile-pic>"
+    end
+    
+    it "validates the size option" do
+      lambda do
+        fb_profile_pic(1,:size=>:invalid)
+      end.should raise_error(ArgumentError)
+    end
+    
+    it "raises an error on invalid keys" do
+      lambda do
+        fb_profile_pic(1,:invalid=>true)
+      end.should raise_error(ArgumentError)
+    end
+    
+    it "casts the user to a facebook_id" do
+      fb_profile_pic(Mogli::User.new(:id=>1)).should == "<fb:profile-pic uid=\"1\"></fb:profile-pic>"
+      
+    end
+  end
 end