also add file name to inline send_file

lib/sinatra/base.rb

@@ -252,8 +252,8 @@ def content_type(type = nil, params={})
 
     # Set the Content-Disposition to "attachment" with the specified filename,
     # instructing the user agents to prompt to save.
-    def attachment(filename=nil)
-      response['Content-Disposition'] = 'attachment'
+    def attachment(filename = nil, disposition = 'attachment')
+      response['Content-Disposition'] = disposition.to_s
       if filename
         params = '; filename="%s"' % File.basename(filename)
         response['Content-Disposition'] << params
@@ -268,11 +268,11 @@ def send_file(path, opts={})
         content_type opts[:type] || File.extname(path), :default => 'application/octet-stream'
       end
 
-      if opts[:disposition] == 'attachment' || opts[:filename]
-        attachment opts[:filename] || path
-      elsif opts[:disposition] == 'inline'
-        response['Content-Disposition'] = 'inline'
-      end
+      disposition = opts[:disposition]
+      filename    = opts[:filename]
+      disposition = 'attachment' if disposition.nil? and filename
+      filename    = path         if filename.nil?
+      attachment(filename, disposition) if disposition
 
       last_modified opts[:last_modified] if opts[:last_modified]
 

test/helpers_test.rb

@@ -701,10 +701,16 @@ def send_file_app(opts={})
       assert_equal 'attachment; filename="file.txt"', response['Content-Disposition']
     end
 
+    it "does not set add a file name if filename is false" do
+      send_file_app :disposition => 'inline', :filename => false
+      get '/file.txt'
+      assert_equal 'inline', response['Content-Disposition']
+    end
+
     it "sets the Content-Disposition header when :disposition set to 'inline'" do
       send_file_app :disposition => 'inline'
       get '/file.txt'
-      assert_equal 'inline', response['Content-Disposition']
+      assert_equal 'inline; filename="file.txt"', response['Content-Disposition']
     end
 
     it "sets the Content-Disposition header when :filename provided" do