The Sinatra docs say:

NOTE: Inline templates defined in the source file that requires sinatra are automatically loaded. Call enable :inline_templates explicitly if you have inline templates in other source files.

This is a puzzler: where do the inline templates defined in the source file that requires sinatra get loaded?

Here's the code that runs when you enable :inline_templates . Curious to see that you could also do something like set :inline_templates, 'another_file.rb' .

https://github.com/codereading/sinatra/blob/ver1.3.2/lib/sinatra/base.rb#L1049

      # Load embeded templates from the file; uses the caller's __FILE__
      # when no file is specified.
      def inline_templates=(file=nil)
        file = (file.nil? || file == true) ? (caller_files.first || File.expand_path($0)) : file

        begin
          io = ::IO.respond_to?(:binread) ? ::IO.binread(file) : ::IO.read(file)
          app, data = io.gsub("\r\n", "\n").split(/^__END__$/, 2)
        rescue Errno::ENOENT
          app, data = nil
        end

        if data
          if app and app =~ /([^\n]*\n)?#[^\n]*coding: *(\S+)/m
            encoding = $2
          else
            encoding = settings.default_encoding
          end
          lines = app.count("\n") + 1
          template = nil
          force_encoding data, encoding
          data.each_line do |line|
            lines += 1
            if line =~ /^@@\s*(.*\S)\s*$/
              template = force_encoding('', encoding)
              templates[$1.to_sym] = [template, file, lines]
            elsif template
              template << line
            end
          end
        end
      end

How do "inline templates" work internally? #7

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