Questions & Help>Questions

Unquote with parameter in block

#quote
augnustin

augnustin

So I have this macro:

  defmacro content(_opts \\ [], do: block) do
    quote location: :keep do
      def page_view(var!(conn)) do
        import Kernel, except: [div: 2, to_string: 1]
        import ExAdmin.ViewHelpers
        use Xain
        _ = var!(conn)

        markup safe: true do
          unquote(block)
        end
      end
    end
  end

Which is used like that:

    content do
       # Whatever code
    end

How can I pass the conn variable to the content block?

    content do
      IO.inspect(conn)
    end

Can’t make it work. :frowning:

Thanks

11 comments
#quote
2823 11

Marked As Solved

LostKobrakai

LostKobrakai 

defmodule TestXain do
  defmacro content(do: block) do
    block =
      quote do
        _ = var!(conn)
        import Kernel, except: [div: 2, to_string: 1]
        use Xain

        markup safe: true do
          unquote(block)
        end
      end

    quote location: :keep do
      def page_view(var!(conn)), do: unquote(block)
    end
  end
end


defmodule TestXain.View do
  import TestXain

  content do
    IO.inspect(conn)
  end
end

iex(1)> TestXain.View.page_view(1)
1
{:safe, "1"}

This seems to work fine for me and circumvents the whole problem of unquote fragments.

3
Post #2

Also Liked

LostKobrakai

LostKobrakai

You could build the macro to be called like that:

content(conn) do
  IO.inspect(conn)
end

or

content conn do
 IO.inspect(conn)
end

I’d not jump to unhygienic variables without a good reason.

2
Post #6
OvermindDL1

OvermindDL1

I personally prefer something like:

content do
  conn -> IO.inspect(conn)
end

You can either decompose it to grab the head as the var, or just use it as a case context with full matching and all, which is also so easy to do in quotes. :slight_smile:

2
Post #7

Last Post!

silviurosu

silviurosu

That worked, Thanks. I never thought it will be that simple with a case statement.

1
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