Add mix task (or Ash Injector?) to replace ~CURL with %Req.Request{}

[derekkraan]

It would be nice to have a mix task or injector that you can call that replaces all instances of the ~CURL sigil in your code with the corresponding %Req.Request{}. That would enable workflows like: coding with ~CURL and when you're done, run the mix task to convert it all to %Req.Request{}, which is, I think, what most (or at least many) people want in their app at the end of the day.

[kevinschweikert]

That sounds like an awesome idea!
What would we need to do?

• Find the AST where the sigil_CURL/1 is used
• use Macro.expand_once/2
• put the AST back or convert to string with Macro.to_string/1

Maybe the mix task igniter.refactor.rename_function from https://github.com/ash-project/igniter/blob/main/lib/igniter/refactors/rename.ex could be an inspiration

[derekkraan]

Sourceror is the other lib that can help us here (it's what igniter uses under the hood)

[kevinschweikert]

True! I did a quick test and it could work! Heres my Livebook Test

Curl Sigil Expansion

Mix.install([
  {:sourceror, "~> 1.7"},
  {:curl_req, "~> 0.98.6"},
])

Sourceror

import CurlReq
"""
~CURL(https://example.com)
"""
|> Sourceror.parse_string!()
|> Macro.postwalk(fn 
  {:sigil_CURL, _dot_meta, _rest} = quoted -> 
    Macro.expand_once(quoted, __ENV__)
  quoted ->
    quoted
end)
|> Sourceror.to_string()
|> Code.eval_string()
|> elem(0)

%Req.Request{
  method: :get,
  url: URI.parse("https://example.com"),
  headers: %{},
  body: nil,
  options: %{},
  halted: false,
  adapter: &Req.Steps.run_finch/1,
  request_steps: [],
  response_steps: [],
  error_steps: [],
  private: %{}
}

[derekkraan]

It looks like you're already 90% of the way there!