I’ve been having fun getting familiar with Igniter for code generation and modification. Thanks for building and releasing it @zachdaniel ! Is there a suggested approach for modifying Heex code? I have a scenario where I’d like to modify some of the Heex code that mix phx.new generates into core_c…

Sourceror can parse elixir code. Text within sigils is not elixir code. It could be arbitrary text. Only additional tools we have allow us making sense of the text within sigils like for heex the (eex) engines and the tag parsing it can do as well as the related formatter plugin. That’s all provided…

Yeah, we’d need to have a separate parser that creates an AST for the contents of ~H sigils, and then you’d have to update that, and then you can replace the arguments to the ~H sigil with the new resulting string. I haven’t looked into it myself, but I’m positive something like this exists as Phoen…

Thanks all. That makes sense to me. I looked a little at what Phoenix is doing for non-umbrella apps , and have so far seen that it’s copying template files instead of modifying code. I’ll look further, and check out what’s going on in mischka chelekom.

[image] charlesfsl: Thanks all. That makes sense to me. I looked a little at what Phoenix is doing for non-umbrella apps , and have so far seen that it’s copying template files instead of modifying code. I’ll look further, and check out what’s going on in Mishka Chelekom. Hi! At Mishka Cheleko…

Thanks @shahryarjb . I was just checking out the code in Mishka Chelekom. Looking forward to trying it out with Phoenix 1.8 :slight_smile:

You could potentially take a look at Phoenix.LiveView.Tokenizer, using it to turn the text into a data structure you can manipulate, and then see if there is some way to turn it back into a string? That is the general pattern for all of igniter, i.e source -> AST -> manipulate -> source.

[image] charlesfsl: Looking forward to trying it out with Phoenix 1.8 :slight_smile: Thank you; after releasing the Phoenix 1.8, we will test and update the lib for this version :folded_hands:t2:

Oh of course! I apparently had blinders on and was only thinking about Phoenix generators and not LiveView’s more core functionality of diffing markup changes. Thanks @zachdaniel

Elixir Programming Language Forum

How to Modify Heex with Igniter

Questions & Help Questions

olivermt April 15, 2025, 3:05pm 3

@shahryarjb is doing this in mischka chelekom library I believe