An alternative approach (for the Elixir LS team) would be to recognize
body-less clauses as the start of a folding range across all clauses of a
function, ex:
v defmodule MyServer do
@doc "handle events"
v def handle_event(event, state)
v def handle_event({:login, session}, state) do
#...
end
> def handle_event({:logout, session}, state) do ...
end
Toggling the second fold would lead to:
v defmodule MyServer do
@doc "handle events"
> def handle_event(event, state) ...
end
Bodyless clauses are already required syntactically to be before all
concrete implementations (used to anchor cross-clause concerns like
default-args, @doc, and @spec), multi-clause functions are already required
syntactically to be clustered, and future type system syntax will likely
work with the same conceits.
I like to provide one for most multi-clause function implementations for
easy-of-scannability purposes and foldability seems like a related concern.
All you'd have to do to organize your code to be foldable is to provide a
bodyless clause, which you are likely to do if you care about readability
for the arg/doc/spec benefits anyways.
On Monday, March 17, 2025 at 6:54:50 PM UTC-5 halos...@gmail.com wrote:
> This definitely isn't a language feature, but an editor feature. The
> `#pragma mark` is used for Xcode, but Visual Studio uses `#pragma region`
> and `#pragma endregion` (VS Code may as well) for C/C++ (because of -Wall
> -Werror, unknown pragmas may be warned and/or errored). C# apparently uses
> `//#region` and `//#endregion`, but this isn't recognized in VS Code for
> C/C++.
>
> Not all clients will support it, but the LSP defines a `Folding Range
> Request` (
> https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_foldingRange)
>
> that could be defined matching either `@doc group: NAME` or `# mark: NAME`
> or something, so IMO this would be something to propose to the Elixir LS
> team, because it would provide nice features across all supporting editors.
>
> I don't think that `@doc group: NAME` is the correct choice, because doc
> sections are folded together for functions of the same name.
>
> -a
>
> On Mon, Mar 17, 2025 at 7:24 PM Jean Klingler <sabi...@gmail.com> wrote:
>
>> The ExDoc part of the story is already covered by @doc group I think:
>>
>> https://hexdocs.pm/ex_doc/Mix.Tasks.Docs.html#module-grouping-functions-types-and-callbacks
>>
>> Given @doc group matches the idea of indicating the logical grouping of
>> functions, introducing something else for a similar purpose at the language
>> level might be redundant?
>> I'm not sure if IDEs could leverage them somehow to achieve what you have
>> in mind.
>>
>> Cheers,
>> Jean
>>
>> Le mar. 18 mars 2025 à 05:38, 'Mark Madsen' via elixir-lang-core <
>> elixir-l...@googlegroups.com> a écrit :
>>
>>> Has there been any discussion around adding a module attribute @mark to
>>> Elixir that would function as a code organization tool similar to Swift's
>>> //
>>> MARK: or Objective-C's #pragma mark?
>>>
>>> -- WHY --
>>> As an example I've found that when developing Phoenix LiveView
>>> applications, modules often accumulate numerous handle_event/3 and
>>> handle_info/2 callback functions and it would be nice to have a way to
>>> organize things.
>>>
>>> I understand that right now we can add comments, and we have compiler
>>> warnings. But nothing official an editor can support. Given that we want
>>> all the handle_event and handle_info functions together this seems like the
>>> way.
>>>
>>> Clearly it would be optional. But it would be beneficial.
>>>
>>> My proposal would:
>>>
>>> 1. Introduce @mark as a special module attribute recognized by the
>>> Elixir compiler
>>> 2. Enable IDE/editor integration for code navigation and folding
>>> based on these marks
>>> 3. Potentially allow documentation tools like ExDoc to use these
>>> marks in module documentation
>>>
>>> The primary benefit would be improved code organization and readability
>>> in larger modules where related functions need to stay together but would
>>> benefit from visual separation and navigation support.
>>> Thoughts?
>>>
>>> I'm not asking someone to write this for me... but would like to
>>> understand if something like this would be accepted before working on it.
>>>
>>> Thanks,
>>>
>>> Mark
>>>
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>>>
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>
>
> --
> Austin Ziegler • halos...@gmail.com • aus...@halostatue.ca
> http://www.halostatue.ca/ • http://twitter.com/halostatue
>
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