From: "bradgessler (Brad Gessler) via ruby-core" <ruby-core@...>
Date: 2024-06-04T22:23:19+00:00
Subject: [ruby-core:118179] [Ruby master Feature#19458] Expose HEREDOC identifier

Issue #19458 has been updated by bradgessler (Brad Gessler).


I'm working with some code in Phlex that would benefit from introspecting the name of the HEREDOC. Here's what I currently have:

```ruby
        ContentSlide(title: "Why Phlex?"){
          Markdown <<~MARKDOWN

          * Because its fun
          * Because its super-de-dooper
          MARKDOWN
        }
```

The `Markdown <<~MARKDOWN` line feels like it came from the redundancy department of redundancy. I would do this:

```ruby
        ContentSlide(title: "Why Phlex?"){
          Markdown %{
          * Because its fun
          * Because its super-de-dooper
        }
```

But there's no `%{}` type blocks that deal with indents like HEREDOCS.



----------------------------------------
Feature #19458: Expose HEREDOC identifier
https://bugs.ruby-lang.org/issues/19458#change-108626

* Author: joelhawksley (Joel Hawksley)
* Status: Open
----------------------------------------
I���d like to have access to the HEREDOC identifier.

In the ViewComponent framework I help maintain, we added a method to declare a template as such:

```ruby
class Component
  erb_template <<~ERB
    <h1>Hello, <%= @name %>!</h1>
  ERB
end
```

I'd prefer to be able to write:

```ruby
class Component
  template <<~ERB
    <h1>Hello, <%= @name %>!</h1>
  ERB
end
```

And be able to see that the argument passed to `.template` was from a HEREDOC with an `ERB` identifier, which would allow me to use the correct template handler to compile the template.

I could see this being implemented:

1) As a new property of String, such as `identifier` or `heredoc_identifier`.
2) By having HEREDOCs return a subclass of String that includes an `identifier` property.

I'd be happy to work on implementing this change.

---Files--------------------------------
clipboard-202302251947-5owjc.png (16.4 KB)


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