From: "rubyFeedback (robert heiler) via ruby-core" <ruby-core@...>
Date: 2023-02-27T12:33:41+00:00
Subject: [ruby-core:112616] [Ruby master Feature#19458] Expose HEREDOC identifier

Issue #19458 has been updated by rubyFeedback (robert heiler).





I have no particularly strong opinion either way.



But I wanted to comment on zverok's statement:



> [...] use the possibility to "tag" strings, and if Ruby

> will give the access to this "tag", it might find many

> good usages.



I agree somwhat with that opinion too.



For instance, I also suggested to propose an extension to case/when

"interfaces" where we can not only access all case/when entries in

a given method (perhaps only for non-private methods), and merge 

different case/when entries, as well as adding methods such as 

.to_h or .to_hash to convert it to a hash, and/or to a proc object,

and .call() on it.



My original use case for this, several years ago, was to be able to

autogenerated tab-completion for shells such as bash and zsh. So 

that I can know all entries in a case/when menu. For instance:



    case x

    when 'a','b','c'

      'foobar' # all three match to foobar, similar to a Hash where the

               # three keys 'a','b' and 'c' would point to 'foobar'

    end



Since then case/when menu got even better support - see pattern

matching.



Anyway - making a good proposal that is not-trivial, is quite difficult 

actually, so I kind of dropped it, hoping that someone else may find the

motivation to do a good proposal here one day. :D



So, to come to this issue - I think if you look at it from an extended

point of view, then being able to know associated use cases could indeed

be interesting, so on that topic I concur with zverok. That does not 

mean I am in favour of the suggestion here, or in disfavour - I just think

it may indeed be worthy to explore use case here. I have not had a huge

need to use ERB per se, but I do happen to read in a .md file 



----------------------------------------

Feature #19458: Expose HEREDOC identifier

https://bugs.ruby-lang.org/issues/19458#change-102062



* Author: joelhawksley (Joel Hawksley)

* Status: Open

* Priority: Normal

----------------------------------------

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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