Implement subfeatures in packages

[Heime <heimeborgia@protonmail.com>]

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On Monday, August 5th, 2024 at 1:20 AM, Heime <heimeborgia@protonmail.com> wrote:

> On Monday, August 5th, 2024 at 12:09 AM, Heime heimeborgia@protonmail.com wrote:
> 
> > Reading the documentation string, one can use subfeatures. I would like to have
> > some code examples to help me implement subfeatures in my own packages.
> > 
> > (provide FEATURE &optional SUBFEATURES)
> > 
> > Announce that FEATURE is a feature of the current Emacs.
> > The optional argument SUBFEATURES should be a list of symbols listing
> > particular subfeatures supported in this version of FEATURE.
> 
> 
> I want a package "tema" to provide subfeatures "lumi" and "mast"
> 
> (provide 'tema '(lumi mast))
> 
> And set up files "lumi.el" and "mast.el" for the subfeatures.
> Each of the two will include a "provide" clause at the end.
> 
> What would the provide clause look like ?

Currently I have

;; file lumi.el
;; code here
(provide 'tema '(lumi))
;; end of file lumi.el

;; ---------

;; file mast.el
;; code here
(provide 'tema '(mast))
;; end of file mast.el

;; ---------

How can the contents of lumi.el and mast.el be included in the
package defined in tema.el ?  Just using the canonical (require 'lumi)
and (require 'mast) gives (error "Loading file lumi.el

;; file tema.el
;; code here
(require 'lumi)  ;
(require 'mast)  ;

(provide 'tema '(lumi mast))
;; end of file mast.el