[bug#48729] [PATCH v5 24/25] gnu: Add bitmask.

[Maxime Devos]

Raghav Gururajan schreef op zo 20-06-2021 om 05:52 [-0400]:
> Hi Maxime!
> 
> > Snippets can be G-expressions. Personally, I'd go with a G-expression
> > instead of an S-expression, because
> > 
> > * that makes it more obvious it is staged code, and not, say, SXML
> > * G-exps are cool [citation needed]
> > 
> > > +    (build-system go-build-system)
> > > +    (arguments [...])
> 
> I see. Would you be able to illustrate with a snippet please? I haven't 
> used G-exps much.

Here's an example, from the guile-2.2 package, using a S-exp:

              (snippet '(begin
                          (for-each delete-file
                                    (find-files "prebuilt" "\\.go$"))
                          #t))))

and equivalently, using a G-exp

              (snippet #~(begin
                           (for-each delete-file
                                     (find-files "prebuilt" "\\.go$"))
                           #t))))

Basically, replace the ' with #~.
Here, using a G-exp doesn't buy much though, besides making it
a bit more obvious the code is staged.  G-exps can be useful
if, say, 'sed' or 'tar' or something needs to be run during
the snippet. (E.g., something like
#~(invoke* #+(file-append tar "/bin/tar") args ...))

Greetings,
Maxime

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