bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

[Liang-Jie Lee]

Slurping is the operation to expand current S-expression by pulling in
the next outer S-expression, for example (| is cursor):

(foo (bar |baz) abc efg) -> (foo (bar |baz abc) efg)

Barfing is the opposite, contracting the S-expression by pushing out
it's last-most form, for example:

(foo (bar |baz abc) efg) -> (foo (bar |baz) abc efg)

These operations are provided by many third party packages like paredit,
smartparen, lispy, etc. Many people find it useful (especially when
you want to wrap several expressions into a `let` form), so I propose to
have these operations built in.

bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

[Eduardo Ochs]

On Fri, 16 Jul 2021 at 13:14, Liang-Jie Lee <s930054123yaoyao@gmail.com> wrote:
>
>
> Slurping is the operation to expand current S-expression by pulling in
> the next outer S-expression, for example (| is cursor):
>
> (foo (bar |baz) abc efg) -> (foo (bar |baz abc) efg)
>
> Barfing is the opposite, contracting the S-expression by pushing out
> it's last-most form, for example:
>
> (foo (bar |baz abc) efg) -> (foo (bar |baz) abc efg)
>
> These operations are provided by many third party packages like paredit,
> smartparen, lispy, etc. Many people find it useful (especially when
> you want to wrap several expressions into a `let` form), so I propose to
> have these operations built in.


Hint: if you change that to "How do I implement these operations? I am
using the modes such and such to edit Lisp" and send that changed
message to html-gnu-emacs you can have these functionalities in a few
hours or days instead of in a few months...

  Cheers,
    Eduardo Ochs
    http://angg.twu.net/#eev

bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

[Lars Ingebrigtsen]

Liang-Jie Lee <s930054123yaoyao@gmail.com> writes:

> Slurping is the operation to expand current S-expression by pulling in
> the next outer S-expression, for example (| is cursor):
>
> (foo (bar |baz) abc efg) -> (foo (bar |baz abc) efg)
>
> Barfing is the opposite, contracting the S-expression by pushing out
> it's last-most form, for example:
>
> (foo (bar |baz abc) efg) -> (foo (bar |baz) abc efg)

I'm not quite sure what the request is here -- to add key bindings for
`paredit-forward-slurp-sexp' and `paredit-forward-barf-sexp' to
`emacs-lisp-mode?  (Or `lisp-mode-shared-map', I guess...)

I'm not sure these are commands that are generally used that much to
warrant doing that, and I think people that are really into these things
just enable paredit mode (or something similar).

But I may be wrong in that -- if there's a clamouring for these commands
having a key binding in Lispish modes, I wouldn't be against adding
them.  What do the rest of you people think?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

Could we please not call it "barfing"?
Perhaps "expelling"?

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

bug#49598: 28.0.50; [Feature Request] Support slurping and barfing operations in lisp-mode

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I'm not quite sure what the request is here -- to add key bindings for
> `paredit-forward-slurp-sexp' and `paredit-forward-barf-sexp' to
> `emacs-lisp-mode?  (Or `lisp-mode-shared-map', I guess...)
>
> I'm not sure these are commands that are generally used that much to
> warrant doing that, and I think people that are really into these things
> just enable paredit mode (or something similar).
>
> But I may be wrong in that -- if there's a clamouring for these commands
> having a key binding in Lispish modes, I wouldn't be against adding
> them.  What do the rest of you people think?

Nobody seemed to want to hoist these functions up from paredit, and they
work fine where they are, so I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no