bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Vladimir Nikishkin]

Honourable Emacs developers.

As Emacs Lisp is becoming more and more a general purpose and high
performance language, would the development team consider extending the
Emacs Lisp reader syntax to allow for a more flexible kind of comments?

A formal specification can be found at
https://srfi.schemers.org/srfi-62/srfi-62.html

However, and informal specification would be illustrated by the
following example:

```
#;(defvar demo-variable nil
  "This is a demo-variable declared to illustrate SRFI-62.")
```

The special reader syntax "#;" means "please, ignore the next valid
s-expression completely".
The comment itself is almost and s-expression, which allows to maintain
full homoiconicity of the source file, and manipulate the comment
contents easier.

I hope that this proposal may be useful not just for me, but for other
Emacs Lisp developers.

In GNU Emacs 27.1 (build 1, x86_64-slackware-linux-gnu, GTK+ Version 3.24.22)
 of 2020-08-12 built on z-mp.slackware.lan
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Slackware 14.2 x86_64 (post 14.2 -current)

Recent messages:
Wrote /home/lockywolf/.emacs.d/init.el
Auto-saving...done
Mark set [2 times]
Saving file /home/lockywolf/.emacs.d/init.el...
Wrote /home/lockywolf/.emacs.d/init.el
(No changes need to be saved)
Found ‘; for commenting’ in Index.  (17 total; use ‘,’ for next)
[mu4e] Indexing... processed 270000, updated 0
scroll-up-command: End of buffer
[mu4e] Indexing completed; processed 270070, updated 0, cleaned-up 0
Quit
Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
--program-prefix= --program-suffix= --mandir=/usr/man
--infodir=/usr/info --without-gconf --without-gsettings --with-modules
--with-x --with-x-toolkit=gtk3 --build=x86_64-slackware-linux
'CFLAGS=-O2 -fPIC''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GLIB NOTIFY INOTIFY ACL GNUTLS
LIBXML2 FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM
MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
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/home/lockywolf/.emacs.d/elpa/org-20201102/org-feed hides /usr/share/emacs/27.1/lisp/org/org-feed
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/home/lockywolf/.emacs.d/elpa/org-20201102/ob-perl hides /usr/share/emacs/27.1/lisp/org/ob-perl
/home/lockywolf/.emacs.d/elpa/org-20201102/ob-org hides /usr/share/emacs/27.1/lisp/org/ob-org
/home/lockywolf/.emacs.d/elpa/org-20201102/ob-octave hides /usr/share/emacs/27.1/lisp/org/ob-octave
/home/lockywolf/.emacs.d/elpa/org-20201102/ob-ocaml hides /usr/share/emacs/27.1/lisp/org/ob-ocaml
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/home/lockywolf/.emacs.d/elpa/org-20201102/ob-latex hides /usr/share/emacs/27.1/lisp/org/ob-latex
/home/lockywolf/.emacs.d/elpa/org-20201102/ob-js hides /usr/share/emacs/27.1/lisp/org/ob-js
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Features:
(shadow emacsbug magit-utils reftex-auc reftex-dcr reftex-global
reftex-index reftex-ref reftex-parse reftex-sel reftex-toc debug
backtrace dired-aux finder skeleton hippie-exp expand ecb-speedbar
ecb-layout ecb-create-layout ecb-compilation ecb-common-browser
ecb-navigate ecb-mode-line ecb-face tree-buffer ecb-cedet-wrapper
ecb-util ede/dired cus-dep autoload cus-theme eieio-opt cl-print
bib-cite auctex-lua lua-mode mm-archive gnutls network-stream url-cache
org-clock lisp-mnt time-stamp misearch multi-isearch ffap view cal-china
lunar solar cal-dst cal-bahai cal-islam cal-hebrew holidays hol-loaddefs
diary-lib diary-loaddefs cal-iso org-duration image-file org-eldoc
cdlatex ol-eww eww mm-url ol-rmail ol-mhe ol-irc ol-info ol-gnus nnir
gnus-sum shr svg dom gnus-group gnus-undo gnus-start gnus-cloud nnimap
nnmail mail-source utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int
gnus-range gnus-win gnus nnheader ol-docview ol-bbdb ol-w3m org-habit
face-remap company-oddmuse company-keywords company-etags company-gtags
company-dabbrev-code company-dabbrev company-files company-clang
company-capf company-cmake company-semantic company-template
company-bbdb erc-xdcc erc-track erc-spelling flyspell erc-sound
erc-services erc-ring erc-page erc-desktop-notifications erc-notify
erc-networks erc-netsplit erc-menu erc-match erc-log erc-list erc-identd
erc-dcc erc-pcomplete erc-capab erc-button erc-fill erc-stamp erc-join
hideshow autoinsert ispell bibtex-utils auctex-latexmk tex-buf latex
latex-flymake flymake-proc flymake tex-ispell tex-style tex texmathp
org-noter-pdftools org-pdftools pdf-occur ibuf-ext ibuffer
ibuffer-loaddefs pdf-isearch pdf-annot tablist tablist-filter
semantic/wisent/comp pdf-misc imenu org-id org-noter pdf-tools pdf-view
bookmark pdf-cache pdf-info tq pdf-util org-ref org-ref-helm-bibtex
org-ref-helm helm-utils helm-bibtex bibtex-completion org-capture biblio
biblio-download biblio-dissemin biblio-ieee biblio-hal biblio-dblp
biblio-crossref biblio-arxiv biblio-doi biblio-core let-alist url-queue
helm-net helm-help helm-config org-ref-core warnings reftex-cite
org-ref-glossary org-ref-bibtex semantic/tag-file form-feed
semantic/db-file data-debug cedet-files org-ref-citeproc key-chord hydra
lv doi-utils org-ref-utils org-ref-pdf url-http url url-proxy
url-privacy url-expand url-methods url-history mailcap url-auth
url-cookie url-domsuf url-util url-gw nsm ol-bibtex htmlize f s org-ebib
ebib ebib-reading-list ebib-notes ebib-filters ebib-keywords ebib-utils
ebib-db parsebib crm bibtex reftex reftex-loaddefs reftex-vars khardel
yaml-mode vdirel helm async-bytecomp helm-global-bindings helm-easymenu
helm-source eieio-compat helm-multi-match helm-lib async org-vcard
sauron-ams-org sauron-elfeed sauron-identica sauron-jabber sauron-mu4e
sauron-twittering sauron-notifications notifications sauron-org
sauron-erc erc-goodies erc erc-backend erc-compat erc-loaddefs
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ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
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custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 2640822 123710)
 (symbols 48 69587 1)
 (strings 32 348665 27737)
 (string-bytes 1 11746856)
 (vectors 16 122136)
 (vector-slots 8 2341003 99070)
 (floats 8 1192 508)
 (intervals 56 142598 3435)
 (buffers 1000 38))

-- 
Vladimir Nikishkin (MiEr, lockywolf)
(Laptop)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Lars Ingebrigtsen]

Vladimir Nikishkin <lockywolf@gmail.com> writes:

> #;(defvar demo-variable nil
>   "This is a demo-variable declared to illustrate SRFI-62.")
> ```
>
> The special reader syntax "#;" means "please, ignore the next valid
> s-expression completely".

Sexp-based comments would certainly be nice, but I wonder whether
comment blocks would be even more useful (if we have to prioritise):

#| this is
a comment |#

The advantage is that you don't have to have syntactically valid things
in comment blocks, while #; requires that you do.  #; also looks like
slightly hard to read if you do stuff like

(foo #;(foobar
        ...
        1)
     zot)

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

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Vladimir Nikishkin]

[-- Attachment #1: Type: text/plain, Size: 1348 bytes --]

Well, fontification usually solves the problem of "slightly hard to read"
for me, because it's usually very different in co colour.

Speaking of block comments, I have no opinion about that. The point of
s-comments is exactly that they keep sexp syntax intact.
Block comments are not expected to do that (even for the human languages
within the comments).

--
Yours sincerely, Vladimir Nikishkin
(Sent with Google mail mobile.)

Lars Ingebrigtsen <larsi@gnus.org> 于 2020年11月10日周二 22:57写道：

> Vladimir Nikishkin <lockywolf@gmail.com> writes:
>
> > #;(defvar demo-variable nil
> >   "This is a demo-variable declared to illustrate SRFI-62.")
> > ```
> >
> > The special reader syntax "#;" means "please, ignore the next valid
> > s-expression completely".
>
> Sexp-based comments would certainly be nice, but I wonder whether
> comment blocks would be even more useful (if we have to prioritise):
>
> #| this is
> a comment |#
>
> The advantage is that you don't have to have syntactically valid things
> in comment blocks, while #; requires that you do.  #; also looks like
> slightly hard to read if you do stuff like
>
> (foo #;(foobar
>         ...
>         1)
>      zot)
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>

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bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Francesco Potortì]

>```
>#;(defvar demo-variable nil
>  "This is a demo-variable declared to illustrate SRFI-62.")
>```
>
>The special reader syntax "#;" means "please, ignore the next valid
>s-expression completely".

I have always dreamt of this :)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Drew Adams]

> I wonder whether comment blocks would be even more useful
> (if we have to prioritise):
> 
> #| this is
> a comment |#
> 
> The advantage is that you don't have to have syntactically valid things
> in comment blocks, while #; requires that you do.  #; also looks like
> slightly hard to read if you do stuff like
> 
> (foo #;(foobar
>         ...
>         1)
>      zot)

+1 for Common-Lisp block comments.

(And for reader macros, FWIW...)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Jean Louis]

* Lars Ingebrigtsen <larsi@gnus.org> [2020-11-10 18:03]:
> Vladimir Nikishkin <lockywolf@gmail.com> writes:
> 
> > #;(defvar demo-variable nil
> >   "This is a demo-variable declared to illustrate SRFI-62.")
> > ```
> >
> > The special reader syntax "#;" means "please, ignore the next valid
> > s-expression completely".
> 
> Sexp-based comments would certainly be nice, but I wonder whether
> comment blocks would be even more useful (if we have to prioritise):
> 
> #| this is
> a comment |#

Voting for CL comment blocks.

It will increase documenting ability of Emacs.

I am using such to accept input from customers online, their human
readable data is shown in the comment blocks, and it is all LISP data
that can be processed.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Jose A. Ortega Ruiz]

since people are voting, here's my +1 for sexp (#;) comments.  i've been
programming in languages that have them almost daily for the last ten
years, and find them invaluable, and better than block comments.

for me, their main advantages are that i commonly have my point at the
beginning of the sexp and don't need to move around to comment it out,
and that they can nest very easily (by that i mean that #;#; would
comment out the next 2 sexps, and so on).  

sexp comments also combine nicely with the fact that most of my
movements over lispy code are sexp-based, and help me not commenting out
by mistake closing parens.

in the much fewer occasions i need a block comment, it's normally easy
to use comment-region, and packages like paredit help there.

(of course if we end up having only block comments, it's trivial writing
an emacs command commenting out the next n sexps using them (or, heck,
even /not/ using them) so i'm fine either way at the end of the day.)

cheers,
jao
-- 
And what should they know of England who only England know? - Kipling

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[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. ]]]

  > > #| this is
  > > a comment |#

  > Voting for CL comment blocks.

Before deciding to add any syntax to Emacs Lisp,
we must make sure that all the Lisp-parsing commands
can handle them.

If some other Lisp mode handles them already, that suggests
it won't be hard; but we have to verify it works in the context of Emacs Lisp mode before making the decision to add that synatx to EMacs Lisp.

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

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Jean Louis]

* Richard Stallman <rms@gnu.org> [2020-11-11 08:42]:
> [[[ 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. ]]]
> 
>   > > #| this is
>   > > a comment |#
> 
>   > Voting for CL comment blocks.
> 
> Before deciding to add any syntax to Emacs Lisp, we must make sure
> that all the Lisp-parsing commands can handle them.
> 
> If some other Lisp mode handles them already, that suggests it won't
> be hard; but we have to verify it works in the context of Emacs Lisp
> mode before making the decision to add that synatx to EMacs Lisp.

Oh, yes! Thank you, it is understandable. In addition it would cause
many compatibility problems with outside packages and previous
versions of Emacs. 

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Vladimir Nikishkin]

Just to clarify,

I am not asking that exactly the syntax of srfi-62 as it is be added.
(Although Emacs Lisp already uses #'symbol as a reader-syntax switch,
so I suspect that it is possible)
I am asking for _some_ syntax to comment out valid sexps, whichever
fits Emacs Lisp most.

Vlad

On Wed, 11 Nov 2020 at 15:46, Jean Louis <bugs@gnu.support> wrote:
>
> * Richard Stallman <rms@gnu.org> [2020-11-11 08:42]:
> > [[[ 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. ]]]
> >
> >   > > #| this is
> >   > > a comment |#
> >
> >   > Voting for CL comment blocks.
> >
> > Before deciding to add any syntax to Emacs Lisp, we must make sure
> > that all the Lisp-parsing commands can handle them.
> >
> > If some other Lisp mode handles them already, that suggests it won't
> > be hard; but we have to verify it works in the context of Emacs Lisp
> > mode before making the decision to add that synatx to EMacs Lisp.
>
> Oh, yes! Thank you, it is understandable. In addition it would cause
> many compatibility problems with outside packages and previous
> versions of Emacs.
>


-- 
Yours sincerely, Vladimir Nikishkin
(Sent from GMail web interface.)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Jean Louis]

* Vladimir Nikishkin <lockywolf@gmail.com> [2020-11-11 11:19]:
> Just to clarify,
> 
> I am not asking that exactly the syntax of srfi-62 as it is be added.
> (Although Emacs Lisp already uses #'symbol as a reader-syntax switch,
> so I suspect that it is possible)
> I am asking for _some_ syntax to comment out valid sexps, whichever
> fits Emacs Lisp most.

Would this work?

'(

)

Or there could be some macro to comment out anything:

(do-not-process

Put anything you wish here.

)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Andreas Schwab]

On Nov 11 2020, Vladimir Nikishkin wrote:

> I am asking for _some_ syntax to comment out valid sexps, whichever
> fits Emacs Lisp most.

The easiest way is to quote it.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Vladimir Nikishkin]

[-- Attachment #1: Type: text/plain, Size: 943 bytes --]

Well, as a "poor man's substitute". A quoted expression is still an
expression, and a macro can't expand to nothing, it will always expand to
at least an empty list.

I would still prefer a robust solution, even if it takes longer.

--
Yours sincerely, Vladimir Nikishkin
(Sent with Google mail mobile.)

Jean Louis <bugs@gnu.support> 于 2020年11月11日周三 21:57写道：

> * Vladimir Nikishkin <lockywolf@gmail.com> [2020-11-11 11:19]:
> > Just to clarify,
> >
> > I am not asking that exactly the syntax of srfi-62 as it is be added.
> > (Although Emacs Lisp already uses #'symbol as a reader-syntax switch,
> > so I suspect that it is possible)
> > I am asking for _some_ syntax to comment out valid sexps, whichever
> > fits Emacs Lisp most.
>
> Would this work?
>
> '(
>
> )
>
> Or there could be some macro to comment out anything:
>
> (do-not-process
>
> Put anything you wish here.
>
> )
>
>

[-- Attachment #2: Type: text/html, Size: 1447 bytes --]

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Mattias Engdegård]

mark-sexp (C-M-SPC) followed by comment-region already works, doesn't it? Not obvious that SRFI-62 comments would be substantially better.

I would very much like not having to update code that parses, lexes, searches, matches, pretty-prints, fontifies, navigates in, browses, indexes or otherwise recognises elisp surface syntax, that I have written over the years in various places -- at least not without a really good reason. Likely I'm not alone.

Sorry about the downbeat tone! I really don't mind syntax improvements, but here it seems unclear that the benefits would outweigh the costs.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Vladimir Nikishkin]

[-- Attachment #1: Type: text/plain, Size: 918 bytes --]

Well, if your parsers and fontifiers recognize #'symbol constructions,
wouldn't they recognise #; in almost the same way?

--
Yours sincerely, Vladimir Nikishkin
(Sent with Google mail mobile.)

Mattias Engdegård <mattiase@acm.org> 于 2020年11月12日周四 00:11写道：

> mark-sexp (C-M-SPC) followed by comment-region already works, doesn't it?
> Not obvious that SRFI-62 comments would be substantially better.
>
> I would very much like not having to update code that parses, lexes,
> searches, matches, pretty-prints, fontifies, navigates in, browses, indexes
> or otherwise recognises elisp surface syntax, that I have written over the
> years in various places -- at least not without a really good reason.
> Likely I'm not alone.
>
> Sorry about the downbeat tone! I really don't mind syntax improvements,
> but here it seems unclear that the benefits would outweigh the costs.
>
>

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bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Mattias Engdegård]

11 nov. 2020 kl. 17.14 skrev Vladimir Nikishkin <lockywolf@gmail.com>:

> Well, if your parsers and fontifiers recognize #'symbol constructions, wouldn't they recognise #; in almost the same way?

No, not without modification. For example, #; would be treated as # and a comment removing the rest of the line by most existing lexers.

And it's not just my code.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Jose A. Ortega Ruiz]

On Wed, Nov 11 2020, Andreas Schwab wrote:

> On Nov 11 2020, Vladimir Nikishkin wrote:
>
>> I am asking for _some_ syntax to comment out valid sexps, whichever
>> fits Emacs Lisp most.
>
> The easiest way is to quote it.

(+ 3 '2 1) -> 6
(+ 3 #;2 1) -> 4

(+ 3 '(+ 1 2)) -> error
(+ 3 #;(+ 1 2)) -> 3

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

> No, not without modification. For example, #; would be treated as #
> and a comment removing the rest of the line by most existing lexers.
>
> And it's not just my code.

Sure, it would be a new feature, and older lexers wouldn't understand
the new grammar, but that's true of (almost) any new language feature.
The question is whether this feature is useful enough to warrant the
pain inflicted, and...  I guess there isn't all that much enthusiasm for
it?  To me it sounds more like "that'd be neat" instead of "yeah, I can
see myself using it all the time".

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

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Drew Adams]

> > No, not without modification. For example, #; would be treated as #
> > and a comment removing the rest of the line by most existing lexers.
> > And it's not just my code.
> 
> Sure, it would be a new feature, and older lexers wouldn't understand
> the new grammar, but that's true of (almost) any new language feature.

If we had reader macros, and more generally a
user-configurable reader, like Common Lisp, then
maybe (?) users could adapt (e.g. disable or
whatever) such new constructs programmatically,
with Lisp.

Of course, if that were added then there would
at least be a one-time adaptation to it needed.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Juri Linkov]

>> > No, not without modification. For example, #; would be treated as #
>> > and a comment removing the rest of the line by most existing lexers.
>> > And it's not just my code.
>> 
>> Sure, it would be a new feature, and older lexers wouldn't understand
>> the new grammar, but that's true of (almost) any new language feature.
>
> If we had reader macros, and more generally a
> user-configurable reader, like Common Lisp, then
> maybe (?) users could adapt (e.g. disable or
> whatever) such new constructs programmatically,
> with Lisp.

I don't know if there is such a feature as transcompiling in Common Lisp
https://en.wikipedia.org/wiki/Source-to-source_compiler
but it should be possible to create a transpiler package that could help
to load Emacs Lisp files with newer syntax in older Emacs versions.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Drew Adams]

> > If we had reader macros, and more generally a
> > user-configurable reader, like Common Lisp, then
> > maybe (?) users could adapt (e.g. disable or
> > whatever) such new constructs programmatically,
> > with Lisp.
> 
> I don't know if there is such a feature as transcompiling in Common
> Lisp
> https://urldefense.com/v3/__https://en.wikipedia.org/wiki/Source-to-
> source_compiler__;!!GqivPVa7Brio!LRZ90JJlz_AJMQw1M9NIPUgK3V76G9TDlhLoGz
> KzsknMnjUYOaJNZ1i8rwnHKDDn$
> but it should be possible to create a transpiler package that could
> help to load Emacs Lisp files with newer syntax in older Emacs versions.

Interesting; thanks.

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Eduardo Ochs]

I use this a lot in my elip files, but with a space between the
initial apostrophe and the open perenthesis, like this:

;; A test:
' (let ((ee-youtubedl-dirs '("DIR1" "DIR2")))
    (find-youtubedl-links))

Without the space after the apostrophe a C-x C-e after the sexp would
just return the (let ...) instead of executing it. I like this trick
because it works anywhere and beginners understand it in seconds.

  Cheers,
    Eduardo Ochs
    http://angg.twu.net/#eev
    http://angg.twu.net/emacsconf2019.html


On Wed, 11 Nov 2020 at 10:59, Jean Louis <bugs@gnu.support> wrote:
>
> * Vladimir Nikishkin <lockywolf@gmail.com> [2020-11-11 11:19]:
> > Just to clarify,
> >
> > I am not asking that exactly the syntax of srfi-62 as it is be added.
> > (Although Emacs Lisp already uses #'symbol as a reader-syntax switch,
> > so I suspect that it is possible)
> > I am asking for _some_ syntax to comment out valid sexps, whichever
> > fits Emacs Lisp most.
>
> Would this work?
>
> '(
>
> )
>
> Or there could be some macro to comment out anything:
>
> (do-not-process
>
> Put anything you wish here.
>
> )

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Stefan Kangas]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> The question is whether this feature is useful enough to warrant the
> pain inflicted, and...  I guess there isn't all that much enthusiasm for
> it?  To me it sounds more like "that'd be neat" instead of "yeah, I can
> see myself using it all the time".

FWIW, I for one would appreciate SRFI-62 style comments.  I often find
myself commenting out otherwise valid sexps, and the added convenience
would be nice.  Just today I had a debugging session where they would
have definitely made things a bit more comfortable, especially given
that they nest easily.

That said, I won't exactly bring out the torches and pitchforks if the
proposal gets rejected.

(I don't have enough experience with Common Lisp to say much about the
#||#-comments.)

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Stefan Kangas <stefankangas@gmail.com> writes:

> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> The question is whether this feature is useful enough to warrant the
>> pain inflicted, and...  I guess there isn't all that much enthusiasm for
>> it?  To me it sounds more like "that'd be neat" instead of "yeah, I can
>> see myself using it all the time".
>
> FWIW, I for one would appreciate SRFI-62 style comments.  I often find
> myself commenting out otherwise valid sexps, and the added convenience
> would be nice.  Just today I had a debugging session where they would
> have definitely made things a bit more comfortable, especially given
> that they nest easily.
>
> That said, I won't exactly bring out the torches and pitchforks if the
> proposal gets rejected.
>
> (I don't have enough experience with Common Lisp to say much about the
> #||#-comments.)

My 2 cents,

I like the idea of a dedicated syntax to comment out sexps.

That said I believe `comment-dwim' solves already this problem to a good
degree for me.

given:

(foo (bar))

having as a region '(bar)' M-; produces

(foo ;; (bar)
     )

I indeed use it quite frequently.

  Andrea

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Stefan Kangas]

Andrea Corallo <akrl@sdf.org> writes:

> That said I believe `comment-dwim' solves already this problem to a good
> degree for me.
>
> given:
>
> (foo (bar))
>
> having as a region '(bar)' M-; produces
>
> (foo ;; (bar)
>      )

Indeed.

What's less fun is when you have to back the change out, or when you
want to incrementally comment out a nested sexp.  It works well, but
it's a wee bit fiddly.

For example, given:

(foo (bar ...
          (baz ...)))

With `comment-dwim', I might get something like:

(foo ;; (bar ...
     ;;      ;; (baz ...)
     ;;      )
     )

This would be more convenient:

(foo #;(bar ...
          #;(baz ...)))

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Stefan Kangas <stefankangas@gmail.com> writes:

> Andrea Corallo <akrl@sdf.org> writes:
>
>> That said I believe `comment-dwim' solves already this problem to a good
>> degree for me.
>>
>> given:
>>
>> (foo (bar))
>>
>> having as a region '(bar)' M-; produces
>>
>> (foo ;; (bar)
>>      )
>
> Indeed.
>
> What's less fun is when you have to back the change out, or when you
> want to incrementally comment out a nested sexp.  It works well, but
> it's a wee bit fiddly.
>
> For example, given:
>
> (foo (bar ...
>           (baz ...)))
>
> With `comment-dwim', I might get something like:
>
> (foo ;; (bar ...
>      ;;      ;; (baz ...)
>      ;;      )
>      )
>
> This would be more convenient:
>
> (foo #;(bar ...
>           #;(baz ...)))

Agree, that's one of the reasons why I agree would be nice to have ;)

As typically we do not commit commented code is no big deal as we
probably (at least I) revert the unnecessary diff hunks, but yeah would
be an improvement.  Also uncommenting would put the code in the initial
state instead of leaving unnecessary newlines.

  Andrea

bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[João Távora]

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On Tue, Nov 10, 2020, 17:22 Drew Adams <drew.adams@oracle.com> wrote:

> > I wonder whether comment blocks would be even more useful
> > (if we have to prioritise):
> >
> > #| this is
> > a comment |#
> >
> > The advantage is that you don't have to have syntactically valid things
> > in comment blocks, while #; requires that you do.  #; also looks like
> > slightly hard to read if you do stuff like
> >
> > (foo #;(foobar
> >         ...
> >         1)
> >      zot)
>
> +1 for Common-Lisp block comments.
>

+1. Let's not stray away from existing solutions.

(And for reader macros, FWIW...)
>

+2 Yep, just make a programmable reader.

Even without such a thing, reader conditionals are just what's requested
here.

João

>

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bug#44554: 27.1; Feature request: SRFI-62 style comments for Emacs Lisp.

[Tassilo Horn]

Stefan Kangas <stefankangas@gmail.com> writes:

> FWIW, I for one would appreciate SRFI-62 style comments.  I often find
> myself commenting out otherwise valid sexps, and the added convenience
> would be nice.

Same for me.  Some years ago when I've programmed in Clojure most of the
time which has those comments in the form of #_(+ 1 2 3), I found it
increadibly useful and convenient during experimentation with the code,
i.e., the ability to inactivate some part of a deeply nested form and
temporarily replace it with some alternative, switch back and forth,
etc.

Bye,
Tassilo