GNU bug report logs - #72334
[PATCH] Always print commas and comma-ats specially

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Package: emacs; Reported by: Thuna <thuna.cing@HIDDEN>; Keywords: patch; dated Sun, 28 Jul 2024 13:34:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
To: Andreas Schwab <schwab@HIDDEN>
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Andreas Schwab <schwab@HIDDEN> writes:

> On Feb 11 2025, Stefan Kangas wrote:
>
>> BTW, I note that while in ELisp
>>
>>     ,bar
>>
>> prints as
>>
>>     (\, bar)
>
> (car ',bar) => \,
>
>> in Scheme it prints as the somewhat nicer
>>
>>     (unquote bar)
>
> (car ',bar) => unquote
>
> They just use different symbols to implement the \, reader macro.

Yes, of course.  I'm saying that ours is.. less pretty.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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To: Stefan Kangas <stefankangas@HIDDEN>
Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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On Feb 11 2025, Stefan Kangas wrote:

> BTW, I note that while in ELisp
>
>     ,bar
>
> prints as
>
>     (\, bar)

(car ',bar) => \,

> in Scheme it prints as the somewhat nicer
>
>     (unquote bar)

(car ',bar) => unquote

They just use different symbols to implement the \, reader macro.

-- 
Andreas Schwab, SUSE Labs, schwab@HIDDEN
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
To: Thuna <thuna.cing@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
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Thuna <thuna.cing@HIDDEN> writes:

>> Thuna, I didn't study your patch very deeply yet but the first thing
>> that stands out is that there are no tests.  Any chance you could look
>> into that?
>
> Sure.  It's somewhat late here so I'll write those tomorrow.

Thanks!

> What should quote and function do?  That is, should it be (foo . 'bar)
> or (foo quote bar)?

I don't have a strong opinion on that.  A priori, I think what we have
now is fine, but let's see what other people think.

BTW, I note that while in ELisp

    ,bar

prints as

    (\, bar)

in Scheme it prints as the somewhat nicer

    (unquote bar)
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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From: Thuna <thuna.cing@HIDDEN>
To: Stefan Kangas <stefankangas@HIDDEN>, Stefan Monnier
 <monnier@HIDDEN>
Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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--=-=-=
Content-Type: text/plain

> Thanks.
>
> Thuna, I didn't study your patch very deeply yet but the first thing
> that stands out is that there are no tests.  Any chance you could look
> into that?

Sure.  It's somewhat late here so I'll write those tomorrow.  What
should quote and function do?  That is, should it be (foo . 'bar) or
(foo quote bar)?

The important thing is, though, I actually took a look at the patch
since it's been a while, and I was wrong, what I explained was bug
72434, which I've also attached here.

This patch _actually_ makes it so that (\, foo) [and (\,@ foo)] is
printed as ",foo" in every context, whereas it current prints like that
only if we are inside a quasiquoted form [that is, (\` (\, (\, foo))
prints as "`,(\, foo)"].

[If you're trying the other patch, I should note here as well that that
one builds on top of this one, so the results are incorrect if you only
apply that.  Specifically, when we're not in a backquote, (foo . ,bar)
prints as (foo . (\, bar)) instead.]


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Print-list-terminating-backquote-and-comma-forms-spe.patch

From 4cea5d48a772870df40f7d33fc0a87cdcfc9bbc1 Mon Sep 17 00:00:00 2001
From: Thuna <thuna.cing@HIDDEN>
Date: Sat, 3 Aug 2024 03:17:49 +0200
Subject: [PATCH] Print list terminating backquote and comma forms specially

* src/print.c (print_object): When `print-quoted' is non-nil print a
list-terminating (\` obj) as though it terminates the list with a " . "
---
 src/print.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/print.c b/src/print.c
index 256f19aeb90..d654ab76799 100644
--- a/src/print.c
+++ b/src/print.c
@@ -2656,7 +2656,13 @@ print_object (Lisp_Object obj, Lisp_Object printcharfun, bool escapeflag)
 		--print_depth;
 		goto next_obj;
 	      }
-	    else if (CONSP (next))
+	    else if (CONSP (next)
+		     && !(print_quoted
+			  && (EQ (Qbackquote, XCAR (next))
+			      || EQ (Qcomma, XCAR (next))
+			      || EQ (Qcomma_at, XCAR (next)))
+			  && CONSP (XCDR (next))
+			  && NILP (XCDR (XCDR (next)))))
 	      {
 		if (!NILP (Vprint_circle))
 		  {
-- 
2.44.2


--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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Stefan Monnier <monnier@HIDDEN> writes:

>>>> Could you please summarize the issue that this is intended to fix?
>>> (cons 'foo (list '\, 'bar)) should be printed as (foo . ,bar) instead of
>>> (foo \, bar).  Same for (foo . ,@bar) and (foo . `bar), and maybe even
>>> (foo . 'bar) and (foo . #'bar).
>> Stefan M, any comments?
>
> I haven't looked at the patch, but the goes above sounds good.
> It doesn't occur very often in my experience, but when it occurs it does
> look odd and can easily confuse the reader.

Thanks.

Thuna, I didn't study your patch very deeply yet but the first thing
that stands out is that there are no tests.  Any chance you could look
into that?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Stefan Kangas <stefankangas@HIDDEN>
Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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>>> Could you please summarize the issue that this is intended to fix?
>> (cons 'foo (list '\, 'bar)) should be printed as (foo . ,bar) instead of
>> (foo \, bar).  Same for (foo . ,@bar) and (foo . `bar), and maybe even
>> (foo . 'bar) and (foo . #'bar).
> Stefan M, any comments?

I haven't looked at the patch, but the goes above sounds good.
It doesn't occur very often in my experience, but when it occurs it does
look odd and can easily confuse the reader.


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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Thuna <thuna.cing@HIDDEN> writes:

>> Could you please summarize the issue that this is intended to fix?
>
> (cons 'foo (list '\, 'bar)) should be printed as (foo . ,bar) instead of
> (foo \, bar).  Same for (foo . ,@bar) and (foo . `bar), and maybe even
> (foo . 'bar) and (foo . #'bar).

Stefan M, any comments?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

Message received at 72334 <at> debbugs.gnu.org:


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From: Thuna <thuna.cing@HIDDEN>
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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
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> Could you please summarize the issue that this is intended to fix?

(cons 'foo (list '\, 'bar)) should be printed as (foo . ,bar) instead of
(foo \, bar).  Same for (foo . ,@bar) and (foo . `bar), and maybe even
(foo . 'bar) and (foo . #'bar).
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

Message received at 72334 <at> debbugs.gnu.org:


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Subject: Re: bug#72334: [PATCH] Always print commas and comma-ats specially
To: Thuna <thuna.cing@HIDDEN>
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Thuna <thuna.cing@HIDDEN> writes:

> In 55481 the recursion was fixed but backquotes and comma(-at)s were
> left as-is, so as to print comma(-at)s specially only if they are
> escaping a backquote.
>
> This is not particularly useful (and I would argue is bad), so something
> like the attached patch could be a good starting point to make it so
> that they are always printed specially (given `print-quoted' is non-nil
> and it is a proper list of length two - the usual checks for other
> quoted forms), which also solves(maybe? - it was not the primary goal)
> the recursion.  Feel free to change or drop whatever.

Could you please summarize the issue that this is intended to fix?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Thuna <thuna.cing@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: [PATCH] Always print commas and comma-ats specially
Date: Sun, 28 Jul 2024 15:30:40 +0200
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--=-=-=
Content-Type: text/plain

In 55481 the recursion was fixed but backquotes and comma(-at)s were
left as-is, so as to print comma(-at)s specially only if they are
escaping a backquote.

This is not particularly useful (and I would argue is bad), so something
like the attached patch could be a good starting point to make it so
that they are always printed specially (given `print-quoted' is non-nil
and it is a proper list of length two - the usual checks for other
quoted forms), which also solves(maybe? - it was not the primary goal)
the recursion.  Feel free to change or drop whatever.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Always-print-commas-and-comma-ats-specially-with-pri.patch

From bdb1af8498b523c7e80a02675035037884a2f1d0 Mon Sep 17 00:00:00 2001
From: Thuna <thuna.cing@HIDDEN>
Date: Sun, 28 Jul 2024 14:45:40 +0200
Subject: [PATCH] Always print commas and comma-ats specially with print-quoted

---
 src/print.c | 47 +++++++++++++++--------------------------------
 1 file changed, 15 insertions(+), 32 deletions(-)

diff --git a/src/print.c b/src/print.c
index 8f28b14e8b6..256f19aeb90 100644
--- a/src/print.c
+++ b/src/print.c
@@ -2488,43 +2488,26 @@ print_object (Lisp_Object obj, Lisp_Object printcharfun, bool escapeflag)
 	  && print_depth > XFIXNUM (Vprint_level))
 	print_c_string ("...", printcharfun);
       else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
-	       && EQ (XCAR (obj), Qquote))
+	       && (EQ (XCAR (obj), Qquote) ||
+		   EQ (XCAR (obj), Qfunction) ||
+		   EQ (XCAR (obj), Qbackquote) ||
+		   EQ (XCAR (obj), Qcomma) ||
+		   EQ (XCAR (obj), Qcomma_at)))
 	{
-	  printchar ('\'', printcharfun);
+	  if (EQ (XCAR (obj), Qquote))
+	    printchar ('\'', printcharfun);
+	  else if (EQ (XCAR (obj), Qfunction))
+	    print_c_string("#'", printcharfun);
+          else if (EQ (XCAR (obj), Qbackquote))
+	    printchar ('`', printcharfun);
+          else if (EQ (XCAR (obj), Qcomma))
+	    printchar (',', printcharfun);
+          else if (EQ (XCAR (obj), Qcomma_at))
+	    print_c_string (",@", printcharfun);
 	  obj = XCAR (XCDR (obj));
 	  --print_depth;	/* tail recursion */
 	  goto print_obj;
 	}
-      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
-	       && EQ (XCAR (obj), Qfunction))
-	{
-	  print_c_string ("#'", printcharfun);
-	  obj = XCAR (XCDR (obj));
-	  --print_depth;	/* tail recursion */
-	  goto print_obj;
-	}
-      /* FIXME: Do we really need the new_backquote_output gating of
-	 special syntax for comma and comma-at?  There is basically no
-	 benefit from it at all, and it would be nice to get rid of
-	 the recursion here without additional complexity.  */
-      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
-	       && EQ (XCAR (obj), Qbackquote))
-	{
-	  printchar ('`', printcharfun);
-	  new_backquote_output++;
-	  print_object (XCAR (XCDR (obj)), printcharfun, escapeflag);
-	  new_backquote_output--;
-	}
-      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
-	       && (EQ (XCAR (obj), Qcomma)
-		   || EQ (XCAR (obj), Qcomma_at))
-	       && new_backquote_output)
-	{
-	  print_object (XCAR (obj), printcharfun, false);
-	  new_backquote_output--;
-	  print_object (XCAR (XCDR (obj)), printcharfun, escapeflag);
-	  new_backquote_output++;
-	}
       else
 	{
 	  printchar ('(', printcharfun);
-- 
2.44.2


--=-=-=--
Acknowledgement sent to Thuna <thuna.cing@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#72334; Package emacs. Full text available.
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