GNU bug report logs - #8150
23.2; cperl-uncomment-region is NOT an inverse of cperl-comment-region

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dima Kogan <dkogan <at> cds.caltech.edu>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.2; cperl-uncomment-region is NOT an inverse of cperl-comment-region
Date: Wed, 02 Mar 2011 00:52:24 -0800

If I have a buffer in CPerl mode containing

#!/usr/bin/perl
use strict;
use warnings;

cperl-comment-region on the whole buffer makes

# #!/usr/bin/perl
# use strict;
# use warnings;

cperl-uncomment-region makes

 #!/usr/bin/perl
 use strict;
 use warnings;

There's now an extra space at the start of the
line. cperl-uncomment-region is essentially the same as

(comment-region beg end -1)

This produces the erroneous behavior. (uncomment-region beg end) does
work, though. Thus, there may be a bug in (comment-region)





In GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-12-11 on brahms, modified by Debian
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Message #8 received at 8150 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Dima Kogan <dkogan <at> cds.caltech.edu>
Cc: 8150 <at> debbugs.gnu.org
Subject: Re: bug#8150: 23.2;
	cperl-uncomment-region is NOT an inverse of cperl-comment-region
Date: Wed, 02 Mar 2011 12:30:48 -0500

Dima Kogan wrote:

> cperl-comment-region on the whole buffer makes
[...]
> cperl-uncomment-region makes

The standard commands comment-region and uncomment-region seem to work
fine; can you use those instead?

Message #11 received at 8150 <at> debbugs.gnu.org (full text, mbox):

From: Dima Kogan <dkogan <at> cds.caltech.edu>
To: 8150 <at> debbugs.gnu.org
Subject: Re: bug#8150: 23.2; cperl-uncomment-region is NOT an inverse of
	cperl-comment-region
Date: Wed, 2 Mar 2011 20:38:16 -0800

I can and I do, but the current behavior seems wrong. If
(comment-region beg end -1) is no longer supported, it should generate
an error instead of succeeding badly. Should we simply call
(uncomment-region beg end 1) in that case? I can make the patch, but
would need to know what the current plan is.

Message #14 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Lawrence Mitchell <wence <at> gmx.li>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8150: 23.2;
	cperl-uncomment-region is NOT an inverse of cperl-comment-region
Date: Thu, 03 Mar 2011 10:06:53 +0000

Dima Kogan wrote:
> I can and I do, but the current behavior seems wrong. If
> (comment-region beg end -1) is no longer supported, it should generate
> an error instead of succeeding badly. Should we simply call
> (uncomment-region beg end 1) in that case? I can make the patch, but
> would need to know what the current plan is.

Note that the problem is that (uncomment-region A B 1) is not the
inverse of (comment-region A B 1).  Irrespective of the major
mode in effect:

emacs -Q

C-x h
C-1 M-x comment-region RET
C-x h
C-1 M-x uncomment-region RET

Note how there is now a space at the beginning of every line in
the *scratch* buffer.

This is due to the following code in uncomment-region-default:

|	  (if (null arg) (delete-region (point-min) (point))
|	    (skip-syntax-backward " ")
|	    (delete-char (- numarg))

   # foo bar
     ^ point is here when the above code is called.

If an argument is supplied, arg is non-nil and so to delete the
comment we first move backwards over whitespace and then delete
as many comment characters as specified by the argument (1 in
this case).

This patch appears to do the right thing from my minimal testing,
but I don't know if it will have any unfortunate side-effects:

2011-03-03  Lawrence Mitchell  <wence <at> gmx.li>

	Make uncomment-region the inverse of comment-region.

	* newcomment.el (uncomment-region-default): Delete
          skipped-over whitespace if all comment characters have
          been removed.

	This makes M-1 M-x uncomment-region RET the inverse of
	M-1 M-x comment-region RET.  Previously, commenting and
	then uncommenting a region with an argument would leave a
	space at the beginning of each line.

diff --git a/lisp/newcomment.el b/lisp/newcomment.el
index d88b76a..bcdc1e6 100644
--- a/lisp/newcomment.el
+++ b/lisp/newcomment.el
@@ -871,15 +871,20 @@ comment markers."
 	  (when (and sre (looking-at (concat "\\s-*\n\\s-*" srei)))
 	    (goto-char (match-end 0)))
 	  (if (null arg) (delete-region (point-min) (point))
-	    (skip-syntax-backward " ")
-	    (delete-char (- numarg))
-	    (unless (or (bobp)
-			(save-excursion (goto-char (point-min))
-					(looking-at comment-start-skip)))
-	      ;; If there's something left but it doesn't look like
-	      ;; a comment-start any more, just remove it.
-	      (delete-region (point-min) (point))))
-
+            (let* ((opoint (point-marker))
+                   (nchar (skip-syntax-backward " ")))
+              (delete-char (- numarg))
+              (unless (or (bobp)
+                          (save-excursion (goto-char (point-min))
+                                          (looking-at comment-start-skip)))
+                ;; If there's something left but it doesn't look like
+                ;; a comment-start any more, just remove it.
+                (delete-region (point-min) (point)))
+              (save-excursion
+                (goto-char (point-min))
+                (unless (looking-at comment-start-skip)
+                  (goto-char opoint)
+                  (delete-char nchar)))))
 	  ;; Remove the end-comment (and leading padding and such).
 	  (goto-char (point-max)) (comment-enter-backward)
 	  ;; Check for special `=' used sometimes in comment-box.


-- 
Lawrence Mitchell <wence <at> gmx.li>

Message #17 received at 8150 <at> debbugs.gnu.org (full text, mbox):

From: Lawrence Mitchell <wence <at> gmx.li>
To: 8150 <at> debbugs.gnu.org
Subject: Re: bug#8150: 23.2;
	cperl-uncomment-region is NOT an inverse of cperl-comment-region
Date: Fri, 17 Feb 2012 12:47:10 +0000

I'm chasing up open bugs I've participated in, probably too late
for 24.1, but just to see if anything's doing.  Is there any
objection to applying the patch in this bug report?

Lawrence Mitchell wrote:

[...]

> Note that the problem is that (uncomment-region A B 1) is not the
> inverse of (comment-region A B 1).  Irrespective of the major
> mode in effect:

> emacs -Q

> C-x h
> C-1 M-x comment-region RET
> C-x h
> C-1 M-x uncomment-region RET

> Note how there is now a space at the beginning of every line in
> the *scratch* buffer.

> This is due to the following code in uncomment-region-default:

> |	  (if (null arg) (delete-region (point-min) (point))
> |	    (skip-syntax-backward " ")
> |	    (delete-char (- numarg))

>    # foo bar
>      ^ point is here when the above code is called.

> If an argument is supplied, arg is non-nil and so to delete the
> comment we first move backwards over whitespace and then delete
> as many comment characters as specified by the argument (1 in
> this case).

Message #22 received at 8150-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Lawrence Mitchell <wence <at> gmx.li>
Cc: 8150-done <at> debbugs.gnu.org
Subject: Re: bug#8150: 23.2;
	cperl-uncomment-region is NOT an inverse of cperl-comment-region
Date: Fri, 17 Feb 2012 10:45:23 -0500

> I'm chasing up open bugs I've participated in, probably too late
> for 24.1, but just to see if anything's doing.  Is there any
> objection to applying the patch in this bug report?

I've simplified the patch and installed it (see below),


        Stefan


--- lisp/newcomment.el	2012-01-19 07:21:25 +0000
+++ lisp/newcomment.el	2012-02-17 15:41:15 +0000
@@ -872,14 +872,15 @@
 	  (when (and sre (looking-at (concat "\\s-*\n\\s-*" srei)))
 	    (goto-char (match-end 0)))
 	  (if (null arg) (delete-region (point-min) (point))
-	    (skip-syntax-backward " ")
+            (let* ((opoint (point-marker))
+                   (nchar (skip-syntax-backward " ")))
 	    (delete-char (- numarg))
-	    (unless (or (bobp)
+              (unless (and (not (bobp))
 			(save-excursion (goto-char (point-min))
 					(looking-at comment-start-skip)))
 	      ;; If there's something left but it doesn't look like
 	      ;; a comment-start any more, just remove it.
-	      (delete-region (point-min) (point))))
+                (delete-region (point-min) opoint))))
 
 	  ;; Remove the end-comment (and leading padding and such).
 	  (goto-char (point-max)) (comment-enter-backward)

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