Juri Linkov <juri@HIDDEN>
to control <at> debbugs.gnu.org.
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bug-gnu-emacs@HIDDEN:bug#79810; Package emacs.
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From: =?utf-8?Q?Elijah_Gabe_P=C3=A9rez?= <eg642616@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#79810: hideshow: Indicators missing for same-line multi-blocks
In-Reply-To: <87tsz1k9z7.fsf@HIDDEN>
References: <87tsz1k9z7.fsf@HIDDEN>
Date: Mon, 10 Nov 2025 16:06:01 -0600
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--=-=-=
Content-Type: text/plain
Juri Linkov <juri@HIDDEN> writes:
> We have a problem in hideshow when a line contains more than 1 block.
>
> For example in c-ts-mode:
>
> #include <stdio.h>
> int main(int argc, char* argv[]) {
> for (int i = 0; i < argc; i++) {
> printf("%s\n", argv[i]);
> }
> return 0;
> }
>
> There is no hideshow indicator for the second line
> because the argument list is not hideable, so the
> the opening bracket for the function body is ignored
> on the same line.
>
> When the curly bracket on the next line,
> then the indicator is shown:
>
> int main(int argc, char* argv[])
> {
> for (int i = 0; i < argc; i++) {
>
> The same problem exists for go-ts-mode
> and other modes with similar syntax.
I found the bug, this patch should fix it:
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
filename=0001-hideshow-Fix-indicators-for-multiple-block-in-the-sa.patch
From e1874d86783f5a15b19a525c61aaa0f6f1740ed4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?El=C3=ADas=20Gabriel=20P=C3=A9rez?= <eg642616@HIDDEN>
Date: Mon, 10 Nov 2025 15:46:19 -0600
Subject: [PATCH] hideshow: Fix indicators for multiple block in the same line
bug#79810
* lisp/progmodes/hideshow.el (hs-hideable-region-p): Simplify.
(hs-block-positions): Change return value.
(hs--add-indicators): Go to the next line only if we have
successfully created the overlays.
(hs-hide-block-at-point, hs-hide-block): Update code.
---
lisp/progmodes/hideshow.el | 58 ++++++++++++++++++++++----------------
1 file changed, 34 insertions(+), 24 deletions(-)
diff --git a/lisp/progmodes/hideshow.el b/lisp/progmodes/hideshow.el
index af5d7a5b19e..06bc0c6e36d 100644
--- a/lisp/progmodes/hideshow.el
+++ b/lisp/progmodes/hideshow.el
@@ -678,11 +678,16 @@ hs-discard-overlays
(delete-overlay ov))))
(hs--refresh-indicators from to))
-(defun hs-hideable-region-p (beg end)
- "Return t if region in BEG and END can be hidden."
+(defun hs-hideable-region-p (&optional beg end)
+ "Return t if region in BEG and END can be hidden.
+If BEG and END are not specified, it will try to check at the current
+block at point."
;; Check if BEG and END are not in the same line number,
;; since using `count-lines' is slow.
- (< beg (save-excursion (goto-char end) (line-beginning-position))))
+ (if (and beg end)
+ (< beg (save-excursion (goto-char end) (line-beginning-position)))
+ (when-let* ((block (hs-block-positions)))
+ (apply #'hs-hideable-region-p block))))
(defun hs-make-overlay (b e kind &optional b-offset e-offset)
"Return a new overlay in region defined by B and E with type KIND.
@@ -724,7 +729,7 @@ hs-make-overlay
(defun hs-block-positions ()
"Return the current code block positions.
-This returns a cons-cell with the current code block beginning and end
+This returns a list with the current code block beginning and end
positions. This does nothing if there is not a code block at current
point."
(save-match-data
@@ -754,7 +759,7 @@ hs-block-positions
(setq block-end
(or (funcall hs-adjust-block-end-function block-beg)
block-end)))
- (cons block-beg block-end))))))
+ (list block-beg block-end))))))
(defun hs--make-indicators-overlays (beg)
"Helper function to make the indicators overlays."
@@ -824,9 +829,9 @@ hs--add-indicators
(point))))
;; Check if block is longer than 1 line.
(_ (hs-hideable-region-p b-beg b-end)))
- (hs--make-indicators-overlays b-beg))
- ;; Only 1 indicator per line
- (forward-line 1))
+ ;; Only 1 indicator per line
+ (when (hs--make-indicators-overlays b-beg)
+ (forward-line))))
`(jit-lock-bounds ,beg . ,end))
(defun hs--refresh-indicators (from to)
@@ -947,8 +952,8 @@ hs-hide-block-at-point
(if comment-reg
(hs-hide-comment-region (car comment-reg) (cadr comment-reg) end)
(when-let* ((block (hs-block-positions)))
- (let ((p (car-safe block))
- (q (cdr-safe block))
+ (let ((p (car block))
+ (q (cadr block))
ov)
(if (hs-hideable-region-p p q)
(progn
@@ -1229,7 +1234,8 @@ hs-hide-block
`hs-hide-hook' is run. See documentation for `run-hooks'."
(interactive "P")
(hs-life-goes-on
- (let ((c-reg (funcall hs-inside-comment-predicate)))
+ (let ((c-reg (funcall hs-inside-comment-predicate))
+ (pos (point)))
(cond
((and c-reg (or (null (nth 0 c-reg))
(not (hs-hideable-region-p (car c-reg) (nth 1 c-reg)))))
@@ -1238,20 +1244,24 @@ hs-hide-block
(c-reg (hs-hide-block-at-point end c-reg))
((or (and (eq hs-hide-block-behavior 'after-bol)
- (save-excursion
- (goto-char (line-beginning-position))
- (funcall hs-find-next-block-function hs-block-start-regexp
- (line-end-position) nil))
+ (setq pos (point))
+ (goto-char (line-beginning-position))
+ (catch 'hs--exit-hide
+ (while (and (funcall hs-find-next-block-function
+ hs-block-start-regexp
+ (line-end-position) nil)
+ (save-excursion
+ (goto-char (match-beginning 0))
+ (if (hs-hideable-region-p)
+ (throw 'hs--exit-hide t)
+ t)))))
(goto-char (match-beginning 0)))
- (funcall hs-looking-at-block-start-predicate))
- ;; If hiding the block fails (due the block is not hideable)
- ;; then just hide the parent block (if possible)
- (unless (save-excursion (hs-hide-block-at-point end))
- (goto-char (1- (point)))
- (funcall hs-find-block-beginning-function)
- (hs-hide-block-at-point end)))
-
- ((funcall hs-find-block-beginning-function)
+ (and (goto-char pos)
+ (funcall hs-looking-at-block-start-predicate)))
+ (hs-hide-block-at-point end))
+
+ ((and (goto-char (line-beginning-position))
+ (funcall hs-find-block-beginning-function))
(hs-hide-block-at-point end)))
(run-hooks 'hs-hide-hook))))
--
2.51.1
--=-=-=
Content-Type: text/plain
--
- E.G via Gnus and Org.
--=-=-=--
bug-gnu-emacs@HIDDEN:bug#79810; Package emacs.
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From: Juri Linkov <juri@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: hideshow: Indicators missing for same-line multi-blocks
Organization: LINKOV.NET
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We have a problem in hideshow when a line contains more than 1 block.
For example in c-ts-mode:
#include <stdio.h>
int main(int argc, char* argv[]) {
for (int i = 0; i < argc; i++) {
printf("%s\n", argv[i]);
}
return 0;
}
There is no hideshow indicator for the second line
because the argument list is not hideable, so the
the opening bracket for the function body is ignored
on the same line.
When the curly bracket on the next line,
then the indicator is shown:
int main(int argc, char* argv[])
{
for (int i = 0; i < argc; i++) {
The same problem exists for go-ts-mode
and other modes with similar syntax.
Juri Linkov <juri@HIDDEN>:eg642616@HIDDEN, bug-gnu-emacs@HIDDEN.
Full text available.eg642616@HIDDEN, bug-gnu-emacs@HIDDEN:bug#79810; Package emacs.
Full text available.
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Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.