GNU bug report logs - #59856
29.0.50; [PATCH] Feature suggestion, Newsticker runs ticker only periodically

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alex Bochannek <alex <at> bochannek.com>
Subject: bug#59856: closed (Re: bug#59856: Acknowledgement (29.0.50;
 [PATCH] Feature suggestion, Newsticker runs ticker only periodically))
Date: Mon, 16 Jan 2023 13:50:02 +0000

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Your bug report

#59856: 29.0.50; [PATCH] Feature suggestion, Newsticker runs ticker only periodically

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 59856 <at> debbugs.gnu.org.

-- 
59856: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=59856
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ulf Jasper <ulf.jasper <at> web.de>
Cc: 59856-done <at> debbugs.gnu.org, alex <at> bochannek.com
Subject: Re: bug#59856: Acknowledgement (29.0.50; [PATCH] Feature
 suggestion, Newsticker runs ticker only periodically)
Date: Mon, 16 Jan 2023 15:49:57 +0200

> From: Ulf Jasper <ulf.jasper <at> web.de>
> Cc: Alex Bochannek <alex <at> bochannek.com>,  59856 <at> debbugs.gnu.org
> Date: Mon, 16 Jan 2023 09:22:07 +0100
> 
> Am 13.01.2023 um 08:35 (+0200) schrieb Eli Zaretskii:
> > Ulf, please install this on the master branch.
> 
> Done.

Thanks, I'm therefore closing the bug.

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From: Alex Bochannek <alex <at> bochannek.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; [PATCH] Feature suggestion, Newsticker runs ticker only
 periodically
Date: Tue, 06 Dec 2022 03:14:17 -0800

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Hello!

I started using the Ticker frontend of Newsticker and didn't like that
it continuously scrolls the echo area.

I am submitting the below patch, which only displays the list of items
once, at `newsticker-ticker-period` intervals. The default behavior has
not changed. Not sure if this warrants a change in NEWS.

Thanks!

	Newsticker ticker scrolling options to only display periodically

	* lisp/net/newst-ticker.el (newsticker-ticker-period): 
	Scroll news items only once each period.

	* doc/misc/newsticker.texi (Frontends):
	Document ticker scolling behavior.

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diff --git a/lisp/net/newst-ticker.el b/lisp/net/newst-ticker.el
index ef0fe83803..abd7c3d04b 100644
--- a/lisp/net/newst-ticker.el
+++ b/lisp/net/newst-ticker.el
@@ -44,8 +44,10 @@ newsticker--prev-message
   "Last message that the newsticker displayed.")
 (defvar newsticker--scrollable-text ""
   "The text which is scrolled smoothly in the echo area.")
+(defvar newsticker--ticker-period-timer nil
+  "Timer for newsticker ticker display.")
 (defvar newsticker--ticker-timer nil
-  "Timer for newsticker ticker.")
+  "Timer for newsticker ticker scrolling.")
 
 ;;;###autoload
 (defun newsticker-ticker-running-p ()
@@ -77,7 +79,7 @@ newsticker--set-customvar-ticker
 
 (defcustom newsticker-ticker-interval
   0.3
-  "Time interval for displaying news items in the echo area (seconds).
+  "Time interval for scrolling news items in the echo area (seconds).
 If equal or less than 0 no messages are shown in the echo area.  For
 smooth display (see `newsticker-scroll-smoothly') a value of 0.3 seems
 reasonable.  For non-smooth display a value of 10 is a good starting
@@ -86,6 +88,17 @@ newsticker-ticker-interval
   :set #'newsticker--set-customvar-ticker
   :group 'newsticker-ticker)
 
+(defcustom newsticker-ticker-period
+  0
+  "Time interval for displaying news items in the echo area (seconds).
+If equal or less than 0 messages are shown continuously.  In order not
+to miss new items, a value of equal or less than the shortest feed
+retrieval interval (or the global `newsticker-retrieval-interval`) is
+recommended."
+  :type 'number
+  :set #'newsticker--set-customvar-ticker
+  :group 'newsticker-ticker)
+
 (defcustom newsticker-scroll-smoothly
   t
   "Decides whether to flash or scroll news items.
@@ -129,9 +142,16 @@ newsticker--display-tick
   "Called from the display timer.
 This function calls a display function, according to the variable
 `newsticker-scroll-smoothly'."
-  (if newsticker-scroll-smoothly
-      (newsticker--display-scroll)
-    (newsticker--display-jump)))
+  (when (not newsticker--ticker-timer)
+      (if newsticker-scroll-smoothly
+       (setq newsticker--ticker-timer
+             (run-at-time 1
+                          newsticker-ticker-interval
+                          #'newsticker--display-scroll))
+     (setq newsticker--ticker-timer
+           (run-at-time nil
+                        newsticker-ticker-interval
+                        #'newsticker--display-jump)))))
 
 (defsubst newsticker--echo-area-clean-p ()
   "Check whether somebody is using the echo area / minibuffer.
@@ -149,7 +169,12 @@ newsticker--display-jump
     (when (newsticker--echo-area-clean-p)
       (setq newsticker--item-position (1+ newsticker--item-position))
       (when (>= newsticker--item-position (length newsticker--item-list))
-        (setq newsticker--item-position 0))
+        (setq newsticker--item-position 0)
+        (when (> newsticker-ticker-period 0)
+          (cancel-timer newsticker--ticker-timer)
+          (setq newsticker--ticker-timer nil)
+          (run-at-time newsticker-ticker-interval nil
+                       (lambda () (message "")))))
       (setq newsticker--prev-message
             (nth newsticker--item-position newsticker--item-list))
       (message "%s" newsticker--prev-message))))
@@ -192,7 +217,12 @@ newsticker--display-scroll
         (setq newsticker--prev-message subtext)
         (setq newsticker--item-position (1+ i))
         (when (>= newsticker--item-position l)
-          (setq newsticker--item-position 0))))))
+          (setq newsticker--item-position 0)
+          (when (> newsticker-ticker-period 0)
+            (cancel-timer newsticker--ticker-timer)
+            (setq newsticker--ticker-timer nil)
+            (run-at-time newsticker-ticker-interval nil
+                         (lambda () (message "")))))))))
 
 ;;;###autoload
 (defun newsticker-start-ticker ()
@@ -200,19 +230,26 @@ newsticker-start-ticker
 Start display timer for the actual ticker if wanted and not
 running already."
   (interactive)
-  (if (and (> newsticker-ticker-interval 0)
-           (not newsticker--ticker-timer))
-      (setq newsticker--ticker-timer
-            (run-at-time newsticker-ticker-interval
-                         newsticker-ticker-interval
-                         #'newsticker--display-tick))))
+  (when (and (> newsticker-ticker-interval 0)
+             (not newsticker--ticker-period-timer)
+             (not newsticker--ticker-timer))
+      (if (> newsticker-ticker-period 0)
+          (setq newsticker--ticker-period-timer
+                (run-at-time nil
+                             newsticker-ticker-period
+                             #'newsticker--display-tick))
+        (newsticker--display-tick))))
 
 (defun newsticker-stop-ticker ()
   "Stop newsticker's ticker (but not the news retrieval)."
   (interactive)
-  (when newsticker--ticker-timer
-    (cancel-timer newsticker--ticker-timer)
-    (setq newsticker--ticker-timer nil)))
+  (progn
+    (when newsticker--ticker-timer
+      (cancel-timer newsticker--ticker-timer)
+      (setq newsticker--ticker-timer nil))
+    (when newsticker--ticker-period-timer
+      (cancel-timer newsticker--ticker-period-timer)
+      (setq newsticker--ticker-period-timer nil))))
 
 ;; ======================================================================
 ;;; Manipulation of ticker text
diff --git a/doc/misc/newsticker.texi b/doc/misc/newsticker.texi
index fec571d923..01384b5850 100644
--- a/doc/misc/newsticker.texi
+++ b/doc/misc/newsticker.texi
@@ -307,11 +307,16 @@ Frontends
 
 @findex newsticker-start-ticker
 @findex newsticker-stop-ticker
+@vindex newsticker-ticker-period
 Headlines can be displayed in the echo area, either scrolling like
 messages in a stock-quote ticker, or just changing.  This can be
 started with the command @code{newsticker-start-ticker}.  It can be
 stopped with @code{newsticker-stop-ticker}.
 
+The ticker by default runs continuously.  To only run it once, at a
+specific time interval, set the @code{newsticker-ticker-period}
+variable.
+
 
 @node Navigation
 @section Navigation
@@ -542,8 +547,10 @@ Configuration
 @itemize
 @item
 @vindex newsticker-display-interval
+@vindex newsticker-ticker-period
 @vindex newsticker-scroll-smoothly
-@code{newsticker-ticker-interval} and
+@code{newsticker-ticker-interval},
+@code{newsticker-ticker-period}, and
 @code{newsticker-scroll-smoothly} define how headlines are shown in
 the echo area.
 @end itemize

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-- 
Alex.

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