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bug#32536: displayed width of man pages

From: Juri Linkov
Subject: bug#32536: displayed width of man pages
Date: Sun, 02 Sep 2018 01:27:20 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

> While you're there could you please do some idiomatic changes that
> avoid selecting a window in order to calculate its width:
> For example, replace
> (let ((width
>        (if (window-live-p (get-buffer-window (current-buffer) t))
>          (with-selected-window (get-buffer-window (current-buffer) t)
>            (window-width))
>        (window-width)))))
> with something like
> (window-width (get-buffer-window nil t))
> and
> (if (window-live-p (get-buffer-window (current-buffer) t))
>     (with-selected-window (get-buffer-window (current-buffer) t)
>       (frame-width))
>   (frame-width))
> with something like
> (let ((window (get-buffer-window nil t)))
>   (frame-width (and window (window-frame window))))
> Probably you also want to add a version tag for 'Man-width'.

Right, fixed in the next patch where a version tag is added not to
`Man-width', but to the new customizable variable `Man-width-max'.
This is better since like when man-pages are formatted in their
web versions they limit the width using the CSS property `max-width',
so like CSS has both `width' and `max-width', man.el will have
`Man-width' and `Man-width-max'.

Regarding the request for dynamic reformatting, I'm not sure if
man pages should be reformatted on resizing windows (I remember
seeing a window resize hook, but can't find it now).

Such window resize is necessary also for some other modes,
for example, when a visited image is saved to the desktop file,
it has a wrong size after loading the desktop, because the
image size is calculated when the image file is not yet displayed
in a window.  The image size should be recalculated after
displaying the image buffer.

diff --git a/lisp/man.el b/lisp/man.el
index 1a6eda13b7..08a913b119 100644
--- a/lisp/man.el
+++ b/lisp/man.el
@@ -182,6 +182,20 @@ Man-width
                  (integer :tag "Fixed width" :value 65))
   :group 'man)
+(defcustom Man-width-max nil
+  "Maximum number of columns allowed for the width of manual pages.
+It defines the maximum width for the case when `Man-width' is customized
+to a dynamically calculated value depending on the frame/window width.
+If the width calculated for `Man-width' is larger than the maximum width,
+it will be automatically reduced to the width defined by this variable.
+If the calculated width is smaller than the maximum width, the value
+of this variable has no effect.
+When nil, there is no limit on maximum width."
+  :type '(choice (const :tag "No limit" nil)
+                 (integer :tag "Max width" :value 80))
+  :version "27.1"
+  :group 'man)
 (defcustom Man-frame-parameters nil
   "Frame parameter list for creating a new frame for a manual page."
   :type '(repeat (cons :format "%v"
@@ -1041,20 +1055,19 @@ Man-start-calling
              (not (or (getenv "MANWIDTH") (getenv "COLUMNS"))))
       ;; Since the page buffer is displayed beforehand,
       ;; we can select its window and get the window/frame width.
-      (setenv "COLUMNS" (number-to-string
-                        (cond
-                         ((and (integerp Man-width) (> Man-width 0))
-                          Man-width)
-                         (Man-width
-                          (if (window-live-p (get-buffer-window 
(current-buffer) t))
-                              (with-selected-window (get-buffer-window 
(current-buffer) t)
-                                (frame-width))
-                            (frame-width)))
-                         (t
-                          (if (window-live-p (get-buffer-window 
(current-buffer) t))
-                              (with-selected-window (get-buffer-window 
(current-buffer) t)
-                                (window-width))
-                            (window-width)))))))
+      (let ((width (cond
+                    ((and (integerp Man-width) (> Man-width 0))
+                     Man-width)
+                    (Man-width
+                     (let ((window (get-buffer-window nil t)))
+                       (frame-width (and window (window-frame window)))))
+                    (t
+                     (window-width (get-buffer-window nil t))))))
+        (when (and (integerp Man-width-max)
+                   (> Man-width-max 0)
+                   (> width Man-width-max))
+          (setq width (min width Man-width-max)))
+        (setenv "COLUMNS" (number-to-string width))))
     ;; Since man-db 2.4.3-1, man writes plain text with no escape
     ;; sequences when stdout is not a tty.     In 2.5.0, the following
     ;; env-var was added to allow control of this (see Debian Bug#340673).

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