Re: Listing headings in dedicated buffer with imenu.

[Heime]

On Tuesday, July 30th, 2024 at 1:02 AM, Stephen Berman <stephen.berman@gmx.net> 
wrote:

> [I sent this yesterday but it hasn't shown up in the list, so
> resending.]
> 
> On Mon, 29 Jul 2024 11:53:07 +0000 Heime heimeborgia@protonmail.com wrote:
> 
> > On Monday, July 29th, 2024 at 11:45 PM, Stephen Berman
> > stephen.berman@gmx.net wrote:
> > 
> > > On Mon, 29 Jul 2024 11:29:07 +0000 Heime heimeborgia@protonmail.com wrote:
> > > 
> > > > Sent with Proton Mail secure email.
> > > > 
> > > > On Monday, July 29th, 2024 at 10:51 PM, Stephen Berman
> > > > stephen.berman@gmx.net wrote:
> > > > 
> > > > > On Mon, 29 Jul 2024 10:41:08 +0000 Heime heimeborgia@protonmail.com 
> > > > > wrote:
> > > > > 
> > > > > > Sent with Proton Mail secure email.
> > > > > > 
> > > > > > On Monday, July 29th, 2024 at 10:32 PM, Stephen Berman
> > > > > > stephen.berman@gmx.net wrote:
> > > > > > 
> > > > > > > On Mon, 29 Jul 2024 10:26:22 +0000 Heime 
> > > > > > > heimeborgia@protonmail.com wrote:
> > > > > > > 
> > > > > > > > Sent with Proton Mail secure email.
> > > > > > > > 
> > > > > > > > On Monday, July 29th, 2024 at 9:33 PM, Stephen Berman
> > > > > > > > stephen.berman@gmx.net wrote:
> > > > > > > > 
> > > > > > > > > On Mon, 29 Jul 2024 08:48:38 +0000 Heime
> > > > > > > > > heimeborgia@protonmail.com wrote:
> > > > > > > > > 
> > > > > > > > > > I wish to list headings in a dedicated buffer with imenu.
> > > > > > > > > > The listing should be in the order in which headings occur
> > > > > > > > > > in the buffer.
> > > > > > > > > > 
> > > > > > > > > > Have done the following, but the buffer ends up empty.
> > > > > > > > > > 
> > > > > > > > > > (defun vodil-imenu-bfh ()
> > > > > > > > > > "Insert imenu headings in order in a dedicated buffer."
> > > > > > > > > > (interactive)
> > > > > > > > > > 
> > > > > > > > > > (let ((imenu-items (imenu--make-index-alist t))
> > > > > > > > > > (buffer-name "Imenu Headings"))
> > > > > > > > > > (with-current-buffer (get-buffer-create buffer-name)
> > > > > > > > > > (erase-buffer)
> > > > > > > > > > (dolist (item imenu-items)
> > > > > > > > > > (let ((name (car item))
> > > > > > > > > > (position (cdr item)))
> > > > > > > > > > (when (and (stringp name) (number-or-marker-p position))
> > > > > > > > > > (insert (format "%s\n" name)))))
> > > > > > > > > > (goto-char (point-min)))
> > > > > > > > > > (pop-to-buffer buffer-name)))
> > > > > > > > > 
> > > > > > > > > It works for me, as long as imenu.el is loaded.
> > > > > > > > > 
> > > > > > > > > Steve Berman
> > > > > > > > 
> > > > > > > > What would I need to load it ?
> > > > > > > 
> > > > > > > One way is this:
> > > > > > > 
> > > > > > > (defun vodil-imenu-bfh ()
> > > > > > > "Insert imenu headings in order in a dedicated buffer."
> > > > > > > (interactive)
> > > > > > > (eval-when-compile
> > > > > > > (require 'imenu))
> > > > > > > (let ((imenu-items (imenu--make-index-alist t))
> > > > > > > (buffer-name "Imenu Headings"))
> > > > > > > (with-current-buffer (get-buffer-create buffer-name)
> > > > > > > (erase-buffer)
> > > > > > > (dolist (item imenu-items)
> > > > > > > (let ((name (car item))
> > > > > > > (position (cdr item)))
> > > > > > > (when (and (stringp name) (number-or-marker-p position))
> > > > > > > (insert (format "%s\n" name)))))
> > > > > > > (goto-char (point-min)))
> > > > > > > (pop-to-buffer buffer-name)))
> > > > > > > 
> > > > > > > Steve Berman
> > > > > > 
> > > > > > Right. I have this function that I run. Running vodil-imenu-bfh
> > > > > > after executing vodil-imenu-expr gives me rescan in the buffer.
> > > > > > 
> > > > > > (defun vodil-imenu-expr ()
> > > > > > "Set up `imenu` to show a list of functions in the current buffer."
> > > > > > 
> > > > > > (interactive)
> > > > > > 
> > > > > > (setq imenu-generic-expression
> > > > > > '( ("headings" "^;;;\\s-+\\([HM][[:digit:]]\\)\\s-+\\(.*\\)" 2)))
> > > > > > 
> > > > > > (imenu-add-to-menubar "Iml")
> > > > > > (imenu--make-index-alist t)
> > > > > > (call-interactively 'imenu))
> > > > > 
> > > > > What were the contents of the current buffer when you executed
> > > > > vodil-imenu-expr?
> > > > > 
> > > > > Steve Berman
> > > > 
> > > > I had an elisp file. I ran "M-x vodil-imenu-expr" when in the file to 
> > > > get
> > > > the correct imenu entries. But executing "M-x vodil-imenu-bfh" after 
> > > > that
> > > > I end up with the buffer "Imenu Headings" having only rescan in it.
> > > 
> > > When I test your code on one of the built-in Emacs Lisp libraries,
> > > e.g. avoid.el, then, on invoking vodil-imenu-expr, I get prompted for an
> > > Index item, and typing TAB, the Completions buffer pops up containing
> > > Rescan and nil. I then type C-g and then M-x vodil-imenu-bfh, and the
> > > Imenu Headings buffer pops up containing just Rescan. However, when
> > > I start Emacs -Q, evaluate just my emendation of your vodil-imenu-bfh
> > > command, then visit avoid.el and invoking vodil-imenu-bfh, the
> > > Imenu Headings buffer pops up containing this:
> > > 
> > > Rescan
> > > mouse-avoidance-set-pointer-shape
> > > mouse-avoidance-point-position
> > > mouse-avoidance-set-mouse-position
> > > mouse-avoidance-too-close-p
> > > mouse-avoidance-banish-destination
> > > mouse-avoidance-banish-mouse
> > > mouse-avoidance-delta
> > > mouse-avoidance-nudge-mouse
> > > mouse-avoidance-random-shape
> > > mouse-avoidance-ignore-p
> > > mouse-avoidance-banish
> > > mouse-avoidance-exile
> > > mouse-avoidance-fancy
> > > mouse-avoidance-mode
> > > 
> > > So at least the contents of avoid.el does not contain a match for your
> > > setting of imenu-generic-expression, and presumably the same goes for
> > > the file you tested your code on.
> > > 
> > > Steve Berman
> > 
> > Try with this to pick up (defun
> > 
> > ("defun" "^\\s-*(defun\\s-+\\([[:word:]-]+\\)") 1)
> > 
> > imenu-generic-expression works on my elisp file. Only the new buffer has 
> > rescan
> 
> 
> Ok, now I see the problem: the list produced by imenu--make-index-alist
> contains two elements: ("Rescan" . -99) is the first, and the second
> is a list whose car is "defun" (or for your file presumably "headings")
> and whose cdr is the list of strings from the matching elements
> (defuns/headings) in the file with their positions. What you want to
> loop over is just the latter list. So it should work if you use this in
> vodil-imenu-bfh:
> 
> (let ((imenu-items (cdadr (imenu--make-index-alist t)))
> ...)
> ...)
> 
> Steve Berman

Now things are working as I hoped.