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Re: [O] Outline cycling does not preserve point's position

From: Nicolas Goaziou
Subject: Re: [O] Outline cycling does not preserve point's position
Date: Wed, 11 Sep 2013 13:09:48 +0200


Jambunathan K <address@hidden> writes:

> Some suggestions:
> 1. Give a better name.  Say "pre-order" traversal of element in the
>    parse tree. [1]

I don't know what "pre-order" means. What about
`org-flat-forward-element' or simply (but misleading) `org-forward-paragraph'?

> 3. When you say "Shouldn't be here", it means that point is NOT at the
>    canonical C-down position.  But you do seem to "adjust" it to the
>    canonical position down below.
>    May be you want to remove it or say something more positive like - In
>    the middle of nowhere.  Trying to get to the assembly point.

I don't understand. Are you talking about the error message? There is no
"canonical" C-down position, so I'm a bit confused.

>> New version:
> Couple of issues.
> 1. Visit the attached file.  Make sure everything is visible.
> 2. M-<
> 3. C-down gives a stacktrace.  See below.


> 1. Move to bol of the empty line that is in <<<Radioed Target>>> section.  
> That
>    is not an empty line but has spaces.
> 2. C-down
> 3. Cursor does NOT do a stop over at "References" headline but skips
>    past to References to Fuzzy Target

That was a bug in `org-element-at-point', which is now fixed. Thank you.
You'll need to update Org.

New version, with comments and docstring:

(defun org-forward-linear-element ()
  "Move forward to next element, ignoring depth.
The function implements some special moves for convenience:
  - On an affiliated keyword, jump to the beginning of the
    relative element.
  - On an item or a footnote definition, move to the second
    element inside, if any.
  - On a table, jump after it.
  - On a verse block, stop after each blank line."
  (when (eobp) (user-error "Cannot move further down"))
  (let* ((origin (point))
         (element (org-element-at-point))
         (type (org-element-type element))
         (post-affiliated (org-element-property :post-affiliated element))
         (contents-begin (org-element-property :contents-begin element))
         (contents-end (org-element-property :contents-end element))
         (end (let ((end (org-element-property :end element)) (parent element))
                (while (and (setq parent (org-element-property :parent parent))
                            (= (org-element-property :contents-end parent) end))
                  (setq end (org-element-property :end parent)))
    (skip-chars-forward " \r\t\n")
    (or (eobp) (goto-char (max (line-beginning-position) origin)))
    (cond ((or (eobp) (not end) (= (point) end)))
          ;; On affiliated keywords, move to element's beginning.
          ((and post-affiliated (< (point) post-affiliated))
           (goto-char post-affiliated))
          ;; At a table row, move to the end of the table.
          ((eq type 'table-row)
           (goto-char (org-element-property
                       :end (org-element-property :parent element))))
          ((eq type 'table) (goto-char end))
          ((not contents-begin) (goto-char end))
          ;; If current element contents are invisible, skip the
          ;; element.
          ((outline-invisible-p (line-end-position))
           (if (not (eq type 'plain-list)) (goto-char end)
             ;; At a plain list, make sure we move to the next item
             ;; instead of skipping the whole list.
          ((< (point) contents-begin)
           (if (not (memq type '(footnote-definition item)))
               (goto-char contents-begin)
             ;; At footnote definitions and items, move to second
             ;; element, if any, or to next element otherwise.
          ((>= (point) contents-end) (goto-char end))
          ((eq type 'paragraph) (goto-char end))
          ((eq type 'plain-list)
          ;; Verse blocks cannot contain paragraphs.  Though, we
          ;; emulate them with blank lines separators to ease
          ;; editing.
          ((eq type 'verse-block)
           (or (re-search-forward "^[ \t]*$" contents-end t)
               (goto-char end)))
          (t (error "This shouldn't happen")))))


Nicolas Goaziou

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