Re: need option so line-move-to-column ignores fields, plus patch

["Ken Manheimer" <ken.manheimer@gmail.com>]

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On 9/24/06, Ken Manheimer <ken.manheimer@gmail.com> wrote:

> i see different behavior when i use an arbitrarily named field in my
> example.  it's closer to what i need, as long as i don't put the
> cursor near the border between the fields or in the structure side,
> but there are still some problematic behaviors.  i'm attaching a new
> version of the script which describes exactly what's going on.

i'm still having some problems with the behavior.  when moving
downwards, the cursor jumps to column 1 for one line when it would
wind up shifting to a new field.  it then resumes column-sticky
behavior from the column on which it started, until the next field
change.

the same thing happens when moving upwards, except to the end-of-line
instead of column 1, iff the content side has a field qualifier.  the
example i'm posting can be used to show both situations, by leaving or
removing the comment chars eliding a few of the lines.

i would like to see the behavior richard describes, but would be ok
with plain column-sticky behavior.

i'm sorry i've taken a while to post this, and i'm going to be away
for several days starting tomorrow, so wanted to put this out there.

-- 
ken
ken.manheimer@gmail.com
http://myriadicity.net

[-- Attachment #2: linefield-example.el --]
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;; Eval or load this script and execute the `linefield-example' command
;; for demonstration of the field boundary misbehaviors in an emacs 22 cvs
;; checkout as of mid-day (EST), October 9, 2006.

;; ken
;; ken.manheimer@gmail.com
;; http://myriadicity.net

(defvar linefield-text
  "The lines with a '|' bar as their first non-whitespace
character are decorated with 'field 'boundary and 'face
'highlight text properties from the left margin until and
including the bar.

 | I've lost track of what the correct behavior is supposed to be.
  | When the cursor first changes fields while moving downwards,
   | it jumps to the first column.
    | It moves back to its original column for subsequent moves.
   | If the content side has its own field setting
   | (see the commented out code), then the cursor shifts
  |  to the last column when moviing upwards
 | and hitting a field shift.

The jumps to the first or last column seem undesirable to me."

  "Text for demonstrating linefield staircase.")

(defun linefield-example ()
  "Demonstrate fieldtext boundary misbehavior."
  (interactive)
  (let* ((buffer (get-buffer-create "linefield-example"))
         first second
         (inhibit-field-text-motion t))
    (pop-to-buffer buffer)
    (erase-buffer)
    (insert linefield-text)
    (goto-char (point-min))
    (while (re-search-forward "^ +|" nil t)
      (cond ((not first) (setq first (point)))
            ((not second) (setq second (point))))
      (set-text-properties (match-beginning 0) (point)
                           '(field structure face highlight))
;;      (set-text-properties (point) (progn (end-of-line) (point))
;;                           '(field content face bold))
      )
    (goto-char second)))

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