Re: Updating CONSTANTS in LaTeX mode

[Seweryn <sewkokot@gmail.com>]

Carsten Dominik <carsten.dominik <at> gmail.com> writes:

> 
> 
> On Dec 11, 2010, at 6:03 PM, Carsten Dominik wrote:
> 
> >
> > On Dec 11, 2010, at 4:05 PM, Seweryn wrote:
> >
> >> Hello,
> >>
> >> Is it possible to have locally defined CONSTANTS in .tex buffer?  
> >> What is the
> >> command to update the list of known CONSTANTS since $pi works but I  
> >> cannot
> >> insert $x to the list of CONSTANTS. See example below
> >>
> >> \begin{comment}
> >> #+CONSTANTS: x=458.0
> >> #+ORGTBL: SEND test1 orgtbl-to-latex :splice t :lend ""
> >> | 3.1415927 | #ERROR |
> >> #+TBLFM: @1$1=$pi::@1$2=$x
> >> % $
> >> \end{comment}
> >>
> >> I would appreciate a hint.
> >
> > This works for me.  Put you must do `C-c C-c' in the CONSTANTS line
> > to make changes known to Org-mode.  Or kill the buffer and revisit  
> > the file,
> > that will also make CONSTANTS known.
> >
> 
> I am sorry, I did not read this carefully.  No, this is currently
> not possible in tex and other non-org-mode files.
> 

For sure, there is a better way to implement it, but for now I modified orgtbl-
ctrl-c-ctrl-c function to update org-table-formula-constants-local. This 
variable is updated when hitting C-c C-c when being on #+TBLFM line.

(defun orgtbl-ctrl-c-ctrl-c (arg)
  "If the cursor is inside a table, realign the table.
If it is a table to be sent away to a receiver, do it.
With prefix arg, also recompute table."
  (interactive "P")
  (let ((pos (point)) action consts-str consts cst)
    (save-excursion
      (beginning-of-line 1)
      (setq action (cond ((looking-at "[ \t]*#\\+ORGTBL:.*\n[ \t]*|") (match-
end 0))
			 ((looking-at "[ \t]*|") pos)
			 ((looking-at "[ \t]*#\\+TBLFM:") 'recalc))))
    (cond
     ((integerp action)
      (goto-char action)
      (org-table-maybe-eval-formula)
      (if arg
	  (call-interactively 'org-table-recalculate)
	(org-table-maybe-recalculate-line))
      (call-interactively 'org-table-align)
      (when (orgtbl-send-table 'maybe)
	(run-hooks 'orgtbl-after-send-table-hook)))
     ((eq action 'recalc)
	  (save-excursion
	(goto-char (point-min))
	(while (re-search-forward "#\\+CONSTANTS: \\(.*\\)" nil t)
	  (setq const-str (substring-no-properties (match-string 1)))
	  (setq consts (append consts (org-split-string const-str "[ \t]+")))
	  (when consts
		(let (e)
		  (while (setq e (pop consts))
		(if (string-match "^\\([a-zA-Z0][_a-zA-Z0-9]*\\)=\\(.*\\)" e)
	(push (cons (match-string 1 e) (match-string 2 e)) cst)))
			  (setq org-table-formula-constants-local cst)))))
      (save-excursion
	(beginning-of-line 1)
	(skip-chars-backward " \r\n\t")
	(if (org-at-table-p)
	    (org-call-with-arg 'org-table-recalculate t))))
     (t (let (orgtbl-mode)
	  (call-interactively (key-binding "\C-c\C-c")))))))
 
Cheers,
Seweryn