From mboxrd@z Thu Jan  1 00:00:00 1970
From: Aaron Ecay <aaronecay@gmail.com>
Subject: Re: Help with fixing an org-mode multicolumn implementation - LaTeX
 special characters
Date: Mon, 22 Feb 2016 15:48:41 +0000
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To: mcg <giepen.m@googlemail.com>, emacs-orgmode@gnu.org

Hi mcg,

2016ko otsailak 21an, mcg-ek idatzi zuen:
>=20
> I found a very nice implementation of LaTeX multicolumn functionality in=
=20
> this thread:
> https://lists.gnu.org/archive/html/emacs-orgmode/2013-02/msg00736.html

[...]

> However, using any of the characters of the left column of my example=20
> table in the merged <2colc> column, I get:
> "setq: Invalid use of `\' in replacement text"

I think the function should be written (untested):

(defun my-latex-multicolumn-filter (row backend info)
  (when (org-export-derived-backend-p backend 'latex)
    (while (string-match "\\(<\\([0-9]+\\)col\\([lrc]\\)?>[[:blank:]]*\\([^=
&]+\\)\\)" row)
      (let ((columns (string-to-number (match-string 2 row)))
            (start (match-end 0))
            (contents (replace-regexp-in-string "[[:blank:]]*$" "" (match-s=
tring 4 row)))
            (algn (or (match-string 3 row) "l")))
        (setq row (replace-match
                   (format "\\multicolumn{%d}{%s}{%s}" columns algn content=
s)
                   nil t row 1))
        (while (and (> columns 1) (string-match "&" row start))
          (setq row (replace-match "" nil nil row))
          (decf columns))))
    row))

The change is setting the third argument (=E2=80=98literal=E2=80=99) to =E2=
=80=98replace-match=E2=80=99
to t, and deleting an extra backslash in the "\\multicolumn..." string.

>=20
>=20
> Questions:
> - How to escape the special characters in the left column properly to be=
=20
> able to use them? (tried everything I could think of)
> or
> - How to modify the code above so that it allows for such characters.
>=20
> - If anyone likes the implementation and is more capable than I am, then=
=20
> the same for multirow would be really nice...

Unfortunately I think that=E2=80=99s more complicated, since it would neces=
sitate
examining/modifying the whole table in one go, rather than operating one
row at a time.

--=20
Aaron Ecay