Hi all,
please consider the following 2 examples and how the column separator is
filled, both do not work as expected:
--8<---------------cut here---------------start------------->8---
\documentclass{article}
\begin{document}
\begin{tabular}{ll}
\multicolumn{2}{c}{These lines will} `M-RET here'
\end{tabular}
results in:
\begin{tabular}{ll}
\multicolumn{2}{c}{These lines will} `M-RET here' \\
&
\end{tabular}
And
\begin{tabular}{ll}
\multicolumn{2}{c}{These lines will} \\
& `C-c C-q C-e here'
\end{tabular}
results in:
\begin{tabular}{ll}
\multicolumn{2}{c}{These lines will} \\
& `C-c C-q C-e here'
\end{tabular}
\end{document}
--8<---------------cut here---------------end--------------->8---
The issue is in `LaTeX-hanging-ampersand-position' where
(- (current-column) 1) returns a negative value if no "[^\\]&" is found:
--8<---------------cut here---------------start------------->8---
(defun LaTeX-hanging-ampersand-position ()
"Return indent column for a hanging ampersand (i.e. ^\\s-*&)."
(destructuring-bind (beg-pos . beg-col)
(LaTeX-env-beginning-pos-col)
(let* ((cur-pos (point)))
(save-excursion
(if (re-search-backward "\\\\\\\\" beg-pos t)
(let ((cur-idx (TeX-how-many "[^\\]&" (point) cur-pos)))
(goto-char beg-pos)
(re-search-forward "[^\\]&" cur-pos t (+ 1 cur-idx))
(- (current-column) 1))
(+ 2 beg-col))))))
--8<---------------cut here---------------end--------------->8---
My suggest to guard (- (current-column) 1) with a (wholenump ...) and
return (+ 2 beg-col) as fallback if the test is not true:
--8<---------------cut here---------------start------------->8---
(defun LaTeX-hanging-ampersand-position ()
"Return indent column for a hanging ampersand (i.e. ^\\s-*&)."
(destructuring-bind (beg-pos . beg-col)
(LaTeX-env-beginning-pos-col)
(let* ((cur-pos (point)))
(save-excursion
(if (re-search-backward "\\\\\\\\" beg-pos t)
(let ((cur-idx (TeX-how-many "[^\\]&" (point) cur-pos)))
(goto-char beg-pos)
(re-search-forward "[^\\]&" cur-pos t (+ 1 cur-idx))
(if (wholenump (- (current-column) 1))
(- (current-column) 1)
(+ 2 beg-col)))
(+ 2 beg-col))))))
--8<---------------cut here---------------end--------------->8---
Any comments welcome.
Best, Arash
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