The current AUCTeX behaviour for primitive tex code involving if-like statements is to indent the conditional statement at the same level as the surrounding condition. I.e. code such as
\if@sometoggle%
\dosomething%
\else%
\doanotherthing%
\fi%
appears as a big block of text. I would like to make AUCTeX indent the snippet as follows:
\if@sometoggle%
\dosomething%
\else%
\doanotherthing%
\fi%
Is this possible?
It's possible:
(setq LaTeX-begin-regexp "\\(?:begin\\|if@\\)\\b")
(setq LaTeX-end-regexp "\\(?:end\\|else\\|fi\\)\\b")
(defun LaTeX-indent-level-count ()
"Count indentation change caused by all \\left, \\right, \\begin, and
\\end commands in the current line."
(save-excursion
(save-restriction
(let ((count 0))
(narrow-to-region (point)
(save-excursion
(re-search-forward
(concat "[^" TeX-esc "]"
"\\(" LaTeX-indent-comment-start-regexp
"\\)\\|\n\\|\\'"))
(backward-char)
(point)))
(while (search-forward TeX-esc nil t)
(cond
((looking-at "left\\b")
(setq count (+ count LaTeX-left-right-indent-level)))
((looking-at "right\\b")
(setq count (- count LaTeX-left-right-indent-level)))
((looking-at LaTeX-begin-regexp)
(setq count (+ count LaTeX-indent-level)))
((looking-at "else\\b"))
((looking-at LaTeX-end-regexp)
(setq count (- count LaTeX-indent-level)))
((looking-at (regexp-quote TeX-esc))
(forward-char 1))))
count))))
Note that I had to re-define LaTeX-indent-level-count.
The diff is simply one cond branch:
((looking-at "else\\b"))
\else. The position of the \else is correct, but the following code (\doanotherthin, see question) is still in the first column, instead of column 3. I changed your first code line, to incorporate also the \ifx-command and thought, adding the else command would help, but I failed (at least with again indenting after \else). So here is my partially working code: (setq LaTeX-begin-regexp "\\(?:begin\\|if\\|ifx\\|else\\)\\b") Any ideas?