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Re: align a column
From: |
Benjamin Rutt |
Subject: |
Re: align a column |
Date: |
Sat, 11 Jan 2003 14:41:40 -0500 |
User-agent: |
Gnus/5.090008 (Oort Gnus v0.08) Emacs/21.3.50 (sparc-sun-solaris2.8) |
Zimmen Gnauh <yah00204052@yahoo.com> writes:
> Suppose I have the following text
>
> first test
> second line
> third line
> fourth line
> fifth line
> ...
>
> How can I quickly align the second column to the first word (test)?
I found the following function 'align-cols' in a file called align.el
(not the one by John Wiegley included with emacs). It should do most
of what you want.
(defun align-cols (start end max-cols)
"Align text between point and mark as columns.
Columns are separated by whitespace characters.
Prefix arg means align that many columns. (default is all)"
(interactive "r\nP")
(save-excursion
(let ((p start)
pos
end-of-line
word
count
(max-cols (if (numberp max-cols) (max 0 (1- max-cols)) nil))
(pos-list nil)
(ref-list nil))
;; find the positions
(goto-char start)
(while (< p end)
(beginning-of-line)
(setq count 0)
(setq end-of-line (save-excursion (end-of-line) (point)))
(re-search-forward "^\\s-*" end-of-line t)
(setq pos (current-column)) ;start of first word
(if (null (car ref-list))
(setq pos-list (list pos))
(setq pos-list (list (max pos (car ref-list))))
(setq ref-list (cdr ref-list)))
(while (and (if max-cols (< count max-cols) t)
(re-search-forward "\\s-+" end-of-line t))
(setq count (1+ count))
(setq word (- (current-column) pos))
;; length of next word including following whitespaces
(setq pos (current-column))
(if (null (car ref-list))
(setq pos-list (cons word pos-list))
(setq pos-list (cons (max word (car ref-list)) pos-list))
(setq ref-list (cdr ref-list))))
(while ref-list
(setq pos-list (cons (car ref-list) pos-list))
(setq ref-list (cdr ref-list)))
(setq ref-list (nreverse pos-list))
(forward-line)
(setq p (point)))
;; aling the cols starting with last row
(setq pos-list (copy-sequence ref-list))
(setq start
(save-excursion (goto-char start) (beginning-of-line) (point)))
(goto-char end)
(beginning-of-line)
(while (>= p start)
(beginning-of-line)
(setq count 0)
(setq end-of-line (save-excursion (end-of-line) (point)))
(re-search-forward "^\\s-*" end-of-line t)
(goto-char (match-end 0))
(setq pos (nth count pos-list))
(while (< (current-column) pos)
(insert-char ?\040 1))
(setq end-of-line (save-excursion (end-of-line) (point)))
(while (and (if max-cols (< count max-cols) t)
(re-search-forward "\\s-+" end-of-line t))
(setq count (1+ count))
(setq pos (+ pos (nth count pos-list)))
(goto-char (match-end 0))
(while (< (current-column) pos)
(insert-char ?\040 1))
(setq end-of-line (save-excursion (end-of-line) (point))))
(forward-line -1)
(if (= p (point-min)) (setq p (1- p))
(setq p (point)))))))
--
Benjamin
- align a column, Zimmen Gnauh, 2003/01/11
- Re: align a column,
Benjamin Rutt <=