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Re: Aligning colums


From: Peter Heslin
Subject: Re: Aligning colums
Date: Mon, 24 Jan 2005 17:57:39 -0600
User-agent: slrn/0.9.8.0 (Linux)

On 2005-01-20, Roy Smith <address@hidden> wrote:
>  I want to get the arguments lined up so it looks like:
> 
>        foo ("arg1", "xxxxxxxxxxxxxx",  1, "xxxx",       2)
>        foo ("arg1", "xxxxxxxxx",       1, "xxx",        2)
>        foo ("arg1", "xxxxxxxxxxx",     1, "xxxxxxxx",   2)
>        foo ("arg1", "xxxxxxxx",        1, "xxxxxx",     2)
>        foo ("arg1", "xxxxxxxxxx",      1, "xxxxxxx",    2)
> 
>  What's the best way to do that?  I suspect M-X align is what I want, I
>  can't make heads or tails out of the on-line help.

I think that this package will work for you out of the box.  I can't
remember where I found it.

;;; align-cols.el --- aling text seperated by whitespaces in columns

;; Copyright (C) 1999 by Matthias Helmling

;; Author: Matthias Helmling <address@hidden>
;; Keywords: extensions
;; Version: 0.2
;; Time-stamp: "99/01/30 15:46:16 matt"

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; tested with XEmacs 20.4 and GNU Emacs 20.2.1

;;; Code:
(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))))
      )))

(provide 'align-cols)



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