Remove unnecessary casts.

[emacs.git] / lisp / delim-col.el

;;; delim-col.el --- prettify all columns in a region or rectangle

;; Copyright (C) 1999-2011 Free Software Foundation, Inc.

;; Author: Vinicius Jose Latorre <viniciusjl@ig.com.br>
;; Maintainer: Vinicius Jose Latorre <viniciusjl@ig.com.br>
;; Version: 2.1
;; Keywords: internal
;; X-URL: http://www.emacswiki.org/cgi-bin/wiki/ViniciusJoseLatorre

;; This file is part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; delim-col helps to prettify columns in a text region or rectangle.
;;
;; To use it, make sure that this file is in load-path and insert in your
;; .emacs:
;;
;;    (require 'delim-col)
;;
;; If you have, for example, the following columns:
;;
;;      a       b       c       d
;;      aaaa    bb      ccc     ddddd
;;      aaa     bbb     cccc    dddd
;;      aa      bb      ccccccc ddd
;;
;; And the following settings:
;;
;;    (setq delimit-columns-str-before "[ ")
;;    (setq delimit-columns-str-after " ]")
;;    (setq delimit-columns-str-separator ", ")
;;    (setq delimit-columns-before "")
;;    (setq delimit-columns-after "")
;;    (setq delimit-columns-separator "\t")
;;    (setq delimit-columns-format 'separator)
;;    (setq delimit-columns-extra t)
;;
;; If you select the lines above and type:
;;
;;    M-x delimit-columns-region RET
;;
;; You obtain the following result:
;;
;;      [ a   , b  , c      , d     ]
;;      [ aaaa, bb , ccc    , ddddd ]
;;      [ aaa , bbb, cccc   , dddd  ]
;;      [ aa  , bb , ccccccc, ddd   ]
;;
;; But if you select start from the very first b to the very last c and type:
;;
;;    M-x delimit-columns-rectangle RET
;;
;; You obtain the following result:
;;
;;      a       [ b  , c       ]        d
;;      aaaa    [ bb , ccc     ]        ddddd
;;      aaa     [ bbb, cccc    ]        dddd
;;      aa      [ bb , ccccccc ]        ddd
;;
;; Now, if we change settings to:
;;
;;    (setq delimit-columns-before "<")
;;    (setq delimit-columns-after ">")
;;
;; For the `delimit-columns-region' example above, the result is:
;;
;;      [ <a>   , <b>  , <c>      , <d>     ]
;;      [ <aaaa>, <bb> , <ccc>    , <ddddd> ]
;;      [ <aaa> , <bbb>, <cccc>   , <dddd>  ]
;;      [ <aa>  , <bb> , <ccccccc>, <ddd>   ]
;;
;; And for the `delimit-columns-rectangle' example above, the result is:
;;
;;      a       [ <b>  , <c>       ]    d
;;      aaaa    [ <bb> , <ccc>     ]    ddddd
;;      aaa     [ <bbb>, <cccc>    ]    dddd
;;      aa      [ <bb> , <ccccccc> ]    ddd
;;
;; Note that `delimit-columns-region' operates over all text region
;; selected, extending the region start to the beginning of line and the
;; region end to the end of line.  While `delimit-columns-rectangle'
;; operates over the text rectangle selected which rectangle diagonal is
;; given by the region start and end.
;;
;; See `delimit-columns-format' variable documentation for column formating.
;;
;; `delimit-columns-region' is useful when you have columns of text that
;; are not well aligned, like:
;;
;;      horse   apple   bus
;;      dog     pineapple       car
;;      porcupine       strawberry      airplane
;;
;; `delimit-columns-region' and `delimit-columns-rectangle' handle lines
;; with different number of columns, like:
;;
;;      horse   apple   bus
;;      dog     pineapple       car     EXTRA
;;      porcupine       strawberry      airplane
;;
;; Use `delimit-columns-customize' to customize delim-col package variables.

;;; Code:


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User Options:

(defgroup columns nil
  "Prettify columns."
  :link '(emacs-library-link :tag "Source Lisp File" "delim-col.el")
  :prefix "delimit-columns-"
  :group 'wp)

(defcustom delimit-columns-str-before ""
  "Specify a string to be inserted before all columns."
  :type '(string :tag "Before All Columns")
  :group 'columns)

(defcustom delimit-columns-str-separator ", "
  "Specify a string to be inserted between each column."
  :type '(string :tag "Between Each Column")
  :group 'columns)

(defcustom delimit-columns-str-after ""
  "Specify a string to be inserted after all columns."
  :type '(string :tag "After All Columns")
  :group 'columns)

(defcustom delimit-columns-before ""
  "Specify a string to be inserted before each column."
  :type '(string :tag "Before Each Column")
  :group 'columns)

(defcustom delimit-columns-after ""
  "Specify a string to be inserted after each column."
  :type '(string :tag "After Each Column")
  :group 'columns)

(defcustom delimit-columns-separator "\t"
  "Specify a regexp which separates each column."
  :type '(regexp :tag "Column Separator")
  :group 'columns)

(defcustom delimit-columns-format t
  "Specify how to format columns.

For examples below, consider:

   + columns `ccc' and `dddd',
   + the maximum column length for each column is 6,
   + and the following settings:
      (setq delimit-columns-before \"<\")
      (setq delimit-columns-after \">\")
      (setq delimit-columns-separator \":\")

Valid values are:

   nil          no formating.  That is, `delimit-columns-after' is followed by
                `delimit-columns-separator'.
                For example, the result is: \"<ccc>:<dddd>:\"

   t            align columns.  That is, `delimit-columns-after' is followed by
                `delimit-columns-separator' and then followed by spaces.
                For example, the result is: \"<ccc>:   <dddd>:  \"

   'separator   align separators.  That is, `delimit-columns-after' is followed
                by spaces and then followed by `delimit-columns-separator'.
                For example, the result is: \"<ccc>   :<dddd>  :\"

   'padding     format column by filling with spaces before
                `delimit-columns-after'.  That is, spaces are followed by
                `delimit-columns-after' and then followed by
                `delimit-columns-separator'.
                For example, the result is: \"<ccc   >:<dddd  >:\"

Any other value is treated as t."
  :type '(choice :menu-tag "Column Formating"
                 :tag "Column Formating"
                 (const :tag "No Formating" nil)
                 (const :tag "Column Alignment" t)
                 (const :tag "Separator Aligment" separator)
                 (const :tag "Column Padding" padding))
  :group 'columns)

(defcustom delimit-columns-extra t
  "Non-nil means that lines will have the same number of columns.

This has effect only when there are lines with different number of columns."
  :type '(boolean :tag "Lines With Same Number Of Column")
  :group 'columns)

(defcustom delimit-columns-start 0
  "Specify column number to start prettifing.

See also `delimit-columns-end' for documentation.

The following relation must hold:
   0 <= delimit-columns-start <= delimit-columns-end

The column number start from 0 and it's relative to the beginning of selected
region.  So if you selected a text region, the first column (column 0) is
located at beginning of line.  If you selected a text rectangle, the first
column (column 0) is located at left corner."
  :type '(integer :tag "Column Start")
  :group 'columns)

(defcustom delimit-columns-end 1000000
  "Specify column number to end prettifing.

See also `delimit-columns-start' for documentation.

The following relation must hold:
   0 <= delimit-columns-start <= delimit-columns-end

The column number start from 0 and it's relative to the beginning of selected
region.  So if you selected a text region, the first column (column 0) is
located at beginning of line.  If you selected a text rectangle, the first
column (column 0) is located at left corner."
  :type '(integer :tag "Column End")
  :group 'columns)

\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User Commands:


;; to avoid compilation gripes
(defvar delimit-columns-max nil)
(defvar delimit-columns-limit nil)


;;;###autoload
(defun delimit-columns-customize ()
  "Customization of `columns' group."
  (interactive)
  (customize-group 'columns))


(defmacro delimit-columns-str (str)
  `(if (stringp ,str) ,str ""))


;;;###autoload
(defun delimit-columns-region (start end)
  "Prettify all columns in a text region.

START and END delimits the text region."
  (interactive "*r")
  (let ((delimit-columns-str-before
         (delimit-columns-str delimit-columns-str-before))
        (delimit-columns-str-separator
         (delimit-columns-str delimit-columns-str-separator))
        (delimit-columns-str-after
         (delimit-columns-str delimit-columns-str-after))
        (delimit-columns-before
         (delimit-columns-str delimit-columns-before))
        (delimit-columns-after
         (delimit-columns-str delimit-columns-after))
        (delimit-columns-start
         (if (and (integerp delimit-columns-start)
                  (>= delimit-columns-start 0))
             delimit-columns-start
           0))
        (delimit-columns-end
         (if (integerp delimit-columns-end)
             delimit-columns-end
           1000000))
        (delimit-columns-limit (make-marker))
        (the-end (copy-marker end))
        delimit-columns-max)
    (when (<= delimit-columns-start delimit-columns-end)
      (save-excursion
        (goto-char start)
        (beginning-of-line)
        ;; get maximum length for each column
        (and delimit-columns-format
             (save-excursion
               (while (< (point) the-end)
                 (delimit-columns-rectangle-max
                  (prog1
                      (point)
                    (end-of-line)))
                 (forward-char 1))))
        ;; prettify columns
        (while (< (point) the-end)
          (delimit-columns-rectangle-line
           (prog1
               (point)
             (end-of-line)))
          (forward-char 1))
        ;; nullify markers
        (set-marker delimit-columns-limit nil)
        (set-marker the-end nil)))))


(require 'rect)


;;;###autoload
(defun delimit-columns-rectangle (start end)
  "Prettify all columns in a text rectangle.

START and END delimits the corners of text rectangle."
  (interactive "*r")
  (let ((delimit-columns-str-before
         (delimit-columns-str delimit-columns-str-before))
        (delimit-columns-str-separator
         (delimit-columns-str delimit-columns-str-separator))
        (delimit-columns-str-after
         (delimit-columns-str delimit-columns-str-after))
        (delimit-columns-before
         (delimit-columns-str delimit-columns-before))
        (delimit-columns-after
         (delimit-columns-str delimit-columns-after))
        (delimit-columns-start
         (if (and (integerp delimit-columns-start)
                  (>= delimit-columns-start 0))
             delimit-columns-start
           0))
        (delimit-columns-end
         (if (integerp delimit-columns-end)
             delimit-columns-end
           1000000))
        (delimit-columns-limit (make-marker))
        (the-end (copy-marker end))
        delimit-columns-max)
    (when (<= delimit-columns-start delimit-columns-end)
      ;; get maximum length for each column
      (and delimit-columns-format
           (save-excursion
             (operate-on-rectangle 'delimit-columns-rectangle-max
                                   start the-end nil)))
      ;; prettify columns
      (save-excursion
        (operate-on-rectangle 'delimit-columns-rectangle-line
                              start the-end nil))
      ;; nullify markers
      (set-marker delimit-columns-limit nil)
      (set-marker the-end nil))))

\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Internal Variables and Functions:


(defun delimit-columns-rectangle-max (startpos &optional _ignore1 _ignore2)
  (set-marker delimit-columns-limit (point))
  (goto-char startpos)
  (let ((ncol 1)
        origin values)
    ;; get current column length
    (while (progn
             (setq origin (current-column))
             (re-search-forward delimit-columns-separator
                                delimit-columns-limit 'move))
      (save-excursion
        (goto-char (match-beginning 0))
        (setq values (cons (- (current-column) origin)
                           values)))
      (setq ncol (1+ ncol)))
    (setq values (cons (- (current-column) origin)
                       values))
    ;; extend delimit-columns-max, if needed
    (let ((index (length delimit-columns-max)))
      (and (> ncol index)
           (let ((extend (make-vector ncol 0)))
             (while (> index 0)
               (setq index (1- index))
               (aset extend index (aref delimit-columns-max index)))
             (setq delimit-columns-max extend))))
    ;; get maximum column length
    (while values
      (setq ncol (1- ncol))
      (aset delimit-columns-max ncol (max (aref delimit-columns-max ncol)
                                          (car values)))
      (setq values (cdr values)))))


(defun delimit-columns-rectangle-line (startpos &optional _ignore1 _ignore2)
  (let ((len  (length delimit-columns-max))
        (ncol 0)
        origin)
    (set-marker delimit-columns-limit (point))
    (goto-char startpos)
    ;; skip initial columns
    (while (and (< ncol delimit-columns-start)
                (< (point) delimit-columns-limit)
                (re-search-forward delimit-columns-separator
                                   delimit-columns-limit 'move))
      (setq ncol (1+ ncol)))
    ;; insert first formating
    (insert delimit-columns-str-before delimit-columns-before)
    ;; Adjust all columns but last one
    (while (progn
             (setq origin (current-column))
             (and (< (point) delimit-columns-limit)
                  (re-search-forward delimit-columns-separator
                                     delimit-columns-limit 'move)
                  (or (< ncol delimit-columns-end)
                      (progn
                        (goto-char (match-beginning 0))
                        nil))))
      (delete-region (match-beginning 0) (point))
      (delimit-columns-format
       (and delimit-columns-format
            (make-string (- (aref delimit-columns-max ncol)
                            (- (current-column) origin))
                         ?\s)))
      (setq ncol (1+ ncol)))
    ;; Prepare last column spaces
    (let ((spaces (and delimit-columns-format
                       (make-string (- (aref delimit-columns-max ncol)
                                       (- (current-column) origin))
                                    ?\s))))
      ;; Adjust extra columns, if needed
      (and delimit-columns-extra
           (while (and (< (setq ncol (1+ ncol)) len)
                       (<= ncol delimit-columns-end))
             (delimit-columns-format spaces)
             (setq spaces (and delimit-columns-format
                               (make-string (aref delimit-columns-max ncol)
                                            ?\s)))))
      ;; insert last formating
      (cond ((null delimit-columns-format)
             (insert delimit-columns-after delimit-columns-str-after))
            ((eq delimit-columns-format 'padding)
             (insert spaces delimit-columns-after delimit-columns-str-after))
            (t
             (insert delimit-columns-after spaces delimit-columns-str-after))
            ))
    (goto-char (max (point) delimit-columns-limit))))


(defun delimit-columns-format (spaces)
  (cond ((null delimit-columns-format)
         (insert delimit-columns-after
                 delimit-columns-str-separator
                 delimit-columns-before))
        ((eq delimit-columns-format 'separator)
         (insert delimit-columns-after
                 spaces
                 delimit-columns-str-separator
                 delimit-columns-before))
        ((eq delimit-columns-format 'padding)
         (insert spaces
                 delimit-columns-after
                 delimit-columns-str-separator
                 delimit-columns-before))
        (t
         (insert delimit-columns-after
                 delimit-columns-str-separator
                 spaces
                 delimit-columns-before))
        ))

\f
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


(provide 'delim-col)


;;; delim-col.el ends here