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- ;; Commands to sort text in an Emacs buffer.
- ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
-
- ;; 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 1, 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; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- (provide 'sort)
-
- ;; Original version of most of this contributed by Howie Kaye
-
- (defun sort-subr (reverse nextrecfun endrecfun &optional startkeyfun endkeyfun)
- "General text sorting routine to divide buffer into records and sort them.
- Arguments are REVERSE NEXTRECFUN ENDRECFUN &optional STARTKEYFUN ENDKEYFUN.
-
- We consider this portion of the buffer to be divided into disjoint pieces
- called sort records. A portion of each sort record (perhaps all of it)
- is designated as the sort key. The records are rearranged in the buffer
- in order by their sort keys. The records may or may not be contiguous.
-
- Usually the records are rearranged in order of ascending sort key.
- If REVERSE is non-nil, they are rearranged in order of descending sort key.
-
- The next four arguments are functions to be called to move point
- across a sort record. They will be called many times from within sort-subr.
-
- NEXTRECFUN is called with point at the end of the previous record.
- It moves point to the start of the next record.
- The first record is assumed to start at the position of point when sort-subr
- is called.
-
- ENDRECFUN is is called with point within the record.
- It should move point to the end of the record.
-
- STARTKEYFUN may moves from the start of the record to the start of the key.
- It may return either return a non-nil value to be used as the key, or
- else the key will be the substring between the values of point after
- STARTKEYFUN and ENDKEYFUN are called. If STARTKEYFUN is nil, the key
- starts at the beginning of the record.
-
- ENDKEYFUN moves from the start of the sort key to the end of the sort key.
- ENDRECFUN may be nil if STARTKEYFUN returns a value or if it would be the
- same as ENDRECFUN."
- (save-excursion
- (message "Finding sort keys...")
- (let* ((sort-lists (sort-build-lists nextrecfun endrecfun
- startkeyfun endkeyfun))
- (old (reverse sort-lists)))
- (if (null sort-lists)
- ()
- (or reverse (setq sort-lists (nreverse sort-lists)))
- (message "Sorting records...")
- (setq sort-lists
- (if (fboundp 'sortcar)
- (sortcar sort-lists
- (cond ((numberp (car (car sort-lists)))
- '<)
- ((consp (car (car sort-lists)))
- 'buffer-substring-lessp)
- (t
- 'string<)))
- (sort sort-lists
- (cond ((numberp (car (car sort-lists)))
- (function
- (lambda (a b)
- (< (car a) (car b)))))
- ((consp (car (car sort-lists)))
- (function
- (lambda (a b)
- (buffer-substring-lessp (car a) (car b)))))
- (t
- (function
- (lambda (a b)
- (string< (car a) (car b)))))))))
- (if reverse (setq sort-lists (nreverse sort-lists)))
- (message "Reordering buffer...")
- (sort-reorder-buffer sort-lists old)))
- (message "Reordering buffer... Done")))
-
- ;; Parse buffer into records using the arguments as Lisp expressions;
- ;; return a list of records. Each record looks like (KEY STARTPOS ENDPOS)
- ;; where KEY is the sort key (a number or string),
- ;; and STARTPOS and ENDPOS are the bounds of this record in the buffer.
-
- ;; The records appear in the list lastmost first!
-
- (defun sort-build-lists (nextrecfun endrecfun startkeyfun endkeyfun)
- (let ((sort-lists ())
- (start-rec nil)
- done key)
- ;; Loop over sort records.
- ;(goto-char (point-min)) -- it is the caller's responsibility to
- ;arrange this if necessary
- (while (not (eobp))
- (setq start-rec (point)) ;save record start
- (setq done nil)
- ;; Get key value, or move to start of key.
- (setq key (catch 'key
- (or (and startkeyfun (funcall startkeyfun))
- ;; If key was not returned as value,
- ;; move to end of key and get key from the buffer.
- (let ((start (point)))
- (funcall (or endkeyfun
- (prog1 endrecfun (setq done t))))
- (if (fboundp 'buffer-substring-lessp)
- (cons start (point))
- (buffer-substring start (point)))))))
- ;; Move to end of this record (start of next one, or end of buffer).
- (cond ((prog1 done (setq done nil)))
- (endrecfun (funcall endrecfun))
- (nextrecfun (funcall nextrecfun) (setq done t)))
- (if key (setq sort-lists (cons
- ;; consing optimization in case in which key
- ;; is same as record.
- (if (and (consp key)
- (equal (car key) start-rec)
- (equal (cdr key) (point)))
- (cons key key)
- (list key start-rec (point)))
- sort-lists)))
- (and (not done) nextrecfun (funcall nextrecfun)))
- sort-lists))
-
- (defun sort-reorder-buffer (sort-lists old)
- (let ((inhibit-quit t)
- (last (point-min))
- (min (point-min)) (max (point-max)))
- (while sort-lists
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- last
- (nth 1 (car old)))
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- (nth 1 (car sort-lists))
- (nth 2 (car sort-lists)))
- (setq last (nth 2 (car old))
- sort-lists (cdr sort-lists)
- old (cdr old)))
- (goto-char (point-max))
- (insert-buffer-substring (current-buffer)
- last
- max)
- (delete-region min max))) ;get rid of old version
-
- (defun sort-lines (reverse beg end)
- "Sort lines in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse 'forward-line 'end-of-line)))
-
- (defun sort-paragraphs (reverse beg end)
- "Sort paragraphs in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse
- (function (lambda () (skip-chars-forward "\n \t\f")))
- 'forward-paragraph)))
-
- (defun sort-pages (reverse beg end)
- "Sort pages in region alphabetically; argument means descending order.
- Called from a program, there are three arguments:
- REVERSE (non-nil means reverse order), BEG and END (region to sort)."
- (interactive "P\nr")
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (sort-subr reverse
- (function (lambda () (skip-chars-forward "\n")))
- 'forward-page)))
-
- (defvar sort-fields-syntax-table nil)
- (if sort-fields-syntax-table nil
- (let ((table (make-syntax-table))
- (i 0))
- (while (< i 256)
- (modify-syntax-entry i "w" table)
- (setq i (1+ i)))
- (modify-syntax-entry ?\ " " table)
- (modify-syntax-entry ?\t " " table)
- (modify-syntax-entry ?\n " " table)
- (setq sort-fields-syntax-table table)))
-
- (defun sort-numeric-fields (field beg end)
- "Sort lines in region numerically by the ARGth field of each line.
- Fields are separated by whitespace and numbered from 1 up.
- Specified field must contain a number in each line of the region.
- With a negative arg, sorts by the -ARG'th field, in reverse order.
- Called from a program, there are three arguments:
- FIELD, BEG and END. BEG and END specify region to sort."
- (interactive "p\nr")
- (sort-fields-1 field beg end
- (function (lambda ()
- (sort-skip-fields (1- field))
- (string-to-int
- (buffer-substring
- (point)
- (save-excursion
- (skip-chars-forward "-0-9")
- (point))))))
- nil))
-
- (defun sort-fields (field beg end)
- "Sort lines in region lexicographically by the ARGth field of each line.
- Fields are separated by whitespace and numbered from 1 up.
- With a negative arg, sorts by the -ARG'th field, in reverse order.
- Called from a program, there are three arguments:
- FIELD, BEG and END. BEG and END specify region to sort."
- (interactive "p\nr")
- (sort-fields-1 field beg end
- (function (lambda ()
- (sort-skip-fields (1- field))
- nil))
- (function (lambda () (skip-chars-forward "^ \t\n")))))
-
- (defun sort-fields-1 (field beg end startkeyfun endkeyfun)
- (let ((reverse (< field 0))
- (tbl (syntax-table)))
- (setq field (max 1 field (- field)))
- (unwind-protect
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (set-syntax-table sort-fields-syntax-table)
- (sort-subr reverse
- 'forward-line 'end-of-line
- startkeyfun endkeyfun))
- (set-syntax-table tbl))))
-
- (defun sort-skip-fields (n)
- (let ((eol (save-excursion (end-of-line 1) (point))))
- (forward-word n)
- (if (> (point) eol)
- (error "Line has too few fields: %s"
- (buffer-substring (save-excursion
- (beginning-of-line) (point))
- eol)))
- (skip-chars-forward " \t")))
-
-
- (defun sort-regexp-fields (reverse record-regexp key-regexp beg end)
- "Sort the region lexicographically as specifed by RECORD-REGEXP and KEY.
- RECORD-REGEXP specifies the textual units which should be sorted.
- For example, to sort lines RECORD-REGEXP would be \"^.*$\"
- KEY specifies the part of each record (ie each match for RECORD-REGEXP)
- is to be used for sorting.
- If it is \"\\digit\" then the digit'th \"\\(...\\)\" match field from
- RECORD-REGEXP is used.
- If it is \"\\&\" then the whole record is used.
- Otherwise, it is a regular-expression for which to search within the record.
- If a match for KEY is not found within a record then that record is ignored.
-
- With a negative prefix arg sorts in reverse order.
-
- For example: to sort lines in the region by the first word on each line
- starting with the letter \"f\",
- RECORD-REGEXP would be \"^.*$\" and KEY \"\\<f\\w*\\>\""
- (interactive "P\nsRegexp specifying records to sort:
- sRegexp specifying key within record: \nr")
- (cond ((or (equal key-regexp "") (equal key-regexp "\\&"))
- (setq key-regexp 0))
- ((string-match "\\`\\\\[1-9]\\'" key-regexp)
- (setq key-regexp (- (aref key-regexp 1) ?0))))
- (save-restriction
- (narrow-to-region beg end)
- (goto-char (point-min))
- (let (sort-regexp-record-end) ;isn't dynamic scoping wonderful?
- (re-search-forward record-regexp)
- (setq sort-regexp-record-end (point))
- (goto-char (match-beginning 0))
- (sort-subr reverse
- (function (lambda ()
- (and (re-search-forward record-regexp nil 'move)
- (setq sort-regexp-record-end (match-end 0))
- (goto-char (match-beginning 0)))))
- (function (lambda ()
- (goto-char sort-regexp-record-end)))
- (function (lambda ()
- (let ((n 0))
- (cond ((numberp key-regexp)
- (setq n key-regexp))
- ((re-search-forward
- key-regexp sort-regexp-record-end t)
- (setq n 0))
- (t (throw 'key nil)))
- (condition-case ()
- (if (fboundp 'buffer-substring-lessp)
- (cons (match-beginning n)
- (match-end n))
- (buffer-substring (match-beginning n)
- (match-end n)))
- ;; if there was no such register
- (error (throw 'key nil))))))))))
-
-
- (defun sort-columns (reverse &optional beg end)
- "Sort lines in region alphabetically by a certain range of columns.
- For the purpose of this command, the region includes
- the entire line that point is in and the entire line the mark is in.
- The column positions of point and mark bound the range of columns to sort on.
- A prefix argument means sort into reverse order.
-
- Note that sort-columns uses the sort utility program and therefore
- cannot work on text containing TAB characters. Use M-x untabify
- to convert tabs to spaces before sorting."
- (interactive "P\nr")
- (save-excursion
- (let (beg1 end1 col-beg1 col-end1 col-start col-end)
- (goto-char (min beg end))
- (setq col-beg1 (current-column))
- (beginning-of-line)
- (setq beg1 (point))
- (goto-char (max beg end))
- (setq col-end1 (current-column))
- (forward-line)
- (setq end1 (point))
- (setq col-start (min col-beg1 col-end1))
- (setq col-end (max col-beg1 col-end1))
- (if (search-backward "\t" beg1 t)
- (error "sort-columns does not work with tabs. Use M-x untabify."))
- (call-process-region beg1 end1 "sort" t t nil
- (if reverse "-rt\n" "-t\n")
- (concat "+0." col-start)
- (concat "-0." col-end)))))
-