mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-22 07:09:54 +00:00
564 lines
20 KiB
EmacsLisp
564 lines
20 KiB
EmacsLisp
;;; sort.el --- commands to sort text in an Emacs buffer
|
||
|
||
;; Copyright (C) 1986, 1987, 1994, 1995, 2001, 2002, 2003,
|
||
;; 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
|
||
|
||
;; Author: Howie Kaye
|
||
;; Maintainer: FSF
|
||
;; Keywords: unix
|
||
|
||
;; 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:
|
||
|
||
;; This package provides the sorting facilities documented in the Emacs
|
||
;; user's manual.
|
||
|
||
;;; Code:
|
||
|
||
(defgroup sort nil
|
||
"Commands to sort text in an Emacs buffer."
|
||
:group 'data)
|
||
|
||
(defcustom sort-fold-case nil
|
||
"Non-nil if the buffer sort functions should ignore case."
|
||
:group 'sort
|
||
:type 'boolean)
|
||
;;;###autoload(put 'sort-fold-case 'safe-local-variable 'booleanp)
|
||
|
||
;;;###autoload
|
||
(defun sort-subr (reverse nextrecfun endrecfun
|
||
&optional startkeyfun endkeyfun predicate)
|
||
"General text sorting routine to divide buffer into records and sort them.
|
||
|
||
We divide the accessible portion of the buffer 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 variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order.
|
||
|
||
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.
|
||
It should move point to the end of the buffer if there are no more records.
|
||
The first record is assumed to start at the position of point when sort-subr
|
||
is called.
|
||
|
||
ENDRECFUN is called with point within the record.
|
||
It should move point to the end of the record.
|
||
|
||
STARTKEYFUN moves from the start of the record to the start of the key.
|
||
It may return either a non-nil value to be used as the key, or
|
||
else the key is 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.
|
||
ENDKEYFUN may be nil if STARTKEYFUN returns a value or if it would be the
|
||
same as ENDRECFUN.
|
||
|
||
PREDICATE is the function to use to compare keys. If keys are numbers,
|
||
it defaults to `<', otherwise it defaults to `string<'."
|
||
;; Heuristically try to avoid messages if sorting a small amt of text.
|
||
(let ((messages (> (- (point-max) (point-min)) 50000)))
|
||
(save-excursion
|
||
(if messages (message "Finding sort keys..."))
|
||
(let* ((sort-lists (sort-build-lists nextrecfun endrecfun
|
||
startkeyfun endkeyfun))
|
||
(old (reverse sort-lists))
|
||
(case-fold-search sort-fold-case))
|
||
(if (null sort-lists)
|
||
()
|
||
(or reverse (setq sort-lists (nreverse sort-lists)))
|
||
(if messages (message "Sorting records..."))
|
||
(setq sort-lists
|
||
(sort sort-lists
|
||
(cond (predicate
|
||
`(lambda (a b) (,predicate (car a) (car b))))
|
||
((numberp (car (car sort-lists)))
|
||
'car-less-than-car)
|
||
((consp (car (car sort-lists)))
|
||
(lambda (a b)
|
||
(> 0 (compare-buffer-substrings
|
||
nil (car (car a)) (cdr (car a))
|
||
nil (car (car b)) (cdr (car b))))))
|
||
(t
|
||
(lambda (a b) (string< (car a) (car b)))))))
|
||
(if reverse (setq sort-lists (nreverse sort-lists)))
|
||
(if messages (message "Reordering buffer..."))
|
||
(sort-reorder-buffer sort-lists old)))
|
||
(if messages (message "Reordering buffer... Done"))))
|
||
nil)
|
||
|
||
;; 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))))
|
||
(cons 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 (push
|
||
;; 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)
|
||
(cons key (cons start-rec (point))))
|
||
sort-lists))
|
||
(and (not done) nextrecfun (funcall nextrecfun)))
|
||
sort-lists))
|
||
|
||
(defun sort-reorder-buffer (sort-lists old)
|
||
(let ((last (point-min))
|
||
(min (point-min)) (max (point-max))
|
||
(old-buffer (current-buffer))
|
||
(mb enable-multibyte-characters)
|
||
temp-buffer)
|
||
(with-temp-buffer
|
||
(set-buffer-multibyte mb)
|
||
;; Record the temporary buffer.
|
||
(setq temp-buffer (current-buffer))
|
||
|
||
;; Copy the sorted text into the temporary buffer.
|
||
(while sort-lists
|
||
(goto-char (point-max))
|
||
(insert-buffer-substring old-buffer
|
||
last
|
||
(nth 1 (car old)))
|
||
(goto-char (point-max))
|
||
(insert-buffer-substring old-buffer
|
||
(nth 1 (car sort-lists))
|
||
(cdr (cdr (car sort-lists))))
|
||
(setq last (cdr (cdr (car old)))
|
||
sort-lists (cdr sort-lists)
|
||
old (cdr old)))
|
||
(goto-char (point-max))
|
||
(insert-buffer-substring old-buffer last max)
|
||
|
||
;; Copy the reordered text from the temporary buffer
|
||
;; to the buffer we sorted (OLD-BUFFER).
|
||
(set-buffer old-buffer)
|
||
(let ((inhibit-quit t))
|
||
;; Make sure insertions done for reordering
|
||
;; saves any markers at the end of the sorted region,
|
||
;; by leaving the last character of the region.
|
||
(delete-region min (1- max))
|
||
;; Now replace the one remaining old character with the sorted text.
|
||
(goto-char (point-min))
|
||
(insert-buffer-substring temp-buffer)
|
||
(delete-region max (1+ max))))))
|
||
|
||
;;;###autoload
|
||
(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).
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order."
|
||
(interactive "P\nr")
|
||
(save-excursion
|
||
(save-restriction
|
||
(narrow-to-region beg end)
|
||
(goto-char (point-min))
|
||
(let ;; To make `end-of-line' and etc. to ignore fields.
|
||
((inhibit-field-text-motion t))
|
||
(sort-subr reverse 'forward-line 'end-of-line)))))
|
||
|
||
;;;###autoload
|
||
(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).
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order."
|
||
(interactive "P\nr")
|
||
(save-excursion
|
||
(save-restriction
|
||
(narrow-to-region beg end)
|
||
(goto-char (point-min))
|
||
(sort-subr reverse
|
||
(function
|
||
(lambda ()
|
||
(while (and (not (eobp)) (looking-at paragraph-separate))
|
||
(forward-line 1))))
|
||
'forward-paragraph))))
|
||
|
||
;;;###autoload
|
||
(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).
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order."
|
||
(interactive "P\nr")
|
||
(save-excursion
|
||
(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 ?\s " " table)
|
||
(modify-syntax-entry ?\t " " table)
|
||
(modify-syntax-entry ?\n " " table)
|
||
(modify-syntax-entry ?\. "_" table) ; for floating pt. numbers. -wsr
|
||
(setq sort-fields-syntax-table table)))
|
||
|
||
(defcustom sort-numeric-base 10
|
||
"The default base used by `sort-numeric-fields'."
|
||
:group 'sort
|
||
:type 'integer)
|
||
;;;###autoload(put 'sort-numeric-base 'safe-local-variable 'integerp)
|
||
|
||
;;;###autoload
|
||
(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,
|
||
which may begin with \"0x\" or \"0\" for hexadecimal and octal values.
|
||
Otherwise, the number is interpreted according to sort-numeric-base.
|
||
With a negative arg, sorts by the ARGth field counted from the right.
|
||
Called from a program, there are three arguments:
|
||
FIELD, BEG and END. BEG and END specify region to sort."
|
||
(interactive "p\nr")
|
||
(let ;; To make `end-of-line' and etc. to ignore fields.
|
||
((inhibit-field-text-motion t))
|
||
(sort-fields-1 field beg end
|
||
(lambda ()
|
||
(sort-skip-fields field)
|
||
(let* ((case-fold-search t)
|
||
(base
|
||
(if (looking-at "\\(0x\\)[0-9a-f]\\|\\(0\\)[0-7]")
|
||
(cond ((match-beginning 1)
|
||
(goto-char (match-end 1))
|
||
16)
|
||
((match-beginning 2)
|
||
(goto-char (match-end 2))
|
||
8)
|
||
(t nil)))))
|
||
(string-to-number (buffer-substring (point)
|
||
(save-excursion
|
||
(forward-sexp 1)
|
||
(point)))
|
||
(or base sort-numeric-base))))
|
||
nil)))
|
||
|
||
;;;;;###autoload
|
||
;;(defun sort-float-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 floating point number in each line of the region. With a
|
||
;;negative arg, sorts by the ARGth field counted from the right. 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 field)
|
||
;; (string-to-number
|
||
;; (buffer-substring
|
||
;; (point)
|
||
;; (save-excursion
|
||
;; (re-search-forward
|
||
;; "[+-]?[0-9]*\.?[0-9]*\\([eE][+-]?[0-9]+\\)?")
|
||
;; (point))))))
|
||
;; nil))
|
||
|
||
;;;###autoload
|
||
(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 ARGth field counted from the right.
|
||
Called from a program, there are three arguments:
|
||
FIELD, BEG and END. BEG and END specify region to sort.
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order."
|
||
(interactive "p\nr")
|
||
(let ;; To make `end-of-line' and etc. to ignore fields.
|
||
((inhibit-field-text-motion t))
|
||
(sort-fields-1 field beg end
|
||
(function (lambda ()
|
||
(sort-skip-fields field)
|
||
nil))
|
||
(function (lambda () (skip-chars-forward "^ \t\n"))))))
|
||
|
||
(defun sort-fields-1 (field beg end startkeyfun endkeyfun)
|
||
(let ((tbl (syntax-table)))
|
||
(if (zerop field) (setq field 1))
|
||
(unwind-protect
|
||
(save-excursion
|
||
(save-restriction
|
||
(narrow-to-region beg end)
|
||
(goto-char (point-min))
|
||
(set-syntax-table sort-fields-syntax-table)
|
||
(sort-subr nil
|
||
'forward-line 'end-of-line
|
||
startkeyfun endkeyfun)))
|
||
(set-syntax-table tbl))))
|
||
|
||
;; Position at the beginning of field N on the current line,
|
||
;; assuming point is initially at the beginning of the line.
|
||
(defun sort-skip-fields (n)
|
||
(if (> n 0)
|
||
;; Skip across N - 1 fields.
|
||
(let ((i (1- n)))
|
||
(while (> i 0)
|
||
(skip-chars-forward " \t")
|
||
(skip-chars-forward "^ \t\n")
|
||
(setq i (1- i)))
|
||
(skip-chars-forward " \t")
|
||
(if (eolp)
|
||
(error "Line has too few fields: %s"
|
||
(buffer-substring
|
||
(save-excursion (beginning-of-line) (point))
|
||
(save-excursion (end-of-line) (point))))))
|
||
(end-of-line)
|
||
;; Skip back across - N - 1 fields.
|
||
(let ((i (1- (- n))))
|
||
(while (> i 0)
|
||
(skip-chars-backward " \t")
|
||
(skip-chars-backward "^ \t\n")
|
||
(setq i (1- i)))
|
||
(skip-chars-backward " \t"))
|
||
(if (bolp)
|
||
(error "Line has too few fields: %s"
|
||
(buffer-substring
|
||
(save-excursion (beginning-of-line) (point))
|
||
(save-excursion (end-of-line) (point)))))
|
||
;; Position at the front of the field
|
||
;; even if moving backwards.
|
||
(skip-chars-backward "^ \t\n")))
|
||
|
||
(defvar sort-regexp-fields-regexp)
|
||
(defvar sort-regexp-record-end)
|
||
|
||
;; Move to the beginning of the next match for record-regexp,
|
||
;; and set sort-regexp-record-end to the end of that match.
|
||
;; If the next match is empty and does not advance point,
|
||
;; skip one character and try again.
|
||
(defun sort-regexp-fields-next-record ()
|
||
(let ((oldpos (point)))
|
||
(and (re-search-forward sort-regexp-fields-regexp nil 'move)
|
||
(setq sort-regexp-record-end (match-end 0))
|
||
(if (= sort-regexp-record-end oldpos)
|
||
(progn
|
||
(forward-char 1)
|
||
(re-search-forward sort-regexp-fields-regexp nil 'move)
|
||
(setq sort-regexp-record-end (match-end 0)))
|
||
t)
|
||
(goto-char (match-beginning 0)))))
|
||
|
||
;;;###autoload
|
||
(defun sort-regexp-fields (reverse record-regexp key-regexp beg end)
|
||
"Sort the region lexicographically as specified by RECORD-REGEXP and KEY.
|
||
RECORD-REGEXP specifies the textual units which should be sorted.
|
||
For example, to sort lines RECORD-REGEXP would be \"^.*$\"
|
||
KEY specifies the part of each record (ie each match for RECORD-REGEXP)
|
||
is to be used for sorting.
|
||
If it is \"\\\\digit\" then the digit'th \"\\\\(...\\\\)\" match field from
|
||
RECORD-REGEXP is used.
|
||
If it is \"\\\\&\" then the whole record is used.
|
||
Otherwise, it is a regular-expression for which to search within the record.
|
||
If a match for KEY is not found within a record then that record is ignored.
|
||
|
||
With a negative prefix arg sorts in reverse order.
|
||
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order.
|
||
|
||
For example: to sort lines in the region by the first word on each line
|
||
starting with the letter \"f\",
|
||
RECORD-REGEXP would be \"^.*$\" and KEY would be \"\\\\=\\<f\\\\w*\\\\>\""
|
||
;; using negative prefix arg to mean "reverse" is now inconsistent with
|
||
;; other sort-.*fields functions but then again this was before, since it
|
||
;; didn't use the magnitude of the arg to specify anything.
|
||
(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-excursion
|
||
(save-restriction
|
||
(narrow-to-region beg end)
|
||
(goto-char (point-min))
|
||
(let (sort-regexp-record-end
|
||
(sort-regexp-fields-regexp record-regexp))
|
||
(re-search-forward sort-regexp-fields-regexp nil t)
|
||
(setq sort-regexp-record-end (point))
|
||
(goto-char (match-beginning 0))
|
||
(sort-subr reverse
|
||
'sort-regexp-fields-next-record
|
||
(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 ()
|
||
(cons (match-beginning n)
|
||
(match-end n))
|
||
;; if there was no such register
|
||
(error (throw 'key nil)))))))))))
|
||
|
||
|
||
(defvar sort-columns-subprocess t)
|
||
|
||
;;;###autoload
|
||
(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 BEG...END 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.
|
||
The variable `sort-fold-case' determines whether alphabetic case affects
|
||
the sort order.
|
||
|
||
Note that `sort-columns' rejects text that contains tabs,
|
||
because tabs could be split across the specified columns
|
||
and it doesn't know how to handle that. Also, when possible,
|
||
it uses the `sort' utility program, which doesn't understand tabs.
|
||
Use \\[untabify] to convert tabs to spaces before sorting."
|
||
(interactive "P\nr")
|
||
(save-excursion
|
||
(let ;; To make `end-of-line' and etc. to ignore fields.
|
||
((inhibit-field-text-motion t)
|
||
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"))
|
||
(if (not (or (memq system-type '(windows-nt))
|
||
(let ((pos beg1) plist fontified)
|
||
(catch 'found
|
||
(while (< pos end1)
|
||
(setq plist (text-properties-at pos))
|
||
(setq fontified (plist-get plist 'fontified))
|
||
(while (consp plist)
|
||
(unless (or (eq (car plist) 'fontified)
|
||
(and (eq (car plist) 'face)
|
||
fontified))
|
||
(throw 'found t))
|
||
(setq plist (cddr plist)))
|
||
(setq pos (next-property-change pos nil end1)))))))
|
||
;; Use the sort utility if we can; it is 4 times as fast.
|
||
;; Do not use it if there are any non-font-lock properties
|
||
;; in the region, since the sort utility would lose the
|
||
;; properties. Tabs are used as field separator; on NetBSD,
|
||
;; sort complains if "\n" is used as field separator.
|
||
(let ((sort-args (list (if reverse "-rt\t" "-t\t")
|
||
(format "-k1.%d,1.%d"
|
||
(1+ col-start)
|
||
(1+ col-end)))))
|
||
(when sort-fold-case
|
||
(push "-f" sort-args))
|
||
(apply #'call-process-region beg1 end1 "sort" t t nil sort-args))
|
||
;; On ms-windows, use Emacs's own facilities.
|
||
(save-excursion
|
||
(save-restriction
|
||
(narrow-to-region beg1 end1)
|
||
(goto-char beg1)
|
||
(sort-subr reverse 'forward-line 'end-of-line
|
||
#'(lambda () (move-to-column col-start) nil)
|
||
#'(lambda () (move-to-column col-end) nil))))))))
|
||
|
||
;;;###autoload
|
||
(defun reverse-region (beg end)
|
||
"Reverse the order of lines in a region.
|
||
From a program takes two point or marker arguments, BEG and END."
|
||
(interactive "r")
|
||
(if (> beg end)
|
||
(let (mid) (setq mid end end beg beg mid)))
|
||
(save-excursion
|
||
;; put beg at the start of a line and end and the end of one --
|
||
;; the largest possible region which fits this criteria
|
||
(goto-char beg)
|
||
(or (bolp) (forward-line 1))
|
||
(setq beg (point))
|
||
(goto-char end)
|
||
;; the test for bolp is for those times when end is on an empty line;
|
||
;; it is probably not the case that the line should be included in the
|
||
;; reversal; it isn't difficult to add it afterward.
|
||
(or (and (eolp) (not (bolp))) (progn (forward-line -1) (end-of-line)))
|
||
(setq end (point-marker))
|
||
;; the real work. this thing cranks through memory on large regions.
|
||
(let (ll (do t))
|
||
(while do
|
||
(goto-char beg)
|
||
(setq ll (cons (buffer-substring (point) (progn (end-of-line) (point)))
|
||
ll))
|
||
(setq do (/= (point) end))
|
||
(delete-region beg (if do (1+ (point)) (point))))
|
||
(while (cdr ll)
|
||
(insert (car ll) "\n")
|
||
(setq ll (cdr ll)))
|
||
(insert (car ll)))))
|
||
|
||
(provide 'sort)
|
||
|
||
;; arch-tag: fbac12be-2a7b-4c8a-9665-264d61f70bd9
|
||
;;; sort.el ends here
|