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string-strip.el 1.0
From: |
Andreas Roehler |
Subject: |
string-strip.el 1.0 |
Date: |
Mon, 08 Jan 2007 10:35:09 +0100 |
User-agent: |
Thunderbird 1.5.0.4 (X11/20060516) |
;;; string-strip.el 1.0 --- Strip CHARS from STRING
;; Copyright (C) 2007 Andreas Roehler
;; Author: Andreas Roehler <address@hidden>
;; Keywords: convenience
;; This file 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 file 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, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Needed a function to correct user-input, i.e. wrongly inserted
;; white spaces at the end or the beginning.
;; " foo " -> "foo"
;; Used `comment-string-strip' from Stefan Monier's
;; newcomment.el to that purpose, which worked fine so
;; far. However, found it unnecessary difficult to
;; employ, as it requires handling of three arguments,
;; where just one was sufficient in the cases I needed
;; it.
;; Meanwhile a discussion in emacs-devel took place, which was
;; helpful in many respects. You may view it at
;; http://comments.gmane.org/gmane.emacs.devel/55961
;; Lars Hansen <address@hidden> provided a
;; regexp for the case, the string may be composed of (and
;; preserve) newlines. In the context given now set
;; `string-strip-preserve' to "\\(\\(?:.\\|\n\\)*?\\)" if
;; you need this.
;; Finally I found it useful, not just to make the ends
;; customizable, but the middle part too: Now its
;; completely up to the user to decide, what the string
;; should contain and what chars are to strip from it.
;;; Code:
;; (setq strip-chars-before "[ \t\r\n\f]*")
(defcustom strip-chars-before "[ \t\r\n\f]*"
"Regexp indicating which chars shall be stripped before STRING - which
is defined by `string-strip-preserve'"
:type 'string
:group 'convenience)
;; (setq strip-chars-after "[ \t\r\n\f]*")
(defcustom strip-chars-after "[ \t\r\n\f]*\\'"
"Regexp indicating which chars shall be stripped after STRING - which
is defined by `string-strip-preserve'"
:type 'string
:group 'convenience)
;; (setq string-strip-preserve "\\(\\(?:.\\|\n\\)*?\\)"
(defcustom string-strip-preserve "\\(.*?\\)"
"Regexp indicating which chars shall be constitutes of STRING
thus being preserved - whereas `strip-chars-after' and
`strip-chars-before' indicate what class of chars to strip from
beginning or end of STRING
You may customize this variable. For Example if your string to preserve
may include newlines, use \"\\(\\(?:.\\|\n\\)*?\\)\" - an expression
posted by Lars Hansen"
:type 'string
:group 'convenience)
(defun string-strip (str)
"Return a copy of STR with leading and trailing CHARS removed.
Customize `strip-chars-before' and `strip-chars-after' respectively.
Default is `[[:space:]\n]*', i.e. spaces, tabs and newlines."
(interactive)
(save-match-data
(string-match
(concat "\\`" strip-chars-before string-strip-preserve
strip-chars-after "\\'") str)
(match-string 1 str)))
(provide 'string-strip)
;;; string-strip.el ends here
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