lisp/emacs-lisp/helpers.el

   1 ;;; helpers.el --- Some non-essential library extensions  -*- lexical-binding:t -*-
   2
   3 ;; Copyright (C) 2013 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: convenience
   7 ;; Package: emacs
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (defsubst hash-table-keys (hash-table)
  29   "Return a list of keys in HASH-TABLE."
  30   (let ((keys '()))
  31     (maphash (lambda (k _v) (push k keys)) hash-table)
  32     keys))
  33
  34 (defsubst hash-table-values (hash-table)
  35   "Return a list of values in HASH-TABLE."
  36   (let ((values '()))
  37     (maphash (lambda (_k v) (push v values)) hash-table)
  38     values))
  39
  40 (defsubst string-trim-left (string)
  41   "Remove leading whitespace from STRING."
  42   (if (string-match "\\`[ \t\n\r]+" string)
  43       (replace-match "" t t string)
  44     string))
  45
  46 (defsubst string-trim-right (string)
  47   "Remove trailing whitespace from STRING."
  48   (if (string-match "[ \t\n\r]+\\'" string)
  49       (replace-match "" t t string)
  50     string))
  51
  52 (defsubst string-trim (string)
  53   "Remove leading and trailing whitespace from STRING."
  54   (string-trim-left (string-trim-right string)))
  55
  56 (provide 'helpers)
  57
  58 ;;; helpers.el ends here