helpers.el 1.86 KB
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;;; helpers.el --- Some non-essential library extensions  -*- lexical-binding:t -*-
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;; Copyright (C) 2013 Free Software Foundation, Inc.

;; Maintainer: FSF
;; Keywords: convenience
;; Package: emacs

;; 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:

;;; Code:

(defsubst hash-table-keys (hash-table)
  "Return a list of keys in HASH-TABLE."
  (let ((keys '()))
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    (maphash (lambda (k _v) (push k keys)) hash-table)
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    keys))

(defsubst hash-table-values (hash-table)
  "Return a list of values in HASH-TABLE."
  (let ((values '()))
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    (maphash (lambda (_k v) (push v values)) hash-table)
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    values))

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(defsubst string-join (strings &optional separator)
  "Join all STRINGS using SEPARATOR."
  (mapconcat 'identity strings separator))

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(defsubst string-trim-left (string)
  "Remove leading whitespace from STRING."
  (if (string-match "\\`[ \t\n\r]+" string)
      (replace-match "" t t string)
    string))

(defsubst string-trim-right (string)
  "Remove trailing whitespace from STRING."
  (if (string-match "[ \t\n\r]+\\'" string)
      (replace-match "" t t string)
    string))

(defsubst string-trim (string)
  "Remove leading and trailing whitespace from STRING."
  (string-trim-left (string-trim-right string)))

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(provide 'helpers)

;;; helpers.el ends here