my-emacs-d/elpa/helm-unicode-20160715.533/helm-unicode.el
2016-09-15 13:54:46 +02:00

73 lines
2.4 KiB
EmacsLisp

;;; helm-unicode.el --- Helm command for unicode characters. -*- lexical-binding: t -*-
;; Copyright © 2015 Emanuel Evans
;; Version: 0.0.4
;; Package-Version: 20160715.533
;; Package-Requires: ((helm "1.9.8") (emacs "24.4"))
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; A helm command for looking up unicode characters by name 😉.
;;; Code:
(require 'helm)
(require 'helm-utils)
(defvar helm-unicode-names nil
"Internal cache variable for unicode characters. Should not be changed by the user.")
(defun helm-unicode-format-char-pair (char-pair)
"Formats a char pair for helm unicode search."
(let ((name (car char-pair))
(symbol (cdr char-pair)))
(format "%s %c" name symbol)))
(defun helm-unicode-build-candidates ()
"Builds the candidate list."
(sort
(mapcar 'helm-unicode-format-char-pair (ucs-names))
#'string-lessp))
(defun helm-unicode-source ()
"Builds the helm Unicode source. Initialize the lookup cache if necessary."
(unless helm-unicode-names
(setq helm-unicode-names (helm-unicode-build-candidates)))
(helm-build-sync-source "unicode-characters"
:candidates helm-unicode-names
:filtered-candidate-transformer (lambda (candidates _source) (sort candidates #'helm-generic-sort-fn))
:action '(("Insert Character" . helm-unicode-insert-char))))
(defun helm-unicode-insert-char (candidate)
"Insert CANDIDATE into the main buffer."
(insert (substring candidate -1)))
;;;###autoload
(defun helm-unicode (arg)
"Precofigured `helm' for looking up unicode characters by name.
With prefix ARG, reinitialize the cache."
(interactive "P")
(when arg (setq helm-unicode-names nil))
(helm :sources (helm-unicode-source)
:buffer "*helm-unicode-search*"))
(provide 'helm-unicode)
;;; helm-unicode.el ends here