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;;; helm-font --- Font and ucs selection for Helm -*- lexical-binding: t -*-
;; Copyright (C) 2012 ~ 2015 Thierry Volpiatto <>
;; 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
;; 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 <>.
;;; Code:
(require 'cl-lib)
(require 'helm)
(require 'helm-help)
(defvar helm-ucs-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map helm-map)
(define-key map (kbd "<C-backspace>") 'helm-ucs-persistent-delete)
(define-key map (kbd "<C-left>") 'helm-ucs-persistent-backward)
(define-key map (kbd "<C-right>") 'helm-ucs-persistent-forward)
(define-key map (kbd "<C-return>") 'helm-ucs-persistent-insert)
"Keymap for `helm-ucs'.")
;;; Xfont selection
(defvar helm-xfonts-cache nil)
(defvar helm-previous-font nil)
(defvar helm-source-xfonts
(helm-build-sync-source "X Fonts"
:init (lambda ()
(unless helm-xfonts-cache
(setq helm-xfonts-cache
(x-list-fonts "*")))
;; Save current font so it can be restored in cleanup
(setq helm-previous-font (cdr (assoc 'font (frame-parameters)))))
:candidates 'helm-xfonts-cache
:action '(("Copy font to kill ring" . (lambda (elm)
(kill-new elm)))
("Set font" . (lambda (elm)
(kill-new elm)
(set-frame-font elm 'keep-size)
(message "Font copied to kill ring"))))
:cleanup (lambda ()
;; Restore previous font
(set-frame-font helm-previous-font 'keep-size))
:persistent-action (lambda (new-font)
(set-frame-font new-font 'keep-size)
(kill-new new-font))
:persistent-help "Preview font and copy to kill-ring"))
;;; π•Œπ•”π•€ π•Šπ•ͺπ•žπ•“π• π• π•”π• π•žπ•‘π•π•–π•₯π•šπ• π•Ÿ
(defvar helm-ucs--max-len 0)
(defvar helm-ucs--names nil)
(defun helm-calculate-ucs-max-len ()
"Calculate the length of longest `ucs-names' candidate."
(cl-loop with count = 0
for (n . v) in (ucs-names)
for len = (length n)
if (> len count)
do (setq count len)
finally return count))
(defun helm-ucs-init ()
"Initialize an helm buffer with ucs symbols.
Only math* symbols are collected."
(unless (> helm-ucs--max-len 0)
(setq helm-ucs--max-len
(or helm-ucs--names
(setq helm-ucs--names
(cl-loop for (n . v) in (ucs-names)
for len = (length n)
for diff = (+ (- helm-ucs--max-len len) 2)
unless (string= "" n)
collect (format "%s:%s%c #x%x"
n (make-string diff ? ) v v)))))
(defun helm-ucs-forward-char (_candidate)
(forward-char 1)))
(defun helm-ucs-backward-char (_candidate)
(forward-char -1)))
(defun helm-ucs-delete-backward (_candidate)
(delete-char -1)))
(defun helm-ucs-insert (candidate n)
(string-match "^\\([^:]+\\): +\\(.\\) \\(#x[a-f0-9]+\\)$" candidate)
(insert (match-string n candidate))))
(defun helm-ucs-insert-name (candidate)
(helm-ucs-insert candidate 1))
(defun helm-ucs-insert-char (candidate)
(helm-ucs-insert candidate 2))
(defun helm-ucs-insert-code (candidate)
(helm-ucs-insert candidate 3))
(defun helm-ucs-persistent-insert ()
(helm-attrset 'action-insert 'helm-ucs-insert-char)
(helm-execute-persistent-action 'action-insert)))
(put 'helm-ucs-persistent-insert 'helm-only t)
(defun helm-ucs-persistent-forward ()
(helm-attrset 'action-forward 'helm-ucs-forward-char)
(helm-execute-persistent-action 'action-forward)))
(put 'helm-ucs-persistent-forward 'helm-only t)
(defun helm-ucs-persistent-backward ()
(helm-attrset 'action-back 'helm-ucs-backward-char)
(helm-execute-persistent-action 'action-back)))
(put 'helm-ucs-persistent-backward 'helm-only t)
(defun helm-ucs-persistent-delete ()
(helm-attrset 'action-delete 'helm-ucs-delete-backward)
(helm-execute-persistent-action 'action-delete)))
(put 'helm-ucs-persistent-delete 'helm-only t)
(defvar helm-source-ucs
(helm-build-in-buffer-source "Ucs names"
:data #'helm-ucs-init
:help-message 'helm-ucs-help-message
:match-part (lambda (candidate) (car (split-string candidate ":")))
(lambda (candidates _source) (sort candidates #'helm-generic-sort-fn))
:action '(("Insert character" . helm-ucs-insert-char)
("Insert character name" . helm-ucs-insert-name)
("Insert character code in hex" . helm-ucs-insert-code)
("Forward char" . helm-ucs-forward-char)
("Backward char" . helm-ucs-backward-char)
("Delete char backward" . helm-ucs-delete-backward)))
"Source for collecting `ucs-names' math symbols.")
(defun helm-select-xfont ()
"Preconfigured `helm' to select Xfont."
(helm :sources 'helm-source-xfonts
:buffer "*helm select xfont*"))
(defun helm-ucs ()
"Preconfigured helm for `ucs-names' math symbols."
(helm :sources 'helm-source-ucs
:keymap helm-ucs-map))
(provide 'helm-font)
;; Local Variables:
;; byte-compile-warnings: (not cl-functions obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; End:
;;; helm-font.el ends here
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