;;; helm-font --- Font and ucs selection for Helm -*- lexical-binding: t -*-
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;; Copyright (C) 2012 ~ 2018 Thierry Volpiatto <thierry.volpiatto@gmail.com>
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(require 'cl-lib)
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(require 'helm)
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(require 'helm-help)
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(defgroup helm-font nil
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"Related applications to display fonts in helm."
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:group 'helm)
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(defcustom helm-ucs-recent-size 10
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"Number of recent chars to keep."
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:type 'integer
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:group 'helm-font)
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(defcustom helm-ucs-actions
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'(("Insert character" . helm-ucs-insert-char)
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("Insert character name" . helm-ucs-insert-name)
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("Insert character code in hex" . helm-ucs-insert-code)
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("Kill marked characters" . helm-ucs-kill-char)
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("Kill name" . helm-ucs-kill-name)
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("Kill code" . helm-ucs-kill-code))
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"Actions for `helm-source-ucs'."
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:group 'helm-font
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:type '(alist :key-type string :value-type function))
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(defvar helm-ucs-map
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(let ((map (make-sparse-keymap)))
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(set-keymap-parent map helm-map)
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(define-key map (kbd "<C-backspace>") 'helm-ucs-persistent-delete)
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(define-key map (kbd "<C-left>") 'helm-ucs-persistent-backward)
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(define-key map (kbd "<C-right>") 'helm-ucs-persistent-forward)
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(define-key map (kbd "C-c SPC") 'helm-ucs-persistent-insert-space)
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map)
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"Keymap for `helm-ucs'.")
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(defface helm-ucs-char
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'((((class color) (background dark)) (:foreground "Gold")))
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"Face used to display ucs characters."
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:group 'helm-font)
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;;; Xfont selection
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;;
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;;
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(defvar helm-xfonts-cache nil)
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(defvar helm-previous-font nil)
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(defvar helm-source-xfonts
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(helm-build-sync-source "X Fonts"
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:init (lambda ()
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(unless helm-xfonts-cache
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(setq helm-xfonts-cache
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(x-list-fonts "*")))
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;; Save current font so it can be restored in cleanup
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(setq helm-previous-font (cdr (assq 'font (frame-parameters)))))
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:candidates 'helm-xfonts-cache
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:action '(("Copy font to kill ring" . (lambda (elm)
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(kill-new elm)))
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("Set font" . (lambda (elm)
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(kill-new elm)
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(set-frame-font elm 'keep-size)
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(message "Font copied to kill ring"))))
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:cleanup (lambda ()
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;; Restore previous font
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(set-frame-font helm-previous-font 'keep-size))
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:persistent-action (lambda (new-font)
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(set-frame-font new-font 'keep-size)
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(kill-new new-font))
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:persistent-help "Preview font and copy to kill-ring"))
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;;; 𝕌𝕔𝕤 𝕊𝕪𝕞𝕓𝕠𝕝 𝕔𝕠𝕞𝕡𝕝𝕖𝕥𝕚𝕠𝕟
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;;
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;;
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(defvar helm-ucs--max-len nil)
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(defvar helm-ucs--names nil)
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(defvar helm-ucs-history nil)
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(defvar helm-ucs-recent nil
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"Ring of recent `helm-ucs' selections.")
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(defun helm-calculate-ucs-alist-max-len (names)
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"Calculate the length of the longest NAMES list candidate."
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(cl-loop for (_n . v) in names
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maximize (length (format "#x%x:" v)) into code
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maximize (max 1 (string-width (format "%c" v))) into char
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finally return (cons code char)))
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(defun helm-calculate-ucs-hash-table-max-len (names)
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"Calculate the length of the longest NAMES hash table candidate."
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(cl-loop for _n being the hash-keys of names
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using (hash-values v)
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maximize (length (format "#x%x:" v)) into code
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maximize (max 1 (string-width (format "%c" v))) into char
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finally return (cons code char)))
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(defun helm-calculate-ucs-max-len ()
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"Calculate the length of longest `ucs-names' candidate."
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(let ((ucs-struct (ucs-names)))
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(if (hash-table-p ucs-struct)
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(helm-calculate-ucs-hash-table-max-len ucs-struct)
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(helm-calculate-ucs-alist-max-len ucs-struct))))
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(defun helm-ucs-collect-symbols-alist (names)
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"Collect ucs symbols from the NAMES list."
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(cl-loop with pr = (make-progress-reporter
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"collecting ucs names"
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0 (length names))
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for (n . v) in names
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for count from 1
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for xcode = (format "#x%x:" v)
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for len = (length xcode)
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for diff = (- (car helm-ucs--max-len) len)
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for code = (format "(#x%x): " v)
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for char = (propertize (format "%c" v)
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'face 'helm-ucs-char)
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unless (or (string= "" n)
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;; `char-displayable-p' return a font object or
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;; t for some char that are displayable but have
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;; no special font (e.g 10) so filter out char
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;; with no font.
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(not (fontp (char-displayable-p (read xcode)))))
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collect
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(concat code (make-string diff ? )
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char " " n)
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and do (progress-reporter-update pr count)))
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(defun helm-ucs-collect-symbols-hash-table (names)
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"Collect ucs symbols from the NAMES hash-table."
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(cl-loop with pr = (make-progress-reporter
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"collecting ucs names"
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0 (hash-table-count names))
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for n being the hash-keys of names
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using (hash-values v)
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for count from 1
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for xcode = (format "#x%x:" v)
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for len = (length xcode)
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for diff = (- (car helm-ucs--max-len) len)
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for code = (format "(#x%x): " v)
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for char = (propertize (format "%c" v)
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'face 'helm-ucs-char)
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unless (or (string= "" n)
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(not (fontp (char-displayable-p (read xcode)))))
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collect
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(concat code (make-string diff ? )
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char " " n)
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and do (progress-reporter-update pr count)))
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(defun helm-ucs-collect-symbols (ucs-struct)
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"Collect ucs symbols from UCS-STRUCT.
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Depending on the Emacs version, the variable `ucs-names' can
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either be an alist or a hash-table."
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(if (hash-table-p ucs-struct)
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(helm-ucs-collect-symbols-hash-table ucs-struct)
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(helm-ucs-collect-symbols-alist ucs-struct)))
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(defun helm-ucs-init ()
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"Initialize an helm buffer with ucs symbols.
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Only math* symbols are collected."
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(unless helm-ucs--max-len
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(setq helm-ucs--max-len
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(helm-calculate-ucs-max-len)))
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(or helm-ucs--names
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(setq helm-ucs--names
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(helm-ucs-collect-symbols (ucs-names)))))
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;; Actions (insertion)
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(defun helm-ucs-match (candidate n)
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"Return the N part of an ucs CANDIDATE.
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Where N=1 is the ucs code, N=2 the ucs char and N=3 the ucs name."
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(when (string-match
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"^(\\(#x[a-f0-9]+\\)): *\\(.\\) *\\([^:]+\\)+"
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candidate)
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(match-string n candidate)))
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(defun helm-ucs-save-recentest (candidate)
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(let ((lst (cons candidate (delete candidate helm-ucs-recent))))
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(setq helm-ucs-recent
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(if (> (length lst) helm-ucs-recent-size)
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(nbutlast lst 1)
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lst))))
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(defun helm-ucs-insert (candidate n)
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"Insert the N part of CANDIDATE."
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(with-helm-current-buffer
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(helm-ucs-save-recentest candidate)
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(insert (helm-ucs-match candidate n))))
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(defun helm-ucs-insert-char (candidate)
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"Insert ucs char part of CANDIDATE at point."
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(helm-ucs-insert candidate 2))
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(defun helm-ucs-insert-code (candidate)
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"Insert ucs code part of CANDIDATE at point."
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(helm-ucs-insert candidate 1))
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(defun helm-ucs-insert-name (candidate)
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"Insert ucs name part of CANDIDATE at point."
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(helm-ucs-insert candidate 3))
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;; Kill actions
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(defun helm-ucs-kill-char (_candidate)
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"Action that concatenate ucs marked chars."
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(let ((marked (helm-marked-candidates)))
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(cl-loop for candidate in marked
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do (helm-ucs-save-recentest candidate))
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(kill-new (mapconcat (lambda (x)
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(helm-ucs-match x 2))
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marked ""))))
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(defun helm-ucs-kill-code (candidate)
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(helm-ucs-save-recentest candidate)
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(kill-new (helm-ucs-match candidate 1)))
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(defun helm-ucs-kill-name (candidate)
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(helm-ucs-save-recentest candidate)
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(kill-new (helm-ucs-match candidate 3)))
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;; Navigation in current-buffer (persistent)
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(defun helm-ucs-forward-char (_candidate)
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(with-helm-current-buffer
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(forward-char 1)))
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(defun helm-ucs-backward-char (_candidate)
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(with-helm-current-buffer
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(forward-char -1)))
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(defun helm-ucs-delete-backward (_candidate)
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(with-helm-current-buffer
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(delete-char -1)))
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(defun helm-ucs-insert-space (_candidate)
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(with-helm-current-buffer
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(insert " ")))
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(defun helm-ucs-persistent-forward ()
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(interactive)
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(with-helm-alive-p
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(helm-attrset 'action-forward 'helm-ucs-forward-char)
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(helm-execute-persistent-action 'action-forward)))
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(put 'helm-ucs-persistent-forward 'helm-only t)
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(defun helm-ucs-persistent-backward ()
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(interactive)
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(with-helm-alive-p
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(helm-attrset 'action-back 'helm-ucs-backward-char)
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(helm-execute-persistent-action 'action-back)))
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(put 'helm-ucs-persistent-backward 'helm-only t)
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(defun helm-ucs-persistent-delete ()
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(interactive)
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(with-helm-alive-p
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(helm-attrset 'action-delete 'helm-ucs-delete-backward)
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(helm-execute-persistent-action 'action-delete)))
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(put 'helm-ucs-persistent-delete 'helm-only t)
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(defun helm-ucs-persistent-insert-space ()
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(interactive)
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(with-helm-alive-p
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(helm-attrset 'action-insert-space 'helm-ucs-insert-space)
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(helm-execute-persistent-action 'action-insert-space)))
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(defvar helm-source-ucs-recent
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(helm-build-sync-source "Recent UCS"
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:action helm-ucs-actions
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:candidates (lambda () helm-ucs-recent)
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:help-message helm-ucs-help-message
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:keymap helm-ucs-map
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:volatile t))
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(defvar helm-source-ucs
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(helm-build-in-buffer-source "UCS names"
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:data #'helm-ucs-init
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:get-line #'buffer-substring
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:help-message 'helm-ucs-help-message
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:filtered-candidate-transformer
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(lambda (candidates _source) (sort candidates #'helm-generic-sort-fn))
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:action helm-ucs-actions
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:persistent-action (lambda (candidate)
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(helm-ucs-insert-char candidate)
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(helm-force-update))
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:keymap helm-ucs-map)
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"Source for collecting `ucs-names' math symbols.")
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;;;###autoload
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(defun helm-select-xfont ()
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"Preconfigured `helm' to select Xfont."
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(interactive)
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(helm :sources 'helm-source-xfonts
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:buffer "*helm select xfont*"))
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;;;###autoload
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(defun helm-ucs (arg)
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"Preconfigured helm for `ucs-names'.
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Called with a prefix arg force reloading cache."
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(interactive "P")
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(when arg
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(setq helm-ucs--names nil
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helm-ucs--max-len nil
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ucs-names nil))
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(let ((char (helm-aif (char-after) (string it))))
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(helm :sources (list helm-source-ucs-recent helm-source-ucs)
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:history 'helm-ucs-history
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:input (and char (multibyte-string-p char) char)
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:buffer "*helm ucs*")))
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(provide 'helm-font)
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;; Local Variables:
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;; byte-compile-warnings: (not obsolete)
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;; coding: utf-8
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;; indent-tabs-mode: nil
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;; End:
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;;; helm-font.el ends here
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