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;;; upcase-mode.el --- Upcase all input -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: convenience
;; Version: 0.1.0
;; 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:
;; The main entry point for this module, `upcase-transient-mode',
;; temporarily enables a keymap that causes all input to be made
;; upper-case. This map stays active as long as the result of
;; `upcase' applied to the input is different from the input itself,
;; or if there is a value in `upcase-character-map' for the input.
;;; Code:
(defvar upcase-transient-map
(let ((map (make-sparse-keymap)))
(define-key map [remap self-insert-command] #'upcase-self-insert-command)
map)
"The transient keymap that will take effect.")
(defvar upcase-character-map
#s(hash-table data (?- ?_))
"Extra characters to switch.")
(defun upcase-self-insert-command ()
"Wrap `self-insert-command' to upcase the input character.
This also translates keys from the variable
`upcase-character-map' to values from the same variable."
(interactive)
(let ((last-command-event
(gethash last-command-event upcase-character-map
(upcase last-command-event))))
(self-insert-command 1)))
(defun upcase-able-p ()
"Check to see if the current input can be upcased.
Upcased can mean either the result of `upcase' being different
from the original or having a value in `upcase-character-map'."
(let ((case-fold-search nil))
(or (not (char-equal
last-command-event (capitalize last-command-event)))
(gethash last-command-event upcase-character-map))))
;;;###autoload
(defun upcase-transient-mode ()
"Set a transient map that upcases any input.
This map stays active as long as the input can be upcased."
(interactive)
(set-transient-map upcase-transient-map #'upcase-able-p))
(provide 'upcase-mode)
;;; upcase-mode.el ends here
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