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;;; input-conf.el --- My configurations of input methods  -*- lexical-binding: t; -*-

;; Copyright (C) 2022  Jean Sévère Durand

;; Author: Jean Sévère Durand <durand@jsdurand.xyz>
;; Keywords: convenience, abbrev, emulations, i18n

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; I want to use the built-in input methods for inserting in other
;; languages than English.

;;; Code:

;; core package
(require 'quail)

;;; Chinese-zozy

;; This does not work.  I shall find another way to do this.
(defun durand-zozy-remap-keys ()
  "Remap smoe keys for the input method \"Chinese-zozy\"."
  (let ((map (quail-translation-keymap)))
    (define-key map (vector ?\") "3")))

(remove-hook 'quail-activate-hook #'durand-zozy-remap-keys)

;;; Default input method

(setq-default default-input-method "devanagari-kyoto-harvard")

;;; Short-cut headlong selection of input methods.

(defvar durand-input-method-list nil
  "The list of input methods that I oft use.")

(setq durand-input-method-list
      (list "devanagari-kyoto-harvard"
            "tamil99"
            "chinese-zozy"))

(defun durand-toggle-input ()
  "Toggle input method with my customizations."
  (interactive)
  (cond
   ((null current-input-method)
    (let ((input-method
           (minibuffer-with-setup-hook
               #'durand-headlong-minibuffer-setup-hook
             (completing-read
              "Input method: " durand-input-method-list
              nil t nil nil "devanagari-kyoto-harvard"))))
      (activate-input-method input-method)))
   ((deactivate-input-method))))

(define-key global-map (vector ?\C-\\) #'durand-toggle-input)
(define-key global-map (vector 3 ?i) #'durand-toggle-input)

;;; Custom french keyboard layout

;; I am used to the french keyboard, so it would be most convenient if
;; the quail packages can automatically translate the keys according
;; to this layout.

(cond
 ((assoc "durand-fr" quail-keyboard-layout-alist #'string=)
  (setcdr
   (assoc "durand-fr" quail-keyboard-layout-alist #'string=)
   "\
                              \
  &1é2\"3'4(5§6è7!8ç9à0)°-_<>  \
  aAzZeErRtTyYuUiIoOpP^¨$*    \
  qQsSdDfFgGhHjJkKlLmMù%`£    \
  wWxXcCvVbBnN,?;.:/=+        \
                              "))
 (t
  (setq
   quail-keyboard-layout-alist
   (cons
    (cons
     "durand-fr"
     "\
                              \
  &1é2\"3'4(5§6è7!8ç9à0)°-_<>  \
  aAzZeErRtTyYuUiIoOpP^¨$*    \
  qQsSdDfFgGhHjJkKlLmMù%`£    \
  wWxXcCvVbBnN,?;.:/=+        \
                              ")
    quail-keyboard-layout-alist))))

(quail-set-keyboard-layout "durand-fr")

;;; Convert a string to its equivalent under an input-method

(defun durand-convert-string-by-input-method (str method)
  "Convert the string STR to its equivalent under the input-method \
METHOD.

Basically, this functions activates the input method METHOD and
then enters the string STR, and returns the inputted string."
  (let ((prev-input-method current-input-method)
        (temp-buffer (generate-new-buffer " *temp*" t))
        result)
    (switch-to-buffer temp-buffer)
    (activate-input-method method)
    (execute-kbd-macro (vconcat str))
    (activate-input-method prev-input-method)
    (setq
     result
     (buffer-substring-no-properties (point-min) (point-max)))
    (kill-buffer temp-buffer)
    result))

(defun durand-convert-region-by-input-method (start end method)
  "Convert the string in the region between START and END by the
input-method METHOD.

See the function `durand-convert-string-by-input-method' for
more."
  (interactive
   (append
    (cond ((region-active-p)
           (list (region-beginning) (region-end)))
          ((list (point) (point))))
    (list (read-input-method-name "By which input method: "))))
  (let* ((str (buffer-substring-no-properties start end))
         (converted
          (durand-convert-string-by-input-method str method)))
    (delete-region start end)
    (goto-char start)
    (insert converted)))

(provide 'input-conf)
;;; input-conf.el ends here