;;; tvi970.el --- terminal support for the Televideo 970  -*- lexical-binding: t -*-

;; Copyright (C) 1992, 2001-2022 Free Software Foundation, Inc.

;; Author: Jim Blandy <jimb@occs.cs.oberlin.edu>
;; Keywords: terminals
;; Created: January 1992

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(defvar tvi970-terminal-map
  (let ((map (make-sparse-keymap)))

    ;; Miscellaneous keys
    (dolist (key-binding
             '(;; These are set up by termcap or terminfo
               ;; ("\eOP"	[kp-f1])
               ;; ("\eOQ"	[kp-f2])
               ;; ("\eOR"	[kp-f3])
               ;; ("\eOS"	[kp-f4])

               ;; These might be set by terminfo.
               ("\e[H"	[home])
               ("\e[Z"	[backtab])
               ("\e[i"	[print])
               ("\e[@"	[insert])
               ("\e[L"	[insertline])
               ("\e[M"	[deleteline])
               ("\e[U"	[next]) ;; actually the `page' key

               ;; These won't be set up by either.
               ("\eOm"	[kp-subtract])
               ("\eOl"	[kp-separator])
               ("\eOn"	[kp-decimal])
               ("\eOM"	[kp-enter])

               ;; These won't be set up by either.
               ("\e[K"	[key_eol])	;; Not an X keysym
               ("\e[J"	[key_eos])	;; Not an X keysym
               ("\e[2J"	[key_clear])	;; Not an X keysym
               ("\e[P"	[key_dc])	;; Not an X keysym
               ("\e[g"	[S-tab])	;; Not an X keysym
               ("\e[2N"	[clearentry])	;; Not an X keysym
               ("\e[2K"	[S-clearentry])	;; Not an X keysym
               ("\e[E"	[?\C-j])	;; Not an X keysym
               ("\e[g"	[S-backtab])	;; Not an X keysym
               ("\e[?1i"	[key_sprint]) ;; Not an X keysym
               ("\e[4h"	[key_sic])            ;; Not an X keysym
               ("\e[4l"	[S-delete])           ;; Not an X keysym
               ("\e[Q"	[S-insertline])       ;; Not an X keysym
               ("\e[1Q"	[key_sdl])            ;; Not an X keysym
               ("\e[19l"	[key_seol])   ;; Not an X keysym
               ("\e[19h"	[S-erasepage]) ;; Not an X keysym
               ("\e[V"	[S-page])              ;; Not an X keysym
               ("\eS"	[send])                ;; Not an X keysym
               ("\e5"	[S-send])              ;; Not an X keysym
               ))
      (define-key map (car key-binding) (nth 1 key-binding)))


    ;; The numeric keypad keys.
    (dotimes (i 10)
      (define-key map (format "\eO%c" (+ i ?p))
        (vector (intern (format "kp-%d" i)))))
    ;; The numbered function keys.
    (dotimes (i 16)
      (define-key map (format "\e?%c" (+ i ?a))
        (vector (intern (format "f%d" (1+ i)))))
      (define-key map (format "\e?%c" (+ i ?A))
        (vector (intern (format "S-f%d" (1+ i))))))
    map))

(defun terminal-init-tvi970 ()
  "Terminal initialization function for tvi970."
  ;; Use inheritance to let the main keymap override these defaults.
  ;; This way we don't override terminfo-derived settings or settings
  ;; made in the init file.
  (let ((m (copy-keymap tvi970-terminal-map)))
    (set-keymap-parent m (keymap-parent input-decode-map))
    (set-keymap-parent input-decode-map m))
  (tvi970-set-keypad-mode 1))


;; Should keypad numbers send ordinary digits or distinct escape sequences?
(define-minor-mode tvi970-set-keypad-mode
  "Toggle alternate keypad mode on TVI 970 keypad.

In alternate keypad mode, the keys send distinct escape
sequences, meaning that they can have their own bindings,
independent of the normal number keys.

When disabled, the terminal enters numeric keypad mode, in
which the keypad's keys act as ordinary digits."
  :variable (terminal-parameter nil 'tvi970-keypad-numeric)
  (send-string-to-terminal
   (if (terminal-parameter nil 'tvi970-keypad-numeric) "\e=" "\e>")))

(provide 'term/tvi970)

;;; tvi970.el ends here
