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;;; reading.el --- minor mode for reading -*- lexical-binding: t; -*-
;;; Code:
(defgroup reading nil
"Group for Reading mode customizations."
:prefix "reading-"
:group 'convenience)
(defcustom reading-vars '((indicate-empty-lines . nil)
(indicate-buffer-boundaries . nil))
"Alist of variables to set in function `reading-mode'.
The car of each cell is the variable name, and the cdr is the
value to set it to."
:type '(alist :key-type variable
:value-type sexp))
(defcustom reading-modes '((display-fill-column-indicator-mode . -1)
(blink-cursor-mode . -1))
"Alist of modes to set in function `reading-mode'.
The car of each cell is the function name, and the cdr is the
value to call it with."
:type '(alist :key-type function
:value-type sexp))
;;; Internal
(defvar reading--remembered-template "reading--remembered-%s-value"
"The template passed to `format' for remembered modes and variables.")
(defun reading--remember (things func)
"Apply FUNC to THINGS, remembering their previous value for later."
(declare (indent 1))
(unless (listp things)
(setq things (list things)))
(dolist (thing things)
(set (make-local-variable
(intern (format reading--remembered-template thing)))
(and (boundp thing)
(symbol-value thing)))
(funcall func thing)))
(defun reading--recall (things func)
"Recall previously remembered THINGS by applying FUNC to them.
FUNC should be a function with the signature (THING REMEMBERED-SETTING)."
(declare (indent 1))
(unless (listp things)
(setq things (list things)))
(dolist (thing things)
(with-demoted-errors "reading--recall: %S"
(let ((value (symbol-value
(intern
(format reading--remembered-template thing)))))
(funcall func thing value)))))
;;; Mode
;;;###autoload
(define-minor-mode reading-mode
"A mode for reading."
:init-value nil
:lighter " Read"
:keymap (make-sparse-keymap)
(if reading-mode
;; turn on
(progn
(reading--remember (mapcar #'car reading-vars)
(lambda (var)
(set (make-local-variable var)
(cdr (assoc var reading-vars)))))
(reading--remember (mapcar #'car reading-modes)
(lambda (mode)
(funcall mode (cdr (assoc mode reading-modes))))))
;; turn off
(reading--recall (mapcar #'car reading-vars)
(lambda (var orig-val)
(set (make-local-variable var) orig-val)))
(reading--recall (mapcar #'car reading-modes)
(lambda (mode orig-setting)
(funcall mode (if orig-setting +1 -1))))))
(provide 'reading)
;;; reading.el ends here
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