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;;; jao-minibuffer.el --- using the minibuffer to report status -*- lexical-binding: t; -*-
;; Copyright (C) 2020, 2021 jao
;; Author: jao <mail@jao.io>
;; Keywords: extensions
;; 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:
;; Simple asynchronous display of information in the minibuffer.
;;; Code:
(defvar jao-minibuffer-info ())
(defvar jao-minibuffer-notification nil)
(defvar jao-minibuffer-align-right-p t)
(defvar jao-minibuffer-right-margin (if window-system 0 1))
(defvar jao-minibuffer-maximized-frames-p nil)
(defvar jao-minibuffer-frame-width nil)
(defvar jao-minibuffer-notification-timeout 5)
(defvar jao-minibuffer-enabled-p t)
(defconst jao-minibuffer--name " *Minibuf-0*")
(defun jao-minibuffer--trim (s w)
(if (<= (string-width (or s "")) w)
(format (format "%%%ds" (if jao-minibuffer-align-right-p w (- w))) s)
(substring s 0 w)))
(defun jao-minibuffer--current ()
(with-current-buffer jao-minibuffer--name
(buffer-substring (point-min) (point-max))))
(defun jao-minibuffer--width ()
(cond ((numberp jao-minibuffer-frame-width) jao-minibuffer-frame-width)
(jao-minibuffer-maximized-frames-p (frame-width))
(t (min (frame-width) (window-width (minibuffer-window))))))
(defun jao-minibuffer--format-info ()
(mapconcat 'string-trim
(seq-filter (lambda (s) (not (string-blank-p s)))
(mapcar 'format-mode-line
(if jao-minibuffer-align-right-p
jao-minibuffer-info
(reverse jao-minibuffer-info))))
" "))
(defun jao-minibuffer--aligned (&optional w currentp)
(let* ((msg (cond (currentp (jao-minibuffer--current))
(jao-minibuffer-notification
(format-mode-line jao-minibuffer-notification))
(t (jao-minibuffer--format-info))))
(msg (if jao-minibuffer-align-right-p
(string-trim msg)
(string-trim-left msg)))
(msg (propertize msg :minibuffer-message t)))
(when (not (string-empty-p msg))
(let* ((mw (jao-minibuffer--width))
(w (mod (or w (string-width (or (current-message) ""))) mw))
(w (- mw w jao-minibuffer-right-margin)))
(if (> w 0) (jao-minibuffer--trim msg w) "")))))
(defun jao-minibuffer--set-message (msg)
(if current-minibuffer-command
msg
(let* ((msg (string-trim (replace-regexp-in-string "\n" " " msg)))
(msg (if (string-blank-p msg) msg (concat msg " "))))
(if jao-minibuffer-align-right-p
(concat msg (jao-minibuffer--aligned (string-width (or msg "")) t))
(concat (jao-minibuffer--aligned (+ 3 (string-width (or msg ""))) t)
" " msg)))))
(defun jao-minibuffer--insert (msg)
(with-current-buffer jao-minibuffer--name
(erase-buffer)
(insert msg)))
;;;###autoload
(defun jao-minibuffer-refresh ()
(interactive)
(when jao-minibuffer-enabled-p
(jao-minibuffer--insert (or (jao-minibuffer--aligned) ""))))
;;;###autoload
(defun jao-minibuffer-add-variable (variable-name &optional order)
(add-to-ordered-list 'jao-minibuffer-info `(:eval ,variable-name) order))
(defvar jao-minibuffer--notification-timer nil)
(defun jao-minibuffer--start-notification-timer (timeout)
(interactive)
(when jao-minibuffer--notification-timer
(cancel-timer jao-minibuffer--notification-timer))
(setq jao-minibuffer--notification-timer
(run-with-idle-timer (or timeout jao-minibuffer-notification-timeout)
nil
'jao-minibuffer-pop-notification)))
;;;###autoload
(defun jao-minibuffer-push-notification (msg &optional timeout)
(setq jao-minibuffer-notification msg)
(jao-minibuffer--start-notification-timer timeout)
(jao-minibuffer-refresh))
;;;###autoload
(defun jao-minibuffer-pop-notification ()
(interactive)
(setq jao-minibuffer-notification nil)
(jao-minibuffer-refresh))
;;;###autoload
(defun jao-minibuffer-toggle ()
(interactive)
(setq jao-minibuffer-enabled-p (not jao-minibuffer-enabled-p))
(if jao-minibuffer-enabled-p
(jao-minibuffer-refresh)
(jao-minibuffer--insert "")))
(setq set-message-function #'jao-minibuffer--set-message)
(setq clear-message-function #'jao-minibuffer-refresh)
(setq resize-mini-windows nil)
(provide 'jao-minibuffer)
;;; jao-minibuffer.el ends here
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