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;;; jao-minibuffer.el --- using the minibuffer to report status -*- lexical-binding: t; -*-
;; Copyright (C) 2020, 2021, 2022 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-msg-info '(""))
(defvar jao-minibuffer-align-right t)
(defvar jao-minibuffer-right-margin (if window-system 0 1))
(defvar jao-minibuffer-maximized-frames-p t)
(defvar jao-minibuffer-frame-width nil)
(defvar jao-minibuffer-active-buffer-line-color "azure4")
(defvar jao-minibuffer-inactive-buffer-line-color "grey25")
(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 w (- w))) s)
(substring s 0 w)))
(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 (&optional info)
(let* ((info (or info jao-minibuffer-info))
(info (if jao-minibuffer-align-right info (reverse info))))
(mapconcat #'string-trim
(seq-remove #'string-blank-p (mapcar 'format-mode-line info))
" ")))
(defun jao-minibuffer--aligned (w)
(let* ((msg (jao-minibuffer--format-info))
(msg (cond (jao-minibuffer-align-right (string-trim msg))
(t (string-trim-left msg)))))
(unless (string-empty-p msg)
(let ((msg (propertize msg :minibuffer-message t))
(w (- (jao-minibuffer--width) w jao-minibuffer-right-margin)))
(if (> w 0) (jao-minibuffer--trim msg w) "")))))
(defun jao-minibuffer--insert (msg)
(let ((hack (derived-mode-p 'pdf-view-mode 'doc-view-mode)))
(with-current-buffer jao-minibuffer--name
(delete-region (point-min) (point-max))
(insert msg)
(when hack (other-window 1) (other-window -1)))))
(defun jao-minibuffer--strip-prev (msg)
(if-let ((n (text-property-any 0 (length msg) :minibuffer-message t msg)))
(string-trim (substring msg 0 n))
msg))
(defun jao-minibuffer--prefix (msgs)
(when-let (p (string-join (butlast msgs) "\n"))
(unless (string-blank-p p) (concat p "\n"))))
(defun jao-minibuffer--format-msg (msg)
(let* ((msgs (mapcar #'jao-minibuffer--strip-prev (split-string msg "\n" t)))
(msgs (cl-remove-if (lambda (s) (get-text-property 0 'invisible s)) msgs))
(prefix (jao-minibuffer--prefix msgs))
(msg (or (car (last msgs)) ""))
(w (string-width msg)))
(if jao-minibuffer-align-right
(concat prefix msg (jao-minibuffer--aligned w))
(concat prefix (jao-minibuffer--aligned (+ 3 w)) " " msg))))
(defun jao-minibuffer--set-message (msg)
(when jao-minibuffer-mode (jao-minibuffer--format-msg (or msg ""))))
(setq set-message-function #'jao-minibuffer--set-message)
(defun jao-minibuffer--add-variable (list-name variable-name &optional order)
(let ((v `(:eval ,variable-name)))
(set list-name (remove v (symbol-value list-name)))
(add-to-ordered-list list-name v order)))
;;;###autoload
(defun jao-minibuffer-add-variable (variable-name &optional order)
(jao-minibuffer--add-variable 'jao-minibuffer-info variable-name order))
;;;###autoload
(defun jao-minibuffer-add-msg-variable (variable-name &optional order)
(jao-minibuffer--add-variable 'jao-minibuffer-msg-info variable-name order))
;;;###autoload
(defun jao-minibuffer-remove-variable (variable-name)
(let ((v `(:eval ,variable-name)))
(setq jao-minibuffer-info (remove v jao-minibuffer-info))
(setq jao-minibuffer-msg-info (remove v jao-minibuffer-info))))
;;;###autoload
(define-minor-mode jao-minibuffer-mode
"Show minibuffer status"
:global t :lighter "" :group 'jao
(if jao-minibuffer-mode
(progn (advice-add 'select-window :after #'jao-minibuffer-refresh)
(advice-add 'force-mode-line-update :after #'jao-minibuffer-refresh)
(setq clear-message-function #'jao-minibuffer-refresh)
(jao-minibuffer-refresh))
(advice-remove 'select-window #'jao-minibuffer-refresh)
(advice-remove 'force-mode-line-update #'jao-minibuffer-refresh)
(setq clear-message-function nil)
(jao-minibuffer--insert "")))
;;;###autoload
(defun jao-minibuffer-refresh (&rest _ignore)
(interactive)
(when jao-minibuffer-mode
(let ((jao-minibuffer-mode nil)
(msg (when jao-minibuffer-msg-info
(jao-minibuffer--format-info jao-minibuffer-msg-info))))
(jao-minibuffer--insert (jao-minibuffer--format-msg (or msg ""))))))
(provide 'jao-minibuffer)
;;; jao-minibuffer.el ends here
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