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diff --git a/sys/jao-minibuffer.el b/sys/jao-minibuffer.el
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+;;; jao-minibuffer.el --- using the minibuffer to report status  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020  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 t)
+(defvar jao-minibuffer-notification-timeout 5)
+
+(defconst jao-minibuffer--name " *Minibuf-0*")
+
+(defun jao-minibuffer--trim (s w)
+  (if (<= (length s) w)
+      (format (format "%%%ds" 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--aligned (&optional w currentp)
+  (let* ((msg (if currentp
+                  (jao-minibuffer--current)
+                (format-mode-line (or jao-minibuffer-notification
+                                      jao-minibuffer-info))))
+         (msg (propertize (string-trim msg) :minibuffer-message t)))
+    (when (not (string-empty-p msg))
+      (if jao-minibuffer-align-right-p
+          (let* ((mw (if jao-minibuffer-maximized-frames-p
+                         (frame-width)
+                       (window-width (minibuffer-window))))
+                 (w (mod (or w (length (current-message))) mw))
+                 (w (- mw w jao-minibuffer-right-margin)))
+            (if (> w 0) (jao-minibuffer--trim msg w) ""))
+        (concat " · " msg)))))
+
+(defun jao-minibuffer--set-message (msg)
+  (let ((msg (string-trim (replace-regexp-in-string "\n" " " msg))))
+    (concat msg (jao-minibuffer--aligned (length msg) t))))
+
+;;;###autoload
+(defun jao-minibuffer-refresh ()
+  (interactive "")
+  (with-current-buffer jao-minibuffer--name
+    (erase-buffer)
+    (insert (or (jao-minibuffer--aligned) ""))))
+
+;;;###autoload
+(defun jao-minibuffer-add-variable (variable-name &optional append)
+  (add-to-list 'jao-minibuffer-info `(:eval ,variable-name) append))
+
+(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))
+
+(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