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+;;; exwm.el --- Emacs X Window Manager  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2015-2021 Free Software Foundation, Inc.
+
+;; Author: Chris Feng <chris.w.feng@gmail.com>
+;; Maintainer: Adrián Medraño Calvo <adrian@medranocalvo.com>
+;; Version: 0.26
+;; Package-Requires: ((xelb "0.18"))
+;; Keywords: unix
+;; URL: https://github.com/ch11ng/exwm
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Overview
+;; --------
+;; EXWM (Emacs X Window Manager) is a full-featured tiling X window manager
+;; for Emacs built on top of [XELB](https://github.com/ch11ng/xelb).
+;; It features:
+;; + Fully keyboard-driven operations
+;; + Hybrid layout modes (tiling & stacking)
+;; + Dynamic workspace support
+;; + ICCCM/EWMH compliance
+;; + (Optional) RandR (multi-monitor) support
+;; + (Optional) Built-in system tray
+
+;; Installation & configuration
+;; ----------------------------
+;; Here are the minimal steps to get EXWM working:
+;; 1. Install XELB and EXWM, and make sure they are in `load-path'.
+;; 2. In '~/.emacs', add following lines (please modify accordingly):
+;;
+;;    (require 'exwm)
+;;    (require 'exwm-config)
+;;    (exwm-config-example)
+;;
+;; 3. Link or copy the file 'xinitrc' to '~/.xinitrc'.
+;; 4. Launch EXWM in a console (e.g. tty1) with
+;;
+;;    xinit -- vt01
+;;
+;; You should additionally hide the menu-bar, tool-bar, etc to increase the
+;; usable space.  Please check the wiki (https://github.com/ch11ng/exwm/wiki)
+;; for more detailed instructions on installation, configuration, usage, etc.
+
+;; References:
+;; + dwm (http://dwm.suckless.org/)
+;; + i3 wm (https://i3wm.org/)
+;; + Also see references within each required library.
+
+;;; Code:
+
+(require 'server)
+(require 'exwm-core)
+(require 'exwm-workspace)
+(require 'exwm-layout)
+(require 'exwm-floating)
+(require 'exwm-manage)
+(require 'exwm-input)
+
+(defgroup exwm nil
+  "Emacs X Window Manager."
+  :tag "EXWM"
+  :version "25.3"
+  :group 'applications
+  :prefix "exwm-")
+
+(defcustom exwm-init-hook nil
+  "Normal hook run when EXWM has just finished initialization."
+  :type 'hook)
+
+(defcustom exwm-exit-hook nil
+  "Normal hook run just before EXWM exits."
+  :type 'hook)
+
+(defcustom exwm-update-class-hook nil
+  "Normal hook run when window class is updated."
+  :type 'hook)
+
+(defcustom exwm-update-title-hook nil
+  "Normal hook run when window title is updated."
+  :type 'hook)
+
+(defcustom exwm-blocking-subrs '(x-file-dialog x-popup-dialog x-select-font)
+  "Subrs (primitives) that would normally block EXWM."
+  :type '(repeat function))
+
+(defcustom exwm-replace 'ask
+  "Whether to replace existing window manager."
+  :type '(radio (const :tag "Ask" ask)
+                (const :tag "Replace by default" t)
+                (const :tag "Do not replace" nil)))
+
+(defconst exwm--server-name "server-exwm"
+  "Name of the subordinate Emacs server.")
+
+(defvar exwm--server-process nil "Process of the subordinate Emacs server.")
+
+(defun exwm-reset ()
+  "Reset the state of the selected window (non-fullscreen, line-mode, etc)."
+  (interactive)
+  (exwm--log)
+  (with-current-buffer (window-buffer)
+    (when (derived-mode-p 'exwm-mode)
+      (when (exwm-layout--fullscreen-p)
+        (exwm-layout-unset-fullscreen))
+      ;; Force refresh
+      (exwm-layout--refresh)
+      (call-interactively #'exwm-input-grab-keyboard))))
+
+;;;###autoload
+(defun exwm-restart ()
+  "Restart EXWM."
+  (interactive)
+  (exwm--log)
+  (when (exwm--confirm-kill-emacs "[EXWM] Restart? " 'no-check)
+    (let* ((attr (process-attributes (emacs-pid)))
+           (args (cdr (assq 'args attr)))
+           (ppid (cdr (assq 'ppid attr)))
+           (pargs (cdr (assq 'args (process-attributes ppid)))))
+      (cond
+       ((= ppid 1)
+        ;; The parent is the init process.  This probably means this
+        ;; instance is an emacsclient.  Anyway, start a control instance
+        ;; to manage the subsequent ones.
+        (call-process (car command-line-args))
+        (kill-emacs))
+       ((string= args pargs)
+        ;; This is a subordinate instance.  Return a magic number to
+        ;; inform the parent (control instance) to start another one.
+        (kill-emacs ?R))
+       (t
+        ;; This is the control instance.  Keep starting subordinate
+        ;; instances until told to exit.
+        ;; Run `server-force-stop' if it exists.
+        (run-hooks 'kill-emacs-hook)
+        (with-temp-buffer
+          (while (= ?R (shell-command-on-region (point) (point) args))))
+        (kill-emacs))))))
+
+(defun exwm--update-desktop (xwin)
+  "Update _NET_WM_DESKTOP."
+  (exwm--log "#x%x" xwin)
+  (with-current-buffer (exwm--id->buffer xwin)
+    (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                     (make-instance 'xcb:ewmh:get-_NET_WM_DESKTOP
+                                    :window xwin)))
+          desktop)
+      (when reply
+        (setq desktop (slot-value reply 'value))
+        (cond
+         ((eq desktop 4294967295.)
+          (unless (or (not exwm--floating-frame)
+                      (eq exwm--frame exwm-workspace--current)
+                      (and exwm--desktop
+                           (= desktop exwm--desktop)))
+            (exwm-layout--show xwin (frame-root-window exwm--floating-frame)))
+          (setq exwm--desktop desktop))
+         ((and desktop
+               (< desktop (exwm-workspace--count))
+               (if exwm--desktop
+                   (/= desktop exwm--desktop)
+                 (/= desktop (exwm-workspace--position exwm--frame))))
+          (exwm-workspace-move-window desktop xwin))
+         (t
+          (exwm-workspace--set-desktop xwin)))))))
+
+(defun exwm--update-window-type (id &optional force)
+  "Update _NET_WM_WINDOW_TYPE."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and exwm-window-type (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:ewmh:get-_NET_WM_WINDOW_TYPE
+                                      :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm-window-type (append (slot-value reply 'value) nil)))))))
+
+(defun exwm--update-class (id &optional force)
+  "Update WM_CLASS."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and exwm-instance-name exwm-class-name (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_CLASS :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm-instance-name (slot-value reply 'instance-name)
+                exwm-class-name (slot-value reply 'class-name))
+          (when (and exwm-instance-name exwm-class-name)
+            (run-hooks 'exwm-update-class-hook)))))))
+
+(defun exwm--update-utf8-title (id &optional force)
+  "Update _NET_WM_NAME."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (when (or force (not exwm-title))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:ewmh:get-_NET_WM_NAME :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm-title (slot-value reply 'value))
+          (when exwm-title
+            (setq exwm--title-is-utf8 t)
+            (run-hooks 'exwm-update-title-hook)))))))
+
+(defun exwm--update-ctext-title (id &optional force)
+  "Update WM_NAME."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (or exwm--title-is-utf8
+                (and exwm-title (not force)))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_NAME :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm-title (slot-value reply 'value))
+          (when exwm-title
+            (run-hooks 'exwm-update-title-hook)))))))
+
+(defun exwm--update-title (id)
+  "Update _NET_WM_NAME or WM_NAME."
+  (exwm--log "#x%x" id)
+  (exwm--update-utf8-title id)
+  (exwm--update-ctext-title id))
+
+(defun exwm--update-transient-for (id &optional force)
+  "Update WM_TRANSIENT_FOR."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and exwm-transient-for (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_TRANSIENT_FOR
+                                      :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm-transient-for (slot-value reply 'value)))))))
+
+(defun exwm--update-normal-hints (id &optional force)
+  "Update WM_NORMAL_HINTS."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and (not force)
+                 (or exwm--normal-hints-x exwm--normal-hints-y
+                     exwm--normal-hints-width exwm--normal-hints-height
+                     exwm--normal-hints-min-width exwm--normal-hints-min-height
+                     exwm--normal-hints-max-width exwm--normal-hints-max-height
+                     ;; FIXME: other fields
+                     ))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_NORMAL_HINTS
+                                      :window id))))
+        (when (and reply (slot-value reply 'flags)) ;nil when destroyed
+          (with-slots (flags x y width height min-width min-height max-width
+                             max-height base-width base-height ;; win-gravity
+                             )
+              reply
+            (unless (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:USPosition))
+              (setq exwm--normal-hints-x x exwm--normal-hints-y y))
+            (unless (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:USSize))
+              (setq exwm--normal-hints-width width
+                    exwm--normal-hints-height height))
+            (unless (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:PMinSize))
+              (setq exwm--normal-hints-min-width min-width
+                    exwm--normal-hints-min-height min-height))
+            (unless (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:PMaxSize))
+              (setq exwm--normal-hints-max-width max-width
+                    exwm--normal-hints-max-height max-height))
+            (unless (or exwm--normal-hints-min-width
+                        (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:PBaseSize)))
+              (setq exwm--normal-hints-min-width base-width
+                    exwm--normal-hints-min-height base-height))
+            ;; (unless (= 0 (logand flags xcb:icccm:WM_SIZE_HINTS:PWinGravity))
+            ;;   (setq exwm--normal-hints-win-gravity win-gravity))
+            (setq exwm--fixed-size
+                  (and exwm--normal-hints-min-width
+                       exwm--normal-hints-min-height
+                       exwm--normal-hints-max-width
+                       exwm--normal-hints-max-height
+                       (/= 0 exwm--normal-hints-min-width)
+                       (/= 0 exwm--normal-hints-min-height)
+                       (= exwm--normal-hints-min-width
+                          exwm--normal-hints-max-width)
+                       (= exwm--normal-hints-min-height
+                          exwm--normal-hints-max-height)))))))))
+
+(defun exwm--update-hints (id &optional force)
+  "Update WM_HINTS."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and (not force) exwm--hints-input exwm--hints-urgency)
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_HINTS :window id))))
+        (when (and reply (slot-value reply 'flags)) ;nil when destroyed
+          (with-slots (flags input initial-state) reply
+            (when flags
+              (unless (= 0 (logand flags xcb:icccm:WM_HINTS:InputHint))
+                (setq exwm--hints-input (when input (= 1 input))))
+              (unless (= 0 (logand flags xcb:icccm:WM_HINTS:StateHint))
+                (setq exwm-state initial-state))
+              (unless (= 0 (logand flags xcb:icccm:WM_HINTS:UrgencyHint))
+                (setq exwm--hints-urgency t))))
+          (when (and exwm--hints-urgency
+                     (not (eq exwm--frame exwm-workspace--current)))
+            (unless (frame-parameter exwm--frame 'exwm-urgency)
+              (set-frame-parameter exwm--frame 'exwm-urgency t)
+              (setq exwm-workspace--switch-history-outdated t))))))))
+
+(defun exwm--update-protocols (id &optional force)
+  "Update WM_PROTOCOLS."
+  (exwm--log "#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and exwm--protocols (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:get-WM_PROTOCOLS
+                                      :window id))))
+        (when reply                     ;nil when destroyed
+          (setq exwm--protocols (append (slot-value reply 'value) nil)))))))
+
+(defun exwm--update-struts-legacy (id)
+  "Update _NET_WM_STRUT."
+  (exwm--log "#x%x" id)
+  (let ((pair (assq id exwm-workspace--id-struts-alist))
+        reply struts)
+    (unless (and pair (< 4 (length (cdr pair))))
+      (setq reply (xcb:+request-unchecked+reply exwm--connection
+                      (make-instance 'xcb:ewmh:get-_NET_WM_STRUT
+                                     :window id)))
+      (when reply
+        (setq struts (slot-value reply 'value))
+        (if pair
+            (setcdr pair struts)
+          (push (cons id struts) exwm-workspace--id-struts-alist))
+        (exwm-workspace--update-struts))
+      ;; Update workareas.
+      (exwm-workspace--update-workareas)
+      ;; Update workspaces.
+      (dolist (f exwm-workspace--list)
+        (exwm-workspace--set-fullscreen f)))))
+
+(defun exwm--update-struts-partial (id)
+  "Update _NET_WM_STRUT_PARTIAL."
+  (exwm--log "#x%x" id)
+  (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                   (make-instance 'xcb:ewmh:get-_NET_WM_STRUT_PARTIAL
+                                  :window id)))
+        struts pair)
+    (when reply
+      (setq struts (slot-value reply 'value)
+            pair (assq id exwm-workspace--id-struts-alist))
+      (if pair
+          (setcdr pair struts)
+        (push (cons id struts) exwm-workspace--id-struts-alist))
+      (exwm-workspace--update-struts))
+    ;; Update workareas.
+    (exwm-workspace--update-workareas)
+    ;; Update workspaces.
+    (dolist (f exwm-workspace--list)
+      (exwm-workspace--set-fullscreen f))))
+
+(defun exwm--update-struts (id)
+  "Update _NET_WM_STRUT_PARTIAL or _NET_WM_STRUT."
+  (exwm--log "#x%x" id)
+  (exwm--update-struts-partial id)
+  (exwm--update-struts-legacy id))
+
+(defun exwm--on-PropertyNotify (data _synthetic)
+  "Handle PropertyNotify event."
+  (let ((obj (make-instance 'xcb:PropertyNotify))
+        atom id buffer)
+    (xcb:unmarshal obj data)
+    (setq id (slot-value obj 'window)
+          atom (slot-value obj 'atom))
+    (exwm--log "atom=%s(%s)" (x-get-atom-name atom exwm-workspace--current) atom)
+    (setq buffer (exwm--id->buffer id))
+    (if (not (buffer-live-p buffer))
+        ;; Properties of unmanaged X windows.
+        (cond ((= atom xcb:Atom:_NET_WM_STRUT)
+               (exwm--update-struts-legacy id))
+              ((= atom xcb:Atom:_NET_WM_STRUT_PARTIAL)
+               (exwm--update-struts-partial id)))
+      (with-current-buffer buffer
+        (cond ((= atom xcb:Atom:_NET_WM_WINDOW_TYPE)
+               (exwm--update-window-type id t))
+              ((= atom xcb:Atom:WM_CLASS)
+               (exwm--update-class id t))
+              ((= atom xcb:Atom:_NET_WM_NAME)
+               (exwm--update-utf8-title id t))
+              ((= atom xcb:Atom:WM_NAME)
+               (exwm--update-ctext-title id t))
+              ((= atom xcb:Atom:WM_TRANSIENT_FOR)
+               (exwm--update-transient-for id t))
+              ((= atom xcb:Atom:WM_NORMAL_HINTS)
+               (exwm--update-normal-hints id t))
+              ((= atom xcb:Atom:WM_HINTS)
+               (exwm--update-hints id t))
+              ((= atom xcb:Atom:WM_PROTOCOLS)
+               (exwm--update-protocols id t))
+              ((= atom xcb:Atom:_NET_WM_USER_TIME)) ;ignored
+              (t
+               (exwm--log "Unhandled: %s(%d)"
+                          (x-get-atom-name atom exwm-workspace--current)
+                          atom)))))))
+
+(defun exwm--on-ClientMessage (raw-data _synthetic)
+  "Handle ClientMessage event."
+  (let ((obj (make-instance 'xcb:ClientMessage))
+        type id data)
+    (xcb:unmarshal obj raw-data)
+    (setq type (slot-value obj 'type)
+          id (slot-value obj 'window)
+          data (slot-value (slot-value obj 'data) 'data32))
+    (exwm--log "atom=%s(%s)" (x-get-atom-name type exwm-workspace--current)
+               type)
+    (cond
+     ;; _NET_NUMBER_OF_DESKTOPS.
+     ((= type xcb:Atom:_NET_NUMBER_OF_DESKTOPS)
+      (let ((current (exwm-workspace--count))
+            (requested (elt data 0)))
+        ;; Only allow increasing/decreasing the workspace number by 1.
+        (cond
+         ((< current requested)
+          (make-frame))
+         ((and (> current requested)
+               (> current 1))
+          (let ((frame (car (last exwm-workspace--list))))
+            (exwm-workspace--get-remove-frame-next-workspace frame)
+            (delete-frame frame))))))
+     ;; _NET_CURRENT_DESKTOP.
+     ((= type xcb:Atom:_NET_CURRENT_DESKTOP)
+      (exwm-workspace-switch (elt data 0)))
+     ;; _NET_ACTIVE_WINDOW.
+     ((= type xcb:Atom:_NET_ACTIVE_WINDOW)
+      (let ((buffer (exwm--id->buffer id))
+            iconic window)
+        (when (buffer-live-p buffer)
+          (with-current-buffer buffer
+            (when (eq exwm--frame exwm-workspace--current)
+              (if exwm--floating-frame
+                  (select-frame exwm--floating-frame)
+                (setq iconic (exwm-layout--iconic-state-p))
+                (when iconic
+                  ;; State change: iconic => normal.
+                  (set-window-buffer (frame-selected-window exwm--frame)
+                                     (current-buffer)))
+                ;; Focus transfer.
+                (setq window (get-buffer-window nil t))
+                (when (or iconic
+                          (not (eq window (selected-window))))
+                  (select-window window))))))))
+     ;; _NET_CLOSE_WINDOW.
+     ((= type xcb:Atom:_NET_CLOSE_WINDOW)
+      (let ((buffer (exwm--id->buffer id)))
+        (when (buffer-live-p buffer)
+          (exwm--defer 0 #'kill-buffer buffer))))
+     ;; _NET_WM_MOVERESIZE
+     ((= type xcb:Atom:_NET_WM_MOVERESIZE)
+      (let ((direction (elt data 2))
+            (buffer (exwm--id->buffer id)))
+        (unless (and buffer
+                     (not (buffer-local-value 'exwm--floating-frame buffer)))
+          (cond ((= direction
+                    xcb:ewmh:_NET_WM_MOVERESIZE_SIZE_KEYBOARD)
+                 ;; FIXME
+                 )
+                ((= direction
+                    xcb:ewmh:_NET_WM_MOVERESIZE_MOVE_KEYBOARD)
+                 ;; FIXME
+                 )
+                ((= direction xcb:ewmh:_NET_WM_MOVERESIZE_CANCEL)
+                 (exwm-floating--stop-moveresize))
+                ;; In case it's a workspace frame.
+                ((and (not buffer)
+                      (catch 'break
+                        (dolist (f exwm-workspace--list)
+                          (when (or (eq id (frame-parameter f 'exwm-outer-id))
+                                    (eq id (frame-parameter f 'exwm-id)))
+                            (throw 'break t)))
+                        nil)))
+                (t
+                 ;; In case it's a floating frame,
+                 ;; move the corresponding X window instead.
+                 (unless buffer
+                   (catch 'break
+                     (dolist (pair exwm--id-buffer-alist)
+                       (with-current-buffer (cdr pair)
+                         (when
+                             (and exwm--floating-frame
+                                  (or (eq id
+                                          (frame-parameter exwm--floating-frame
+                                                           'exwm-outer-id))
+                                      (eq id
+                                          (frame-parameter exwm--floating-frame
+                                                           'exwm-id))))
+                           (setq id exwm--id)
+                           (throw 'break nil))))))
+                 ;; Start to move it.
+                 (exwm-floating--start-moveresize id direction))))))
+     ;; _NET_REQUEST_FRAME_EXTENTS
+     ((= type xcb:Atom:_NET_REQUEST_FRAME_EXTENTS)
+      (let ((buffer (exwm--id->buffer id))
+            top btm)
+        (if (or (not buffer)
+                (not (buffer-local-value 'exwm--floating-frame buffer)))
+            (setq top 0
+                  btm 0)
+          (setq top (window-header-line-height)
+                btm (window-mode-line-height)))
+        (xcb:+request exwm--connection
+            (make-instance 'xcb:ewmh:set-_NET_FRAME_EXTENTS
+                           :window id
+                           :left 0
+                           :right 0
+                           :top top
+                           :bottom btm)))
+      (xcb:flush exwm--connection))
+     ;; _NET_WM_DESKTOP.
+     ((= type xcb:Atom:_NET_WM_DESKTOP)
+      (let ((buffer (exwm--id->buffer id)))
+        (when (buffer-live-p buffer)
+          (exwm-workspace-move-window (elt data 0) id))))
+     ;; _NET_WM_STATE
+     ((= type xcb:Atom:_NET_WM_STATE)
+      (let ((action (elt data 0))
+            (props (list (elt data 1) (elt data 2)))
+            (buffer (exwm--id->buffer id))
+            props-new)
+        ;; only support _NET_WM_STATE_FULLSCREEN / _NET_WM_STATE_ADD for frames
+        (when (and (not buffer)
+                   (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN props)
+                   (= action xcb:ewmh:_NET_WM_STATE_ADD))
+          (xcb:+request
+              exwm--connection
+              (make-instance 'xcb:ewmh:set-_NET_WM_STATE
+                             :window id
+                             :data (vector xcb:Atom:_NET_WM_STATE_FULLSCREEN)))
+          (xcb:flush exwm--connection))
+        (when buffer                    ;ensure it's managed
+          (with-current-buffer buffer
+            ;; _NET_WM_STATE_FULLSCREEN
+            (when (or (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN props)
+                      (memq xcb:Atom:_NET_WM_STATE_ABOVE props))
+              (cond ((= action xcb:ewmh:_NET_WM_STATE_ADD)
+                     (unless (exwm-layout--fullscreen-p)
+                       (exwm-layout-set-fullscreen id))
+                     (push xcb:Atom:_NET_WM_STATE_FULLSCREEN props-new))
+                    ((= action xcb:ewmh:_NET_WM_STATE_REMOVE)
+                     (when (exwm-layout--fullscreen-p)
+                       (exwm-layout-unset-fullscreen id)))
+                    ((= action xcb:ewmh:_NET_WM_STATE_TOGGLE)
+                     (if (exwm-layout--fullscreen-p)
+                         (exwm-layout-unset-fullscreen id)
+                       (exwm-layout-set-fullscreen id)
+                       (push xcb:Atom:_NET_WM_STATE_FULLSCREEN props-new)))))
+            ;; _NET_WM_STATE_DEMANDS_ATTENTION
+            ;; FIXME: check (may require other properties set)
+            (when (memq xcb:Atom:_NET_WM_STATE_DEMANDS_ATTENTION props)
+              (when (= action xcb:ewmh:_NET_WM_STATE_ADD)
+                (unless (eq exwm--frame exwm-workspace--current)
+                  (set-frame-parameter exwm--frame 'exwm-urgency t)
+                  (setq exwm-workspace--switch-history-outdated t)))
+              ;; xcb:ewmh:_NET_WM_STATE_REMOVE?
+              ;; xcb:ewmh:_NET_WM_STATE_TOGGLE?
+              )
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:ewmh:set-_NET_WM_STATE
+                               :window id :data (vconcat props-new)))
+            (xcb:flush exwm--connection)))))
+     ((= type xcb:Atom:WM_PROTOCOLS)
+      (let ((type (elt data 0)))
+        (cond ((= type xcb:Atom:_NET_WM_PING)
+               (setq exwm-manage--ping-lock nil))
+              (t (exwm--log "Unhandled WM_PROTOCOLS of type: %d" type)))))
+     ((= type xcb:Atom:WM_CHANGE_STATE)
+      (let ((buffer (exwm--id->buffer id)))
+        (when (and (buffer-live-p buffer)
+                   (= (elt data 0) xcb:icccm:WM_STATE:IconicState))
+          (with-current-buffer buffer
+            (if exwm--floating-frame
+                (call-interactively #'exwm-floating-hide)
+              (bury-buffer))))))
+     (t
+      (exwm--log "Unhandled: %s(%d)"
+                 (x-get-atom-name type exwm-workspace--current) type)))))
+
+(defun exwm--on-SelectionClear (data _synthetic)
+  "Handle SelectionClear events."
+  (exwm--log)
+  (let ((obj (make-instance 'xcb:SelectionClear))
+        owner selection)
+    (xcb:unmarshal obj data)
+    (setq owner (slot-value obj 'owner)
+          selection (slot-value obj 'selection))
+    (when (and (eq owner exwm--wmsn-window)
+               (eq selection xcb:Atom:WM_S0))
+      (exwm-exit))))
+
+(defun exwm--init-icccm-ewmh ()
+  "Initialize ICCCM/EWMH support."
+  (exwm--log)
+  ;; Handle PropertyNotify event
+  (xcb:+event exwm--connection 'xcb:PropertyNotify #'exwm--on-PropertyNotify)
+  ;; Handle relevant client messages
+  (xcb:+event exwm--connection 'xcb:ClientMessage #'exwm--on-ClientMessage)
+  ;; Handle SelectionClear
+  (xcb:+event exwm--connection 'xcb:SelectionClear #'exwm--on-SelectionClear)
+  ;; Set _NET_SUPPORTED
+  (xcb:+request exwm--connection
+      (make-instance 'xcb:ewmh:set-_NET_SUPPORTED
+                     :window exwm--root
+                     :data (vector
+                            ;; Root windows properties.
+                            xcb:Atom:_NET_SUPPORTED
+                            xcb:Atom:_NET_CLIENT_LIST
+                            xcb:Atom:_NET_CLIENT_LIST_STACKING
+                            xcb:Atom:_NET_NUMBER_OF_DESKTOPS
+                            xcb:Atom:_NET_DESKTOP_GEOMETRY
+                            xcb:Atom:_NET_DESKTOP_VIEWPORT
+                            xcb:Atom:_NET_CURRENT_DESKTOP
+                            ;; xcb:Atom:_NET_DESKTOP_NAMES
+                            xcb:Atom:_NET_ACTIVE_WINDOW
+                            ;; xcb:Atom:_NET_WORKAREA
+                            xcb:Atom:_NET_SUPPORTING_WM_CHECK
+                            ;; xcb:Atom:_NET_VIRTUAL_ROOTS
+                            ;; xcb:Atom:_NET_DESKTOP_LAYOUT
+                            ;; xcb:Atom:_NET_SHOWING_DESKTOP
+
+                            ;; Other root window messages.
+                            xcb:Atom:_NET_CLOSE_WINDOW
+                            ;; xcb:Atom:_NET_MOVERESIZE_WINDOW
+                            xcb:Atom:_NET_WM_MOVERESIZE
+                            ;; xcb:Atom:_NET_RESTACK_WINDOW
+                            xcb:Atom:_NET_REQUEST_FRAME_EXTENTS
+
+                            ;; Application window properties.
+                            xcb:Atom:_NET_WM_NAME
+                            ;; xcb:Atom:_NET_WM_VISIBLE_NAME
+                            ;; xcb:Atom:_NET_WM_ICON_NAME
+                            ;; xcb:Atom:_NET_WM_VISIBLE_ICON_NAME
+                            xcb:Atom:_NET_WM_DESKTOP
+                            ;;
+                            xcb:Atom:_NET_WM_WINDOW_TYPE
+                            ;; xcb:Atom:_NET_WM_WINDOW_TYPE_DESKTOP
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_DOCK
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_TOOLBAR
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_MENU
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_SPLASH
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_DROPDOWN_MENU
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_POPUP_MENU
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_TOOLTIP
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_NOTIFICATION
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_COMBO
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_DND
+                            xcb:Atom:_NET_WM_WINDOW_TYPE_NORMAL
+                            ;;
+                            xcb:Atom:_NET_WM_STATE
+                            ;; xcb:Atom:_NET_WM_STATE_MODAL
+                            ;; xcb:Atom:_NET_WM_STATE_STICKY
+                            ;; xcb:Atom:_NET_WM_STATE_MAXIMIZED_VERT
+                            ;; xcb:Atom:_NET_WM_STATE_MAXIMIZED_HORZ
+                            ;; xcb:Atom:_NET_WM_STATE_SHADED
+                            ;; xcb:Atom:_NET_WM_STATE_SKIP_TASKBAR
+                            ;; xcb:Atom:_NET_WM_STATE_SKIP_PAGER
+                            xcb:Atom:_NET_WM_STATE_HIDDEN
+                            xcb:Atom:_NET_WM_STATE_FULLSCREEN
+                            ;; xcb:Atom:_NET_WM_STATE_ABOVE
+                            ;; xcb:Atom:_NET_WM_STATE_BELOW
+                            xcb:Atom:_NET_WM_STATE_DEMANDS_ATTENTION
+                            ;; xcb:Atom:_NET_WM_STATE_FOCUSED
+                            ;;
+                            xcb:Atom:_NET_WM_ALLOWED_ACTIONS
+                            xcb:Atom:_NET_WM_ACTION_MOVE
+                            xcb:Atom:_NET_WM_ACTION_RESIZE
+                            xcb:Atom:_NET_WM_ACTION_MINIMIZE
+                            ;; xcb:Atom:_NET_WM_ACTION_SHADE
+                            ;; xcb:Atom:_NET_WM_ACTION_STICK
+                            ;; xcb:Atom:_NET_WM_ACTION_MAXIMIZE_HORZ
+                            ;; xcb:Atom:_NET_WM_ACTION_MAXIMIZE_VERT
+                            xcb:Atom:_NET_WM_ACTION_FULLSCREEN
+                            xcb:Atom:_NET_WM_ACTION_CHANGE_DESKTOP
+                            xcb:Atom:_NET_WM_ACTION_CLOSE
+                            ;; xcb:Atom:_NET_WM_ACTION_ABOVE
+                            ;; xcb:Atom:_NET_WM_ACTION_BELOW
+                            ;;
+                            xcb:Atom:_NET_WM_STRUT
+                            xcb:Atom:_NET_WM_STRUT_PARTIAL
+                            ;; xcb:Atom:_NET_WM_ICON_GEOMETRY
+                            ;; xcb:Atom:_NET_WM_ICON
+                            xcb:Atom:_NET_WM_PID
+                            ;; xcb:Atom:_NET_WM_HANDLED_ICONS
+                            ;; xcb:Atom:_NET_WM_USER_TIME
+                            ;; xcb:Atom:_NET_WM_USER_TIME_WINDOW
+                            xcb:Atom:_NET_FRAME_EXTENTS
+                            ;; xcb:Atom:_NET_WM_OPAQUE_REGION
+                            ;; xcb:Atom:_NET_WM_BYPASS_COMPOSITOR
+
+                            ;; Window manager protocols.
+                            xcb:Atom:_NET_WM_PING
+                            ;; xcb:Atom:_NET_WM_SYNC_REQUEST
+                            ;; xcb:Atom:_NET_WM_FULLSCREEN_MONITORS
+
+                            ;; Other properties.
+                            xcb:Atom:_NET_WM_FULL_PLACEMENT)))
+  ;; Create a child window for setting _NET_SUPPORTING_WM_CHECK
+  (let ((new-id (xcb:generate-id exwm--connection)))
+    (setq exwm--guide-window new-id)
+    (xcb:+request exwm--connection
+        (make-instance 'xcb:CreateWindow
+                       :depth 0
+                       :wid new-id
+                       :parent exwm--root
+                       :x -1
+                       :y -1
+                       :width 1
+                       :height 1
+                       :border-width 0
+                       :class xcb:WindowClass:InputOnly
+                       :visual 0
+                       :value-mask xcb:CW:OverrideRedirect
+                       :override-redirect 1))
+    ;; Set _NET_WM_NAME.  Must be set to the name of the window manager, as
+    ;; required by wm-spec.
+    (xcb:+request exwm--connection
+        (make-instance 'xcb:ewmh:set-_NET_WM_NAME
+                       :window new-id :data "EXWM"))
+    (dolist (i (list exwm--root new-id))
+      ;; Set _NET_SUPPORTING_WM_CHECK
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:ewmh:set-_NET_SUPPORTING_WM_CHECK
+                         :window i :data new-id))))
+  ;; Set _NET_DESKTOP_VIEWPORT (we don't support large desktop).
+  (xcb:+request exwm--connection
+      (make-instance 'xcb:ewmh:set-_NET_DESKTOP_VIEWPORT
+                     :window exwm--root
+                     :data [0 0]))
+  (xcb:flush exwm--connection))
+
+(defun exwm--wmsn-acquire (replace)
+  "Acquire the WM_Sn selection.
+
+REPLACE specifies what to do in case there already is a window
+manager.  If t, replace it, if nil, abort and ask the user if `ask'."
+  (exwm--log "%s" replace)
+  (with-slots (owner)
+      (xcb:+request-unchecked+reply exwm--connection
+          (make-instance 'xcb:GetSelectionOwner
+                         :selection xcb:Atom:WM_S0))
+    (when (/= owner xcb:Window:None)
+      (when (eq replace 'ask)
+        (setq replace (yes-or-no-p "Replace existing window manager? ")))
+      (when (not replace)
+        (user-error "Other window manager detected")))
+    (let ((new-owner (xcb:generate-id exwm--connection)))
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:CreateWindow
+                         :depth 0
+                         :wid new-owner
+                         :parent exwm--root
+                         :x -1
+                         :y -1
+                         :width 1
+                         :height 1
+                         :border-width 0
+                         :class xcb:WindowClass:CopyFromParent
+                         :visual 0
+                         :value-mask 0
+                         :override-redirect 0))
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:ewmh:set-_NET_WM_NAME
+                         :window new-owner :data "EXWM: exwm--wmsn-window"))
+      (xcb:+request-checked+request-check exwm--connection
+          (make-instance 'xcb:SetSelectionOwner
+                         :selection xcb:Atom:WM_S0
+                         :owner new-owner
+                         :time xcb:Time:CurrentTime))
+      (with-slots (owner)
+          (xcb:+request-unchecked+reply exwm--connection
+              (make-instance 'xcb:GetSelectionOwner
+                             :selection xcb:Atom:WM_S0))
+        (unless (eq owner new-owner)
+          (error "Could not acquire ownership of WM selection")))
+      ;; Wait for the other window manager to terminate.
+      (when (/= owner xcb:Window:None)
+        (let (reply)
+          (cl-dotimes (i exwm--wmsn-acquire-timeout)
+            (setq reply (xcb:+request-unchecked+reply exwm--connection
+                            (make-instance 'xcb:GetGeometry :drawable owner)))
+            (when (not reply)
+              (cl-return))
+            (message "Waiting for other window manager to quit... %ds" i)
+            (sleep-for 1))
+          (when reply
+            (error "Other window manager did not release selection in time"))))
+      ;; announce
+      (let* ((cmd (make-instance 'xcb:ClientMessageData
+                                 :data32 (vector xcb:Time:CurrentTime
+                                                 xcb:Atom:WM_S0
+                                                 new-owner
+                                                 0
+                                                 0)))
+             (cm (make-instance 'xcb:ClientMessage
+                                               :window exwm--root
+                                               :format 32
+                                               :type xcb:Atom:MANAGER
+                                               :data cmd))
+             (se (make-instance 'xcb:SendEvent
+                         :propagate 0
+                         :destination exwm--root
+                         :event-mask xcb:EventMask:NoEvent
+                         :event (xcb:marshal cm exwm--connection))))
+        (xcb:+request exwm--connection se))
+      (setq exwm--wmsn-window new-owner))))
+
+;;;###autoload
+(cl-defun exwm-init (&optional frame)
+  "Initialize EXWM."
+  (interactive)
+  (exwm--log "%s" frame)
+  (if frame
+      ;; The frame might not be selected if it's created by emacslicnet.
+      (select-frame-set-input-focus frame)
+    (setq frame (selected-frame)))
+  (when (not (eq 'x (framep frame)))
+    (message "[EXWM] Not running under X environment")
+    (cl-return-from exwm-init))
+  (when exwm--connection
+    (exwm--log "EXWM already running")
+    (cl-return-from exwm-init))
+  (condition-case err
+      (progn
+        (exwm-enable 'undo)               ;never initialize again
+        (setq exwm--connection (xcb:connect))
+        (set-process-query-on-exit-flag (slot-value exwm--connection 'process)
+                                        nil) ;prevent query message on exit
+        (setq exwm--root
+              (slot-value (car (slot-value
+                                (xcb:get-setup exwm--connection) 'roots))
+                          'root))
+        ;; Initialize ICCCM/EWMH support
+        (xcb:icccm:init exwm--connection t)
+        (xcb:ewmh:init exwm--connection t)
+        ;; Try to register window manager selection.
+        (exwm--wmsn-acquire exwm-replace)
+        (when (xcb:+request-checked+request-check exwm--connection
+                  (make-instance 'xcb:ChangeWindowAttributes
+                                 :window exwm--root
+                                 :value-mask xcb:CW:EventMask
+                                 :event-mask
+                                 xcb:EventMask:SubstructureRedirect))
+          (error "Other window manager is running"))
+        ;; Disable some features not working well with EXWM
+        (setq use-dialog-box nil
+              confirm-kill-emacs #'exwm--confirm-kill-emacs)
+        (exwm--lock)
+        (exwm--init-icccm-ewmh)
+        (exwm-layout--init)
+        (exwm-floating--init)
+        (exwm-manage--init)
+        (exwm-workspace--init)
+        (exwm-input--init)
+        (exwm--unlock)
+        (exwm-workspace--post-init)
+        (exwm-input--post-init)
+        (run-hooks 'exwm-init-hook)
+        ;; Manage existing windows
+        (exwm-manage--scan))
+    (user-error)
+    ((quit error)
+     (exwm-exit)
+     ;; Rethrow error
+     (warn "[EXWM] EXWM fails to start (%s: %s)" (car err) (cdr err)))))
+
+
+;;;###autoload
+(defun exwm-exit ()
+  "Exit EXWM."
+  (interactive)
+  (exwm--log)
+  (run-hooks 'exwm-exit-hook)
+  (setq confirm-kill-emacs nil)
+  ;; Exit modules.
+  (exwm-input--exit)
+  (exwm-manage--exit)
+  (exwm-workspace--exit)
+  (exwm-floating--exit)
+  (exwm-layout--exit)
+  (when exwm--connection
+    (xcb:flush exwm--connection)
+    (xcb:disconnect exwm--connection))
+  (setq exwm--connection nil))
+
+;;;###autoload
+(defun exwm-enable (&optional undo)
+  "Enable/Disable EXWM."
+  (exwm--log "%s" undo)
+  (pcase undo
+    (`undo                              ;prevent reinitialization
+     (remove-hook 'window-setup-hook #'exwm-init)
+     (remove-hook 'after-make-frame-functions #'exwm-init))
+    (`undo-all                          ;attempt to revert everything
+     (remove-hook 'window-setup-hook #'exwm-init)
+     (remove-hook 'after-make-frame-functions #'exwm-init)
+     (remove-hook 'kill-emacs-hook #'exwm--server-stop)
+     (dolist (i exwm-blocking-subrs)
+       (advice-remove i #'exwm--server-eval-at)))
+    (_                                  ;enable EXWM
+     (setq frame-resize-pixelwise t     ;mandatory; before init
+           window-resize-pixelwise t)
+     ;; Ignore unrecognized command line arguments.  This can be helpful
+     ;; when EXWM is launched by some session manager.
+     (push #'vector command-line-functions)
+     ;; In case EXWM is to be started from a graphical Emacs instance.
+     (add-hook 'window-setup-hook #'exwm-init t)
+     ;; In case EXWM is to be started with emacsclient.
+     (add-hook 'after-make-frame-functions #'exwm-init t)
+     ;; Manage the subordinate Emacs server.
+     (add-hook 'kill-emacs-hook #'exwm--server-stop)
+     (dolist (i exwm-blocking-subrs)
+       (advice-add i :around #'exwm--server-eval-at)))))
+
+(defun exwm--server-stop ()
+  "Stop the subordinate Emacs server."
+  (exwm--log)
+  (server-force-delete exwm--server-name)
+  (when exwm--server-process
+    (delete-process exwm--server-process)
+    (setq exwm--server-process nil)))
+
+(defun exwm--server-eval-at (&rest args)
+  "Wrapper of `server-eval-at' used to advice subrs."
+  ;; Start the subordinate Emacs server if it's not alive
+  (exwm--log "%s" args)
+  (unless (server-running-p exwm--server-name)
+    (when exwm--server-process (delete-process exwm--server-process))
+    (setq exwm--server-process
+          (start-process exwm--server-name
+                         nil
+                         (car command-line-args) ;The executable file
+                         "-d" (frame-parameter nil 'display)
+                         "-Q"
+                         (concat "--daemon=" exwm--server-name)
+                         "--eval"
+                         ;; Create an invisible frame
+                         "(make-frame '((window-system . x) (visibility)))"))
+    (while (not (server-running-p exwm--server-name))
+      (sit-for 0.001)))
+  (server-eval-at
+   exwm--server-name
+   `(progn (select-frame (car (frame-list)))
+           (let ((result ,(nconc (list (make-symbol (subr-name (car args))))
+                                 (cdr args))))
+             (pcase (type-of result)
+               ;; Return the name of a buffer
+               (`buffer (buffer-name result))
+               ;; We blindly convert all font objects to their XLFD names. This
+               ;; might cause problems of course, but it still has a chance to
+               ;; work (whereas directly passing font objects would merely
+               ;; raise errors).
+               ((or `font-entity `font-object `font-spec)
+                (font-xlfd-name result))
+               ;; Passing following types makes little sense
+               ((or `compiled-function `finalizer `frame `hash-table `marker
+                    `overlay `process `window `window-configuration))
+               ;; Passing the name of a subr
+               (`subr (make-symbol (subr-name result)))
+               ;; For other types, return the value as-is.
+               (t result))))))
+
+(defun exwm--confirm-kill-emacs (prompt &optional force)
+  "Confirm before exiting Emacs."
+  (exwm--log)
+  (when (cond
+         ((and force (not (eq force 'no-check)))
+          ;; Force killing Emacs.
+          t)
+         ((or (eq force 'no-check) (not exwm--id-buffer-alist))
+          ;; Check if there's any unsaved file.
+          (pcase (catch 'break
+                   (let ((kill-emacs-query-functions
+                          (append kill-emacs-query-functions
+                                  (list (lambda ()
+                                          (throw 'break 'break))))))
+                     (save-buffers-kill-emacs)))
+            (`break (y-or-n-p prompt))
+            (x x)))
+         (t
+          (yes-or-no-p (format "[EXWM] %d window(s) will be destroyed.  %s"
+                               (length exwm--id-buffer-alist) prompt))))
+    ;; Run `kill-emacs-hook' (`server-force-stop' excluded) before Emacs
+    ;; frames are unmapped so that errors (if any) can be visible.
+    (if (memq #'server-force-stop kill-emacs-hook)
+        (progn
+          (setq kill-emacs-hook (delq #'server-force-stop kill-emacs-hook))
+          (run-hooks 'kill-emacs-hook)
+          (setq kill-emacs-hook (list #'server-force-stop)))
+      (run-hooks 'kill-emacs-hook)
+      (setq kill-emacs-hook nil))
+    ;; Exit each module, destroying all resources created by this connection.
+    (exwm-exit)
+    ;; Set the return value.
+    t))
+
+
+
+(provide 'exwm)
+
+;;; exwm.el ends here