chore(3p/exwm): Subtree EXWM ... again

Upstream EXWM is now sort-of unmaintained[0], but some important PRs
are pending[1] which I would like to absorb here somehow.

[0]: https://github.com/ch11ng/exwm/issues/845
[1]: https://github.com/ch11ng/exwm/pull/848

git-subtree-dir: third_party/exwm
git-subtree-mainline: 7894d7e178ac542f2542b71b10cb34e99080acd7
git-subtree-split: 0368127976bda29d35eed788edfe74644ecd3845
Change-Id: I078358c0ea1d2bac99111748ce9c137d2804ac4e

1 files changed, 805 insertions, 0 deletions

diff --git a/third_party/exwm/exwm-manage.el b/third_party/exwm/exwm-manage.el
new file mode 100644
index 000000000000..a7866f1ef885
--- /dev/null
+++ b/third_party/exwm/exwm-manage.el
@@ -0,0 +1,805 @@
+;;; exwm-manage.el --- Window Management Module for  -*- lexical-binding: t -*-
+;;;                    EXWM
+
+;; Copyright (C) 2015-2020 Free Software Foundation, Inc.
+
+;; Author: Chris Feng <chris.w.feng@gmail.com>
+
+;; 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:
+
+;; This is the fundamental module of EXWM that deals with window management.
+
+;;; Code:
+
+(require 'exwm-core)
+
+(defgroup exwm-manage nil
+  "Manage."
+  :version "25.3"
+  :group 'exwm)
+
+(defcustom exwm-manage-finish-hook nil
+  "Normal hook run after a window is just managed, in the context of the
+corresponding buffer."
+  :type 'hook)
+
+(defcustom exwm-manage-force-tiling nil
+  "Non-nil to force managing all X windows in tiling layout.
+You can still make the X windows floating afterwards."
+  :type 'boolean)
+
+(defcustom exwm-manage-ping-timeout 3
+  "Seconds to wait before killing a client."
+  :type 'integer)
+
+(defcustom exwm-manage-configurations nil
+  "Per-application configurations.
+
+Configuration options allow to override various default behaviors of EXWM
+and only take effect when they are present.  Note for certain options
+specifying nil is not exactly the same as leaving them out.  Currently
+possible choices:
+* floating: Force floating (non-nil) or tiling (nil) on startup.
+* x/y/width/height: Override the initial geometry (floating X window only).
+* border-width: Override the border width (only visible when floating).
+* fullscreen: Force full screen (non-nil) on startup.
+* floating-mode-line: `mode-line-format' used when floating.
+* tiling-mode-line: `mode-line-format' used when tiling.
+* floating-header-line: `header-line-format' used when floating.
+* tiling-header-line: `header-line-format' used when tiling.
+* char-mode: Force char-mode (non-nil) on startup.
+* prefix-keys: `exwm-input-prefix-keys' local to this X window.
+* simulation-keys: `exwm-input-simulation-keys' local to this X window.
+* workspace: The initial workspace.
+* managed: Force to manage (non-nil) or not manage (nil) the X window.
+
+For each X window managed for the first time, matching criteria (sexps) are
+evaluated sequentially and the first configuration with a non-nil matching
+criterion would be applied.  Apart from generic forms, one would typically
+want to match against EXWM internal variables such as `exwm-title',
+`exwm-class-name' and `exwm-instance-name'."
+  :type '(alist :key-type (sexp :tag "Matching criterion" nil)
+                :value-type
+                (plist :tag "Configurations"
+                       :options
+                       (((const :tag "Floating" floating) boolean)
+                        ((const :tag "X" x) number)
+                        ((const :tag "Y" y) number)
+                        ((const :tag "Width" width) number)
+                        ((const :tag "Height" height) number)
+                        ((const :tag "Border width" border-width) integer)
+                        ((const :tag "Fullscreen" fullscreen) boolean)
+                        ((const :tag "Floating mode-line" floating-mode-line)
+                         sexp)
+                        ((const :tag "Tiling mode-line" tiling-mode-line) sexp)
+                        ((const :tag "Floating header-line"
+                                floating-header-line)
+                         sexp)
+                        ((const :tag "Tiling header-line" tiling-header-line)
+                         sexp)
+                        ((const :tag "Char-mode" char-mode) boolean)
+                        ((const :tag "Prefix keys" prefix-keys)
+                         (repeat key-sequence))
+                        ((const :tag "Simulation keys" simulation-keys)
+                         (alist :key-type (key-sequence :tag "From")
+                                :value-type (key-sequence :tag "To")))
+                        ((const :tag "Workspace" workspace) integer)
+                        ((const :tag "Managed" managed) boolean)
+                        ;; For forward compatibility.
+                        ((other) sexp))))
+  ;; TODO: This is admittedly ugly.  We'd be better off with an event type.
+  :get (lambda (symbol)
+         (mapcar (lambda (pair)
+                   (let* ((match (car pair))
+                          (config (cdr pair))
+                          (prefix-keys (plist-get config 'prefix-keys)))
+                     (when prefix-keys
+                       (setq config (copy-tree config)
+                             config (plist-put config 'prefix-keys
+                                               (mapcar (lambda (i)
+                                                         (if (sequencep i)
+                                                             i
+                                                           (vector i)))
+                                                       prefix-keys))))
+                     (cons match config)))
+                 (default-value symbol)))
+  :set (lambda (symbol value)
+         (set symbol
+              (mapcar (lambda (pair)
+                        (let* ((match (car pair))
+                               (config (cdr pair))
+                               (prefix-keys (plist-get config 'prefix-keys)))
+                          (when prefix-keys
+                            (setq config (copy-tree config)
+                                  config (plist-put config 'prefix-keys
+                                                    (mapcar (lambda (i)
+                                                              (if (sequencep i)
+                                                                  (aref i 0)
+                                                                i))
+                                                            prefix-keys))))
+                          (cons match config)))
+                      value))))
+
+;; FIXME: Make the following values as small as possible.
+(defconst exwm-manage--height-delta-min 5)
+(defconst exwm-manage--width-delta-min 5)
+
+;; The _MOTIF_WM_HINTS atom (see <Xm/MwmUtil.h> for more details)
+;; It's currently only used in 'exwm-manage' module
+(defvar exwm-manage--_MOTIF_WM_HINTS nil "_MOTIF_WM_HINTS atom.")
+
+(defvar exwm-manage--desktop nil "The desktop X window.")
+
+(defvar exwm-manage--frame-outer-id-list nil
+  "List of window-outer-id's of all frames.")
+
+(defvar exwm-manage--ping-lock nil
+  "Non-nil indicates EXWM is pinging a window.")
+
+(defvar exwm-input--skip-buffer-list-update)
+(defvar exwm-input-prefix-keys)
+(defvar exwm-workspace--current)
+(defvar exwm-workspace--id-struts-alist)
+(defvar exwm-workspace--list)
+(defvar exwm-workspace--switch-history-outdated)
+(defvar exwm-workspace--workareas)
+(defvar exwm-workspace-current-index)
+(declare-function exwm--update-class "exwm.el" (id &optional force))
+(declare-function exwm--update-hints "exwm.el" (id &optional force))
+(declare-function exwm--update-normal-hints "exwm.el" (id &optional force))
+(declare-function exwm--update-protocols "exwm.el" (id &optional force))
+(declare-function exwm--update-struts "exwm.el" (id))
+(declare-function exwm--update-title "exwm.el" (id))
+(declare-function exwm--update-transient-for "exwm.el" (id &optional force))
+(declare-function exwm--update-desktop "exwm.el" (id &optional force))
+(declare-function exwm--update-window-type "exwm.el" (id &optional force))
+(declare-function exwm-floating--set-floating "exwm-floating.el" (id))
+(declare-function exwm-floating--unset-floating "exwm-floating.el" (id))
+(declare-function exwm-input-grab-keyboard "exwm-input.el")
+(declare-function exwm-input-set-local-simulation-keys "exwm-input.el")
+(declare-function exwm-layout--fullscreen-p "exwm-layout.el" ())
+(declare-function exwm-layout--iconic-state-p "exwm-layout.el" (&optional id))
+(declare-function exwm-workspace--position "exwm-workspace.el" (frame))
+(declare-function exwm-workspace--set-fullscreen "exwm-workspace.el" (frame))
+(declare-function exwm-workspace--update-struts "exwm-workspace.el" ())
+(declare-function exwm-workspace--update-workareas "exwm-workspace.el" ())
+
+(defun exwm-manage--update-geometry (id &optional force)
+  "Update window geometry."
+  (exwm--log "id=#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and exwm--geometry (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:GetGeometry :drawable id))))
+        (setq exwm--geometry
+              (or reply
+                  ;; Provide a reasonable fallback value.
+                  (make-instance 'xcb:RECTANGLE
+                                 :x 0
+                                 :y 0
+                                 :width (/ (x-display-pixel-width) 2)
+                                 :height (/ (x-display-pixel-height) 2))))))))
+
+(defun exwm-manage--update-ewmh-state (id)
+  "Update _NET_WM_STATE."
+  (exwm--log "id=#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless exwm--ewmh-state
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:ewmh:get-_NET_WM_STATE
+                                      :window id))))
+        (when reply
+          (setq exwm--ewmh-state (append (slot-value reply 'value) nil)))))))
+
+(defun exwm-manage--update-mwm-hints (id &optional force)
+  "Update _MOTIF_WM_HINTS."
+  (exwm--log "id=#x%x" id)
+  (with-current-buffer (exwm--id->buffer id)
+    (unless (and (not exwm--mwm-hints-decorations) (not force))
+      (let ((reply (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:icccm:-GetProperty
+                                      :window id
+                                      :property exwm-manage--_MOTIF_WM_HINTS
+                                      :type exwm-manage--_MOTIF_WM_HINTS
+                                      :long-length 5))))
+        (when reply
+          ;; Check MotifWmHints.decorations.
+          (with-slots (value) reply
+            (setq value (append value nil))
+            (when (and value
+                       ;; See <Xm/MwmUtil.h> for fields definitions.
+                       (/= 0 (logand
+                              (elt value 0) ;MotifWmHints.flags
+                              2))           ;MWM_HINTS_DECORATIONS
+                       (= 0
+                          (elt value 2))) ;MotifWmHints.decorations
+              (setq exwm--mwm-hints-decorations nil))))))))
+
+(defun exwm-manage--set-client-list ()
+  "Set _NET_CLIENT_LIST."
+  (exwm--log)
+  (xcb:+request exwm--connection
+      (make-instance 'xcb:ewmh:set-_NET_CLIENT_LIST
+                     :window exwm--root
+                     :data (vconcat (mapcar #'car exwm--id-buffer-alist)))))
+
+(cl-defun exwm-manage--get-configurations ()
+  "Retrieve configurations for this buffer."
+  (exwm--log)
+  (when (derived-mode-p 'exwm-mode)
+    (dolist (i exwm-manage-configurations)
+      (save-current-buffer
+        (when (with-demoted-errors "Problematic configuration: %S"
+                (eval (car i) t))
+          (cl-return-from exwm-manage--get-configurations (cdr i)))))))
+
+(defun exwm-manage--manage-window (id)
+  "Manage window ID."
+  (exwm--log "Try to manage #x%x" id)
+  (catch 'return
+    ;; Ensure it's alive
+    (when (xcb:+request-checked+request-check exwm--connection
+              (make-instance 'xcb:ChangeWindowAttributes
+                             :window id :value-mask xcb:CW:EventMask
+                             :event-mask (exwm--get-client-event-mask)))
+      (throw 'return 'dead))
+    ;; Add this X window to save-set.
+    (xcb:+request exwm--connection
+        (make-instance 'xcb:ChangeSaveSet
+                       :mode xcb:SetMode:Insert
+                       :window id))
+    (with-current-buffer (let ((exwm-input--skip-buffer-list-update t))
+                           (generate-new-buffer "*EXWM*"))
+      ;; Keep the oldest X window first.
+      (setq exwm--id-buffer-alist
+            (nconc exwm--id-buffer-alist `((,id . ,(current-buffer)))))
+      (exwm-mode)
+      (setq exwm--id id
+            exwm--frame exwm-workspace--current)
+      (exwm--update-window-type id)
+      (exwm--update-class id)
+      (exwm--update-transient-for id)
+      (exwm--update-normal-hints id)
+      (exwm--update-hints id)
+      (exwm-manage--update-geometry id)
+      (exwm-manage--update-mwm-hints id)
+      (exwm--update-title id)
+      (exwm--update-protocols id)
+      (setq exwm--configurations (exwm-manage--get-configurations))
+      ;; OverrideRedirect is not checked here.
+      (when (and
+             ;; The user has specified to manage it.
+             (not (plist-get exwm--configurations 'managed))
+             (or
+              ;; The user has specified not to manage it.
+              (plist-member exwm--configurations 'managed)
+              ;; This is not a type of X window we can manage.
+              (and exwm-window-type
+                   (not (cl-intersection
+                         exwm-window-type
+                         (list xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY
+                               xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG
+                               xcb:Atom:_NET_WM_WINDOW_TYPE_NORMAL))))
+              ;; Check the _MOTIF_WM_HINTS property to not manage floating X
+              ;; windows without decoration.
+              (and (not exwm--mwm-hints-decorations)
+                   (not exwm--hints-input)
+                   ;; Floating windows only
+                   (or exwm-transient-for exwm--fixed-size
+                       (memq xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY
+                             exwm-window-type)
+                       (memq xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG
+                             exwm-window-type)))))
+        (exwm--log "No need to manage #x%x" id)
+        ;; Update struts.
+        (when (memq xcb:Atom:_NET_WM_WINDOW_TYPE_DOCK exwm-window-type)
+          (exwm--update-struts id))
+        ;; Remove all events
+        (xcb:+request exwm--connection
+            (make-instance 'xcb:ChangeWindowAttributes
+                           :window id :value-mask xcb:CW:EventMask
+                           :event-mask
+                           (if (memq xcb:Atom:_NET_WM_WINDOW_TYPE_DOCK
+                                     exwm-window-type)
+                               ;; Listen for PropertyChange (struts) and
+                               ;; UnmapNotify/DestroyNotify event of the dock.
+                               (exwm--get-client-event-mask)
+                             xcb:EventMask:NoEvent)))
+        ;; The window needs to be mapped
+        (xcb:+request exwm--connection
+            (make-instance 'xcb:MapWindow :window id))
+        (with-slots (x y width height) exwm--geometry
+          ;; Center window of type _NET_WM_WINDOW_TYPE_SPLASH
+          (when (memq xcb:Atom:_NET_WM_WINDOW_TYPE_SPLASH exwm-window-type)
+            (let* ((workarea (elt exwm-workspace--workareas
+                                  (exwm-workspace--position exwm--frame)))
+                   (x* (aref workarea 0))
+                   (y* (aref workarea 1))
+                   (width* (aref workarea 2))
+                   (height* (aref workarea 3)))
+              (exwm--set-geometry id
+                                  (+ x* (/ (- width* width) 2))
+                                  (+ y* (/ (- height* height) 2))
+                                  nil
+                                  nil))))
+        ;; Check for desktop.
+        (when (memq xcb:Atom:_NET_WM_WINDOW_TYPE_DESKTOP exwm-window-type)
+          ;; There should be only one desktop X window.
+          (setq exwm-manage--desktop id)
+          ;; Put it at bottom.
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:ConfigureWindow
+                             :window id
+                             :value-mask xcb:ConfigWindow:StackMode
+                             :stack-mode xcb:StackMode:Below)))
+        (xcb:flush exwm--connection)
+        (setq exwm--id-buffer-alist (assq-delete-all id exwm--id-buffer-alist))
+        (let ((kill-buffer-query-functions nil)
+              (exwm-input--skip-buffer-list-update t))
+          (kill-buffer (current-buffer)))
+        (throw 'return 'ignored))
+      (let ((index (plist-get exwm--configurations 'workspace)))
+        (when (and index (< index (length exwm-workspace--list)))
+          (setq exwm--frame (elt exwm-workspace--list index))))
+      ;; Manage the window
+      (exwm--log "Manage #x%x" id)
+      (xcb:+request exwm--connection    ;remove border
+          (make-instance 'xcb:ConfigureWindow
+                         :window id :value-mask xcb:ConfigWindow:BorderWidth
+                         :border-width 0))
+      (dolist (button       ;grab buttons to set focus / move / resize
+               (list xcb:ButtonIndex:1 xcb:ButtonIndex:2 xcb:ButtonIndex:3))
+        (xcb:+request exwm--connection
+            (make-instance 'xcb:GrabButton
+                           :owner-events 0 :grab-window id
+                           :event-mask xcb:EventMask:ButtonPress
+                           :pointer-mode xcb:GrabMode:Sync
+                           :keyboard-mode xcb:GrabMode:Async
+                           :confine-to xcb:Window:None :cursor xcb:Cursor:None
+                           :button button :modifiers xcb:ModMask:Any)))
+      (exwm-manage--set-client-list)
+      (xcb:flush exwm--connection)
+      (if (plist-member exwm--configurations 'floating)
+          ;; User has specified whether it should be floating.
+          (if (plist-get exwm--configurations 'floating)
+              (exwm-floating--set-floating id)
+            (with-selected-window (frame-selected-window exwm--frame)
+              (exwm-floating--unset-floating id)))
+        ;; Try to determine if it should be floating.
+        (if (and (not exwm-manage-force-tiling)
+                 (or exwm-transient-for exwm--fixed-size
+                     (memq xcb:Atom:_NET_WM_WINDOW_TYPE_UTILITY
+                           exwm-window-type)
+                     (memq xcb:Atom:_NET_WM_WINDOW_TYPE_DIALOG
+                           exwm-window-type)))
+            (exwm-floating--set-floating id)
+          (with-selected-window (frame-selected-window exwm--frame)
+            (exwm-floating--unset-floating id))))
+      (if (plist-get exwm--configurations 'char-mode)
+          (exwm-input-release-keyboard id)
+        (exwm-input-grab-keyboard id))
+      (let ((simulation-keys (plist-get exwm--configurations 'simulation-keys))
+            (prefix-keys (plist-get exwm--configurations 'prefix-keys)))
+        (with-current-buffer (exwm--id->buffer id)
+          (when simulation-keys
+            (exwm-input-set-local-simulation-keys simulation-keys))
+          (when prefix-keys
+            (setq-local exwm-input-prefix-keys prefix-keys))))
+      (setq exwm-workspace--switch-history-outdated t)
+      (exwm--update-desktop id)
+      (exwm-manage--update-ewmh-state id)
+      (with-current-buffer (exwm--id->buffer id)
+        (when (or (plist-get exwm--configurations 'fullscreen)
+                  (exwm-layout--fullscreen-p))
+          (setq exwm--ewmh-state (delq xcb:Atom:_NET_WM_STATE_FULLSCREEN
+                                       exwm--ewmh-state))
+          (exwm-layout-set-fullscreen id))
+        (run-hooks 'exwm-manage-finish-hook)))))
+
+(defun exwm-manage--unmanage-window (id &optional withdraw-only)
+  "Unmanage window ID.
+
+If WITHDRAW-ONLY is non-nil, the X window will be properly placed back to the
+root window.  Set WITHDRAW-ONLY to 'quit if this functions is used when window
+manager is shutting down."
+  (let ((buffer (exwm--id->buffer id)))
+    (exwm--log "Unmanage #x%x (buffer: %s, widthdraw: %s)"
+               id buffer withdraw-only)
+    (setq exwm--id-buffer-alist (assq-delete-all id exwm--id-buffer-alist))
+    ;; Update workspaces when a dock is destroyed.
+    (when (and (null withdraw-only)
+               (assq id exwm-workspace--id-struts-alist))
+      (setq exwm-workspace--id-struts-alist
+            (assq-delete-all id exwm-workspace--id-struts-alist))
+      (exwm-workspace--update-struts)
+      (exwm-workspace--update-workareas)
+      (dolist (f exwm-workspace--list)
+        (exwm-workspace--set-fullscreen f)))
+    (when (buffer-live-p buffer)
+      (with-current-buffer buffer
+        ;; Unmap the X window.
+        (xcb:+request exwm--connection
+            (make-instance 'xcb:UnmapWindow :window id))
+        ;;
+        (setq exwm-workspace--switch-history-outdated t)
+        ;;
+        (when withdraw-only
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:ChangeWindowAttributes
+                             :window id :value-mask xcb:CW:EventMask
+                             :event-mask xcb:EventMask:NoEvent))
+          ;; Delete WM_STATE property
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:DeleteProperty
+                             :window id :property xcb:Atom:WM_STATE))
+          (cond
+           ((eq withdraw-only 'quit)
+            ;; Remap the window when exiting.
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:MapWindow :window id)))
+           (t
+            ;; Remove _NET_WM_DESKTOP.
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:DeleteProperty
+                               :window id
+                               :property xcb:Atom:_NET_WM_DESKTOP)))))
+        (when exwm--floating-frame
+          ;; Unmap the floating frame before destroying its container.
+          (let ((window (frame-parameter exwm--floating-frame 'exwm-outer-id))
+                (container (frame-parameter exwm--floating-frame
+                                            'exwm-container)))
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:UnmapWindow :window window))
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:ReparentWindow
+                               :window window :parent exwm--root :x 0 :y 0))
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:DestroyWindow :window container))))
+        (when (exwm-layout--fullscreen-p)
+          (let ((window (get-buffer-window)))
+            (when window
+              (set-window-dedicated-p window nil))))
+        (exwm-manage--set-client-list)
+        (xcb:flush exwm--connection))
+      (let ((kill-buffer-func
+             (lambda (buffer)
+               (when (buffer-local-value 'exwm--floating-frame buffer)
+                 (select-window
+                  (frame-selected-window exwm-workspace--current)))
+               (with-current-buffer buffer
+                 (let ((kill-buffer-query-functions nil))
+                   (kill-buffer buffer))))))
+        (exwm--defer 0 kill-buffer-func buffer)
+        (when (active-minibuffer-window)
+          (exit-minibuffer))))))
+
+(defun exwm-manage--scan ()
+  "Search for existing windows and try to manage them."
+  (exwm--log)
+  (let* ((tree (xcb:+request-unchecked+reply exwm--connection
+                   (make-instance 'xcb:QueryTree
+                                  :window exwm--root)))
+         reply)
+    (dolist (i (slot-value tree 'children))
+      (setq reply (xcb:+request-unchecked+reply exwm--connection
+                      (make-instance 'xcb:GetWindowAttributes
+                                     :window i)))
+      ;; It's possible the X window has been destroyed.
+      (when reply
+        (with-slots (override-redirect map-state) reply
+          (when (and (= 0 override-redirect)
+                     (= xcb:MapState:Viewable map-state))
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:UnmapWindow
+                               :window i))
+            (xcb:flush exwm--connection)
+            (exwm-manage--manage-window i)))))))
+
+(defun exwm-manage--kill-buffer-query-function ()
+  "Run in `kill-buffer-query-functions'."
+  (exwm--log "id=#x%x; buffer=%s" exwm--id (current-buffer))
+  (catch 'return
+    (when (or (not exwm--id)
+              (xcb:+request-checked+request-check exwm--connection
+                  (make-instance 'xcb:ChangeWindowAttributes
+                                 :window exwm--id
+                                 :value-mask xcb:CW:EventMask
+                                 :event-mask (exwm--get-client-event-mask))))
+      ;; The X window is no longer alive so just close the buffer.
+      (when exwm--floating-frame
+        (let ((window (frame-parameter exwm--floating-frame 'exwm-outer-id))
+              (container (frame-parameter exwm--floating-frame
+                                          'exwm-container)))
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:UnmapWindow :window window))
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:ReparentWindow
+                             :window window
+                             :parent exwm--root
+                             :x 0 :y 0))
+          (xcb:+request exwm--connection
+              (make-instance 'xcb:DestroyWindow
+                             :window container))))
+      (xcb:flush exwm--connection)
+      (throw 'return t))
+    (unless (memq xcb:Atom:WM_DELETE_WINDOW exwm--protocols)
+      ;; The X window does not support WM_DELETE_WINDOW; destroy it.
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:DestroyWindow :window exwm--id))
+      (xcb:flush exwm--connection)
+      ;; Wait for DestroyNotify event.
+      (throw 'return nil))
+    (let ((id exwm--id))
+      ;; Try to close the X window with WM_DELETE_WINDOW client message.
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:icccm:SendEvent
+                         :destination id
+                         :event (xcb:marshal
+                                 (make-instance 'xcb:icccm:WM_DELETE_WINDOW
+                                                :window id)
+                                 exwm--connection)))
+      (xcb:flush exwm--connection)
+      ;;
+      (unless (memq xcb:Atom:_NET_WM_PING exwm--protocols)
+        ;; For X windows without _NET_WM_PING support, we'd better just
+        ;; wait for DestroyNotify events.
+        (throw 'return nil))
+      ;; Try to determine if the X window is dead with _NET_WM_PING.
+      (setq exwm-manage--ping-lock t)
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:SendEvent
+                         :propagate 0
+                         :destination id
+                         :event-mask xcb:EventMask:NoEvent
+                         :event (xcb:marshal
+                                 (make-instance 'xcb:ewmh:_NET_WM_PING
+                                                :window id
+                                                :timestamp 0
+                                                :client-window id)
+                                 exwm--connection)))
+      (xcb:flush exwm--connection)
+      (with-timeout (exwm-manage-ping-timeout
+                     (if (y-or-n-p (format "'%s' is not responding.  \
+Would you like to kill it? "
+                                              (buffer-name)))
+                         (progn (exwm-manage--kill-client id)
+                                ;; Kill the unresponsive X window and
+                                ;; wait for DestroyNotify event.
+                                (throw 'return nil))
+                       ;; Give up.
+                       (throw 'return nil)))
+        (while (and exwm-manage--ping-lock
+                    (exwm--id->buffer id)) ;may have been destroyed.
+          (accept-process-output nil 0.1))
+        ;; Give up.
+        (throw 'return nil)))))
+
+(defun exwm-manage--kill-client (&optional id)
+  "Kill an X client."
+  (unless id (setq id (exwm--buffer->id (current-buffer))))
+  (exwm--log "id=#x%x" id)
+  (let* ((response (xcb:+request-unchecked+reply exwm--connection
+                       (make-instance 'xcb:ewmh:get-_NET_WM_PID :window id)))
+         (pid (and response (slot-value response 'value)))
+         (request (make-instance 'xcb:KillClient :resource id)))
+    (if (not pid)
+        (xcb:+request exwm--connection request)
+      ;; What if the PID is fake/wrong?
+      (signal-process pid 'SIGKILL)
+      ;; Ensure it's dead
+      (run-with-timer exwm-manage-ping-timeout nil
+                      (lambda ()
+                        (xcb:+request exwm--connection request))))
+    (xcb:flush exwm--connection)))
+
+(defun exwm-manage--add-frame (frame)
+  "Run in `after-make-frame-functions'."
+  (exwm--log "frame=%s" frame)
+  (when (display-graphic-p frame)
+    (push (string-to-number (frame-parameter frame 'outer-window-id))
+          exwm-manage--frame-outer-id-list)))
+
+(defun exwm-manage--remove-frame (frame)
+  "Run in `delete-frame-functions'."
+  (exwm--log "frame=%s" frame)
+  (when (display-graphic-p frame)
+    (setq exwm-manage--frame-outer-id-list
+          (delq (string-to-number (frame-parameter frame 'outer-window-id))
+                exwm-manage--frame-outer-id-list))))
+
+(defun exwm-manage--on-ConfigureRequest (data _synthetic)
+  "Handle ConfigureRequest event."
+  (exwm--log)
+  (let ((obj (make-instance 'xcb:ConfigureRequest))
+        buffer edges width-delta height-delta)
+    (xcb:unmarshal obj data)
+    (with-slots (window x y width height
+                        border-width sibling stack-mode value-mask)
+        obj
+      (exwm--log "#x%x (#x%x) @%dx%d%+d%+d; \
+border-width: %d; sibling: #x%x; stack-mode: %d"
+                 window value-mask width height x y
+                 border-width sibling stack-mode)
+      (if (and (setq buffer (exwm--id->buffer window))
+               (with-current-buffer buffer
+                 (or (exwm-layout--fullscreen-p)
+                     ;; Make sure it's a floating X window wanting to resize
+                     ;; itself.
+                     (or (not exwm--floating-frame)
+                         (progn
+                           (setq edges
+                                 (window-inside-pixel-edges
+                                  (get-buffer-window buffer t))
+                                 width-delta (- width (- (elt edges 2)
+                                                         (elt edges 0)))
+                                 height-delta (- height (- (elt edges 3)
+                                                           (elt edges 1))))
+                           ;; We cannot do resizing precisely for now.
+                           (and (if (= 0 (logand value-mask
+                                                 xcb:ConfigWindow:Width))
+                                    t
+                                  (< (abs width-delta)
+                                     exwm-manage--width-delta-min))
+                                (if (= 0 (logand value-mask
+                                                 xcb:ConfigWindow:Height))
+                                    t
+                                  (< (abs height-delta)
+                                     exwm-manage--height-delta-min))))))))
+          ;; Send client message for managed windows
+          (with-current-buffer buffer
+            (setq edges
+                  (if (exwm-layout--fullscreen-p)
+                      (with-slots (x y width height)
+                          (exwm-workspace--get-geometry exwm--frame)
+                        (list x y width height))
+                    (window-inside-absolute-pixel-edges
+                     (get-buffer-window buffer t))))
+            (exwm--log "Reply with ConfigureNotify (edges): %s" edges)
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:SendEvent
+                               :propagate 0 :destination window
+                               :event-mask xcb:EventMask:StructureNotify
+                               :event (xcb:marshal
+                                       (make-instance
+                                        'xcb:ConfigureNotify
+                                        :event window :window window
+                                        :above-sibling xcb:Window:None
+                                        :x (elt edges 0) :y (elt edges 1)
+                                        :width (- (elt edges 2) (elt edges 0))
+                                        :height (- (elt edges 3) (elt edges 1))
+                                        :border-width 0 :override-redirect 0)
+                                       exwm--connection))))
+        (if buffer
+            (with-current-buffer buffer
+              (exwm--log "ConfigureWindow (resize floating X window)")
+              (exwm--set-geometry (frame-parameter exwm--floating-frame
+                                                   'exwm-outer-id)
+                                  nil
+                                  nil
+                                  (+ (frame-pixel-width exwm--floating-frame)
+                                     width-delta)
+                                  (+ (frame-pixel-height exwm--floating-frame)
+                                     height-delta)))
+          (exwm--log "ConfigureWindow (preserve geometry)")
+          ;; Configure the unmanaged window.
+          ;; But Emacs frames should be excluded.  Generally we don't
+          ;; receive ConfigureRequest events from Emacs frames since we
+          ;; have set OverrideRedirect on them, but this is not true for
+          ;; Lucid build (as of 25.1).
+          (unless (memq window exwm-manage--frame-outer-id-list)
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:ConfigureWindow
+                               :window window
+                               :value-mask value-mask
+                               :x x :y y :width width :height height
+                               :border-width border-width
+                               :sibling sibling
+                               :stack-mode stack-mode)))))))
+  (xcb:flush exwm--connection))
+
+(defun exwm-manage--on-MapRequest (data _synthetic)
+  "Handle MapRequest event."
+  (let ((obj (make-instance 'xcb:MapRequest)))
+    (xcb:unmarshal obj data)
+    (with-slots (parent window) obj
+      (exwm--log "id=#x%x parent=#x%x" window parent)
+      (if (assoc window exwm--id-buffer-alist)
+          (with-current-buffer (exwm--id->buffer window)
+            (if (exwm-layout--iconic-state-p)
+                ;; State change: iconic => normal.
+                (when (eq exwm--frame exwm-workspace--current)
+                  (pop-to-buffer-same-window (current-buffer)))
+              (exwm--log "#x%x is already managed" window)))
+        (if (/= exwm--root parent)
+            (progn (xcb:+request exwm--connection
+                       (make-instance 'xcb:MapWindow :window window))
+                   (xcb:flush exwm--connection))
+          (exwm--log "#x%x" window)
+          (exwm-manage--manage-window window))))))
+
+(defun exwm-manage--on-UnmapNotify (data _synthetic)
+  "Handle UnmapNotify event."
+  (let ((obj (make-instance 'xcb:UnmapNotify)))
+    (xcb:unmarshal obj data)
+    (with-slots (window) obj
+      (exwm--log "id=#x%x" window)
+      (exwm-manage--unmanage-window window t))))
+
+(defun exwm-manage--on-MapNotify (data _synthetic)
+  "Handle MapNotify event."
+  (let ((obj (make-instance 'xcb:MapNotify)))
+    (xcb:unmarshal obj data)
+    (with-slots (window) obj
+      (when (assoc window exwm--id-buffer-alist)
+        (exwm--log "id=#x%x" window)
+        ;; With this we ensure that a "window hierarchy change" happens after
+        ;; mapping the window, as some servers (XQuartz) do not generate it.
+        (with-current-buffer (exwm--id->buffer window)
+          (if exwm--floating-frame
+              (xcb:+request exwm--connection
+                  (make-instance 'xcb:ConfigureWindow
+                                 :window window
+                                 :value-mask xcb:ConfigWindow:StackMode
+                                 :stack-mode xcb:StackMode:Above))
+            (xcb:+request exwm--connection
+                (make-instance 'xcb:ConfigureWindow
+                               :window window
+                               :value-mask (logior xcb:ConfigWindow:Sibling
+                                                   xcb:ConfigWindow:StackMode)
+                               :sibling exwm--guide-window
+                               :stack-mode xcb:StackMode:Above))))
+        (xcb:flush exwm--connection)))))
+
+(defun exwm-manage--on-DestroyNotify (data synthetic)
+  "Handle DestroyNotify event."
+  (unless synthetic
+    (exwm--log)
+    (let ((obj (make-instance 'xcb:DestroyNotify)))
+      (xcb:unmarshal obj data)
+      (exwm--log "#x%x" (slot-value obj 'window))
+      (exwm-manage--unmanage-window (slot-value obj 'window)))))
+
+(defun exwm-manage--init ()
+  "Initialize manage module."
+  ;; Intern _MOTIF_WM_HINTS
+  (exwm--log)
+  (setq exwm-manage--_MOTIF_WM_HINTS (exwm--intern-atom "_MOTIF_WM_HINTS"))
+  (add-hook 'after-make-frame-functions #'exwm-manage--add-frame)
+  (add-hook 'delete-frame-functions #'exwm-manage--remove-frame)
+  (xcb:+event exwm--connection 'xcb:ConfigureRequest
+              #'exwm-manage--on-ConfigureRequest)
+  (xcb:+event exwm--connection 'xcb:MapRequest #'exwm-manage--on-MapRequest)
+  (xcb:+event exwm--connection 'xcb:UnmapNotify #'exwm-manage--on-UnmapNotify)
+  (xcb:+event exwm--connection 'xcb:MapNotify #'exwm-manage--on-MapNotify)
+  (xcb:+event exwm--connection 'xcb:DestroyNotify
+              #'exwm-manage--on-DestroyNotify))
+
+(defun exwm-manage--exit ()
+  "Exit the manage module."
+  (exwm--log)
+  (dolist (pair exwm--id-buffer-alist)
+    (exwm-manage--unmanage-window (car pair) 'quit))
+  (remove-hook 'after-make-frame-functions #'exwm-manage--add-frame)
+  (remove-hook 'delete-frame-functions #'exwm-manage--remove-frame)
+  (setq exwm-manage--_MOTIF_WM_HINTS nil))
+
+
+
+(provide 'exwm-manage)
+
+;;; exwm-manage.el ends here