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;;; exwm-randr.el --- RandR Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2015-2018 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 module adds RandR support for EXWM. Currently it requires external
;; tools such as xrandr(1) to properly configure RandR first. This
;; dependency may be removed in the future, but more work is needed before
;; that.
;; To use this module, load, enable it and configure
;; `exwm-randr-workspace-output-plist' and `exwm-randr-screen-change-hook'
;; as follows:
;;
;; (require 'exwm-randr)
;; (setq exwm-randr-workspace-output-plist '(0 "VGA1"))
;; (add-hook 'exwm-randr-screen-change-hook
;; (lambda ()
;; (start-process-shell-command
;; "xrandr" nil "xrandr --output VGA1 --left-of LVDS1 --auto")))
;; (exwm-randr-enable)
;;
;; With above lines, workspace 0 should be assigned to the output named "VGA1",
;; staying at the left of other workspaces on the output "LVDS1". Please refer
;; to xrandr(1) for the configuration of RandR.
;; References:
;; + RandR (http://www.x.org/archive/X11R7.7/doc/randrproto/randrproto.txt)
;;; Code:
(require 'xcb-randr)
(require 'exwm-core)
(defvar exwm-randr-workspace-output-plist nil)
(defvar exwm-randr-refresh-hook nil
"Normal hook run when the RandR module just refreshed.")
(defvar exwm-workspace--fullscreen-frame-count)
(defvar exwm-workspace--list)
(declare-function exwm-workspace--count "exwm-workspace.el")
(declare-function exwm-workspace--set-fullscreen "exwm-workspace.el" (frame))
(declare-function exwm-workspace--update-workareas "exwm-workspace.el" ())
(declare-function exwm-workspace--show-minibuffer "exwm-workspace.el" ())
(declare-function exwm-workspace--set-desktop-geometry "exwm-workspace.el" ())
(defun exwm-randr--refresh ()
"Refresh workspaces according to the updated RandR info."
(let (output-name geometry output-plist default-geometry)
;; Query all outputs
(with-slots (config-timestamp outputs)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:GetScreenResources
:window exwm--root))
(dolist (output outputs)
(with-slots (crtc connection name)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:GetOutputInfo
:output output
:config-timestamp config-timestamp))
(setf output-name ;UTF-8 encoded
(decode-coding-string (apply #'unibyte-string name) 'utf-8))
(if (or (/= connection xcb:randr:Connection:Connected)
(= 0 crtc)) ;FIXME
(plist-put output-plist output-name nil)
(with-slots (x y width height)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:GetCrtcInfo
:crtc crtc
:config-timestamp config-timestamp))
(setq geometry (make-instance 'xcb:RECTANGLE
:x x :y y
:width width :height height)
output-plist (plist-put output-plist output-name geometry))
(unless default-geometry ;assume the first output as primary
(setq default-geometry geometry)))))))
(exwm--log "(randr) outputs: %s" output-plist)
(when output-plist
(when exwm-workspace--fullscreen-frame-count
;; Not all workspaces are fullscreen; reset this counter.
(setq exwm-workspace--fullscreen-frame-count 0))
(dotimes (i (exwm-workspace--count))
(let* ((output (plist-get exwm-randr-workspace-output-plist i))
(geometry (lax-plist-get output-plist output))
(frame (elt exwm-workspace--list i)))
(unless geometry
(setq geometry default-geometry
output nil))
(set-frame-parameter frame 'exwm-randr-output output)
(set-frame-parameter frame 'exwm-geometry geometry)))
;; Update workareas.
(exwm-workspace--update-workareas)
;; Resize workspace.
(dolist (f exwm-workspace--list)
(exwm-workspace--set-fullscreen f))
;; Raise the minibuffer if it's active.
(when (and (active-minibuffer-window)
(exwm-workspace--minibuffer-own-frame-p))
(exwm-workspace--show-minibuffer))
;; Set _NET_DESKTOP_GEOMETRY.
(exwm-workspace--set-desktop-geometry)
(xcb:flush exwm--connection)
(run-hooks 'exwm-randr-refresh-hook))))
(defvar exwm-randr-screen-change-hook nil
"Normal hook run when screen changes.")
(defun exwm-randr--init ()
"Initialize RandR extension and EXWM RandR module."
(if (= 0 (slot-value (xcb:get-extension-data exwm--connection 'xcb:randr)
'present))
(error "[EXWM] RandR extension is not supported by the server")
(with-slots (major-version minor-version)
(xcb:+request-unchecked+reply exwm--connection
(make-instance 'xcb:randr:QueryVersion
:major-version 1 :minor-version 2))
(if (or (/= major-version 1) (< minor-version 2))
(error "[EXWM] The server only support RandR version up to %d.%d"
major-version minor-version)
;; External monitor(s) may already be connected.
(run-hooks 'exwm-randr-screen-change-hook)
(exwm-randr--refresh)
(xcb:+event exwm--connection 'xcb:randr:ScreenChangeNotify
(lambda (_data _synthetic)
(exwm--log "(RandR) ScreenChangeNotify")
(run-hooks 'exwm-randr-screen-change-hook)
(exwm-randr--refresh)))
;; (xcb:+event exwm--connection 'xcb:randr:Notify
;; (lambda (_data _synthetic)
;; (exwm--log "(RandR) Notify")
;; (exwm-randr--refresh)))
(xcb:+request exwm--connection
(make-instance 'xcb:randr:SelectInput
:window exwm--root
:enable xcb:randr:NotifyMask:ScreenChange
;; :enable (eval-when-compile
;; (logior
;; xcb:randr:NotifyMask:ScreenChange
;; xcb:randr:NotifyMask:OutputChange
;; xcb:randr:NotifyMask:OutputProperty
;; xcb:randr:NotifyMask:CrtcChange))
))
(xcb:flush exwm--connection)
(add-hook 'exwm-workspace-list-change-hook #'exwm-randr--refresh))))
;; Prevent frame parameters introduced by this module from being
;; saved/restored.
(dolist (i '(exwm-randr-output))
(push (cons i :never) frameset-filter-alist)))
(defun exwm-randr--exit ()
"Exit the RandR module."
(remove-hook 'exwm-workspace-list-change-hook #'exwm-randr--refresh))
(defun exwm-randr-enable ()
"Enable RandR support for EXWM."
(add-hook 'exwm-init-hook #'exwm-randr--init)
(add-hook 'exwm-exit-hook #'exwm-randr--exit))
(provide 'exwm-randr)
;;; exwm-randr.el ends here
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