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;;; exwm-workspace.el --- Workspace Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2015 Chris Feng
;; Author: Chris Feng <chris.w.feng@gmail.com>
;; Keywords: unix
;; This file is not part of GNU Emacs.
;; This file 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 file 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 file. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This module adds workspace support for EXWM.
;; Todo:
;; + prevent from deleting frames of Emacs client (`frame-delete-functions')
;;; Code:
(defvar exwm-workspace-number 4 "Number of workspaces (1 ~ 10).")
(defvar exwm-workspace--list nil "List of all workspaces (Emacs frames).")
(defvar exwm-workspace--switch-map
(let ((map (make-sparse-keymap)))
(define-key map [t] (lambda () (interactive)))
(dotimes (i 10)
(define-key map (int-to-string i)
`(lambda ()
(interactive)
(when (< ,i exwm-workspace-number)
(goto-history-element ,(1+ i))
(exit-minibuffer)))))
(define-key map "\C-a" (lambda () (interactive) (goto-history-element 1)))
(define-key map "\C-e" (lambda ()
(interactive)
(goto-history-element exwm-workspace-number)))
(define-key map "\C-g" 'abort-recursive-edit)
(define-key map "\C-]" 'abort-recursive-edit)
(define-key map "\C-j" 'exit-minibuffer)
;; (define-key map "\C-m" 'exit-minibuffer) ;not working
(define-key map [return] 'exit-minibuffer)
(define-key map " " 'exit-minibuffer)
(define-key map "\C-f" 'previous-history-element)
(define-key map "\C-b" 'next-history-element)
;; Alternative keys
(define-key map [right] 'previous-history-element)
(define-key map [left] 'next-history-element)
map)
"Keymap used for interactively switch workspace.")
(defvar exwm-workspace--switch-history nil
"History for `read-from-minibuffer' to interactively switch workspace.")
(defun exwm-workspace--update-switch-history ()
"Update the history for switching workspace to reflect the latest status."
(let ((sequence (number-sequence 0 (1- exwm-workspace-number)))
(not-empty (make-vector exwm-workspace-number nil)))
(dolist (i exwm--id-buffer-alist)
(with-current-buffer (cdr i)
(when exwm--frame
(setf (elt not-empty (cl-position exwm--frame exwm-workspace--list))
t))))
(setq exwm-workspace--switch-history
(mapcar
(lambda (i)
(mapconcat
(lambda (j)
(format (if (= i j) "[%s]" " %s ")
(propertize
(int-to-string j)
'face
(cond ((frame-parameter (elt exwm-workspace--list j)
'exwm--urgency)
'(:foreground "orange"))
((elt not-empty j) '(:foreground "green"))
(t nil)))))
sequence ""))
sequence))))
(defvar exwm-workspace--current nil "Current active workspace.")
(defvar exwm-workspace-current-index 0 "Index of current active workspace.")
(defun exwm-workspace-switch (index &optional force)
"Switch to workspace INDEX. Query for INDEX if it's not specified.
The optional FORCE option is for internal use only."
(interactive
(list
(unless (and (eq major-mode 'exwm-mode) exwm--fullscreen) ;it's invisible
(let* ((history-add-new-input nil) ;prevent modifying history
(idx (read-from-minibuffer
"Workspace: " (elt exwm-workspace--switch-history
exwm-workspace-current-index)
exwm-workspace--switch-map nil
`(exwm-workspace--switch-history
. ,(1+ exwm-workspace-current-index)))))
(cl-position idx exwm-workspace--switch-history :test 'equal)))))
(when index
(unless (and (<= 0 index) (< index exwm-workspace-number))
(user-error "[EXWM] Workspace index out of range: %d" index))
(when (or force (/= exwm-workspace-current-index index))
(let ((frame (elt exwm-workspace--list index)))
(setq exwm-workspace--current frame
exwm-workspace-current-index index)
(select-frame-set-input-focus frame)
;; Move mouse when necessary
(let ((position (mouse-pixel-position))
x y w h)
(unless (eq frame (car position))
(setq x (cadr position)
y (cddr position)
w (frame-pixel-width frame)
h (frame-pixel-height frame))
(when (or (> x w) (> y h))
(setq x (/ w 2)
y (/ h 2)))
(set-mouse-pixel-position frame x y)))
(setq default-minibuffer-frame frame)
;; Hide windows in other workspaces by preprending a space
(dolist (i exwm--id-buffer-alist)
(with-current-buffer (cdr i)
(let ((name (replace-regexp-in-string "^\\s-*" "" (buffer-name))))
(exwm-workspace-rename-buffer (if (eq frame exwm--frame)
name
(concat " " name))))))
;; Update demands attention flag
(set-frame-parameter frame 'exwm--urgency nil)
;; Update switch workspace history
(exwm-workspace--update-switch-history)
(exwm--make-emacs-idle-for 0.1) ;FIXME
;; Update _NET_CURRENT_DESKTOP
(xcb:+request exwm--connection
(make-instance 'xcb:ewmh:set-_NET_CURRENT_DESKTOP
:window exwm--root :data index))
(xcb:flush exwm--connection)))))
(defun exwm-workspace--on-focus-in ()
"Fix unexpected frame switch."
(let ((index (cl-position (selected-frame) exwm-workspace--list)))
(exwm--log "Focus on workspace %s" index)
(when (and index (/= index exwm-workspace-current-index))
(exwm--log "Workspace was switched unexpectedly")
(exwm-workspace-switch index))))
(defun exwm-workspace-move-window (index &optional id)
"Move window ID to workspace INDEX."
(interactive
(list
(let* ((history-add-new-input nil) ;prevent modifying history
(idx (read-from-minibuffer
"Workspace: " (elt exwm-workspace--switch-history
exwm-workspace-current-index)
exwm-workspace--switch-map nil
`(exwm-workspace--switch-history
. ,(1+ exwm-workspace-current-index)))))
(cl-position idx exwm-workspace--switch-history :test 'equal))))
(unless id (setq id (exwm--buffer->id (window-buffer))))
(unless (and (<= 0 index) (< index exwm-workspace-number))
(user-error "[EXWM] Workspace index out of range: %d" index))
(with-current-buffer (exwm--id->buffer id)
(let ((frame (elt exwm-workspace--list index)))
(when (not (equal exwm--frame frame))
(let ((name (replace-regexp-in-string "^\\s-*" "" (buffer-name))))
(exwm-workspace-rename-buffer (if (= index exwm-workspace-current-index)
name
(concat " " name))))
(setq exwm--frame frame)
(if exwm--floating-frame
;; Move the floating frame is enough
(progn
(xcb:+request exwm--connection
(make-instance 'xcb:ReparentWindow
:window (frame-parameter exwm--floating-frame
'exwm-outer-id)
:parent (frame-parameter frame
'exwm-window-id)
:x 0 :y 0))
(xcb:flush exwm--connection))
;; Move the window itself
(bury-buffer)
(exwm-layout--hide id)
(xcb:+request exwm--connection
(make-instance 'xcb:ReparentWindow
:window id
:parent (frame-parameter frame 'exwm-window-id)
:x 0 :y 0))
(xcb:flush exwm--connection)
(set-window-buffer (frame-first-window frame)
(exwm--id->buffer id)))))
(exwm-workspace--update-switch-history)))
(defun exwm-workspace-rename-buffer (newname)
"Rename a buffer."
(if (/= ?\s (aref newname 0))
(rename-buffer newname t)
;; If a buffer name is prefixed with a space, Emacs append a random
;; number before renaming it. This is not desired behavior.
(let ((name (replace-regexp-in-string "<[0-9]+>$" "" newname))
(counter 1))
(while (and (get-buffer newname)
(not (eq (get-buffer newname) (current-buffer))))
(setq newname (format "%s<%d>" name (cl-incf counter)))))
(rename-buffer newname)))
(defun exwm-workspace--init ()
"Initialize workspace module."
(cl-assert (and (< 0 exwm-workspace-number) (>= 10 exwm-workspace-number)))
;; Prevent unexpected exit
(setq confirm-kill-emacs
(lambda (prompt)
(pcase (length exwm--id-buffer-alist)
(0 (y-or-n-p prompt))
(x (yes-or-no-p (format "[EXWM] %d window%s currently alive. %s"
x (if (= x 1) "" "s") prompt))))))
;; Initialize workspaces
(setq exwm-workspace--list (frame-list))
(when (< 1 (length exwm-workspace--list))
;; Emacs client creates an extra (but unusable) frame
(dolist (i exwm-workspace--list)
(unless (frame-parameter i 'window-id)
(setq exwm-workspace--list (delq i exwm-workspace--list)))))
(cl-assert (= 1 (length exwm-workspace--list)))
;; Create remaining frames
(dotimes (i (1- exwm-workspace-number))
(nconc exwm-workspace--list
(list (make-frame '((window-system . x)
(visibility . nil))))))
;; Configure workspaces
(dolist (i exwm-workspace--list)
(let ((window-id (string-to-int (frame-parameter i 'window-id)))
(outer-id (string-to-int (frame-parameter i 'outer-window-id))))
;; Save window IDs
(set-frame-parameter i 'exwm-window-id window-id)
(set-frame-parameter i 'exwm-outer-id outer-id)
;; Set OverrideRedirect on all frames
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window outer-id :value-mask xcb:CW:OverrideRedirect
:override-redirect 1))
;; Select events on all virtual roots
(xcb:+request exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window window-id :value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:SubstructureRedirect))))
(xcb:flush exwm--connection)
;; We have to delay making the frame visible until the
;; override-redirect flag has been set.
(select-frame-set-input-focus (car exwm-workspace--list))
(dolist (i exwm-workspace--list)
(set-frame-parameter i 'visibility t)
(lower-frame i)
(set-frame-parameter i 'fullscreen 'fullboth))
(raise-frame (car exwm-workspace--list))
;; Handle unexpected frame switch
(add-hook 'focus-in-hook 'exwm-workspace--on-focus-in)
;; Switch to the first workspace
(exwm-workspace-switch 0 t))
(provide 'exwm-workspace)
;;; exwm-workspace.el ends here
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