about summary refs log tree commit diff
path: root/exwm-workspace.el
blob: 8e3839f024a4698b4773594925e6392fd3fa052e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
;;; 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