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
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
|
;;; exwm-xsettings.el --- XSETTINGS Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2022-2024 Free Software Foundation, Inc.
;; Author: Steven Allen <steven@stebalien.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:
;; Implements the XSETTINGS protocol, allowing Emacs to manage the system theme,
;; fonts, icons, etc.
;;
;; This package can be configured as follows:
;;
;; (require 'exwm-xsettings)
;; (setq exwm-xsettings-theme '("Adwaita" . "Adwaita-dark") ;; light/dark
;; exwm-xsettings `(("Xft/HintStyle" . "hintslight")
;; ("Xft/RGBA" . "rgb")
;; ("Xft/lcdfilter" . "lcddefault")
;; ("Xft/Antialias" . 1)
;; ;; DPI is in 1024ths of an inch, so this is a DPI of
;; ;; 144, equivalent to ;; a scaling factor of 1.5
;; ;; (144 = 1.5 * 96).
;; ("Xft/DPI" . ,(* 144 1024))
;; ("Xft/Hinting" . 1)))
;; (exwm-xsettings-enable)
;;
;; To modify these settings at runtime, customize them with
;; `custom-set-variables' or `setopt' (Emacs 29+). E.g., the following will
;; immediately change the icon theme to "Papirus" at runtime, even in running
;; applications:
;;
;; (setopt exwm-xsettings-icon-theme "Papirus")
;;; Code:
(require 'xcb-ewmh)
(require 'xcb-xsettings)
(require 'exwm-core)
(defvar exwm-xsettings--connection nil)
(defvar exwm-xsettings--XSETTINGS_SETTINGS-atom nil)
(defvar exwm-xsettings--XSETTINGS_S0-atom nil)
(defvar exwm-xsettings--selection-owner-window nil)
(defvar exwm-xsettings--serial 0)
(defun exwm-xsettings--rgba-match (_widget value)
"Return t if VALUE is a valid RGBA color."
(and (numberp value) (<= 0 value 1)))
(defun exwm-xsettings--custom-set (symbol value)
"Setter used by `exwm-xsettings' customization options.
SYMBOL is the setting being updated and VALUE is the new value."
(set-default-toplevel-value symbol value)
(exwm-xsettings--update-settings))
(defgroup exwm-xsettings nil
"XSETTINGS."
:group 'exwm)
(defcustom exwm-xsettings nil
"Alist of custom XSETTINGS.
These settings take precedence over `exwm-xsettings-theme' and
`exwm-xsettings-icon-theme'."
:type '(alist :key-type (string :tag "Name")
:value-type (choice :tag "Value"
(string :tag "String")
(integer :tag "Integer")
(list :tag "Color"
(number :tag "Red"
:type-error
"This field should contain a number between 0 and 1."
:match exwm-xsettings--rgba-match)
(number :tag "Green"
:type-error
"This field should contain a number between 0 and 1."
:match exwm-xsettings--rgba-match)
(number :tag "Blue"
:type-error
"This field should contain a number between 0 and 1."
:match exwm-xsettings--rgba-match)
(number :tag "Alpha"
:type-error
"This field should contain a number between 0 and 1."
:match exwm-xsettings--rgba-match
:value 1.0))))
:initialize #'custom-initialize-default
:set #'exwm-xsettings--custom-set)
(defcustom exwm-xsettings-theme nil
"The system-wide theme."
:type '(choice (string :tag "Theme")
(cons (string :tag "Light Theme")
(string :tag "Dark Theme")))
:initialize #'custom-initialize-default
:set #'exwm-xsettings--custom-set)
(defcustom exwm-xsettings-icon-theme nil
"The system-wide icon theme."
:type '(choice (string :tag "Icon Theme")
(cons (string :tag "Light Icon Theme")
(string :tag "Dark Icon Theme")))
:initialize #'custom-initialize-default
:set #'exwm-xsettings--custom-set)
(defalias 'exwm-xsettings--color-dark-p
(if (eval-when-compile (< emacs-major-version 29))
;; Borrowed from Emacs 29.
(lambda (rgb)
"Whether RGB is more readable against white than black."
(unless (<= 0 (apply #'min rgb) (apply #'max rgb) 1)
(error "RGB components %S not in [0,1]" rgb))
(let* ((r (expt (nth 0 rgb) 2.2))
(g (expt (nth 1 rgb) 2.2))
(b (expt (nth 2 rgb) 2.2))
(y (+ (* r 0.2126) (* g 0.7152) (* b 0.0722))))
(< y 0.325)))
'color-dark-p))
(defun exwm-xsettings--pick-theme (theme)
"Pick a light or dark theme from the given THEME.
If THEME is a string, it's returned directly.
If THEME is a cons of (LIGHT . DARK), the appropriate theme is picked based on
the default face's background color."
(pcase theme
((cl-type string) theme)
(`(,(cl-type string) . ,(cl-type string))
(if (exwm-xsettings--color-dark-p (color-name-to-rgb (face-background 'default)))
(cdr theme) (car theme)))
(_ (error "Expected theme to be a string or a pair of strings"))))
(defun exwm-xsettings--get-settings ()
"Get the current settings.
Combines `exwm-xsettings', `exwm-xsettings-theme' (if set), and
`exwm-xsettings-icon-theme' (if set)."
(cl-remove-duplicates
(append
exwm-xsettings
(when exwm-xsettings-theme
(list (cons "Net/ThemeName" (exwm-xsettings--pick-theme exwm-xsettings-theme))))
(when exwm-xsettings-icon-theme
(list (cons "Net/IconThemeName" (exwm-xsettings--pick-theme exwm-xsettings-icon-theme)))))
:key 'car
:test 'string=))
(defun exwm-xsettings--make-settings (settings serial)
"Construct a new settings object.
SETTINGS is an alist of key/value pairs.
SERIAL is a sequence number."
(make-instance 'xcb:xsettings:-Settings
:byte-order (if xcb:lsb 0 1)
:serial serial
:settings-len (length settings)
:settings
(mapcar
(lambda (prop)
(let* ((name (car prop))
(value (cdr prop))
(common (list :name name
:name-len (length name)
:last-change-serial serial)))
(pcase value
((cl-type string)
(apply #'make-instance 'xcb:xsettings:-SETTING_STRING
:value-len (length value)
:value value
common))
((cl-type integer)
(apply #'make-instance 'xcb:xsettings:-SETTING_INTEGER
:value value common))
((and (cl-type list) (app length (or 3 4)))
;; Convert from RGB(A) to 16bit integers.
(setq value (mapcar (lambda (x) (round (* x #xffff))) value))
(apply #'make-instance 'xcb:xsettings:-SETTING_COLOR
:red (pop value)
:green (pop value)
:blue (pop value)
:alpha (or (pop value) #xffff)))
(_ (error "Setting value must be a string, integer, or length 3-4 list")))))
settings)))
(defun exwm-xsettings--update-settings ()
"Update the xsettings."
(when exwm-xsettings--connection
(setq exwm-xsettings--serial (1+ exwm-xsettings--serial))
(let* ((settings (exwm-xsettings--get-settings))
(bytes (xcb:marshal (exwm-xsettings--make-settings settings exwm-xsettings--serial))))
(xcb:+request exwm-xsettings--connection
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Replace
:window exwm-xsettings--selection-owner-window
:property exwm-xsettings--XSETTINGS_SETTINGS-atom
:type exwm-xsettings--XSETTINGS_SETTINGS-atom
:format 8
:data-len (length bytes)
:data bytes)))
(xcb:flush exwm-xsettings--connection)))
(defun exwm-xsettings--on-theme-change (&rest _)
"Called when the Emacs theme is changed."
;; We only bother updating the xsettings if changing the theme could effect
;; the settings.
(when (or (consp exwm-xsettings-theme) (consp exwm-xsettings-icon-theme))
(exwm-xsettings--update-settings)))
(defun exwm-xsettings--on-SelectionClear (_data _synthetic)
"Called when another xsettings daemon takes over."
(exwm--log "XSETTINGS manager has been replaced.")
(exwm-xsettings--exit))
(cl-defun exwm-xsettings--init ()
"Initialize the XSETTINGS module."
(exwm--log)
(cl-assert (not exwm-xsettings--connection))
;; Connect
(setq exwm-xsettings--connection (xcb:connect))
(set-process-query-on-exit-flag (slot-value exwm-xsettings--connection
'process)
nil)
;; Intern the atoms.
(setq exwm-xsettings--XSETTINGS_SETTINGS-atom
(exwm--intern-atom "_XSETTINGS_SETTINGS" exwm-xsettings--connection)
exwm-xsettings--XSETTINGS_S0-atom
(exwm--intern-atom "_XSETTINGS_S0" exwm-xsettings--connection))
;; Detect running XSETTINGS managers.
(with-slots (owner)
(xcb:+request-unchecked+reply exwm-xsettings--connection
(make-instance 'xcb:GetSelectionOwner
:selection exwm-xsettings--XSETTINGS_S0-atom))
(when (/= owner xcb:Window:None)
(xcb:disconnect exwm-xsettings--connection)
(setq exwm-xsettings--connection nil)
(warn "[EXWM] Other XSETTINGS manager detected")
(cl-return-from exwm-xsettings--init)))
(let ((id(xcb:generate-id exwm-xsettings--connection)))
(setq exwm-xsettings--selection-owner-window id)
;; Create a settings window.
(xcb:+request exwm-xsettings--connection
(make-instance 'xcb:CreateWindow
:wid id
:parent exwm--root
:class xcb:WindowClass:InputOnly
:x 0
:y 0
:width 1
:height 1
:border-width 0
:depth 0
:visual 0
:value-mask xcb:CW:OverrideRedirect
:override-redirect 1))
;; Set _NET_WM_NAME.
(xcb:+request exwm-xsettings--connection
(make-instance 'xcb:ewmh:set-_NET_WM_NAME
:window id
:data "EXWM: exwm-xsettings--selection-owner-window"))
;; Apply the XSETTINGS properties.
(exwm-xsettings--update-settings)
;; Take ownership and notify.
(xcb:+request exwm-xsettings--connection
(make-instance 'xcb:SetSelectionOwner
:owner id
:selection exwm-xsettings--XSETTINGS_S0-atom
:time xcb:Time:CurrentTime))
(xcb:+request exwm-xsettings--connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination exwm--root
:event-mask xcb:EventMask:StructureNotify
:event (xcb:marshal
(make-instance 'xcb:xsettings:-ClientMessage
:window exwm--root
:time xcb:Time:CurrentTime
:selection exwm-xsettings--XSETTINGS_S0-atom
:owner id)
exwm-xsettings--connection)))
;; Detect loss of XSETTINGS ownership.
(xcb:+event exwm-xsettings--connection 'xcb:SelectionClear
#'exwm-xsettings--on-SelectionClear)
(xcb:flush exwm-xsettings--connection))
;; Update the xsettings if/when the theme changes.
(add-hook 'enable-theme-functions #'exwm-xsettings--on-theme-change)
(add-hook 'disable-theme-functions #'exwm-xsettings--on-theme-change))
(defun exwm-xsettings--exit ()
"Exit the XSETTINGS module."
(exwm--log)
(when exwm-xsettings--connection
(remove-hook 'enable-theme-functions #'exwm-xsettings--on-theme-change)
(remove-hook 'disable-theme-functions #'exwm-xsettings--on-theme-change)
(xcb:disconnect exwm-xsettings--connection)
(setq exwm-xsettings--connection nil
exwm-xsettings--XSETTINGS_SETTINGS-atom nil
exwm-xsettings--XSETTINGS_S0-atom nil
exwm-xsettings--selection-owner-window nil)))
(defun exwm-xsettings-enable ()
"Enable xsettings support for EXWM."
(exwm--log)
(add-hook 'exwm-init-hook #'exwm-xsettings--init)
(add-hook 'exwm-exit-hook #'exwm-xsettings--exit))
(provide 'exwm-xsettings)
;;; exwm-xsettings.el ends here
|