;;; exwm-xim.el --- XIM Module for EXWM -*- lexical-binding: t -*-
;; Copyright (C) 2019-2021 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 XIM support for EXWM and allows sending characters
;; generated by any Emacs's builtin input method (info node `Input Methods')
;; to X windows.
;; This module is essentially an X input method server utilizing Emacs as
;; its backend. It talks with X windows through the XIM protocol. The XIM
;; protocol is quite flexible by itself, stating that an implementation can
;; create network connections of various types as well as make use of an
;; existing X connection for communication, and that an IM server may
;; support multiple transport versions, various input styles and several
;; event flow modals, etc. Here we only make choices that are most popular
;; among other IM servers and more importantly, practical for Emacs to act
;; as an IM server:
;;
;; + Packets are transported on top of an X connection like most IMEs.
;; + Only transport version 0.0 (i.e. only-CM & Property-with-CM) is
;; supported (same as "IM Server Developers Kit", adopted by most IMEs).
;; + Only support static event flow, on-demand-synchronous method.
;; + Only "root-window" input style is supported.
;; To use this module, first load and enable it as follows:
;;
;; (require 'exwm-xim)
;; (exwm-xim-enable)
;;
;; A keybinding for `toggle-input-method' is probably required to turn on &
;; off an input method (default to `default-input-method'). It's bound to
;; 'C-\' by default and can be made reachable when working with X windows:
;;
;; (push ?\C-\\ exwm-input-prefix-keys)
;;
;; It's also required (and error-prone) to setup environment variables to
;; make applications actually use this input method. Typically the
;; following lines should be inserted into '~/.xinitrc'.
;;
;; export XMODIFIERS=@im=exwm-xim
;; export GTK_IM_MODULE=xim
;; export QT_IM_MODULE=xim
;; export CLUTTER_IM_MODULE=xim
;; References:
;; + XIM (http://www.x.org/releases/X11R7.6/doc/libX11/specs/XIM/xim.html)
;; + IMdkit (http://xorg.freedesktop.org/archive/unsupported/lib/IMdkit/)
;; + UIM (https://github.com/uim/uim)
;;; Code:
(eval-when-compile (require 'cl-lib))
(require 'xcb-keysyms)
(require 'xcb-xim)
(require 'exwm-core)
(require 'exwm-input)
(defconst exwm-xim--locales
"@locale=\
aa,af,ak,am,an,anp,ar,as,ast,ayc,az,be,bem,ber,bg,bhb,bho,bn,bo,br,brx,bs,byn,\
ca,ce,cmn,crh,cs,csb,cv,cy,da,de,doi,dv,dz,el,en,es,et,eu,fa,ff,fi,fil,fo,fr,\
fur,fy,ga,gd,gez,gl,gu,gv,ha,hak,he,hi,hne,hr,hsb,ht,hu,hy,ia,id,ig,ik,is,it,\
iu,iw,ja,ka,kk,kl,km,kn,ko,kok,ks,ku,kw,ky,lb,lg,li,li,lij,lo,lt,lv,lzh,mag,\
mai,mg,mhr,mi,mk,ml,mn,mni,mr,ms,mt,my,nan,nb,nds,ne,nhn,niu,nl,nn,nr,nso,oc,\
om,or,os,pa,pa,pap,pl,ps,pt,quz,raj,ro,ru,rw,sa,sat,sc,sd,se,shs,si,sid,sk,sl,\
so,sq,sr,ss,st,sv,sw,szl,ta,tcy,te,tg,th,the,ti,tig,tk,tl,tn,tr,ts,tt,ug,uk,\
unm,ur,uz,ve,vi,wa,wae,wal,wo,xh,yi,yo,yue,zh,zu,\
C,no"
"All supported locales (stolen from glibc).")
(defconst exwm-xim--default-error
(make-instance 'xim:error
:im-id 0
:ic-id 0
:flag xim:error-flag:invalid-both
:error-code xim:error-code:bad-something
:length 0
:type 0
:detail nil)
"Default error returned to clients.")
(defconst exwm-xim--default-im-attrs
(list (make-instance 'xim:XIMATTR
:id 0
:type xim:ATTRIBUTE-VALUE-TYPE:xim-styles
:length (length xlib:XNQueryInputStyle)
:attribute xlib:XNQueryInputStyle))
"Default IM attrs returned to clients.")
(defconst exwm-xim--default-ic-attrs
(list (make-instance 'xim:XICATTR
:id 0
:type xim:ATTRIBUTE-VALUE-TYPE:long-data
:length (length xlib:XNInputStyle)
:attribute xlib:XNInputStyle)
(make-instance 'xim:XICATTR
:id 1
:type xim:ATTRIBUTE-VALUE-TYPE:window
:length (length xlib:XNClientWindow)
:attribute xlib:XNClientWindow)
;; Required by e.g. xterm.
(make-instance 'xim:XICATTR
:id 2
:type xim:ATTRIBUTE-VALUE-TYPE:window
:length (length xlib:XNFocusWindow)
:attribute xlib:XNFocusWindow))
"Default IC attrs returned to clients.")
(defconst exwm-xim--default-styles
(make-instance 'xim:XIMStyles
:number nil
:styles (list (logior xlib:XIMPreeditNothing
xlib:XIMStatusNothing)))
"Default styles: root-window, i.e. no preediting or status display support.")
(defconst exwm-xim--default-attributes
(list (make-instance 'xim:XIMATTRIBUTE
:id 0
:length nil
:value exwm-xim--default-styles))
"Default IM/IC attributes returned to clients.")
(defvar exwm-xim--conn nil
"The X connection for initiating other XIM connections.")
(defvar exwm-xim--event-xwin nil
"X window for initiating new XIM connections.")
(defvar exwm-xim--server-client-plist '(nil nil)
"Plist mapping server window to [X connection, client window, byte-order].")
(defvar exwm-xim--client-server-plist '(nil nil)
"Plist mapping client window to server window.")
(defvar exwm-xim--property-index 0 "For generating a unique property name.")
(defvar exwm-xim--im-id 0 "Last IM ID.")
(defvar exwm-xim--ic-id 0 "Last IC ID.")
;; X11 atoms.
(defvar exwm-xim--@server nil)
(defvar exwm-xim--LOCALES nil)
(defvar exwm-xim--TRANSPORT nil)
(defvar exwm-xim--XIM_SERVERS nil)
(defvar exwm-xim--_XIM_PROTOCOL nil)
(defvar exwm-xim--_XIM_XCONNECT nil)
(defvar exwm-xim-buffer-p nil
"Whether current buffer is used by exwm-xim.")
(make-variable-buffer-local 'exwm-xim-buffer-p)
(defun exwm-xim--on-SelectionRequest (data _synthetic)
"Handle SelectionRequest events on IMS window.
Such events would be received when clients query for LOCALES or TRANSPORT."
(exwm--log)
(let ((evt (make-instance 'xcb:SelectionRequest))
value fake-event)
(xcb:unmarshal evt data)
(with-slots (time requestor selection target property) evt
(setq value (cond ((= target exwm-xim--LOCALES)
;; Return supported locales.
exwm-xim--locales)
((= target exwm-xim--TRANSPORT)
;; Use XIM over an X connection.
"@transport=X/")))
(when value
;; Change the property.
(xcb:+request exwm-xim--conn
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Replace
:window requestor
:property property
:type target
:format 8
:data-len (length value)
:data value))
;; Send a SelectionNotify event.
(setq fake-event (make-instance 'xcb:SelectionNotify
:time time
:requestor requestor
:selection selection
:target target
:property property))
(xcb:+request exwm-xim--conn
(make-instance 'xcb:SendEvent
:propagate 0
:destination requestor
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal fake-event exwm-xim--conn)))
(xcb:flush exwm-xim--conn)))))
(cl-defun exwm-xim--on-ClientMessage-0 (data _synthetic)
"Handle ClientMessage event on IMS window (new connection).
Such events would be received when clients request for _XIM_XCONNECT.
A new X connection and server window would be created to communicate with
this client."
(exwm--log)
(let ((evt (make-instance 'xcb:ClientMessage))
conn client-xwin server-xwin)
(xcb:unmarshal evt data)
(with-slots (window type data) evt
(unless (= type exwm-xim--_XIM_XCONNECT)
;; Only handle _XIM_XCONNECT.
(exwm--log "Ignore ClientMessage %s" type)
(cl-return-from exwm-xim--on-ClientMessage-0))
(setq client-xwin (elt (slot-value data 'data32) 0)
;; Create a new X connection and a new server window.
conn (xcb:connect)
server-xwin (xcb:generate-id conn))
(set-process-query-on-exit-flag (slot-value conn 'process) nil)
;; Store this client.
(plist-put exwm-xim--server-client-plist server-xwin
`[,conn ,client-xwin nil])
(plist-put exwm-xim--client-server-plist client-xwin server-xwin)
;; Select DestroyNotify events on this client window.
(xcb:+request exwm-xim--conn
(make-instance 'xcb:ChangeWindowAttributes
:window client-xwin
:value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:StructureNotify))
(xcb:flush exwm-xim--conn)
;; Handle ClientMessage events from this new connection.
(xcb:+event conn 'xcb:ClientMessage #'exwm-xim--on-ClientMessage)
;; Create a communication window.
(xcb:+request conn
(make-instance 'xcb:CreateWindow
:depth 0
:wid server-xwin
:parent exwm--root
:x 0
:y 0
:width 1
:height 1
:border-width 0
:class xcb:WindowClass:InputOutput
:visual 0
:value-mask xcb:CW:OverrideRedirect
:override-redirect 1))
(xcb:flush conn)
;; Send connection establishment ClientMessage.
(setf window client-xwin
(slot-value data 'data32) `(,server-xwin 0 0 0 0))
(slot-makeunbound data 'data8)
(slot-makeunbound data 'data16)
(xcb:+request exwm-xim--conn
(make-instance 'xcb:SendEvent
:propagate 0
:destination client-xwin
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal evt exwm-xim--conn)))
(xcb:flush exwm-xim--conn))))
(cl-defun exwm-xim--on-ClientMessage (data _synthetic)
"Handle ClientMessage event on IMS communication window (request).
Such events would be received when clients request for _XIM_PROTOCOL.
The actual XIM request is in client message data or a property."
(exwm--log)
(let ((evt (make-instance 'xcb:ClientMessage))
conn client-xwin server-xwin)
(xcb:unmarshal evt data)
(with-slots (format window type data) evt
(unless (= type exwm-xim--_XIM_PROTOCOL)
(exwm--log "Ignore ClientMessage %s" type)
(cl-return-from exwm-xim--on-ClientMessage))
(setq server-xwin window
conn (plist-get exwm-xim--server-client-plist server-xwin)
client-xwin (elt conn 1)
conn (elt conn 0))
(cond ((= format 8)
;; Data.
(exwm-xim--on-request (vconcat (slot-value data 'data8))
conn client-xwin server-xwin))
((= format 32)
;; Atom.
(with-slots (data32) data
(with-slots (value)
(xcb:+request-unchecked+reply conn
(make-instance 'xcb:GetProperty
:delete 1
:window server-xwin
:property (elt data32 1)
:type xcb:GetPropertyType:Any
:long-offset 0
:long-length (elt data32 0)))
(when (> (length value) 0)
(exwm-xim--on-request value conn client-xwin
server-xwin)))))))))
(defun exwm-xim--on-request (data conn client-xwin server-xwin)
"Handle an XIM reuqest."
(exwm--log)
(let ((opcode (elt data 0))
;; Let-bind `xim:lsb' to make pack/unpack functions work correctly.
(xim:lsb (elt (plist-get exwm-xim--server-client-plist server-xwin) 2))
req replies)
(cond ((= opcode xim:opcode:error)
(exwm--log "ERROR: %s" data))
((= opcode xim:opcode:connect)
(exwm--log "CONNECT")
(setq xim:lsb (= (elt data 4) xim:connect-byte-order:lsb-first))
;; Store byte-order.
(setf (elt (plist-get exwm-xim--server-client-plist server-xwin) 2)
xim:lsb)
(setq req (make-instance 'xim:connect))
(xcb:unmarshal req data)
(if (and (= (slot-value req 'major-version) 1)
(= (slot-value req 'minor-version) 0)
;; Do not support authentication.
(= (slot-value req 'number) 0))
;; Accept the connection.
(push (make-instance 'xim:connect-reply) replies)
;; Deny it.
(push exwm-xim--default-error replies)))
((memq opcode (list xim:opcode:auth-required
xim:opcode:auth-reply
xim:opcode:auth-next
xim:opcode:auth-ng))
(exwm--log "AUTH: %d" opcode)
;; Deny any attempt to make authentication.
(push exwm-xim--default-error replies))
((= opcode xim:opcode:disconnect)
(exwm--log "DISCONNECT")
;; Gracefully disconnect from the client.
(exwm-xim--make-request (make-instance 'xim:disconnect-reply)
conn client-xwin)
;; Destroy the communication window & connection.
(xcb:+request conn
(make-instance 'xcb:DestroyWindow
:window server-xwin))
(xcb:disconnect conn)
;; Clean up cache.
(cl-remf exwm-xim--server-client-plist server-xwin)
(cl-remf exwm-xim--client-server-plist client-xwin))
((= opcode xim:opcode:open)
(exwm--log "OPEN")
;; Note: We make no check here.
(setq exwm-xim--im-id (if (< exwm-xim--im-id #xffff)
(1+ exwm-xim--im-id)
1))
(setq replies
(list
(make-instance 'xim:open-reply
:im-id exwm-xim--im-id
:im-attrs-length nil
:im-attrs exwm-xim--default-im-attrs
:ic-attrs-length nil
:ic-attrs exwm-xim--default-ic-attrs)
(make-instance 'xim:set-event-mask
:im-id exwm-xim--im-id
:ic-id 0
;; Static event flow.
:forward-event-mask xcb:EventMask:KeyPress
;; on-demand-synchronous method.
:synchronous-event-mask
xcb:EventMask:NoEvent))))
((= opcode xim:opcode:close)
(exwm--log "CLOSE")
(setq req (make-instance 'xim:close))
(xcb:unmarshal req data)
(push (make-instance 'xim:close-reply
:im-id (slot-value req 'im-id))
replies))
((= opcode xim:opcode:trigger-notify)
(exwm--log "TRIGGER-NOTIFY")
;; Only static event flow modal is supported.
(push exwm-xim--default-error replies))
((= opcode xim:opcode:encoding-negotiation)
(exwm--log "ENCODING-NEGOTIATION")
(setq req (make-instance 'xim:encoding-negotiation))
(xcb:unmarshal req data)
(let ((index (cl-position "COMPOUND_TEXT"
(mapcar (lambda (i) (slot-value i 'name))
(slot-value req 'names))
:test #'equal)))
(unless index
;; Fallback to portable character encoding (a subset of ASCII).
(setq index -1))
(push (make-instance 'xim:encoding-negotiation-reply
:im-id (slot-value req 'im-id)
:category
xim:encoding-negotiation-reply-category:name
:index index)
replies)))
((= opcode xim:opcode:query-extension)
(exwm--log "QUERY-EXTENSION")
(setq req (make-instance 'xim:query-extension))
(xcb:unmarshal req data)
(push (make-instance 'xim:query-extension-reply
:im-id (slot-value req 'im-id)
;; No extension support.
:length 0
:extensions nil)
replies))
((= opcode xim:opcode:set-im-values)
(exwm--log "SET-IM-VALUES")
;; There's only one possible input method attribute.
(setq req (make-instance 'xim:set-im-values))
(xcb:unmarshal req data)
(push (make-instance 'xim:set-im-values-reply
:im-id (slot-value req 'im-id))
replies))
((= opcode xim:opcode:get-im-values)
(exwm--log "GET-IM-VALUES")
(setq req (make-instance 'xim:get-im-values))
(let (im-attributes-id)
(xcb:unmarshal req data)
(setq im-attributes-id (slot-value req 'im-attributes-id))
(if (cl-notevery (lambda (i) (= i 0)) im-attributes-id)
;; Only support one IM attributes.
(push (make-instance 'xim:error
:im-id (slot-value req 'im-id)
:ic-id 0
:flag xim:error-flag:invalid-ic-id
:error-code xim:error-code:bad-something
:length 0
:type 0
:detail nil)
replies)
(push
(make-instance 'xim:get-im-values-reply
:im-id (slot-value req 'im-id)
:length nil
:im-attributes exwm-xim--default-attributes)
replies))))
((= opcode xim:opcode:create-ic)
(exwm--log "CREATE-IC")
(setq req (make-instance 'xim:create-ic))
(xcb:unmarshal req data)
;; Note: The ic-attributes slot is ignored.
(setq exwm-xim--ic-id (if (< exwm-xim--ic-id #xffff)
(1+ exwm-xim--ic-id)
1))
(push (make-instance 'xim:create-ic-reply
:im-id (slot-value req 'im-id)
:ic-id exwm-xim--ic-id)
replies))
((= opcode xim:opcode:destroy-ic)
(exwm--log "DESTROY-IC")
(setq req (make-instance 'xim:destroy-ic))
(xcb:unmarshal req data)
(push (make-instance 'xim:destroy-ic-reply
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id))
replies))
((= opcode xim:opcode:set-ic-values)
(exwm--log "SET-IC-VALUES")
(setq req (make-instance 'xim:set-ic-values))
(xcb:unmarshal req data)
;; We don't distinguish between input contexts.
(push (make-instance 'xim:set-ic-values-reply
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id))
replies))
((= opcode xim:opcode:get-ic-values)
(exwm--log "GET-IC-VALUES")
(setq req (make-instance 'xim:get-ic-values))
(xcb:unmarshal req data)
(push (make-instance 'xim:get-ic-values-reply
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id)
:length nil
:ic-attributes exwm-xim--default-attributes)
replies))
((= opcode xim:opcode:set-ic-focus)
(exwm--log "SET-IC-FOCUS")
;; All input contexts are the same.
)
((= opcode xim:opcode:unset-ic-focus)
(exwm--log "UNSET-IC-FOCUS")
;; All input contexts are the same.
)
((= opcode xim:opcode:forward-event)
(exwm--log "FORWARD-EVENT")
(setq req (make-instance 'xim:forward-event))
(xcb:unmarshal req data)
(exwm-xim--handle-forward-event-request req xim:lsb conn
client-xwin))
((= opcode xim:opcode:sync)
(exwm--log "SYNC")
(setq req (make-instance 'xim:sync))
(xcb:unmarshal req data)
(push (make-instance 'xim:sync-reply
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id))
replies))
((= opcode xim:opcode:sync-reply)
(exwm--log "SYNC-REPLY"))
((= opcode xim:opcode:reset-ic)
(exwm--log "RESET-IC")
;; No context-specific data saved.
(setq req (make-instance 'xim:reset-ic))
(xcb:unmarshal req data)
(push (make-instance 'xim:reset-ic-reply
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id)
:length 0
:string "")
replies))
((memq opcode (list xim:opcode:str-conversion-reply
xim:opcode:preedit-start-reply
xim:opcode:preedit-caret-reply))
(exwm--log "PREEDIT: %d" opcode)
;; No preedit support.
(push exwm-xim--default-error replies))
(t
(exwm--log "Bad protocol")
(push exwm-xim--default-error replies)))
;; Actually send the replies.
(when replies
(mapc (lambda (reply)
(exwm-xim--make-request reply conn client-xwin))
replies)
(xcb:flush conn))))
(defun exwm-xim--handle-forward-event-request (req lsb conn client-xwin)
(let ((im-func (with-current-buffer (window-buffer)
input-method-function))
key-event keysym keysyms event result)
;; Note: The flag slot is ignored.
;; Do conversion in client's byte-order.
(let ((xcb:lsb lsb))
(setq key-event (make-instance 'xcb:KeyPress))
(xcb:unmarshal key-event (slot-value req 'event)))
(with-slots (detail state) key-event
(setq keysym (xcb:keysyms:keycode->keysym exwm-xim--conn detail
state))
(when (/= (car keysym) 0)
(setq event (xcb:keysyms:keysym->event
exwm-xim--conn
(car keysym)
(logand state (lognot (cdr keysym)))))))
(while (or (slot-value req 'event) unread-command-events)
(unless (slot-value req 'event)
(setq event (pop unread-command-events))
;; Handle events in (t . EVENT) format.
(when (and (consp event)
(eq (car event) t))
(setq event (cdr event))))
(if (or (not im-func)
;; `list' is the default method.
(eq im-func #'list)
(not event)
;; Select only printable keys.
(not (integerp event)) (> #x20 event) (< #x7e event))
;; Either there is no active input method, or invalid key
;; is detected.
(with-slots ((raw-event event)
im-id ic-id serial-number)
req
(if raw-event
(setq event raw-event)
(setq keysyms (xcb:keysyms:event->keysyms exwm-xim--conn event))
(with-slots (detail state) key-event
(setf detail (xcb:keysyms:keysym->keycode exwm-xim--conn
(caar keysyms))
state (cdar keysyms)))
(setq event (let ((xcb:lsb lsb))
(xcb:marshal key-event conn))))
(when event
(exwm-xim--make-request
(make-instance 'xim:forward-event
:im-id im-id
:ic-id ic-id
:flag xim:commit-flag:synchronous
:serial-number serial-number
:event event)
conn client-xwin)))
(when (eq exwm--selected-input-mode 'char-mode)
;; Grab keyboard temporarily for char-mode.
(exwm-input--grab-keyboard))
(unwind-protect
(with-temp-buffer
;; This variable is used to test whether exwm-xim is enabled.
;; Used by e.g. pyim-probe.
(setq-local exwm-xim-buffer-p t)
;; Always show key strokes.
(let ((input-method-use-echo-area t)
(exwm-input-line-mode-passthrough t))
(setq result (funcall im-func event))
;; Clear echo area for the input method.
(message nil)
;; This also works for portable character encoding.
(setq result
(encode-coding-string (concat result)
'compound-text-with-extensions))
(exwm-xim--make-request
(make-instance 'xim:commit-x-lookup-chars
:im-id (slot-value req 'im-id)
:ic-id (slot-value req 'ic-id)
:flag (logior xim:commit-flag:synchronous
xim:commit-flag:x-lookup-chars)
:length (length result)
:string result)
conn client-xwin)))
(when (eq exwm--selected-input-mode 'char-mode)
(exwm-input--release-keyboard))))
(xcb:flush conn)
(setf event nil
(slot-value req 'event) nil))))
(defun exwm-xim--make-request (req conn client-xwin)
"Make an XIM request REQ via connection CONN.
CLIENT-XWIN would receive a ClientMessage event either telling the client
the request data or where to fetch the data."
(exwm--log)
(let ((data (xcb:marshal req))
property format client-message-data client-message)
(if (<= (length data) 20)
;; Send short requests directly with client messages.
(setq format 8
;; Pad to 20 bytes.
data (append data (make-list (- 20 (length data)) 0))
client-message-data (make-instance 'xcb:ClientMessageData
:data8 data))
;; Send long requests with properties.
(setq property (exwm--intern-atom (format "_EXWM_XIM_%x"
exwm-xim--property-index)))
(cl-incf exwm-xim--property-index)
(xcb:+request conn
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Append
:window client-xwin
:property property
:type xcb:Atom:STRING
:format 8
:data-len (length data)
:data data))
;; Also send a client message to notify the client about this property.
(setq format 32
client-message-data (make-instance 'xcb:ClientMessageData
:data32 `(,(length data)
,property
;; Pad to 20 bytes.
0 0 0))))
;; Send the client message.
(setq client-message (make-instance 'xcb:ClientMessage
:format format
:window client-xwin
:type exwm-xim--_XIM_PROTOCOL
:data client-message-data))
(xcb:+request conn
(make-instance 'xcb:SendEvent
:propagate 0
:destination client-xwin
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal client-message conn)))))
(defun exwm-xim--on-DestroyNotify (data synthetic)
"Do cleanups on receiving DestroyNotify event.
Such event would be received when the client window is destroyed."
(exwm--log)
(unless synthetic
(let ((evt (make-instance 'xcb:DestroyNotify))
conn client-xwin server-xwin)
(xcb:unmarshal evt data)
(setq client-xwin (slot-value evt 'window)
server-xwin (plist-get exwm-xim--client-server-plist client-xwin))
(when server-xwin
(setq conn (aref (plist-get exwm-xim--server-client-plist server-xwin)
0))
(cl-remf exwm-xim--server-client-plist server-xwin)
(cl-remf exwm-xim--client-server-plist client-xwin)
;; Destroy the communication window & connection.
(xcb:+request conn
(make-instance 'xcb:DestroyWindow
:window server-xwin))
(xcb:disconnect conn)))))
(cl-defun exwm-xim--init ()
"Initialize the XIM module."
(exwm--log)
(when exwm-xim--conn
(cl-return-from exwm-xim--init))
;; Initialize atoms.
(setq exwm-xim--@server (exwm--intern-atom "@server=exwm-xim")
exwm-xim--LOCALES (exwm--intern-atom "LOCALES")
exwm-xim--TRANSPORT (exwm--intern-atom "TRANSPORT")
exwm-xim--XIM_SERVERS (exwm--intern-atom "XIM_SERVERS")
exwm-xim--_XIM_PROTOCOL (exwm--intern-atom "_XIM_PROTOCOL")
exwm-xim--_XIM_XCONNECT (exwm--intern-atom "_XIM_XCONNECT"))
;; Create a new connection and event window.
(setq exwm-xim--conn (xcb:connect)
exwm-xim--event-xwin (xcb:generate-id exwm-xim--conn))
(set-process-query-on-exit-flag (slot-value exwm-xim--conn 'process) nil)
;; Initialize xcb:keysyms module.
(xcb:keysyms:init exwm-xim--conn)
;; Listen to SelectionRequest event for connection establishment.
(xcb:+event exwm-xim--conn 'xcb:SelectionRequest
#'exwm-xim--on-SelectionRequest)
;; Listen to ClientMessage event on IMS window for new XIM connection.
(xcb:+event exwm-xim--conn 'xcb:ClientMessage #'exwm-xim--on-ClientMessage-0)
;; Listen to DestroyNotify event to do cleanups.
(xcb:+event exwm-xim--conn 'xcb:DestroyNotify #'exwm-xim--on-DestroyNotify)
;; Create the event window.
(xcb:+request exwm-xim--conn
(make-instance 'xcb:CreateWindow
:depth 0
:wid exwm-xim--event-xwin
:parent exwm--root
:x 0
:y 0
:width 1
:height 1
:border-width 0
:class xcb:WindowClass:InputOutput
:visual 0
:value-mask xcb:CW:OverrideRedirect
:override-redirect 1))
;; Set the selection owner.
(xcb:+request exwm-xim--conn
(make-instance 'xcb:SetSelectionOwner
:owner exwm-xim--event-xwin
:selection exwm-xim--@server
:time xcb:Time:CurrentTime))
;; Set XIM_SERVERS property on the root window.
(xcb:+request exwm-xim--conn
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Prepend
:window exwm--root
:property exwm-xim--XIM_SERVERS
:type xcb:Atom:ATOM
:format 32
:data-len 1
:data (funcall (if xcb:lsb
#'xcb:-pack-u4-lsb
#'xcb:-pack-u4)
exwm-xim--@server)))
(xcb:flush exwm-xim--conn))
(cl-defun exwm-xim--exit ()
"Exit the XIM module."
(exwm--log)
;; Close IMS communication connections.
(mapc (lambda (i)
(when (vectorp i)
(xcb:disconnect (elt i 0))))
exwm-xim--server-client-plist)
;; Close the IMS connection.
(unless exwm-xim--conn
(cl-return-from exwm-xim--exit))
;; Remove exwm-xim from XIM_SERVERS.
(let ((reply (xcb:+request-unchecked+reply exwm-xim--conn
(make-instance 'xcb:GetProperty
:delete 1
:window exwm--root
:property exwm-xim--XIM_SERVERS
:type xcb:Atom:ATOM
:long-offset 0
:long-length 1000)))
unpacked-reply pack unpack)
(unless reply
(cl-return-from exwm-xim--exit))
(setq reply (slot-value reply 'value))
(unless (> (length reply) 4)
(cl-return-from exwm-xim--exit))
(setq reply (vconcat reply)
pack (if xcb:lsb #'xcb:-pack-u4-lsb #'xcb:-pack-u4)
unpack (if xcb:lsb #'xcb:-unpack-u4-lsb #'xcb:-unpack-u4))
(dotimes (i (/ (length reply) 4))
(push (funcall unpack reply (* i 4)) unpacked-reply))
(setq unpacked-reply (delq exwm-xim--@server unpacked-reply)
reply (mapcar pack unpacked-reply))
(xcb:+request exwm-xim--conn
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Replace
:window exwm--root
:property exwm-xim--XIM_SERVERS
:type xcb:Atom:ATOM
:format 32
:data-len (length reply)
:data reply))
(xcb:flush exwm-xim--conn))
(xcb:disconnect exwm-xim--conn)
(setq exwm-xim--conn nil))
(defun exwm-xim-enable ()
"Enable XIM support for EXWM."
(exwm--log)
(add-hook 'exwm-init-hook #'exwm-xim--init)
(add-hook 'exwm-exit-hook #'exwm-xim--exit))
(provide 'exwm-xim)
;;; exwm-xim.el ends here
