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exim.el
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;;; exim.el --- Emacs X Input Method -*- lexical-binding: t -*-
;; Copyright (C) 2015 Chris Feng
;; Author: Chris Feng <chris.w.feng@gmail.com>
;; Maintainer: Chris Feng <chris.w.feng@gmail.com>
;; Version: 0
;; Package-Requires: ((xelb "0.1"))
;; Keywords: unix, i18n
;; URL: https://github.com/ch11ng/exim
;; 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:
;; EXIM (Emacs X Input Method) is an X input method server utilizing Emacs as
;; its backend. It's mainly designed for working with EXWM window manger.
;; Considering that Emacs ships with a bunch of builtin input methods (in LEIM)
;; and it's easy to make new ones for it, EXIM can support a large variety of
;; input methods.
;; Note that this is not the only input method working in EXWM; perhaps other
;; IM servers also work. This just provides an alternative.
;; 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 a IM server:
;; + Packets are transported on top of an X connection, as is adopted by most
;; IMEs.
;; + Only transport version 0.0 (i.e. only-CM & Property-with-CM) is supported
;; (same as "IM Server Developers Kit", which is used by most IMEs).
;; + Only support static event flow, on-demand-synchronous method.
;; + Only "root-window" input style is supported.
;; To enable EXIM for EXWM, follow these steps:
;; 0. Install exwm first.
;; 1. Save EXIM to your disk and make sure it's in `load-path'.
;; 2. Add following lines to your Emacs init file:
;;
;; (require 'exim)
;; (add-hook 'exwm-init-hook 'exim-start)
;;
;; 3. Bind a key to toggle input method. Typically you should choose 'C-\'.
;; 4. Insert following lines to '~/.xinitrc':
;;
;; export XMODIFIERS=@im=exim
;; export GTK_IM_MODULE=xim
;; export QT_IM_MODULE=xim
;; export CLUTTER_IM_MODULE=xim
;;
;; Todo:
;; + Exploit input-method-[de]activate-hook to reduce unnecessary traffic.
;; + Are strings NULL-terminated? (UIM)
;; + Some requests should be handled synchronously.
;; 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-xim)
(require 'xcb-keysyms)
(eval-and-compile
(defvar exim-debug-on nil "Non-nil to turn on debug for EXIM."))
(defmacro exim--log (format-string &rest args)
"Print debug message."
(when exim-debug-on
`(message (concat "[EXIM] " ,format-string) ,@args)))
;; Locales from glibc
(defconst exim--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")
(defvar exim--internal '(nil nil))
(defvar exim--connection nil)
(defvar exim--root nil)
(defvar exim--window nil)
(defvar exim--XIM_SERVERS nil)
(defvar exim--server nil)
(defvar exim--LOCALES nil)
(defvar exim--property-index 0)
(defvar exim--im-id 0)
(defvar exim--ic-id 0)
(defvar exim--TRANSPORT nil)
(defvar exim--_XIM_XCONNECT nil)
(defvar exim--_XIM_PROTOCOL nil)
(defvar exim--event-pending nil)
(defun exim--on-SelectionRequest (data _synthetic)
"Handle SelectionRequest event on IMS window."
(let ((obj (make-instance 'xcb:SelectionRequest))
value)
(xcb:unmarshal obj data)
(with-slots (time requestor selection target property) obj
(setq value (if (= target exim--LOCALES)
exim--locales
(when (= target exim--TRANSPORT)
"@transport=X/")))
(when value
;; Change the property
(xcb:+request exim--connection
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Replace
:window requestor
:property property
:type target
:format 8
:data-len (length value)
:data value))
;; Send SelectionNotify event
(xcb:+request exim--connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination requestor
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal
(make-instance 'xcb:SelectionNotify
:time time
:requestor requestor
:selection selection
:target target
:property property)
exim--connection)))
(xcb:flush exim--connection)))))
(defun exim--on-ClientMessage-0 (data _synthetic)
"Handle ClientMessage event on IMS window (new connection)."
(let ((obj (make-instance 'xcb:ClientMessage))
data32 client-win new-connection server-win)
(xcb:unmarshal obj data)
(if (/= (slot-value obj 'type) exim--_XIM_XCONNECT)
(exim--log "ClientMessage %s instead of %s (_XIM_XCONNECT) received"
(slot-value obj 'type) exim--_XIM_XCONNECT)
;; Create new X connection
(setq data32 (slot-value (slot-value obj 'data) 'data32)
client-win (elt data32 0)
new-connection (xcb:connect-to-socket)
server-win (xcb:generate-id new-connection))
;; Add listener for DestroyNotify event on client-win
(xcb:+request exim--connection
(make-instance 'xcb:ChangeWindowAttributes
:window client-win
:value-mask xcb:CW:EventMask
:event-mask xcb:EventMask:StructureNotify))
(xcb:flush exim--connection)
(set-process-query-on-exit-flag (slot-value new-connection 'process) nil)
;; Store this client
(plist-put exim--internal server-win `[,new-connection ,client-win nil])
(plist-put exim--internal client-win server-win)
;; Listen for ClientMessage event on the new connection
(xcb:+event new-connection 'xcb:ClientMessage 'exim--on-ClientMessage)
;; Create a communication window
(xcb:+request new-connection
(make-instance 'xcb:CreateWindow
:depth 0
:wid server-win
:parent exim--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 new-connection)
;; Send connection establishment ClientMessage
(setf (slot-value obj 'window) client-win
(slot-value (slot-value obj 'data) 'data32) `(,server-win 0 0 0 0))
(slot-makeunbound (slot-value obj 'data) 'data8)
(slot-makeunbound (slot-value obj 'data) 'data16)
(xcb:+request exim--connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination client-win
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal obj exim--connection)))
(xcb:flush exim--connection))))
(defun exim--on-ClientMessage (data _synthetic)
"Handle ClientMessage event on IMS communication window (request)."
(let ((obj (make-instance 'xcb:ClientMessage))
server-win client-win connection)
(xcb:unmarshal obj data)
(setq server-win (slot-value obj 'window)
connection (plist-get exim--internal server-win)
client-win (elt connection 1)
connection (elt connection 0))
(if (/= (slot-value obj 'type) exim--_XIM_PROTOCOL)
(exim--log "ClientMessage %s instead of %s received"
(slot-value obj 'type) exim--_XIM_PROTOCOL)
(pcase (slot-value obj 'format)
(8 ;; Data
(exim--on-request (vconcat (slot-value (slot-value obj 'data) 'data8))
connection client-win server-win))
(32 ;; Atom
(setq data (slot-value (slot-value obj 'data) 'data32)
data (slot-value
(xcb:+request-unchecked+reply connection
(make-instance 'xcb:GetProperty
:delete 1
:window server-win
:property (elt data 1)
:type xcb:GetPropertyType:Any
:long-offset 0
:long-length (elt data 0)))
'value))
(when (< 0 (length data)) ;can be empty
(exim--on-request data connection client-win server-win)))))))
(defun exim--on-request (data connection client-win server-win)
"Handle XIM reuqest."
(let ((opcode (elt data 0))
(xim:lsb (elt (plist-get exim--internal server-win) 2)))
(cond ((= opcode xim:opcode:error)
(exim--log "ERROR: %s" data))
((= opcode xim:opcode:connect)
(exim--log "CONNECT")
(setq xim:lsb (= (elt data 4) xim:connect-byte-order:lsb-first))
;; Store byte-order
(setf (elt (plist-get exim--internal server-win) 2) xim:lsb)
(let ((obj (make-instance 'xim:connect)))
(xcb:unmarshal obj data)
(exim--send (if (and (= 1 (slot-value obj 'major-version))
(= 0 (slot-value obj 'minor-version))
;; No authentication support
(= 0 (slot-value obj 'number)))
(make-instance 'xim:connect-reply)
(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))
connection client-win server-win)))
;; No authentication support
((or (= opcode xim:opcode:auth-required)
(= opcode xim:opcode:auth-reply)
(= opcode xim:opcode:auth-next)
(= opcode xim:opcode:auth-ng))
(exim--send (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)
connection client-win server-win))
((= opcode xim:opcode:disconnect)
(exim--log "DISCONNECT")
(cl-remf exim--internal client-win)
(cl-remf exim--internal server-win)
(exim--send (make-instance 'xim:disconnect-reply) connection
client-win server-win)
;; Destroy the communication window
(xcb:+request connection
(make-instance 'xcb:DestroyWindow
:window server-win))
;; Disconnect from the connection
(xcb:disconnect connection))
((= opcode xim:opcode:open)
(exim--log "OPEN")
;; No check is needed; simply make the reply
(let ((im-attrs
(list
(make-instance 'xim:XIMATTR
:id 0
:type xim:ATTRIBUTE-VALUE-TYPE:xim-styles
:length (length xlib:XNQueryInputStyle)
:attribute xlib:XNQueryInputStyle)))
(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))))
(cl-incf exim--im-id)
(exim--send (make-instance 'xim:open-reply
:im-id exim--im-id
:im-attrs-length nil ;auto set
:im-attrs im-attrs
:ic-attrs-length nil ;auto set
:ic-attrs ic-attrs)
connection client-win server-win)
;; Static event flow, on-demand-synchronous method
(exim--send
(make-instance 'xim:set-event-mask
:im-id exim--im-id
:ic-id 0 ;all
:forward-event-mask xcb:EventMask:KeyPress
:synchronous-event-mask xcb:EventMask:NoEvent)
connection client-win server-win)))
((= opcode xim:opcode:close)
(exim--log "CLOSE")
(let ((obj (make-instance 'xim:close)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:close-reply
:im-id (slot-value obj 'im-id))
connection client-win server-win)))
((= opcode xim:opcode:trigger-notify)
(exim--log "TRIGGER-NOTIFY")
;; Only static event flow modal is supported
(exim--send (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)
connection client-win server-win))
((= opcode xim:opcode:encoding-negotiation)
(exim--log "ENCODING-NEGOTIATION")
(let ((obj (make-instance 'xim:encoding-negotiation))
index)
(xcb:unmarshal obj data)
;; FIXME: UTF-8 encoding does not work (not decoded by client)
(setq index (cl-position "COMPOUND_TEXT"
(mapcar (lambda (i) (slot-value i 'name))
(slot-value obj 'names))
:test #'equal))
(unless index
;; Fallback to portable character encoding (a subset of ASCII)
(setq index -1))
(exim--send (make-instance
'xim:encoding-negotiation-reply
:im-id (slot-value obj 'im-id)
:category
xim:encoding-negotiation-reply-category:name
:index index)
connection client-win server-win)))
((= opcode xim:opcode:query-extension)
(exim--log "QUERY-EXTENSION")
(let ((obj (make-instance 'xim:query-extension)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:query-extension-reply
:im-id (slot-value obj 'im-id)
;; No extension support
:length 0 :extensions nil)
connection client-win server-win)))
((= opcode xim:opcode:set-im-values)
(exim--log "SET-IM-VALUES")
;; There's only one possible input method attribute; simply reply
(let ((obj (make-instance 'xim:set-im-values)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:set-im-values-reply
:im-id (slot-value obj 'im-id))
connection client-win server-win)))
((= opcode xim:opcode:get-im-values)
(exim--log "GET-IM-VALUES")
(let ((obj (make-instance 'xim:get-im-values))
(im-attributes
(list
(make-instance
'xim:XIMATTRIBUTE
:id 0
:length nil ;auto set
:value (make-instance 'xim:XIMStyles
:number nil ;auto set
;; Input sytle: root-window
:styles
(list
(logior xlib:XIMPreeditNothing
xlib:XIMStatusNothing))))))
im-attributes-id)
(xcb:unmarshal obj data)
(setq im-attributes-id (slot-value obj 'im-attributes-id))
(exim--send
(if (cl-notevery (lambda (i) (< i (length im-attributes)))
im-attributes-id)
(make-instance 'xim:error
:im-id (slot-value obj '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)
(make-instance 'xim:get-im-values-reply
:im-id (slot-value obj 'im-id)
:length nil ;auto set
:im-attributes (mapcar
(lambda (i)
(elt im-attributes i))
im-attributes-id)))
connection client-win server-win)))
((= opcode xim:opcode:create-ic)
(exim--log "CREATE-IC")
(let ((obj (make-instance 'xim:create-ic)))
;; FIXME: better be locally incremental
(cl-incf exim--ic-id)
(xcb:unmarshal obj data)
;; ic-attributes slot is simply ignored.
(exim--send (make-instance 'xim:create-ic-reply
:im-id (slot-value obj 'im-id)
:ic-id exim--ic-id)
connection client-win server-win)))
((= opcode xim:opcode:destroy-ic)
(exim--log "DESTROY-IC")
(let ((obj (make-instance 'xim:destroy-ic)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:destroy-ic-reply
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id))
connection client-win server-win)))
((= opcode xim:opcode:set-ic-values)
(exim--log "SET-IC-VALUES")
(let ((obj (make-instance 'xim:set-ic-values)))
(xcb:unmarshal obj data)
;; We don't distinguish between input contexts; simply reply here
(exim--send (make-instance 'xim:set-ic-values-reply
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id))
connection client-win server-win)))
((= opcode xim:opcode:get-ic-values)
(exim--log "GET-IC-VALUES")
(let ((obj (make-instance 'xim:get-ic-values))
(ic-attributes
(list
(make-instance 'xim:XICATTRIBUTE
:id 0
:length 4
:value (funcall
(if xim:lsb
#'xcb:-pack-u4-lsb
#'xcb:-pack-u4)
(logior xlib:XIMPreeditNothing
xlib:XIMStatusNothing)))
(make-instance 'xim:XICATTRIBUTE
:id 1
:length 4
:value [0 0 0 0]) ;FIXME: uim/xim/ximic.cpp
(make-instance 'xim:XICATTRIBUTE
:id 2
:length 4
:value [0 0 0 0])))) ;FIXME: same as above
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:get-ic-values-reply
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id)
:length nil
:ic-attributes ic-attributes)
connection client-win server-win)))
((= opcode xim:opcode:set-ic-focus)
(exim--log "SET-IC-FOCUS")
;; All input contexts are the same.
)
((= opcode xim:opcode:unset-ic-focus)
(exim--log "UNSET-IC-FOCUS")
;; All input contexts are the same.
)
((= opcode xim:opcode:forward-event)
(exim--log "FORWARD-EVENT")
(let ((im-func (with-current-buffer (window-buffer) ;essential
input-method-function)) ;save for future use
(obj (make-instance 'xim:forward-event))
key-event event)
(xcb:unmarshal obj data)
;; We do not check the flag slot
;; Convert X key event to Emacs key event
(let ((xcb:lsb xim:lsb)) ;in client's byte-order
(setq key-event (make-instance 'xcb:KeyPress)))
(xcb:unmarshal key-event (slot-value obj 'event))
(with-slots (detail state) key-event
(setq event (xcb:keysyms:keycode->keysym exim--connection detail
state)
event (when (/= 0 (car event))
(xcb:keysyms:keysym->event exim--connection
(car event)
(logand
state
(lognot
(cdr event)))))))
(if exim--event-pending
;; All events should be forwarded to Emacs frame
(when event
(push event unread-command-events))
(setq exim--event-pending t)
(if (or (not im-func) ;no active input method
(eq im-func #'list) ;the default method
(not event) ;invalid key
;; Select only printable keys
(not (integerp event)) (> #x20 event) (< #x7e event))
(with-slots (im-id ic-id serial-number event) obj
(exim--send
(make-instance 'xim:forward-event
:im-id im-id
:ic-id ic-id
:flag xim:commit-flag:synchronous
:serial-number serial-number
:event event)
connection client-win server-win))
(with-temp-buffer ;in case buffer is read-only
(let* ((input-method-use-echo-area t) ;show key strokes
(result (encode-coding-string
(concat (funcall im-func event))
;; Compound text also works for portable
;; character encoding
'compound-text-with-extensions)))
(message "") ;force clear echo area
(exim--send
(make-instance 'xim:commit-x-lookup-chars
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id)
:flag
(logior xim:commit-flag:synchronous
xim:commit-flag:x-lookup-chars)
:length (length result)
:string result)
connection client-win server-win))))
(setq exim--event-pending nil))))
((= opcode xim:opcode:sync)
(exim--log "SYNC")
(let ((obj (make-instance 'xim:sync)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:sync-reply
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id))
connection client-win server-win)))
((= opcode xim:opcode:sync-reply)
(exim--log "SYNC-REPLY"))
((= opcode xim:opcode:reset-ic)
(exim--log "RESET-IC")
;; No context-specific data saved
(let ((obj (make-instance 'xim:reset-ic)))
(xcb:unmarshal obj data)
(exim--send (make-instance 'xim:reset-ic-reply
:im-id (slot-value obj 'im-id)
:ic-id (slot-value obj 'ic-id)
:length 0
:string "")
connection client-win server-win)))
((or (= opcode xim:opcode:str-conversion-reply)
(= opcode xim:opcode:preedit-start-reply)
(= opcode xim:opcode:preedit-caret-reply))
;; No preedit support
(exim--send (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)
connection client-win server-win))
(t
(exim--log "[EXIM] Bad protocol")
(exim--send (make-instance 'xim:error
:im-id 0 :ic-id 0
:flag xim:error-flag:invalid-both
:error-code xim:error-code:bad-protocol
:length 0 :type 0 :detail nil)
connection client-win server-win)))))
(defun exim--send (request connection client-win _server-win)
"Send an XIM request REQUEST via connection CONNECTION."
(let ((data (xcb:marshal request))
event property)
(if (>= 20 (length data))
;; Short request
(progn
(setq event
(make-instance
'xcb:ClientMessage
:format 8
:window client-win
:type exim--_XIM_PROTOCOL
:data (make-instance 'xcb:ClientMessageData
:data8
(append data
(make-list (- 20 (length data))
0)))))
(xcb:+request connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination client-win
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal event connection))))
;; Long request
(setq property (format "_EXIM_%d" exim--property-index)
exim--property-index (1+ exim--property-index)
property (slot-value
(xcb:+request-unchecked+reply connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length property)
:name property))
'atom))
(xcb:+request connection
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Append
:window client-win
:property property
:type xcb:Atom:STRING
:format 8
:data-len (length data)
:data data))
(setq event (make-instance
'xcb:ClientMessage
:format 32
:window client-win
:type exim--_XIM_PROTOCOL
:data (make-instance 'xcb:ClientMessageData
:data32 (list (length data)
property 0 0 0))))
(xcb:+request connection
(make-instance 'xcb:SendEvent
:propagate 0
:destination client-win
:event-mask xcb:EventMask:NoEvent
:event (xcb:marshal event connection))))
(xcb:flush connection)))
(defun exim--on-DestroyNotify (data synthetic)
"Do cleanups on receiving DestroyNotify event."
(unless synthetic
(let ((obj (make-instance 'xcb:DestroyNotify))
client-win server-win connection)
(xcb:unmarshal obj data)
(setq client-win (slot-value obj 'window)
server-win (plist-get exim--internal client-win))
(when server-win
(setq connection (aref (plist-get exim--internal server-win) 0))
(cl-remf exim--internal client-win)
(cl-remf exim--internal server-win)
;; Destroy the communication window
(xcb:+request connection
(make-instance 'xcb:DestroyWindow
:window server-win))
;; Disconnect from the connection
(xcb:disconnect connection)))))
(defun exim-start ()
"Start EXIM."
(unless exim--connection
(add-hook 'kill-emacs-hook #'exim-stop)
(let (atom)
(setq exim--connection (xcb:connect-to-socket)
exim--root (slot-value
(elt (slot-value (xcb:get-setup exim--connection) 'roots)
0)
'root)
exim--window (xcb:generate-id exim--connection)
atom "XIM_SERVERS"
exim--XIM_SERVERS (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)
atom "@server=exim"
exim--server (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)
atom "LOCALES"
exim--LOCALES (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)
atom "TRANSPORT"
exim--TRANSPORT (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)
atom "_XIM_XCONNECT"
exim--_XIM_XCONNECT (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)
atom "_XIM_PROTOCOL"
exim--_XIM_PROTOCOL (slot-value
(xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:InternAtom
:only-if-exists 0
:name-len (length atom)
:name atom))
'atom)))
(set-process-query-on-exit-flag (slot-value exim--connection 'process) nil)
;; Initialize xcb:keysyms
(xcb:keysyms:init exim--connection)
;; Listen to SelectionRequest event for connection establishment
(xcb:+event exim--connection 'xcb:SelectionRequest
#'exim--on-SelectionRequest)
;; Listen to ClientMessage event on IMS window for new XIM connection.
(xcb:+event exim--connection 'xcb:ClientMessage #'exim--on-ClientMessage-0)
;; Listen to DestroyNotify event to do cleanups
(xcb:+event exim--connection 'xcb:DestroyNotify #'exim--on-DestroyNotify)
;; Create an event window
(xcb:+request exim--connection
(make-instance 'xcb:CreateWindow
:depth 0
:wid exim--window
:parent exim--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 exim--connection
(make-instance 'xcb:SetSelectionOwner
:owner exim--window
:selection exim--server
:time xcb:Time:CurrentTime))
;; Set XIM_SERVERS property on the root window
(xcb:+request exim--connection
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Prepend
:window exim--root
:property exim--XIM_SERVERS
:type xcb:Atom:ATOM
:format 32
:data-len 1
:data (funcall (if xcb:lsb
#'xcb:-pack-u4-lsb
#'xcb:-pack-u4)
exim--server)))
(xcb:flush exim--connection)))
(defun exim-stop ()
"Stop EXIM."
;; Close IMS communication connections.
(dolist (i (cl-loop for (key val) on exim--internal by #'cddr
when (and (integerp key) (vectorp val)) collect val))
(xcb:disconnect (elt i 0)))
;; Close the IMS connection.
(when exim--connection
;; Remove EXIM from XIM_SERVERS.
(let ((reply (xcb:+request-unchecked+reply exim--connection
(make-instance 'xcb:GetProperty
:delete 1
:window exim--root
:property exim--XIM_SERVERS
:type xcb:Atom:ATOM
:long-offset 0
:long-length 1000)))
unpack pack tmp)
(when (and reply
(< 4 (length (setq reply (slot-value reply 'value)))))
(setq unpack (if xcb:lsb #'xcb:-unpack-u4-lsb #'xcb:-unpack-u4)
pack (if xcb:lsb #'xcb:-pack-u4-lsb #'xcb:-pack-u4)
reply (vconcat reply))
(dotimes (i (/ (length reply) 4))
(push (funcall unpack reply (* i 4)) tmp))
(setq tmp (delq exim--server tmp)
reply nil)
(dolist (i tmp)
(push (funcall pack i) reply))
(xcb:+request exim--connection
(make-instance 'xcb:ChangeProperty
:mode xcb:PropMode:Replace
:window exim--root
:property exim--XIM_SERVERS
:type xcb:Atom:ATOM
:format 32
:data-len (length reply)
:data reply))
(xcb:flush exim--connection)))
(xcb:disconnect exim--connection)
(setq exim--connection nil)))
(provide 'exim)
;;; exim.el ends here