FIVB Volleyball Women's World Championship qualification (AVC).
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etherpad-esync.el
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etherpad-esync.el
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;;; etherpad-esync.el --- Etherpad easysync protocol -*- coding: utf-8; lexical-binding: t -*-
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;; Copyright 2020 FoAM
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;;
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;; Author: nik gaffney <nik@fo.am>
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;; Created: 2020-12-12
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;; Version: 0.1
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;; Package-Requires: ((emacs "27.1") (request "0.3") (websocket "1.12") (parsec "0.1") (0xc "0.1"))
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;; Keywords: comm, etherpad, collaborative editing
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;; URL: https://github.com/zzkt/ethermacs
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;; This file is not part of GNU Emacs.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Etherpad is a highly customizable Open Source online editor providing
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;; collaborative editing in really real-time.
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;;
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;; The easysync protocol is used for communication of edits, changesets
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;; and metadata between etherpad server and clients. It uses websockets
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;; for the transport layer
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;;
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;; details -> https://etherpad.org/doc/v1.8.5/#index_http_api
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;; current issues 2020-12-15 00:52:32
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;; - one ws per buffer. buffer local. shared.
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;; - incorrect newline counts when sending changesets
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;; - problems w. deleting text and/or changing buffer size & change-hooks
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;; - see "Additional Constraints" of easysync
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;; - potential race conditions sending changesets on buffer changes
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;; - doesn't apply attributes or changes from the apool
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;; - general lack of error checking
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;;; Code:
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(require 'websocket)
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(require 'let-alist)
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(require 'calc-bin)
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(require 'parsec)
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(require '0xc)
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(require 's)
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;; debug details
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(setq websocket-debug t)
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;; local and buffer local variables
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(defvar-local etherpad-esync--pre-buffer-length 0)
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(defvar-local etherpad-esync--new-buffer-length 0)
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(defvar-local etherpad-esync--change-length 0)
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(defvar-local etherpad-esync--change-string "")
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(defvar-local etherpad-esync--local-rev 0)
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(defvar-local etherpad-esync--current-pad "")
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(defvar-local etherpad-esync--local-author "") ;; e.g. "a.touCZaixjPgKDSiN"
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(defvar-local etherpad-esync--hearbeat-timer nil)
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(defvar-local etherpad-esync--current-socket nil)
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;; session
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(defvar etherpad-esync-session-token "") ;; see also *session-token*
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;; buffering
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(defvar etherpad-esync-buffer (generate-new-buffer "*etherpad (easysync)*"))
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;; keep-alive message & heartbeat timers
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(defun etherpad-esync-heartbeat-send ()
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"Send a keep-alive message."
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;; only send if there is a current socket
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;; and delete an active timer when there isn't a socket open
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(message "heartbeat?")
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(when (etherpad-esync-current-socket)
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(etherpad-esync-wss-send "2")
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(message "heartbeat sent: %s" etherpad-esync-buffer))
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(when (not (etherpad-esync-current-socket))
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(etherpad-esync-heartbeat-stop)
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(message "heartbeat stopped: %s" etherpad-esync--hearbeat-timer)))
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(defun etherpad-esync-heartbeat-start ()
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"Maintain connection to server with periodic pings."
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(message "heartbeat started: %s" etherpad-esync-buffer)
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(setq etherpad-esync--hearbeat-timer
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(run-with-timer 5 15 #'etherpad-esync-heartbeat-send))
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(etherpad-esync-current-socket))
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(defun etherpad-esync-heartbeat-stop ()
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"Stop sending keep-alive messages."
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(when etherpad-esync--hearbeat-timer
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(cancel-timer etherpad-esync--hearbeat-timer))
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(setq etherpad-esync--hearbeat-timer nil)
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(message "heartbeat stopped: %s" etherpad-esync-buffer))
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;; sockets
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(defun etherpad-esync-current-socket (&optional socket)
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"Return currently active socket or set SOCKET as current."
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(when socket
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(setq etherpad-esync--current-socket socket))
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(message "current socket: set")
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etherpad-esync--current-socket)
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;; setters
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(defun etherpad-esync--set-local-rev (n)
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"Set the local revision to N."
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(message "current rev: %s" etherpad-esync--local-rev)
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(setq etherpad-esync--local-rev n)
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(message "updated rev: %s" etherpad-esync--local-rev)
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(with-current-buffer etherpad-esync-buffer
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(rename-buffer (format "etherpad:%s:%s"
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etherpad-esync--current-pad
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etherpad-esync--local-rev))))
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;; see also -> inhibit-modification-hooks
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(defun etherpad-esync--add-change-hooks ()
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"Add predefined change hooks."
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(interactive)
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(message "setting up buffer change hooks")
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(with-current-buffer etherpad-esync-buffer
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(add-hook 'before-change-functions
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'etherpad-esync--before-buffer-changes nil t)
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;; ordering is important...
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(add-hook 'after-change-functions
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'etherpad-esync--after-buffer-changes 22 t)
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(add-hook 'after-change-functions
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'etherpad-esync--send-changes 23 t)))
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(defun etherpad-esync--remove-change-hooks ()
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"Remove predefined change hooks."
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(interactive)
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(message "removing buffer change hooks")
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(with-current-buffer etherpad-esync-buffer
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(remove-hook 'before-change-functions
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'etherpad-esync--before-buffer-changes t)
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(remove-hook 'after-change-functions
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'etherpad-esync--after-buffer-changes t)
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(remove-hook 'after-change-functions
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'etherpad-esync--send-changes t)))
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(defun etherpad-esync--before-buffer-changes (begin end)
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"Length before buffer is synced. BEGIN END."
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;; (message "before -> b:%s e:%s" begin end)
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(setq-local etherpad-esync--pre-buffer-length (length (buffer-string))
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etherpad-esync--change-length (- end begin)))
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(defun etherpad-esync--after-buffer-changes (begin end _pre)
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"Length after buffer is synced. BEGIN END."
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;; (message "after -> b:%s e:%s p:%s" begin end pre)
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(setq-local etherpad-esync--new-buffer-length (length (buffer-string))
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etherpad-esync--change-string (buffer-substring begin end)
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etherpad-esync--change-length (- end begin)))
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;; (message "eabc: pre: %s post: %s changed: %s chars to: %s at: %s(%s)"
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;; etherpad-esync--pre-buffer-length
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;; etherpad-esync--new-buffer-length
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;; etherpad-esync--change-length
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;; etherpad-esync--change-string
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;; (point)
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;; (n-36 (point))))
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;; emacs -> etherpad changes
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(defun etherpad-esync--send-changes (_b _e _p)
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"Create and encode a changeset."
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(let* ((b0 etherpad-esync--pre-buffer-length)
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(b1 etherpad-esync--new-buffer-length)
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(ops (if (< b0 b1)
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(format "+%s" (- b1 b0))
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(format "-%s" (- b0 b1))))
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(changeset
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(etherpad-esync--encode-changeset
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b0
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(- b1 b0)
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ops
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etherpad-esync--change-string)))
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(message "changeset: %s" changeset)
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(etherpad-esync--send-user-changes changeset)))
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(defun etherpad-esync--encode-changeset (length change-size ops chars)
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"Create a changeset from some buffer activity. LENGTH CHANGE-SIZE OPS CHARS."
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(cl-flet ((n-36 (number)
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;; Convert a decimal NUMBER to base-36 as string.
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(let ((calc-number-radix 36))
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(downcase (math-format-radix number)))))
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(message "encoding: o:%s (%s) cs:%s op:%s ch:%s"
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length (n-36 length)
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change-size ops chars)
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(let* ((change (cond ((= 0 change-size) "=0")
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((> 0 change-size)
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(format "<%s" (n-36 (abs change-size))))
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((< 0 change-size)
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(format ">%s" (n-36 change-size)))))
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(newline-count (s-count-matches "\n" (buffer-substring
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(point-min)
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(point))))
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(offset (- (point) (length chars) 1))
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;; offset is distance from point-min to point w.out inserted chars and w. newlines
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(pos-op (if (< 0 newline-count)
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(format "|%s=%s"
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;; 2 steps reqd. newline insert, then from beginning of line?
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(n-36 newline-count)
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(let ((p1 (- offset
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(caar
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(reverse
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(s-matched-positions-all
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"\n" (buffer-substring
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(point-min) (point))))))))
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(message "offset: %s p1: %s" offset p1)
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(if (= 1 p1)
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(n-36 (+ 1 offset))
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(format "%s=%s"
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(n-36 (- offset p1 -1))
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(n-36 (- p1 1))))))
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(format "=%s" (n-36 offset)))))
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(format "Z:%s%s%s%s$%s" (n-36 length) change pos-op ops chars))))
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(defun etherpad-esync--send-user-changes (cs)
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"Send a `USER_CHANGES' message with changeset CS."
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(let* ((author etherpad-esync--local-author)
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(rev etherpad-esync--local-rev)
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(changeset cs)
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(payload
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(format "42[\"message\",{\"type\":\"COLLABROOM\",\"component\":\"pad\",\"data\":{\"type\":\"USER_CHANGES\",\"baseRev\":%s,\"changeset\":\"%s\",\"apool\":{\"numToAttrib\":{},\"nextNum\":1}}}]"
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rev changeset))) ;; author?
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(message "send this (as %s) -> %s" payload author)
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(etherpad-esync-wss-send payload)))
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;; parsec info https://github.com/cute-jumper/parsec.el
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(defun etherpad-esync-parse-changeset (cs)
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"Parse a changeset CS.
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:N : Source text has length N (must be first op)
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>N : Final text is N (positive) characters longer than source text (must be second op)
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<N : Final text is N (positive) characters shorter than source text (must be second op)
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>0 : Final text is same length as source text
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+N : Insert N characters from the bank, none of them newlines
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-N : Skip over (delete) N characters from the source text, none of them newlines
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=N : Keep N characters from the source text, none of them newlines
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|L+N : Insert N characters from the source text, containing L newlines. The last
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character inserted MUST be a newline, but not the (new) document's final newline.
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|L-N : Delete N characters from the source text, containing L newlines. The last
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character inserted MUST be a newline, but not the (old) document's final newline.
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|L=N : Keep N characters from the source text, containing L newlines. The last character
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kept MUST be a newline, and the final newline of the document is allowed.
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*I : Apply attribute I from the pool to the following +, =, |+, or |= command.
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In other words, any number of * ops can come before a +, =, or | but not
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between a | and the corresponding + or =.
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If +, text is inserted having this attribute. If =, text is kept but with
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the attribute applied as an attribute addition or removal.
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Consecutive attributes must be sorted lexically by (key,value) with key
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and value taken as strings. It's illegal to have duplicate keys
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for (key,value) pairs that apply to the same text. It's illegal to
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have an empty value for a key in the case of an insertion (+), the
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pair should just be omitted."
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(let* ((changes
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(parsec-with-input cs
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;; a letter Z (the "magic character" and format version identifier)
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(parsec-str "Z")
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(parsec-collect*
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;; source text length
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(parsec-re ":[0-9a-z]+")
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;; change in text length
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(parsec-re "[>=<][0-9a-z]+")
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;; insertion & deletion operations
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(parsec-many
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(parsec-or
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(parsec-re "|[0-9a-z]+[+-=][0-9a-z]+")
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(parsec-re "[><+-=*][0-9a-z]+")))
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;; separator
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(parsec-str "$")
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;; a string of characters used by insertion operations (the "char bank")
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(parsec-many-s
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(parsec-any-ch))))))
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(let* ((old-length
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(0xc-string-to-number (substring (car changes) 1) 36))
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(change-sign
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(if (s-equals? ">" (substring (nth 1 changes) 0 1)) 1 -1))
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(change-size
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(0xc-string-to-number (substring (nth 1 changes) 1) 36))
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(new-length
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(+ old-length (* change-sign change-size)))
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(ops
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(nth 2 changes))
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(chars
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(car (last changes))))
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(message "old length: %s new length: %s ops: %s" old-length new-length ops)
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(list old-length ops chars))))
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;; operations -> buffer changes
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(defun etherpad-esync-apply-ops (ops chars)
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"Apply a series of insert/delete OPS using CHARS.
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Numeric offsets are calculated from the beginning of the buffer."
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(with-current-buffer etherpad-esync-buffer
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(save-mark-and-excursion
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(goto-char (point-min))
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(cl-flet
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;; Convert a base-36 number STRING to decimal.
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((s-36 (string)
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(0xc-string-to-number string 36)))
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(let ((char-bank chars))
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(mapcar
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(lambda (s)
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(let* ((o1 (s-left 1 s))
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(p1 (substring s 1)))
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(message "op: %s val: %s" o1 p1)
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(pcase o1
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("+" (etherpad-esync-insert (s-left (s-36 p1) char-bank))
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(setq char-bank (s-right (s-36 p1) char-bank)))
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("-" (etherpad-esync-delete (s-36 p1)))
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("=" (etherpad-esync-keep (s-36 p1)))
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("|" (let* ((p2 (s-split "[+=-]" p1))
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(l1 (s-36 (car p2)))
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(n1 (s-36 (cadr p2))))
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;; doesn't insert or delete newlines correctly (yet)
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(message "op: | → l1: %s n1: %s" l1 n1)
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(pcase p1
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((pred (s-matches? "+"))
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(etherpad-esync-insert (make-string n1 10)))
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((pred (s-matches? "-")) (etherpad-esync-delete n1))
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((pred (s-matches? "=")) (etherpad-esync-keep n1)))))
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("*" t)
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(_ nil))))
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ops))))))
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;; character operations for remote->local sync
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;; which should not trigger change hooks
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(defun etherpad-esync-insert (chars)
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"Insert CHARS into the source text."
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(let ((inhibit-modification-hooks t))
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(insert chars)))
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(defun etherpad-esync-delete (n)
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"Delete (skip over) N chars from the source text."
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(let ((inhibit-modification-hooks t))
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(delete-char n)))
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(defun etherpad-esync-keep (n)
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"Keep N chars from the source text."
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(let ((inhibit-modification-hooks t))
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(forward-char n)))
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;; start with current pad text
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(defun etherpad-esync-init-text (chars)
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"Seeds a buffer with CHARS from a remote pad."
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(with-current-buffer etherpad-esync-buffer
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(let ((inhibit-modification-hooks t))
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(erase-buffer)
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(goto-char (point-min))
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(insert chars))))
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(defun etherpad-esync-try-changeset (cs)
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(let* ((changes
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(etherpad-esync-parse-changeset cs))
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(len (nth 0 changes))
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(ops (nth 1 changes))
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(chars (nth 2 changes)))
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(etherpad-esync--check-length len)
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(etherpad-esync-apply-ops ops chars)))
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(defun etherpad-esync--check-length (size)
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"Check the changeset and buffer SIZE are consistent."
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(when (not (= size (length (buffer-string))))
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(message "changeset and buffer length are inconsistent.")))
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;; various stanzas
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(defun etherpad-esync--request-client-ready (padId)
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"Ethersync: send CLIENT_READY for PADID."
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(format "42[\"message\",{\"component\":\"pad\",\"type\":\"CLIENT_READY\",\"padId\":\"%s\",\"token\":\"%s\",\"protocolVersion\":2}]" padId etherpad-esync-session-token))
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(defun etherpad-esync--request-get-comments (padId)
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"Ethersync: request comments on PADID."
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(format "42/comment,0[\"getComments\",{\"padId\":\"%s\"}]" padId))
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(defun etherpad-esync--request-get-comment-replies (padId)
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"Ethersync: request comment replies on PADID."
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(format "42/comment,1[\"getCommentReplies\",{\"padId\":\"%s\"}]" padId))
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;; sending via websockets
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(defun etherpad-esync-wss-send (msg)
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"Send MSG to a websocket."
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(if (websocket-openp (etherpad-esync-current-socket))
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(when (stringp msg)
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(websocket-send-text
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(etherpad-esync-current-socket) msg))
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(message "websocket is closed. not sending: %s" msg)))
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|
||||
;; parsing & dispatch of incoming frames
|
||||
|
||||
(defun etherpad-esync-parse-wsframe (_websocket frame)
|
||||
"Parse & dispatch incoming FRAME.
|
||||
Parsing occurs `with-current-buffer' for constancy with buffer-local variables
|
||||
use let bindings for multiple connections."
|
||||
;; (message "parsing: %s" frame)
|
||||
(with-current-buffer etherpad-esync-buffer
|
||||
(let* ((fr0 (websocket-frame-text frame))
|
||||
(frp (parsec-with-input
|
||||
fr0
|
||||
(parsec-collect* (parsec-re "[0-9]+")
|
||||
(parsec-many-s (parsec-any-ch))))))
|
||||
(message "frame: %s" (length fr0))
|
||||
(when (= 2 (length fr0))
|
||||
(message "frame: %s" fr0))
|
||||
(pcase (car frp)
|
||||
("0" (etherpad-esync--parse-0 frp))
|
||||
("2" (etherpad-esync--parse-2 frp))
|
||||
("3" (message "3: keep-alive"))
|
||||
("40" (etherpad-esync--parse-40 frp))
|
||||
("42" (etherpad-esync--parse-42 frp))))))
|
||||
|
||||
|
||||
;; parse various incoming message types
|
||||
|
||||
(defun etherpad-esync--parse-0 (p0)
|
||||
"Parse messages beginning with 0 from P0.
|
||||
set sid, upgrades, pingInterval and pingTimeout for session."
|
||||
(when (listp p0)
|
||||
(pcase (length p0)
|
||||
(0 nil)
|
||||
(1 (car p0))
|
||||
(_ (let* ((p1 (json-parse-string (nth 1 p0) :object-type 'alist))
|
||||
(sid (alist-get 'sid p1)))
|
||||
(message "sid %s" sid))))))
|
||||
|
||||
|
||||
(defun etherpad-esync--parse-2 (p0)
|
||||
"Parse messages beginning with 2 from P0.
|
||||
set revisions etc."
|
||||
(when (listp p0)
|
||||
(pcase (length p0)
|
||||
(0 nil)
|
||||
(1 (car p0))
|
||||
(_ (let* ((p1 (json-parse-string (nth 1 p0) :object-type 'alist)))
|
||||
(let-alist (aref p1 1)
|
||||
(pcase .type
|
||||
("COLLABROOM"
|
||||
(pcase .data.type
|
||||
("ACCEPT_COMMIT"
|
||||
(message "accepted changes: rev:%s"
|
||||
.data.newRev)
|
||||
(etherpad-esync--set-local-rev .data.newRev)))))))))))
|
||||
|
||||
|
||||
(defun etherpad-esync--parse-40 (p0)
|
||||
"Parse messages beginning with 40 from P0.
|
||||
comments and comment threads."
|
||||
(message "40: comments: %s" p0))
|
||||
|
||||
|
||||
(defun etherpad-esync--parse-42 (p0)
|
||||
"Parse messages beginning with 42 from P0.
|
||||
most of the COLLABROOM and update stuff..."
|
||||
(when (listp p0)
|
||||
(pcase (length p0)
|
||||
(0 nil)
|
||||
(1 (car p0))
|
||||
(_ (let* ((p1 (json-parse-string (nth 1 p0) :object-type 'alist)))
|
||||
(let-alist (aref p1 1)
|
||||
(pcase .type
|
||||
("COLLABROOM"
|
||||
(pcase .data.type
|
||||
|
||||
("USER_NEWINFO"
|
||||
(message "42: new user %s (color %s)"
|
||||
.data.userInfo.userId
|
||||
.data.userInfo.colorId))
|
||||
|
||||
("NEW_CHANGES"
|
||||
(message "42: new_changes rev:%s changeset:%s (by %s)"
|
||||
.data.newRev
|
||||
.data.changeset
|
||||
.data.author)
|
||||
(etherpad-esync--set-local-rev .data.newRev)
|
||||
(etherpad-esync-try-changeset .data.changeset))
|
||||
|
||||
("USER_CHANGES"
|
||||
(message "42: user_changes rev:%s changeset:%s (by %s)"
|
||||
.data.baseRev
|
||||
.data.changeset
|
||||
.data.apool.author))
|
||||
|
||||
("ACCEPT_COMMIT"
|
||||
(message "42: accept-commit rev:%s" .data.newRev)
|
||||
(etherpad-esync--set-local-rev .data.newRev))))
|
||||
|
||||
("CLIENT_READY"
|
||||
(message "42: ready -> %s and %s" .padId .token))
|
||||
|
||||
("CLIENT_VARS"
|
||||
(message "42: client_vars (%s) rev:%s -> %s"
|
||||
.data.padId
|
||||
.data.collab_client_vars.rev
|
||||
.data.collab_client_vars.initialAttributedText.text)
|
||||
(etherpad-esync--set-local-rev
|
||||
.data.collab_client_vars.rev)
|
||||
(etherpad-esync-init-text
|
||||
.data.collab_client_vars.initialAttributedText.text)))
|
||||
|
||||
(pcase .disconnect
|
||||
("badChangeset"
|
||||
(message "42: disconnect (%s)" .disconnect)))))))))
|
||||
|
||||
|
||||
(provide 'etherpad-esync)
|
||||
|
||||
;;; etherpad-esync.el ends here
|
Loading…
Reference in a new issue