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ement-room.el
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ement-room.el
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;;; ement-room.el --- Ement room buffers -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Adam Porter
;; Author: Adam Porter <adam@alphapapa.net>
;; Keywords: comm
;; This program 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 program 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 program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; EWOC is a great library. If I had known about it and learned it
;; sooner, it would have saved me a lot of time in other projects.
;; I'm glad I decided to try it for this one.
;;; Code:
;;;; Debugging
(eval-and-compile
(setq-local warning-minimum-log-level nil)
(setq-local warning-minimum-log-level :debug))
;;;; Requirements
(require 'color)
(require 'ewoc)
(require 'mailcap)
(require 'shr)
(require 'subr-x)
(require 'mwheel)
(require 'ement-api)
(require 'ement-macros)
(require 'ement-structs)
;;;; Variables
(defvar-local ement-ewoc nil
"EWOC for Ement room buffers.")
(defvar-local ement-room nil
"Ement room for current buffer.")
(defvar-local ement-session nil
"Ement session for current buffer.")
(defvar-local ement-room-retro-loading nil
"Non-nil when earlier messages are being loaded.
Used to avoid overlapping requests.")
(defvar-local ement-room-replying-to-event nil
"When non-nil, the user is replying to this event.
Used by `ement-room-send-message'.")
(defvar-local ement-room-replying-to-overlay nil
"Used by ement-room-send-reply.")
(defvar ement-room-compose-hook nil
"Hook run in compose buffers when created.
Used to, e.g. call `ement-room-compose-org'.")
(declare-function ement-view-room "ement.el")
(declare-function ement-room-list "ement-room-list.el")
(declare-function ement-notify-switch-to-mentions-buffer "ement-notify")
(declare-function ement-notify-switch-to-notifications-buffer "ement-notify")
(defvar ement-room-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "a") #'ement-room-send-reaction)
(define-key map (kbd "e") #'ement-room-send-emote)
(define-key map (kbd "g") #'ement-room-sync)
(define-key map (kbd "r") #'ement-view-room)
(define-key map (kbd "R") #'ement-room-list)
(define-key map (kbd "q") #'quit-window)
(define-key map (kbd "v") #'ement-room-view-event)
(define-key map (kbd "RET") #'ement-room-send-message)
(define-key map (kbd "SPC") #'ement-room-scroll-up-mark-read)
(define-key map (kbd "S-SPC") #'ement-room-scroll-down-command)
(define-key map (kbd "M-SPC") #'ement-room-goto-fully-read-marker)
(define-key map (kbd "S-<return>") #'ement-room-send-reply)
(define-key map (kbd "<backtab>") #'ement-room-goto-prev)
(define-key map (kbd "TAB") #'ement-room-goto-next)
(define-key map (kbd "C-k") #'ement-room-delete-message)
(define-key map [remap scroll-down-command] #'ement-room-scroll-down-command)
(define-key map [remap mwheel-scroll] #'ement-room-mwheel-scroll)
(define-key map (kbd "M-g M-l") #'ement-room-list)
(define-key map (kbd "M-g M-m") #'ement-notify-switch-to-mentions-buffer)
(define-key map (kbd "M-g M-n") #'ement-notify-switch-to-notifications-buffer)
map)
"Keymap for Ement room buffers.")
(defvar ement-room-minibuffer-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map minibuffer-local-map)
(define-key map (kbd "C-c '") #'ement-room-compose-from-minibuffer)
map)
"Keymap used in `ement-room-read-string'.")
(defvar ement-room-sender-in-headers nil
"Non-nil when sender is displayed in the left margin.
In that case, sender names are aligned to the margin edge.")
(defvar ement-room-messages-filter
'((lazy_load_members . t))
;; NOTE: The confusing differences between what /sync and /messages
;; expect. See <https://github.com/matrix-org/matrix-doc/issues/706>.
"Default RoomEventFilter for /messages requests.")
(defvar ement-room-typing-timer nil
"Timer used to send notifications while typing.")
;; Variables from other files.
(defvar ement-sessions)
(defvar ement-users)
(defvar ement-notify-limit-room-name-width)
;;;; Customization
(defgroup ement-room nil
"Options for room buffers."
:group 'ement)
;;;;; Faces
(defface ement-room-name
'((t (:inherit font-lock-function-name-face)))
"Room name shown in header line.")
(defface ement-room-membership
'((t (:height 0.8 :inherit font-lock-comment-face)))
"Membership events (join/part).")
(defface ement-room-reactions
'((t (:inherit font-lock-comment-face :height 0.9)))
"Reactions to messages (including the user count).")
(defface ement-room-reactions-key
'((t (:inherit ement-room-reactions :height 1.5)))
"Reactions to messages (the key, i.e. the emoji part).
Uses a separate face to allow the key to be shown at a different
size, because in some fonts, emojis are too small relative to
normal text.")
(defface ement-room-timestamp
'((t (:inherit font-lock-comment-face)))
"Event timestamps.")
(defface ement-room-user
'((t (:inherit font-lock-function-name-face :weight bold :overline t)))
"Usernames.")
(defface ement-room-self
'((t (:inherit (font-lock-variable-name-face ement-room-user) :weight bold)))
"Own username.")
(defface ement-room-message-text
'((t (:inherit default)))
"Text message bodies.")
(defface ement-room-message-emote
'((t (:inherit italic)))
"Emote message bodies.")
(defface ement-room-self-message
'((t (:inherit (font-lock-variable-name-face))))
"Oneself's message bodies.
Note that this does not need to inherit
`ement-room-message-text', because that face is combined with
this one automatically.")
(defface ement-room-timestamp-header
'((t (:inherit header-line :weight bold :height 1.1)))
"Timestamp headers.")
(defface ement-room-mention
(if (version< emacs-version "27.1")
'((t (:inverse-video t)))
'((t (:inverse-video t :extend t))))
"Messages that mention the local user.")
;;;;; Options
(defcustom ement-room-ellipsis "⋮"
"String used when abbreviating certain strings."
:type 'string)
(defcustom ement-room-avatars t
"Show room avatars."
:type 'boolean)
(defcustom ement-room-avatar-max-width 32
"Maximum width in pixels of room avatars shown in header lines."
:type 'integer)
(defcustom ement-room-avatar-max-height 32
"Maximum height in pixels of room avatars shown in header lines."
:type 'integer)
(defcustom ement-room-header-line-format
;; TODO: Show in new screenshots.
'(:eval (concat (if ement-room-avatars
(or (ement-room-avatar ement-room)
"")
"")
" " (propertize (ement-room--escape-%
(or (ement-room-display-name ement-room)
"[no room name]"))
'face 'ement-room-name)
": " (propertize (ement-room--escape-%
(or (ement-room-topic ement-room)
"[no topic]"))
;; Also set help-echo in case the topic is too wide to fit.
'help-echo (ement-room-topic ement-room))))
"Header line format for room buffers.
See Info node `(elisp)Header lines'."
:type 'sexp)
(put 'ement-room-header-line-format 'risky-local-variable t)
(defcustom ement-room-buffer-name-prefix "*Ement Room: "
"Prefix for Ement room buffer names."
:type 'string)
(defcustom ement-room-buffer-name-suffix "*"
"Suffix for Ement room buffer names."
:type 'string)
(defcustom ement-room-timestamp-format "%H:%M:%S"
"Format string for event timestamps.
See function `format-time-string'."
:type '(choice (const "%H:%M:%S")
(const "%Y-%m-%d %H:%M:%S")
string))
(defcustom ement-room-left-margin-width 0
"Width of left margin in room buffers.
When using a non-graphical display, this should be set slightly
wider than when using a graphical display, to prevent sender
display names from colliding with event text."
:type 'integer)
(defcustom ement-room-right-margin-width (length ement-room-timestamp-format)
"Width of right margin in room buffers."
:type 'integer)
(defcustom ement-room-sender-headers t
"Show sender headers.
Automatically set by setting `ement-room-message-format-spec',
but may be overridden manually."
:type 'boolean)
(defun ement-room-message-format-spec-setter (option value &optional local)
"Set relevant options for `ement-room-message-format-spec', which see.
To be used as that option's setter. OPTION and VALUE are
received from setting the customization option. If LOCAL is
non-nil, set the variables buffer-locally (i.e. when called from
`ement-room-set-message-format'."
(cl-macrolet ((set-vars (&rest pairs)
;; Set variable-value pairs, locally if LOCAL is non-nil.
`(progn
,@(cl-loop for (symbol value) on pairs by #'cddr
collect `(if local
(set (make-local-variable ',symbol) ,value)
(set ',symbol ,value))))))
(if local
(set (make-local-variable option) value)
(set-default option value))
(pcase value
;; Try to set the margin widths smartly.
("%B%r%R%t" ;; "Elemental"
(set-vars ement-room-left-margin-width 0
ement-room-right-margin-width 8
ement-room-sender-headers t
ement-room-sender-in-headers t))
("%S%L%B%r%R%t" ;; "IRC-style using margins"
(set-vars ement-room-left-margin-width 12
ement-room-right-margin-width 8
ement-room-sender-headers nil
ement-room-sender-in-headers nil))
("[%t] %S> %B%r" ;; "IRC-style without margins"
(set-vars ement-room-left-margin-width 0
ement-room-right-margin-width 0
ement-room-sender-headers nil
ement-room-sender-in-headers nil))
(_ (set-vars ement-room-left-margin-width
(if (string-match-p "%L" value)
12 0)
ement-room-right-margin-width
(if (string-match-p "%R" value)
8 0)
ement-room-sender-headers
(if (string-match-p "%S" value)
nil t)
ement-room-sender-in-headers
(if (string-match-p (rx (1+ anything) "%S" (1+ anything) "%L") value)
t nil))
(message "Ement: When using custom message format, setting margin widths may be necessary")))
(unless ement-room-sender-in-headers
;; HACK: Disable overline on sender face.
(require 'face-remap)
(if local
(progn
(face-remap-reset-base 'ement-room-user)
(face-remap-add-relative 'ement-room-user '(:overline nil)))
(set-face-attribute 'ement-room-user nil :overline nil)))
(unless local
(when (and (bound-and-true-p ement-sessions) (car ement-sessions))
;; Only display when a session is connected (not sure why `bound-and-true-p'
;; is required to avoid compilation warnings).
(message "Ement: Kill and reopen room buffers to display in new format")))))
(defcustom ement-room-message-format-spec "%S%L%B%r%R%t"
"Format messages according to this spec.
It may contain these specifiers:
%L End of left margin
%R Start of right margin
%b Message body (plain-text)
%B Message body (formatted if available)
%i Event ID
%O Room display name (used for mentions buffer)
%r Reactions
%s Sender ID
%S Sender display name
%t Event timestamp, formatted according to
`ement-room-timestamp-format'
Note that margin sizes must be set manually with
`ement-room-left-margin-width' and
`ement-room-right-margin-width'."
:type '(choice (const :tag "IRC-style using margins" "%S%L%B%r%R%t")
(const :tag "IRC-style without margins" "[%t] %S> %B%r")
(const :tag "Elemental" "%B%r%R%t")
(string :tag "Custom format"))
:set #'ement-room-message-format-spec-setter
:set-after '(ement-room-left-margin-width ement-room-right-margin-width
ement-room-sender-headers)
;; This file must be loaded before calling the setter to define the
;; `ement-room-user' face used in it.
:require 'ement-room)
(defcustom ement-room-retro-messages-number 30
"Number of messages to retrieve when loading earlier messages."
:type 'integer)
(defcustom ement-room-timestamp-header-format " %H:%M "
"Format string for timestamp headers where date is unchanged.
See function `format-time-string'. If this string ends in a
newline, its background color will extend to the end of the
line."
:type '(choice (const :tag "Time-only" " %H:%M ")
(const :tag "Always show date" " %Y-%m-%d %H:%M ")
string))
(defcustom ement-room-timestamp-header-with-date-format " %Y-%m-%d (%A) %H:%M\n"
;; FIXME: In Emacs 27+, maybe use :extend t instead of adding a newline.
"Format string for timestamp headers where date changes.
See function `format-time-string'. If this string ends in a
newline, its background color will extend to the end of the
line."
:type '(choice (const " %Y-%m-%d (%A) %H:%M\n")
string))
(defcustom ement-room-replace-edited-messages t
"Replace edited messages with their new content.
When nil, edited messages are displayed as new messages, leaving
the original messages visible."
:type 'boolean)
(defcustom ement-room-prism 'name
"Display users' names and messages in unique colors."
:type '(choice (const :tag "Name only" name)
(const :tag "Name and message" both)
(const :tag "Neither" nil)))
(defcustom ement-room-prism-addressee t
"Show addressees' names in their respective colors.
Applies to room member names at the beginning of messages,
preceded by a colon or comma.
Note that a limitation applies to the current implementation: if
a message from the addressee is not yet visible in a room at the
time the addressed message is formatted, the color may not be
applied."
;; FIXME: When we keep a hash table of members in a room, make this
;; smarter.
:type 'boolean)
(defcustom ement-room-prism-color-adjustment 0
"Number used to tweak computed username colors.
This may be used to adjust your favorite users' colors if you
don't like the default ones. (The only way to do it is by
experimentation--there is no direct mapping available, nor a
per-user setting.)
The number is added to the hashed user ID before converting it to
a color. Note that, since user ID hashes are ratioed against
`most-positive-fixnum', this number must be very large in order
to have any effect; it should be at least 1e13.
After changing this option, a room's buffer must be killed and
recreated to see the effect."
:type 'number
:set (lambda (option value)
(unless (or (= 0 value) (>= value 1e13))
(user-error "This option must be a very large number, at least 1e13"))
(set-default option value)))
(defcustom ement-room-prism-minimum-contrast 6
"Attempt to enforce this minimum contrast ratio for user faces.
This should be a reasonable number from, e.g. 0-7 or so."
;; Prot would almost approve of this default. :) I would go all the way
;; to 7, but 6 already significantly dilutes the colors in some cases.
:type 'number)
(defcustom ement-room-username-display-property '(raise -0.25)
"Display property applied to username strings.
See Info node `(elisp)Other Display Specs'."
:type '(choice (list :tag "Raise" (const raise :tag "Raise") (number :tag "Factor"))
(list :tag "Height" (const height)
(choice (list :tag "Larger" (const + :tag "Larger") (number :tag "Steps"))
(list :tag "Smaller" (const - :tag "Smaller") (number :tag "Steps"))
(number :tag "Factor")
(function :tag "Function")
(sexp :tag "Form"))) ))
(defcustom ement-room-event-separator-display-property '(space :ascent 50)
"Display property applied to invisible space string after events.
Allows visual separation between events without, e.g. inserting
newlines.
See Info node `(elisp)Specified Space'."
:type 'sexp)
(defcustom ement-room-timestamp-header-delta 600
"Show timestamp header where events are at least this many seconds apart."
:type 'integer)
(defcustom ement-room-send-message-filter nil
"Function through which to pass message content before sending.
Used to, e.g. send an Org-formatted message by exporting it to
HTML first."
:type '(choice (const :tag "Send messages as-is" nil)
(const :tag "Send messages in Org format" ement-room-send-org-filter)
(function :tag "Custom filter function"))
:set (lambda (option value)
(set-default option value)
(pcase value
('ement-room-send-org-filter
;; Activate in compose buffer by default.
(add-hook 'ement-room-compose-hook #'ement-room-compose-org))
(_ (remove-hook 'ement-room-compose-hook #'ement-room-compose-org)))))
(defcustom ement-room-mark-rooms-read t
"Mark rooms as read automatically.
Moves read and fully-read markers in rooms on the server when
`ement-room-scroll-up-mark-read' is called at the end of a
buffer. When `send', also marks room as read when sending a
message in it. When disabled, rooms may still be marked as read
manually by calling `ement-room-mark-read'. Note that this is
not strictly the same as read receipts."
:type '(choice (const :tag "When scrolling past end of buffer" t)
(const :tag "Also when sending" send)
(const :tag "Never" nil)))
(defcustom ement-room-send-typing t
"Send typing notifications to the server while typing a message."
:type 'boolean)
(defcustom ement-room-join-view-buffer t
"View room buffer when joining a room."
:type 'boolean)
(defcustom ement-room-leave-kill-buffer t
"Kill room buffer when leaving a room.
When disabled, the room's buffer will remain open, but
Matrix-related commands in it will fail."
:type 'boolean)
;; Other function declarations (seems better to have them all in one place, otherwise they
;; litter the code).
(declare-function ement--events-equal-p "ement")
;;;; Macros
(defmacro ement-room-with-highlighted-event-at (position &rest body)
"Highlight event at POSITION while evaluating BODY."
;; MAYBE: Accept a marker for POSITION.
(declare (indent 1))
`(let* ((node (ewoc-locate ement-ewoc ,position))
(event (ewoc-data node))
ement-room-replying-to-event ement-room-replying-to-overlay)
(unless (and (ement-event-p event)
(ement-event-id event))
(error "No event at point"))
(unwind-protect
(progn
(setf ement-room-replying-to-event event
ement-room-replying-to-overlay
(make-overlay (ewoc-location node)
;; NOTE: It doesn't seem possible to get the end position of
;; a node, so if there is no next node, we use point-max.
;; But this might break if we were to use an EWOC footer.
(if (ewoc-next ement-ewoc node)
(ewoc-location (ewoc-next ement-ewoc node))
(point-max))))
(overlay-put ement-room-replying-to-overlay 'face 'highlight)
,@body)
(when (overlayp ement-room-replying-to-overlay)
(delete-overlay ement-room-replying-to-overlay))
(setf ement-room-replying-to-event nil
ement-room-replying-to-overlay nil))))
(defmacro ement-room-with-typing (&rest body)
"Send typing notifications around BODY.
When `ement-room-send-typing' is enabled, typing notifications
are sent while BODY is executing. BODY is wrapped in an
`unwind-protect' form that cancels `ement-room-typing-timer' and
sends a not-typing notification."
(declare (indent defun))
`(unwind-protect
(progn
(when ement-room-send-typing
(when ement-room-typing-timer
;; In case there are any stray ones (e.g. a user typing in
;; more than room at once, which is possible but unlikely).
(cancel-timer ement-room-typing-timer))
(setf ement-room-typing-timer (run-at-time nil 15 #'ement-room--send-typing ement-session ement-room)))
,@body)
(when ement-room-send-typing
(when ement-room-typing-timer
(cancel-timer ement-room-typing-timer)
(setf ement-room-typing-timer nil))
;; Cancel typing notifications after sending a message. (The
;; spec doesn't say whether this is needed, but it seems to be.)
(ement-room--send-typing ement-session ement-room :typing nil))))
;;;;; Event formatting
;; NOTE: When adding specs, also add them to docstring
;; for `ement-room-message-format-spec'.
(defvar ement-room-event-formatters nil
"Alist mapping characters to event-formatting functions.
Each function is called with three arguments: the event, the
room, and the session. See macro
`ement-room-define-event-formatter'.")
(defvar ement-room--format-message-margin-p nil
"Set by margin-related event formatters.")
(defmacro ement-room-define-event-formatter (char docstring &rest body)
"Define an event formatter for CHAR with DOCSTRING and BODY.
BODY is wrapped in a lambda form that binds `event', `room', and
`session', and the lambda is added to the variable
`ement-room-event-formatters', which see."
(declare (indent defun))
`(setf (alist-get ,char ement-room-event-formatters nil nil #'equal)
(lambda (event room session)
,docstring
,@body)))
(ement-room-define-event-formatter ?L
"Text before this is shown in the left margin."
(ignore event room session)
(setf ement-room--format-message-margin-p t)
(propertize " " 'left-margin-end t))
(ement-room-define-event-formatter ?R
"Text after this is shown in the right margin."
(ignore event room session)
(setf ement-room--format-message-margin-p t)
(propertize " " 'right-margin-start t))
(ement-room-define-event-formatter ?b
"Plain-text body content."
;; NOTE: `save-match-data' is required around calls to `ement-room--format-message-body'.
(let ((body (save-match-data
(ement-room--format-message-body event :formatted-p nil)))
(face (ement-room--event-body-face event room session)))
(add-face-text-property 0 (length body) face 'append body)
(when ement-room-prism-addressee
(ement-room--add-member-face body room))
body))
(ement-room-define-event-formatter ?B
"Formatted body content (i.e. rendered HTML)."
(let ((body (save-match-data
(ement-room--format-message-body event)))
(face (ement-room--event-body-face event room session)))
(add-face-text-property 0 (length body) face 'append body)
(when ement-room-prism-addressee
(ement-room--add-member-face body room))
body))
(ement-room-define-event-formatter ?i
"Event ID."
;; Probably only useful for debugging, so might remove later.
(ignore room session)
(ement-event-id event))
(ement-room-define-event-formatter ?O
"Room display name."
(ignore event session)
(let ((room-name (propertize (or (ement-room-display-name room)
(ement-room--room-display-name room))
'face 'ement-room-name
'help-echo (or (ement-room-canonical-alias room)
(ement-room-id room)))))
;; HACK: This will probably only be used in the notifications buffers, anyway.
(when ement-notify-limit-room-name-width
(setf room-name (truncate-string-to-width room-name ement-notify-limit-room-name-width
nil nil ement-room-ellipsis)))
room-name))
;; NOTE: In ?s and ?S, we add nearly-invisible ASCII unit-separator characters ("")
;; to prevent, e.g. `dabbrev-expand' from expanding display names with body text.
(ement-room-define-event-formatter ?s
"Sender MXID."
(ignore room session)
(concat (propertize (ement-user-id (ement-event-sender event))
'face 'ement-room-user)
""))
(ement-room-define-event-formatter ?S
"Sender display name."
(ignore session)
(let ((sender (ement-room--format-user (ement-event-sender event) room)))
(when (and (not ement-room-sender-in-headers)
(< (string-width sender) ement-room-left-margin-width))
;; Using :align-to or :width space display properties doesn't
;; seem to have any effect in the margin, so we make a string.
(setf sender (concat (make-string (- ement-room-left-margin-width (string-width sender))
? )
sender)))
;; NOTE: I'd like to add a help-echo function to display the sender ID, but the Emacs
;; manual says that there is currently no way to make text in the margins mouse-sensitive.
;; So `ement-room--format-user' returns a string propertized with `help-echo' as a string.
(concat sender "")))
(ement-room-define-event-formatter ?r
"Reactions."
(ignore room session)
(ement-room--format-reactions event))
(ement-room-define-event-formatter ?t
"Timestamp."
(ignore room session)
(propertize (format-time-string ement-room-timestamp-format ;; Timestamps are in milliseconds.
(/ (ement-event-origin-server-ts event) 1000))
'face 'ement-room-timestamp
'help-echo (format-time-string "%Y-%m-%d %H:%M:%S"
(/ (ement-event-origin-server-ts event) 1000))))
(defun ement-room--event-body-face (event room session)
"Return face definition for EVENT in ROOM on SESSION."
(ignore room) ;; Unused for now, but keeping for consistency.
;; This used to be a macro in --format-message, which is probably better for
;; performance, but using a function is clearer, and avoids premature optimization.
(pcase-let* (((cl-struct ement-event sender content) event)
((cl-struct ement-user (id sender-id)) sender)
((cl-struct ement-session user) session)
((cl-struct ement-user (id user-id)) user)
(self-message-p (equal sender-id user-id))
(type-face (pcase (alist-get 'msgtype content)
("m.emote" 'ement-room-message-emote)
(_ 'ement-room-message-text)))
(context-face (cond (self-message-p
'ement-room-self-message)
((ement-room--event-mentions-user-p event user)
'ement-room-mention)))
(prism-color (unless self-message-p
(when (eq 'both ement-room-prism)
(or (ement-user-color sender)
(setf (ement-user-color sender)
(ement-room--user-color sender))))))
(body-face (list :inherit (delq nil (list context-face type-face)))))
(if prism-color
(plist-put body-face :foreground prism-color)
body-face)))
(defun ement-room--add-member-face (string room)
"Add member faces in ROOM to STRING.
If STRING begins with the name of a member in ROOM followed by a
colon or comma (as if STRING is a message addressing that
member), apply that member's displayname color face to that part
of the string."
;; This only looks for a member name at the beginning of the string. It would be neat to add
;; colors to every member mentioned in a message, but that would probably not perform well.
(save-match-data
;; This function may be called from a chain of others that use the match data, so
;; rather than depending on all of them to save the match data, we do it here.
;; FIXME: Member names containing spaces aren't matched. Can this even be fixed reasonably?
(when (string-match (rx bos (group (1+ (not blank))) (or ":" ",") (1+ blank)) string)
(when-let* ((member-name (match-string 1 string))
;; HACK: Since we don't currently keep a list of all
;; members in a room, we look to see if this displayname
;; has any mentions in the room so far.
(user (save-match-data
(with-current-buffer (alist-get 'buffer (ement-room-local room))
(save-excursion
(goto-char (point-min))
(cl-labels ((found-sender-p
(ewoc-data)
(when (ement-event-p ewoc-data)
(equal member-name
(gethash room (ement-user-room-display-names (ement-event-sender ewoc-data)))))))
(cl-loop with regexp = (regexp-quote member-name)
while (re-search-forward regexp nil t)
;; NOTE: I don't know why, but sometimes the regexp
;; search ends on a non-event line, like a timestamp
;; header, so for now we just try to handle that case.
for maybe-event = (ewoc-data (ewoc-locate ement-ewoc))
when (found-sender-p maybe-event)
return (ement-event-sender maybe-event)))))))
(prism-color (or (ement-user-color user)
(setf (ement-user-color user)
(ement-room--user-color user)))))
(add-face-text-property (match-beginning 1) (match-end 1)
(list :foreground prism-color) nil string)))))
;;;; Bookmark support
;; Especially useful with Burly: <https://github.com/alphapapa/burly.el>
(require 'bookmark)
(defun ement-room-bookmark-make-record ()
"Return a bookmark record for the current `ement-room' buffer."
(pcase-let* (((cl-struct ement-room (id room-id) canonical-alias display-name) ement-room)
((cl-struct ement-session user) ement-session)
((cl-struct ement-user (id session-id)) user))
;; MAYBE: Support bookmarking specific events in a room.
(list (concat "Ement room: " display-name " (" canonical-alias ")")
(cons 'session-id session-id)
(cons 'room-id room-id)
(cons 'handler #'ement-room-bookmark-handler))))
(defun ement-room-bookmark-handler (bookmark)
"Show Ement room buffer for BOOKMARK."
(pcase-let* ((`(,_name . ,(map session-id room-id)) bookmark)
(session (ement-aprog1
(alist-get session-id ement-sessions nil nil #'equal)
(unless it
;; MAYBE: Automatically connect.
(user-error "Session %s not connected: call `ement-connect' first" session-id))))
(room (ement-aprog1
(ement-afirst (equal room-id (ement-room-id it))
(ement-session-rooms session))
(cl-assert it nil "Room %S not found on session %S" room-id session-id))))
(ement-view-room room session)))
;;;; Commands
(defun ement-room-set-message-format (format-spec)
"Set `ement-room-message-format-spec' in current buffer to FORMAT-SPEC.
Interactively, prompts for the spec using suggested values of the
option."
(interactive (list (let* ((choices (thread-last (get 'ement-room-message-format-spec 'custom-type)
cdr
(seq-filter (lambda (it)
(eq (car it) 'const)))
(mapcar (lambda (it)
(cons (nth 2 it) (nth 3 it))))))
(choice (completing-read "Format: " (mapcar #'car choices))))
(or (alist-get choice choices nil nil #'equal)
choice))))
(cl-assert ement-ewoc)
(ement-room-message-format-spec-setter 'ement-room-message-format-spec format-spec 'local)
(set-window-margins nil ement-room-left-margin-width ement-room-right-margin-width)
(if ement-room-sender-in-headers
(ement-room--insert-sender-headers)
(ewoc-filter ement-ewoc (lambda (node-data)
;; Return non-nil for nodes that should stay.
(not (ement-user-p node-data)))))
(ewoc-refresh ement-ewoc))
(defun ement-room-set-topic (session room topic)
"Set ROOM's TOPIC on SESSION.
Interactively, set the current buffer's ROOM's TOPIC."
(interactive (list ement-session ement-room
(read-string (format "New topic (%s): "
(ement-room-display-name ement-room))
nil nil (ement-room-topic ement-room) 'inherit-input-method)))
(pcase-let* (((cl-struct ement-room (id room-id) display-name) room)
(endpoint (format "rooms/%s/state/m.room.topic" (url-hexify-string room-id)))
(data (ement-alist "topic" topic)))
(ement-api session endpoint :method 'put :data (json-encode data)
:then (lambda (_data)
(message "Topic set (%s): %s" display-name topic)))))
(declare-function ement-upload "ement" t t)
(defun ement-room-send-image (file body room session)
"Send image FILE to ROOM on SESSION, using message BODY."
;; TODO: Support URLs to remote files.
(interactive (ement-room-with-typing
(let* ((file (read-file-name (format "Send image file (%s): " (ement-room-display-name ement-room))
nil nil 'confirm))
(body (ement-room-read-string (format "Message body (%s): " (ement-room-display-name ement-room))
(file-name-nondirectory file) nil nil 'inherit-input-method)))
(list file body ement-room ement-session))))
;; NOTE: The typing notification won't be quite right, because it'll be canceled while waiting
;; for the file to upload. It would be awkward to handle that, so this will do for now.
(when (yes-or-no-p (format "Upload file %S to room %S? "
file (ement-room-display-name room)))
(pcase-let* ((extension (file-name-extension file))
(mime-type (mailcap-extension-to-mime extension))
(data (with-temp-buffer
;; NOTE: Using (set-buffer-multibyte nil) doesn't
;; seem to be necessary, but I don't know why not.
(insert-file-contents file)
(buffer-string)))
(size (length data)))
(ement-upload session :data data :content-type mime-type
:then (lambda (data)
(message "Uploaded file %S. Sending message..." file)
(pcase-let* (((map ('content_uri content-uri)) data)
((cl-struct ement-room (id room-id)) room)
(endpoint (format "rooms/%s/send/%s/%s" (url-hexify-string room-id)
"m.room.message" (ement-room-update-transaction-id session)))
;; TODO: Image height/width (maybe not easy to get in Emacs).
(content (ement-alist "msgtype" "m.image"
"url" content-uri
"body" body
"info" (ement-alist "mimetype" mime-type
"size" size))))
(ement-api session endpoint :method 'put :data (json-encode content)
:then (apply-partially #'ement-room-send-event-callback
:room room :session session :content content :data))))))))
(defun ement-room-scroll-up-mark-read ()
"Scroll buffer up, marking read and burying when at end."
(interactive)
(if (= (window-point) (point-max))
(progn
;; At the bottom of the buffer: mark read and show next unread room.
(when ement-room-mark-rooms-read
(ement-room-mark-read ement-room ement-session
:read-event (ewoc-data (ement-room--ewoc-last-matching ement-ewoc
(lambda (data) (ement-event-p data))))
:fully-read-event (ewoc-data (ement-room--ewoc-last-matching ement-ewoc
(lambda (data) (ement-event-p data))))))
(set-buffer-modified-p nil)
(if-let ((rooms-window (cl-find-if (lambda (window)
(member (buffer-name (window-buffer window))
'("*Ement Taxy*" "*Ement Rooms*")))
(window-list))))
;; Rooms buffer already displayed: select its window and move to next unread room.
(with-selected-window rooms-window
(funcall (pcase-exhaustive major-mode
('ement-room-list-mode #'ement-room-list-next-unread)
('ement-taxy-mode #'ement-taxy-next-unread))))
;; Rooms buffer not displayed: bury this room buffer, which should usually
;; result in another room buffer or the rooms list buffer being displayed.
(bury-buffer))
(when (member major-mode '(ement-room-list-mode ement-taxy-room-list-mode))
;; Back in the room-list buffer: revert it.
(revert-buffer)))
;; Not at the bottom of the buffer: scroll.
(condition-case _err
(scroll-up-command)
(end-of-buffer (set-window-point nil (point-max))))))
(declare-function ement-complete-session "ement")
(defun ement-room-join (id-or-alias session)
"Join room by ID-OR-ALIAS on SESSION."
(interactive (list (read-string "Join room (ID or alias): ")
(or ement-session
(ement-complete-session))))
(cl-assert id-or-alias) (cl-assert session)
(unless (string-match-p
;; According to tulir in #matrix-dev:matrix.org, ": is not
;; allowed in the localpart, all other valid unicode is
;; allowed. (user ids and room ids are the same over
;; federation). it's mostly a lack of validation in
;; synapse (arbitrary unicode isn't intentionally allowed,
;; but it's not disallowed either)". See
;; <https://matrix.to/#/!jxlRxnrZCsjpjDubDX:matrix.org/$Cnb53UQdYnGFizM49Aje_Xs0BxVdt-be7Dnm7_k-0ho>.
(rx bos (or "#" "!") (1+ (not (any ":")))
":" (1+ (or alnum (any "-."))))
id-or-alias)
(user-error "Invalid room ID or alias (use, e.g. \"#ROOM-ALIAS:SERVER\")"))
(let ((endpoint (format "join/%s" (url-hexify-string id-or-alias))))
(ement-api session endpoint :method 'post :data ""
:then (lambda (data)
;; NOTE: This generates a symbol and sets its function value to a lambda
;; which removes the symbol from the hook, removing itself from the hook.
;; TODO: When requiring Emacs 27, use `letrec'.
(pcase-let* (((map ('room_id room-id)) data)
(join-fn-symbol (gensym (format "ement-join-%s" id-or-alias)))
(join-fn
(lambda (session)
(when-let ((room (cl-loop for room in (ement-session-rooms session)
when (equal room-id (ement-room-id room))
return room)))
;; In case the join event is not in this next sync
;; response, make sure the room is found before removing
;; the function and joining the room.
(remove-hook 'ement-sync-callback-hook join-fn-symbol)
;; FIXME: Probably need to unintern the symbol.
(ement-view-room room session)))))
(setf (symbol-function join-fn-symbol) join-fn)
(when ement-room-join-view-buffer
(add-hook 'ement-sync-callback-hook join-fn-symbol))
(message "Joined room: %s" room-id)))
:else (lambda (plz-error)
(pcase-let* (((cl-struct plz-error response) plz-error)
((cl-struct plz-response status body) response)
((map error) (json-read-from-string body)))
(pcase status
((or 403 429) (error "Unable to join room %s: %s" id-or-alias error))
(_ (error "Unable to join room %s: %s %S" id-or-alias status plz-error))))))))
(defalias 'ement-join-room #'ement-room-join)
(declare-function ement-complete-room "ement")
(declare-function ement--format-room "ement")
(defun ement-room-leave (room session)
"Leave ROOM on SESSION.
ROOM may be an `ement-room' struct, or a room ID or alias
string."
(interactive (ement-complete-room (ement-complete-session)))
(cl-assert room) (cl-assert session)
(cl-etypecase room
(ement-room)
(string (setf room (ement-afirst (or (equal room (ement-room-canonical-alias it))
(equal room (ement-room-id it)))
(ement-session-rooms session)))))
(when (yes-or-no-p (format "Leave room %s? " (ement--format-room room)))
(pcase-let* (((cl-struct ement-room id) room)
(endpoint (format "rooms/%s/leave" (url-hexify-string id))))
(ement-api session endpoint :method 'post :data ""
:then (lambda (_data)
;; NOTE: This generates a symbol and sets its function value to a lambda
;; which removes the symbol from the hook, removing itself from the hook.
;; TODO: When requiring Emacs 27, use `letrec'.
(let* ((leave-fn-symbol (gensym (format "ement-leave-%s" room)))
(leave-fn
(lambda (_session)
(remove-hook 'ement-sync-callback-hook leave-fn-symbol)
;; FIXME: Probably need to unintern the symbol.
(when-let ((buffer (map-elt (ement-room-local room) 'buffer)))
(when (buffer-live-p buffer)
(kill-buffer buffer))))))
(setf (symbol-function leave-fn-symbol) leave-fn)
(when ement-room-leave-kill-buffer
(add-hook 'ement-sync-callback-hook leave-fn-symbol))
(message "Left room: %s" (ement--format-room room))))
:else (lambda (plz-error)
(pcase-let* (((cl-struct plz-error response) plz-error)
((cl-struct plz-response status body) response)
((map error) (json-read-from-string body)))
(pcase status
(429 (error "Unable to leave room %s: %s" room error))
(_ (error "Unable to leave room %s: %s %S" room status plz-error)))))))))
(defalias 'ement-leave-room #'ement-room-leave)
(defun ement-room-goto-prev ()
"Go to the previous message in buffer."
(interactive)
(ement-room-goto-next :next-fn #'ewoc-prev))
(cl-defun ement-room-goto-next (&key (next-fn #'ewoc-next))
"Go to the next message in buffer.
NEXT-FN is passed to `ement-room--ewoc-next-matching', which
see."
(interactive)
(if-let (node (ement-room--ewoc-next-matching ement-ewoc
(ewoc-locate ement-ewoc) #'ement-event-p next-fn))
(ewoc-goto-node ement-ewoc node)
(user-error "End of events")))
(defun ement-room-scroll-down-command ()
"Scroll down, and load NUMBER earlier messages when at top."
(interactive)
(condition-case _err
(scroll-down nil)
(beginning-of-buffer
(when (call-interactively #'ement-room-retro)
(message "Loading earlier messages...")))))
(defun ement-room-mwheel-scroll (event)
"Scroll according to EVENT, loading earlier messages when at top."
(interactive "e")
(with-selected-window (posn-window (event-start event))
(condition-case _err
(mwheel-scroll event)
(beginning-of-buffer
(when (call-interactively #'ement-room-retro)