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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) 2022-2023 Free Software Foundation, Inc.
;; Author: Adam Porter <adam@alphapapa.net>
;; Maintainer: Adam Porter <adam@alphapapa.net>
;; 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:
;; This library implements buffers displaying events in a room.
;; 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
;; NOTE: Uncomment this form and `emacs-lisp-byte-compile-and-load' the file to enable
;; `ement-debug' messages. This is commented out by default because, even though the
;; messages are only displayed when `warning-minimum-log-level' is `:debug' at runtime, if
;; that is so at expansion time, the expanded macro calls format the message and check the
;; log level at runtime, which is not zero-cost.
;; (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 'dnd)
(require 'ement-api)
(require 'ement-lib)
(require 'ement-macros)
(require 'ement-structs)
;;;; Structs
(cl-defstruct ement-room-membership-events
"Struct grouping membership events.
After adding events, use `ement-room-membership-events--update'
to sort events and update other slots."
(events nil :documentation "Membership events, latest first.")
(earliest-ts nil :documentation "Timestamp of earliest event.")
(latest-ts nil :documentation "Timestamp of latest event."))
(defun ement-room-membership-events--update (struct)
"Return STRUCT having sorted its events and updated its slots."
;; Like the room timeline slot, events are sorted latest-first. We also deduplicate
;; them , because it seems that we can end up with multiple copies of a membership event
;; (e.g. when loading old messages).
(setf (ement-room-membership-events-events struct) (cl-delete-duplicates (ement-room-membership-events-events struct)
:key #'ement-event-id :test #'equal)
(ement-room-membership-events-events struct) (cl-sort (ement-room-membership-events-events struct) #'>
:key #'ement-event-origin-server-ts)
(ement-room-membership-events-earliest-ts struct) (ement-event-origin-server-ts
(car (last (ement-room-membership-events-events struct))))
(ement-room-membership-events-latest-ts struct) (ement-event-origin-server-ts
(car (ement-room-membership-events-events struct))))
struct)
;;;; 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.")
;; TODO: Convert some of these buffer-local variables into keys in one buffer-local map variable.
(defvar-local ement-room-retro-loading nil
"Non-nil when earlier messages are being loaded.
Used to avoid overlapping requests.")
(defvar-local ement-room-editing-event nil
"When non-nil, the user is editing this event.
Used by `ement-room-send-message'.")
(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-write-reply'.")
(defvar-local ement-room-read-receipt-request nil
"Maps event ID to request updating read receipt to that event.
An alist of one entry.")
(defvar ement-room-read-string-setup-hook nil
"Normal hook run by `ement-room-read-string' after switching to minibuffer.
Should be used to, e.g. propagate variables to the minibuffer.")
(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-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 "?") #'ement-room-transient)
;; Movement
(define-key map (kbd "n") #'ement-room-goto-next)
(define-key map (kbd "N") #'end-of-buffer)
(define-key map (kbd "p") #'ement-room-goto-prev)
(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-g M-p") #'ement-room-goto-fully-read-marker)
(define-key map (kbd "m") #'ement-room-mark-read)
(define-key map [remap scroll-down-command] #'ement-room-scroll-down-command)
(define-key map [remap mwheel-scroll] #'ement-room-mwheel-scroll)
;; Switching
(define-key map (kbd "M-g M-l") #'ement-room-list)
(define-key map (kbd "M-g M-r") #'ement-view-room)
(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)
(define-key map (kbd "q") #'quit-window)
;; Messages
(define-key map (kbd "RET") #'ement-room-send-message)
(define-key map (kbd "S-<return>") #'ement-room-write-reply)
(define-key map (kbd "M-RET") #'ement-room-compose-message)
(define-key map (kbd "<insert>") #'ement-room-edit-message)
(define-key map (kbd "C-k") #'ement-room-delete-message)
(define-key map (kbd "s r") #'ement-room-send-reaction)
(define-key map (kbd "s e") #'ement-room-send-emote)
(define-key map (kbd "s f") #'ement-room-send-file)
(define-key map (kbd "s i") #'ement-room-send-image)
(define-key map (kbd "v") #'ement-room-view-event)
;; Users
(define-key map (kbd "u RET") #'ement-send-direct-message)
(define-key map (kbd "u i") #'ement-invite-user)
(define-key map (kbd "u I") #'ement-ignore-user)
;; Room
(define-key map (kbd "M-s o") #'ement-room-occur)
(define-key map (kbd "r d") #'ement-describe-room)
(define-key map (kbd "r m") #'ement-list-members)
(define-key map (kbd "r t") #'ement-room-set-topic)
(define-key map (kbd "r f") #'ement-room-set-message-format)
(define-key map (kbd "r n") #'ement-room-set-notification-state)
(define-key map (kbd "r N") #'ement-room-override-name)
(define-key map (kbd "r T") #'ement-tag-room)
;; Room membership
(define-key map (kbd "R c") #'ement-create-room)
(define-key map (kbd "R j") #'ement-join-room)
(define-key map (kbd "R l") #'ement-leave-room)
(define-key map (kbd "R F") #'ement-forget-room)
(define-key map (kbd "R n") #'ement-room-set-display-name)
(define-key map (kbd "R s") #'ement-room-toggle-space)
;; Other
(define-key map (kbd "g") #'ement-room-sync)
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 headers.
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.")
(defvar ement-room-matrix.to-url-regexp
(rx "http" (optional "s") "://"
"matrix.to" "/#/"
(group (or "!" "#") (1+ (not (any "/"))))
(optional "/" (group "$" (1+ (not (any "?" "/")))))
(optional "?" (group (1+ anything))))
"Regexp matching \"matrix.to\" URLs.")
(defvar ement-room-message-history nil
"History list of messages entered with `ement-room' commands.
Does not include filenames, emotes, etc.")
(defvar ement-room-emote-history nil
"History list of emotes entered with `ement-room' commands.")
;; Variables from other files.
(defvar ement-sessions)
(defvar ement-syncs)
(defvar ement-auto-sync)
(defvar ement-users)
(defvar ement-images-queue)
(defvar ement-notify-limit-room-name-width)
(defvar ement-view-room-display-buffer-action)
;; Defined in Emacs 28.1: silence byte-compilation warning in earlier versions.
(defvar browse-url-handlers)
;;;; Customization
(defgroup ement-room nil
"Options for room buffers."
:group 'ement)
(defcustom ement-room-timestamp-header-align 'right
"Where to align timestamp headers."
:type '(choice (const :tag "Left" left)
(const :tag "Center" center)
(const :tag "Right" right)))
(defcustom ement-room-view-hook
'(ement-room-view-hook-room-list-auto-update)
"Functions called when `ement-room-view' is called.
Called with two arguments, the room and the session."
:type 'hook)
;;;;; 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-quote
'((t (:height 0.9 :inherit font-lock-comment-face)))
"Quoted parts of messages.
Anything wrapped by HTML BLOCKQUOTE tag.")
(defface ement-room-redacted
'((t (:strike-through t)))
"Redacted messages.")
(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
;; TODO(30.1): Remove when not supporting Emacs 27 anymore.
(if (version< emacs-version "27.1")
'((t (:inherit hl-line)))
'((t (:inherit hl-line :extend t))))
"Messages that mention the local user.")
(defface ement-room-wrap-prefix
`((t :inherit highlight))
"Face applied to `ement-room-wrap-prefix', which see.")
;;;;; Options
(defcustom ement-room-ellipsis "⋮"
"String used when abbreviating certain strings."
:type 'string)
(defcustom ement-room-avatars (display-images-p)
"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-coalesce-events t
"Coalesce certain events in room buffers.
For example, membership events can be overwhelming in large
rooms, especially ones bridged to IRC. This option groups them
together so they take less space."
:type 'boolean)
(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)
(defcustom ement-room-unread-only-counts-notifications t
"Only use notification counts to mark rooms unread.
Notification counts are set by the server based on each room's
notification settings. Otherwise, whether a room is marked
unread depends on the room's fully-read marker, read-receipt
marker, whether the local user sent the latest events, etc."
:type 'boolean)
(defvar ement-room-sender-in-left-margin nil
"Whether sender is shown in left margin.
Set by `ement-room-message-format-spec-setter'.")
(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
ement-room-sender-in-left-margin nil))
("%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
ement-room-sender-in-left-margin t))
("[%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
ement-room-sender-in-left-margin 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-in-left-margin
(if (string-match-p (rx (1+ anything) (or "%S" "%s") (1+ anything) "%L") value)
t nil)
;; NOTE: The following two variables may seem redundant, but one is an
;; option that the user may override, while the other is set
;; automatically.
ement-room-sender-headers
(if (string-match-p (or "%S" "%s") value)
;; If "%S" or "%s" isn't found, assume it's to be shown in headers.
nil t)
ement-room-sender-in-headers
(if (string-match-p (rx (or "%S" "%s")) value)
;; If "%S" or "%s" isn't found, assume it's to be shown in headers.
nil t))
(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
%W End of wrap-prefix
%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 "IRC-style without margins, with wrap-prefix" "[%t] %S> %W%B%r")
(const :tag "IRC-style with right margin, with wrap-prefix" "%S> %W%B%r%R%t")
(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)\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)\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-shr-use-fonts nil
"Enable `shr' variable-pitch fonts for formatted bodies.
If non-nil, `shr' may use variable-pitch fonts for formatted
bodies (which include most replies), which means that some
messages won't display in the same font as others."
:type '(choice (const :tag "Disable variable-pitch fonts" nil)
(const :tag "Enable variable-pitch fonts" t)))
(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)
(defcustom ement-room-warn-for-already-seen-messages nil
"Warn when a sent message has already been seen.
Such a case could very rarely indicate a reused transaction ID,
which would prevent further messages from being sent (and would
be solved by logging in with a new session, generating a new
token), but most often it happens when the server echoes back a
sent message before acknowledging the sending of the
message (which is harmless and can be ignored)."
:type 'boolean)
(defcustom ement-room-wrap-prefix
(concat (propertize " "
'face 'ement-room-wrap-prefix)
" ")
"String prefixing certain events in room buffers.
Events include membership events, image attachments, etc.
Generally users should prefer to customize the face
`ement-room-wrap-prefix' rather than this option, because this
option's default value has that face applied to it where
appropriate; if users customize this option, they will need to
apply the face to the string themselves, if desired."
:type 'string)
(defgroup ement-room-prism nil
"Colorize usernames and messages in rooms."
:group 'ement-room)
(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-prism-message-desaturation 25
"Desaturate user colors by this percent for message bodies.
Makes message bodies a bit less intense."
:type 'integer)
(defcustom ement-room-prism-message-lightening 10
"Lighten user colors by this percent for message bodies.
Makes message bodies a bit less intense.
When using a light theme, it may be necessary to use a negative
number (to darken rather than lighten)."
:type 'integer)
;;;; 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-overlay)
(unless (and (ement-event-p event)
(ement-event-id event))
(error "No event at point"))
(unwind-protect
(progn
(setf 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-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))))
(defmacro ement-room-wrap-prefix (string-form &rest properties)
"Wrap STRING-FORM with `ement-room-wrap-prefix'.
Concats `ement-room-wrap-prefix' to STRING-FORM and applies it as
the `wrap-prefix' property. Also applies any PROPERTIES."
(declare (indent defun))
`(concat ement-room-wrap-prefix
(propertize ,string-form
'wrap-prefix ement-room-wrap-prefix
,@properties)))
(defsubst ement-room--concat-property (string property value &optional append)
"Return STRING having concatted VALUE with PROPERTY on it.
If APPEND, append it; otherwise prepend. Assumes PROPERTY is
constant throughout STRING."
(declare (indent defun))
(let* ((old-value (get-text-property 0 property string))
(new-value (if append
(concat old-value value)
(concat value old-value))))
(propertize string property new-value)))
;;;;; 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.")
(defvar ement-room--format-message-wrap-prefix 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)
(debug (characterp stringp def-body)))
`(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 ?W
"Text before this is the length of the event's wrap-prefix.
This emulates the effect of using the left margin (the \"%L\"
spec) without requiring all events to use the same margin width."
(ignore event room session)
(setf ement-room--format-message-wrap-prefix t)
(propertize " " 'wrap-prefix-end t))
;; FIXME(v0.12): The quote-end may be detected in the wrong position when, e.g. a link is
;; in the middle of the quoted part. We need to search backward from the end to find
;; where the quote face finally ends.
(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)))
(body-length (length body))
(face (ement-room--event-body-face event room session))
(quote-start (ement--text-property-search-forward 'face
(lambda (value)
(pcase value
('ement-room-quote t)
((pred listp) (member 'ement-room-quote value))))
body))
(quote-end (when quote-start
(ement--text-property-search-backward 'face
(lambda (value)
(pcase value
('ement-room-quote t)
((pred listp) (member 'ement-room-quote value))))
body))))
(add-face-text-property (or quote-end 0) body-length 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)))
(body-length (length body))
(face (ement-room--event-body-face event room session))
(quote-start (ement--text-property-search-forward 'face
(lambda (value)
(pcase value
('ement-room-quote t)
((pred listp) (member 'ement-room-quote value))))
body))
(quote-end (when quote-start
(ement--text-property-search-backward 'face
(lambda (value)
(pcase value
('ement-room-quote t)
((pred listp) (member 'ement-room-quote value))))
body :start (length body)))))
(add-face-text-property (or quote-end 0) body-length 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 avatar."
(ignore event session)
(or (alist-get 'room-list-avatar (ement-room-local room)) ""))
(ement-room-define-event-formatter ?O
"Room display name."
(ignore event session)
(let ((room-name (propertize (or (ement-room-display-name room)
(ement--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)
(pcase-let ((sender (ement--format-user (ement-event-sender event) room))
((cl-struct ement-room (local (map buffer))) room))
;; NOTE: When called from an `ement-notify' function, ROOM may have no buffer. In
;; that case, just use the current buffer (which should be a temp buffer used to
;; format the event).
(with-current-buffer (or buffer (current-buffer))
(when ement-room-sender-in-left-margin
;; Sender in left margin: truncate/pad appropriately.
(setf sender
(if (< (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.
(concat (make-string (- ement-room-left-margin-width (string-width sender))
? )
sender)
;; String wider than margin: truncate it.
(ement-room--concat-property
(truncate-string-to-width sender ement-room-left-margin-width nil nil "…")
'help-echo (concat 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--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 (map msgtype))
(unsigned (map ('redacted_by unsigned-redacted-by)))
(local (map ('redacted-by local-redacted-by))))
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 msgtype
("m.emote" 'ement-room-message-emote)
(_ 'ement-room-message-text)))
(context-face (cond (self-message-p
'ement-room-self-message)
((or (ement-room--event-mentions-user-p event user)
(ement--event-mentions-room-p event))
'ement-room-mention)))
(prism-color (unless self-message-p
(when (eq 'both ement-room-prism)
(or (ement-user-message-color sender)
(setf (ement-user-message-color sender)
(let ((message-color (color-desaturate-name (ement--user-color sender)
ement-room-prism-message-desaturation)))
(if (ement--color-dark-p (color-name-to-rgb (face-background 'default)))
(color-lighten-name message-color ement-room-prism-message-lightening)
(color-darken-name message-color ement-room-prism-message-lightening))))))))
(redacted-face (when (or local-redacted-by unsigned-redacted-by)
'ement-room-redacted))
(body-face (list :inherit (delq nil (list redacted-face 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.