Ement.el

• Installation
  • GNU ELPA
  • Quelpa
  • Manual
• Usage
  • Bindings
    • Room buffers
    • Room list buffer
    • Mentions/notifications buffers
  • Tips
    • Displaying symbols and emojis
  • Encrypted room support through Pantalaimon
• Rationale
• Changelog
  • 0.1.2-pre
  • 0.1.1
  • 0.1
• Development
  • Copyright Assignment
  • Matrix spec in Org format
• License

Ement.el is a Matrix client for Emacs. It aims to be simple, fast, featureful, and reliable.

Feel free to join us in the chat room: https://img.shields.io/matrix/ement.el:matrix.org.svg?label=%23ement.el:matrix.org

Installation

GNU ELPA

Ement.el is published in GNU ELPA, so it may be installed in Emacs with the package-install command, which will install the current stable release.

Quelpa

The master branch of the Git repository is intended to be usable at all times; only minor bugs are expected to be found in it before a new stable release is made. To install from this, it is recommended to use quelpa-use-package, like this:

  ;; Install and load `quelpa-use-package'.
  (package-install 'quelpa-use-package)
  (require 'quelpa-use-package)

  ;; Install Ement.
  (use-package ement
    :quelpa (ement :fetcher github :repo "alphapapa/ement.el"))

Manual

Ement.el is intended to be installed with Emacs's package system, which will ensure that the required autoloads are generated, etc. If you choose to install it manually, you're on your own.

Usage

• Bindings
• Tips
• Encrypted room support through Pantalaimon

1. Call command ement-connect to connect. Multiple sessions are supported, so you may call the command again to connect to another account.
2. Wait for initial sync to complete (which can take a few moments–initial sync JSON requests can be large).

3. Use these commands:

   • ement-list-rooms to view the list of joined rooms.
   • ement-view-room to view a room's buffer, selected with completion.
   • ement-create-room to create a new room.
   • ement-invite-user to invite a user to a room.
   • ement-join-room to join a room.
   • ement-leave-room to leave a room.
   • ement-forget-room to forget a room.
   • ement-tag-room to add (or with interactive prefix, remove) a tag on a room (including favorite/low-priority status).
   • ement-list-members to list members in a room.
   • ement-send-direct-message to send a direct message to a user (in an existing direct room, or creating a new one automatically).
   • ement-room-edit-message to edit a message at point.
   • ement-room-send-file to send a file.
   • ement-room-send-image to send an image.
   • ement-room-set-topic to set a room's topic.
   • ement-room-occur to search in a room's known events.
   • ement-ignore-user to ignore a user (or with interactive prefix, un-ignore).
   • ement-room-set-message-format to set a room's message format buffer-locally.

4. Use these special buffers to see events from multiple rooms (you can also reply to messages from these buffers!):

   • See all new events that mention you in the *Ement Mentions* buffer.
   • See all new events in rooms that have open buffers in the *Ement Notifications* buffer.

Bindings

These bindings are common to all of the following buffer types:

• Switch to a room buffer: M-g M-r
• Switch to the room list buffer: M-g M-l
• Switch to the mentions buffer: M-g M-m
• Switch to the notifications buffer: M-g M-n

Room buffers

• Show command menu: ?

Movement

• Next event: TAB
• Previous event: <backtab>
• Scroll up and mark read: SPC
• Scroll down: S-SPC
• Jump to fully-read marker: M-SPC
• Load older messages: at top of buffer, scroll contents up (i.e. S-SPC, M-v or mwheel-scroll)

Switching

• List rooms: M-g M-l
• Switch to other room: M-g M-r
• Switch to mentions buffer: M-g M-m
• Switch to notifications buffer: M-g M-n
• Quit window: q

Messages

• Write message: RET
• Write reply to event at point (when region is active, only quote marked text) : S-RET
• Compose message in buffer: M-RET (while writing in minibuffer: C-c ') (Use command ement-room-compose-org to activate Org mode in the compose buffer.)
• Edit message: <insert>
• Delete message: C-k
• Send reaction to event at point, or send same reaction at point: s r
• Send emote: s e
• Send file: s f
• Send image: s i
• View event source: v
• Complete members and rooms at point: C-M-i (standard completion-at-point command).

Images

• Toggle scale of image (between fit-to-window and thumbnail): mouse-1
• Show image in new buffer at full size: double-mouse-1

Users

• Send direct message: u RET
• Invite user: u i
• Ignore user: u I

Room

• Occur search in room: M-s o
• List members: r m
• Set topic: r t
• Set message format: r f
• Tag/untag room: r T

Room membership

• Create room: R c
• Join room: R j
• Leave room: R l
• Forget room: R F

Other

• Sync new messages (not necessary if auto sync is enabled; with prefix to force new sync): g

Room list buffer

• Show buffer of room at point: RET
• Show buffer of next unread room: SPC
• Move between room names: TAB / <backtab>

Mentions/notifications buffers

• Move between events: TAB / <backtab>
• Go to event at point in its room buffer: RET
• Write reply to event at point (shows the event in its room while writing) : S-RET

Tips

• Desktop notifications are enabled by default for events that mention the local user. They can also be shown for all events in rooms with open buffers.

• Send messages in Org mode format by customizing the option ement-room-send-message-filter (which enables Org format by default), or by calling ement-room-compose-org in a compose buffer (which enables it for a single message). Then Org-formatted messages are automatically converted and sent as HTML-formatted messages (with the Org syntax as the plain-text fallback). You can send syntax such as:

  • Bold, italic, underline, strikethrough
  • Links
  • Tables
  • Source blocks (including results with :exports both)
  • Footnotes (okay, that might be pushing it, but you can!)
  • And, generally, anything that Org can export to HTML
• Starting in the room list buffer, by pressing SPC repeatedly, you can cycle through and read all rooms with unread buffers. (If a room doesn't have a buffer, it will not be included.)
• Room buffers and the room-list buffer can be bookmarked in Emacs, i.e. using C-x r m. This is especially useful with Burly: you can arrange an Emacs frame with several room buffers displayed at once, use burly-bookmark-windows to bookmark the layout, and then you can restore that layout and all of the room buffers by opening the bookmark, rather than having to manually arrange them every time you start Emacs or change the window configuration.
• Images and other files can be uploaded to rooms using drag-and-drop.

• You can customize settings in the ement group.

  • Note: setq should not be used for certain options, because it will not call the associated setter function. Users who have an aversion to the customization system may experience problems.

Displaying symbols and emojis

Emacs may not display certain symbols and emojis well by default. Based on this question and answer, you may find that the simplest way to fix this is to install an appropriate font, like Noto Emoji, and then use this Elisp code:

  (setf use-default-font-for-symbols nil)
  (set-fontset-font t 'unicode "Noto Emoji" nil 'append)

Encrypted room support through Pantalaimon

Ement.el doesn't support encrypted rooms natively, but it can be used transparently with the E2EE-aware reverse proxy daemon Pantalaimon. After configuring it according to its documentation, call ement-connect with the appropriate hostname and port, like:

  (ement-connect :uri-prefix "http://localhost:8009")

Rationale

Why write a new Emacs Matrix client when there is already matrix-client.el, by the same author, no less? A few reasons:

• matrix-client uses an older version of the Matrix spec, r0.3.0, with a few elements of r0.4.0 grafted in. Bringing it up to date with the current version of the spec, r0.6.1, would be more work than to begin with the current version. Ement.el targets r0.6.1 from the beginning.
• matrix-client does not use Matrix's lazy-loading feature (which was added to the specification later), so initial sync requests can take a long time for the server to process and can be large (sometimes tens of megabytes of JSON for the client to process!). Ement.el uses lazy-loading, which significantly improves performance.
• matrix-client automatically makes buffers for every room a user has joined, even if the user doesn't currently want to watch a room. Ement.el opens room buffers on-demand, improving performance by not having to insert events into buffers for rooms the user isn't watching.
• matrix-client was developed without the intention of publishing it to, e.g. MELPA or ELPA. It has several dependencies, and its code does not always install or compile cleanly due to macro-expansion issues (apparently depending on the user's Emacs config). Ement.el is designed to have minimal dependencies outside of Emacs (currently only one, plz, which could be imported into the project), and every file is linted and compiles cleanly using makem.sh.
• matrix-client uses EIEIO, probably unnecessarily, since few, if any, of the benefits of EIEIO are realized in it. Ement.el uses structs instead.
• matrix-client uses bespoke code for inserting messages into buffers, which works pretty well, but has a few minor bugs which are difficult to track down. Ement.el uses Emacs's built-in (and perhaps little-known) ewoc library, which makes it much simpler and more reliable to insert and update messages in buffers, and enables the development of advanced UI features more easily.
• matrix-client was, to a certain extent, designed to imitate other messaging apps. The result is, at least when used with the matrix-client-frame command, fairly pleasing to use, but isn't especially "Emacsy." Ement.el is intended to better fit into Emacs's paradigms.
• matrix-client's long name makes for long symbol names, which makes for tedious, verbose code. ement is easy to type and makes for concise, readable code.
• The author has learned much since writing matrix-client and hopes to write simpler, more readable, more maintainable code in Ement.el. It's hoped that this will enable others to contribute more easily.

Note that, while matrix-client remains usable, and probably will for some time to come, Ement.el has now surpassed it in every way. The only reason to choose matrix-client instead is if one is using an older version of Emacs that isn't supported by Ement.el.

Changelog

0.1.2-pre

Nothing new yet.

0.1.1

Fixed

• Function ement-room-scroll-up-mark-read selects the correct room window.
• Option ement-room-list-avatars defaults to what function display-images-p returns.

0.1

After almost two years of development, the first tagged release. Submitted to GNU ELPA.

Development

Bug reports, feature requests, suggestions — oh my!

Copyright Assignment

Ement.el is published in GNU ELPA and is considered part of GNU Emacs. Therefore, cumulative contributions of more than 15 lines of code require that the author assign copyright of such contributions to the FSF. Authors who are interested in doing so may contact assign@gnu.org to request the appropriate form.

Matrix spec in Org format

An Org-formatted version of the Matrix spec is available in the meta/spec branch.

License

GPLv3