2021-07-01 11:49:45 +02:00
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# Slash commands
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Slash commands are commands (mainly for power users) to quickly do
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some stuff from the compose box. The codebase refers to these as "zcommand"s,
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and both these terms are often user interchangeably.
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Currently supported slash commands are:
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- `/day` and `/night` to change the UI theme
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- `/ping` to ping to server and get back the time for the round
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trip. Mainly for testing.
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- `/fluid-width` and `/fixed-width` to toggle that setting
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It is important to distinguish slash commands from the
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[widget system](/subsystems/widgets.md). Slash commands essentially
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**do not send** messages (and could have very well had their
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own "command prompt" (but don't), since they have nothing to do with
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message sending), while widgets are special kinds of messages.
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### Data flow
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These commands have client-side support in `zcommands.js`.
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They send commands to the server using the `/json/command`
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endpoint.
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In the case of "/ping", the server code in `zcommand.py`
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basically just acks the client. The client then computes
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the round trip time and shows a little message above
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the compose box that the user can see and then dismiss.
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For commands like "/day" and "/night", the server does
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a little bit of logic to toggle the user's night mode
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setting, and this is largely done inside `zcommand.py`.
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The server sends a very basic response, and then
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the client actually changes the display colors. The
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client also shows the user a little message above
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the compose box instructing them how to reverse the
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change.
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(It's possible that we don't really need a general
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`/json/zcommand` endpoint for these, and we
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may decide later to just use custom
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API endpoints for each command. There's some logic
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2021-07-01 11:49:45 +02:00
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in having a central API for these, though, since they
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are typically things that only UI-based clients will
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invoke, and they may share validation code.)
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It is the client's responsibility to correctly detect and
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process when a user uses a slash command, and not instead
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send a message with the raw content.
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## Typeahead
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Typeahead for both slash commands (and widgets) is implemented
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via the `slash_commands` object in `static/js/composebox_typeahead.js`.
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