mirror-chatterino2/docs/wip-plugins.md

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# Plugins
If Chatterino is compiled with the `CHATTERINO_PLUGINS` CMake option, it can
load and execute Lua files. Note that while there are attempts at making this
decently safe, we cannot guarantee safety.
## API
The following parts of the Lua standard library are loaded:
- `_G` (all globals)
- `table`
- `string`
- `math`
- `utf8`
The official manual for them is available [here](https://www.lua.org/manual/5.4/manual.html#6).
### Chatterino API
All Chatterino functions are exposed in a global table called `c2`. The following functions are available
### `register_command(name, handler)`
Registers a new command called `name` which when executed will call `handler`.
Returns `true` if everything went ok, `false` if there already exists another
command with this name.
Example:
```lua
function cmdWords(ctx)
-- ctx contains:
-- words - table of words supplied to the command including the trigger
-- channelName - name of the channel the command is being run in
c2.system_msg(ctx.channelName, "Words are: " .. table.concat(ctx.words, " "))
end
c2.register_command("/wordsl", cmdWords)
```
Limitations/known issues:
- commands registered in functions, not in the global scope might not show up in the settings UI,
rebuilding the window content caused by reloading another plugin will solve this
- spaces in command names aren't handled very well (https://github.com/Chatterino/chatterino2/issues/1517)
### `send_msg(channel, text)`
Sends a message to `channel` with the specified text. Also executes commands.
Example:
```
function cmdShout(ctx)
table.remove(ctx.words, 1)
local output = table.concat(ctx.words, " ")
c2.send_msg(ctx.channelName, string.upper(output))
end
c2.register_command("/shout", cmdShout)
```
Limitations/Known issues:
- it is possible to trigger your own Lua command with this causing a potentially infinite loop
### `system_msg(channel, text)`
Creates a system message and adds it to the twitch channel specified by
`channel`. Returns `true` if everything went ok, `false` otherwise. It will
throw an error if the number of arguments received doesn't match what it
expects.
Example:
```lua
local ok = c2.system_msg("pajlada", "test")
if (not ok)
-- channel not found
end
```