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pbot/doc/Plugins/Plang.md
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# Plang
<!-- md-toc-begin -->
* [About](#about)
* [The Plang Language](#the-plang-language)
* [`plang` command](#plang-command)
* [`plangrepl` command](#plangrepl-command)
* [PBot built-in Plang functions](#pbot-built-in-plang-functions)
* [factget](#factget)
* [factset](#factset)
* [factappend](#factappend)
* [userget](#userget)
<!-- md-toc-end -->
## About
The Plang plugin provides a scripting interface to PBot. It has access to PBot
internal APIs and state.
## The Plang Language
The scripting language is [Plang](https://github.com/pragma-/Plang). It was
written specifically for PBot, but is powerful enough to be used as a general-purpose
scripting language embedded into any Perl application.
This document describes PBot's Plang plugin. To learn how to use the Plang scripting
language, see the [Plang documentation](https://github.com/pragma-/Plang/blob/master/README.md).
## `plang` command
Use the `plang` command to run a Plang script.
Usage: `plang <code>`
## `plangrepl` command
The `plangrepl` command is identical to the `plang` command, except the environment
is preserved in-between commands and the types of values is output along with the value.
## PBot built-in Plang functions
[Plang](https://github.com/pragma-/Plang) lets you add custom built-in functions.
Several have been added for PBot; they are described here.
### factget
factget(channel, keyword, meta = "action")
Use the `factget` function to retrieve metadata from factoids.
The `factget` function takes three paramaters: `channel`, `keyword` and `meta`. The `meta`
parameter can be omitted and will default to `"action"`.
The `factget` function returns a `String` containing the value of the factoid metadata key.
### factset
factset(channel, keyword, text)
Use the `factset` function to set the `action` metadata value for factoids.
The `factset` function takes three parameters: `channel`, `keyword` and `text`.
The `factset` function returns a `String` containing the value of `text`.
### factappend
factappend(channel, keyword, text)
Use the `factappend` function to append text to the `action` metadata for factoids.
The `factappend` function takes three parameters: `channel`, `keyword` and `text`.
The `factappend` function returns a `String` containing the value of factoid's `action`
metadata with `text` appended.
### userget
userget(name)
Use the `userget` function to retrieve user metadata.
The `userget` function takes one parameter: `name`.
The `userget` function returns a `Map` containing all the metadata of the user, or
`nil` if there is no user matching `name`.
See the [Plang Map documentation](https://github.com/pragma-/Plang#map) for a refresher on using Plang maps.
Examples:
<pragma-> !plang userget('pragma-')
<PBot> { channels: "global", hostmasks: "*!*@unaffiliated/pragmatic-chaos", botowner: 1 }
<pragma-> !plang userget('pragma-')['botowner']
<PBot> 1
<pragma-> !plang if userget('pragma-')['botowner'] then print('Greetings master!') else print('Hello mortal.')
<PBot> Greetings master!