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152 lines
5.2 KiB
Markdown
152 lines
5.2 KiB
Markdown
# Plang
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<!-- md-toc-begin -->
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* [About](#about)
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* [The Plang Language](#the-plang-language)
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* [PBot commands](#pbot-commands)
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* [plang](#plang-1)
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* [plangrepl](#plangrepl)
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* [PBot built-in Plang functions](#pbot-built-in-plang-functions)
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* [factget](#factget)
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* [factset](#factset)
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* [factappend](#factappend)
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* [userget](#userget)
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* [Examples](#examples)
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* [Basic examples](#basic-examples)
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* [Karma example](#karma-example)
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<!-- md-toc-end -->
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## About
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The Plang plugin provides a scripting interface to PBot. It has access to PBot
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internal APIs and state.
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## The Plang Language
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The scripting language is [Plang](https://github.com/pragma-/Plang). It was
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written specifically for PBot, but aims to be powerful enough to be used as a general-purpose
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scripting language embedded into any Perl application.
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This document describes PBot's Plang plugin. To learn how to use the Plang scripting
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language, see the [Plang documentation](https://github.com/pragma-/Plang/blob/master/README.md).
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## PBot commands
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### plang
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Use the `plang` command to run a Plang script.
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Usage: `plang <code>`
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### plangrepl
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The `plangrepl` command is identical to the `plang` command, except the environment
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is preserved in-between commands and the types of values is output along with the value.
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## PBot built-in Plang functions
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[Plang](https://github.com/pragma-/Plang) lets you add custom built-in functions.
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Several have been added for PBot; they are described here.
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### factget
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Use the `factget` function to retrieve metadata from factoids.
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Signature: `factget(channel: String, keyword: String, meta: String = "action") -> String | Null`
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The `factget` function takes three paramaters: `channel`, `keyword` and `meta`. The `meta`
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parameter can be omitted and will default to `"action"`.
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The `factget` function returns a `String` containing the value of the factoid metadata or
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`null` if the factoid does not exist.
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### factset
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Use the `factset` function to set metadata values for factoids. The factoid
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will be created if it does not exist.
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Signature: `factset(channel: String, keyword: String, text: String, meta: String = "action") -> String`
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The `factset` function takes four parameters: `channel`, `keyword`, `text`,
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and optionally `meta`. If the `meta` parameter is omitted it will default to
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`"action"`.
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The `factset` function returns a `String` containing the value of `text`.
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### factappend
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Use the `factappend` function to append text to the `action` metadata for factoids.
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Signature: `factappend(channel: String, keyword: String, text: String) -> String`
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The `factappend` function takes three parameters: `channel`, `keyword` and `text`.
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The `factappend` function returns a `String` containing the value of factoid's `action`
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metadata with `text` appended.
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### userget
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Use the `userget` function to retrieve user metadata.
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Signature: `userget(name: String) -> Map | Null`
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The `userget` function takes one parameter: `name`.
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The `userget` function returns a `Map` containing all the metadata of the user, or
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`null` if there is no user matching `name`.
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See the [Plang Map documentation](https://github.com/pragma-/Plang#maps) for a refresher on using Plang maps.
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## Examples
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### Basic examples
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<pragma-> !plang userget('pragma-')
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<PBot> { channels: "global", hostmasks: "*!*@unaffiliated/pragmatic-chaos", botowner: 1 }
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<pragma-> !plang userget('pragma-').botowner
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<PBot> 1
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<pragma-> !plang if userget('pragma-').botowner then print('Greetings master!') else print('Hello mortal.')
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<PBot> Greetings master!
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### Karma example
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Here is a quick-and-dirty way to make a simple Karma system. This is a demonstration of what is
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currently possible with Plang. This will not be its final form. Support for classes will be added
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soon.
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We'll use the `factget()` and `factset()` functions to get and store Karma values to an
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unique unused channnel. Let's call it `#karma-data`. To get the first command argument,
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we'll use PBot's special factoid variable `$arg[0]`.
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First we add the `++` command.
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<pragma-> !factadd ++ /call plang var karma = Integer(factget('#karma-data', '$arg[0]')); karma += 1; factset('#karma-data', '$arg[0]', String(karma));
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<PBot> ++ added to global channel.
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Similarly, we add the `--` command.
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<pragma-> !factadd -- /call plang var karma = Integer(factget('#karma-data', '$arg[0]')); karma -= 1; factset('#karma-data', '$arg[0]', String(karma));
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<PBot> -- added to global channel.
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Finally, we add the `karma` command.
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<pragma-> !factadd karma /call plang var k = factget('#karma-data' , '$arg[0]'); if k == null then print('No karma for $arg[0] yet.') else print($'Karma for $arg[0]: {k}')
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<PBot> karma added to global channel.
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A short demonstration:
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<pragma-> !karma nf
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<PBot> No karma for nf yet.
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<pragma-> !-- nf
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<PBot> -1
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<pragma-> !-- nf
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<PBot> -2
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<pragma-> !++ nf
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<PBot> -1
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<pragma-> !karma nf
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<PBot> Karma for nf: -1
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You can use double quotes to group multiple words as one argument (but not single quotes due to how `$arg[0]` is inserted
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into single-quoted strings in the Plang snippets).
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<pragma-> !++ "this and that"
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<PBot> 1
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<pragma-> !karma "this and that"
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<PBot> Karma for "this and that": 1
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