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doc/Commands.md: add Functions

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Pragmatic Software 2020-02-16 12:22:05 -08:00
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* [Built-in commands](#built-in-commands)
* [Creating new built-in commands](#creating-new-built-in-commands)
* [Plugins](#plugins)
* [Functions](#functions)
* [Factoids](#factoids)
* [Code Factoids](#code-factoids)
* [Modules](#modules)
@ -205,6 +206,18 @@ stand-alone self-contained units of code that can be loaded by the PBot owner.
* only bot owner can install and load PBot Plugins
* PBot Plugins have access to PBot internal API functions and data structures
#### Functions
Functions are commands that accept input, manipulate it and then output the result. They are extremely
useful with [piping](#piping) or [command substituting](#substitution).
For example, the `uri_escape` function demonstrated in the [Substitutions](#substitutions) section earlier
makes text safe for use in a URL. We also saw the `sed` and `uc` functions demonstrated in [Piping](#piping).
Functions can be loaded via PBot Plugins.
* only bot owner can load new Functions
* Functions have access to PBot internal API functions and data structures
### Factoids
Factoids are another type of command. Factoids are simple text commands which
anybody can create. In their most basic form, they simply display their text