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---
title: A Guide to the Hakyll Module Zoo
author: Brent Yorgey
type: article
---
The hakyll package [contains a bewildering array](/reference/) of modules, and
it's hard to know where to look when you are just getting started -- especially
since many of them are mostly just used by Hakyll internally and not that useful
to website authors. This guide provides a quick reference to the contents of the
most important and useful modules.
## Core modules
These are the modules containing the fundamental tools and concepts
you need to get started building a site with hakyll.
* [Hakyll.Core.Compiler](/reference/Hakyll-Core-Compiler.html)
This is one of the modules you should look at first. It defines the
fundamental `Compiler` type and primitive `Compiler`s as well as several
variants on `load`, which allow you to bring together multiple resources to
create a single output.
* [Hakyll.Core.Routes](/reference/Hakyll-Core-Routes.html)
Specify where compiled items should go in the output site.
* [Hakyll.Core.Rules](/reference/Hakyll-Core-Rules.html)
Specify which compilers and routes should be used on which resources. Also
has combinators for versions (necessary if you want to use the same
resources for multiple purposes).
* [Hakyll.Core.Identifier.Pattern](/reference/Hakyll-Core-Identifier-Pattern.html)
Combinators for creating *patterns*, i.e. predicates that pick out a set of
resources: filesystem globs, explicit lists, regular expressions, and so on.
* [Hakyll.Web.Page](/reference/Hakyll-Web-Pandoc.html)
Provides functions for rendering your pages using pandoc, with a varying
degree of high-levelness.
* [Hakyll.Web.Template](/reference/Hakyll-Web-Template.html)
Templates specify how to take the content of an item and turn it into HTML
output.
* [Hakyll.Web.Template.Context](/reference/Hakyll-Web-Template-Context.html)
You can't do much with a `Template` if you don't have a `Context`: this
module provides some predefined `Context`s and the tools to build your own.
* [Hakyll.Main](/reference/Hakyll-Main.html)
The main `hakyll` function that runs the whole show. There is also a
`hakyllWith` function which allows for a custom configuration.
## Pre-packaged solutions
These modules contain some "pre-packaged" solutions for common situations. They
can be used as-is, or their source can be used as inspiration for your own
tools.
* [Hakyll.Web.Template.List](/reference/Hakyll-Web-Template-List.html)
Combine several pages into a list, such as a list of posts, images in a
gallery, etc.
* [Hakyll.Web.Feed](/reference/Hakyll-Web-Feed.html)
Create RSS feeds.
* [Hakyll.Web.Tags](/reference/Hakyll-Web-Tags.html)
Work with tags and categories.
## Useful utilities
* [Hakyll.Core.UnixFilter](/reference/Hakyll-Core-UnixFilter.html)
Use any unix utility as a compiler.
* [Hakyll.Core.Util.String](/reference/Hakyll-Core-Util-String.html)
A few utility functions for working with `String`s (trim spaces, find and
replace, split on regexp).
## Advanced customization
* [Hakyll.Core.Writable](/reference/Hakyll-Core-Writable.html)
The `Writable` class is for resources which can be written to disk as part
of the output site. You can specify how to write your own custom types to
disk by giving them a `Writable` instance.
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