This is a slug implementation that plays nicely with the Yesod ecosystem. Although it’s fairly easy to write this thing, slugs are useful and general enough to be coded once and be used again and again. So this little package eliminates some boilerplate you might find yourself writing.
The package provides the data type
Slug that is an instance of various
type classes, so it can be used with Persistent or as a part of a route. It
also works with the
The slugs are completely type-safe. When you have a
Slug, you can be sure
that there is a valid slug inside. Valid slug has the following qualities:
it’s not empty;
it consists only of alpha-numeric groups of characters (words) separated by
'-'dashes in such a way that entire slug cannot start or end in a dash and also two dashes in a row cannot be found;
every character with defined notion of case is lower-cased.
To use the package with persistent models, just import
Web.Slug and add it
to model file:
MyEntity slug Slug …
Use it in route file like this:
/post/#Slug PostR GET
In Haskell code, create slugs from
mkSlug and extract their
textual representation with
unSlug. The following property holds:
mkSlug = mkSlug >=> mkSlug . unSlug
Copyright © 2015–2017 Mark Karpov
Distributed under BSD 3 clause license.
Improved documentation and metadata.
Allowed Aeson 1.1.
Switched to Hspec for test suite.
Drop support for GHC 7.6.
Started to use the derived
SlugException. Human-friendly version goes to
Added instances of
- Allow Aeson 1.0.
- Export plain function
unSluginstead of record selector
- Improved error messages in
Functions (including instance methods) that parse
Textthat must be formatted as valid slug are case-sensitive now.
- Initial release.