The lucid package

[ Tags: bsd3, library, web ] [ Propose Tags ]

Clear to write, read and edit DSL for HTML. See the Lucid module for description and documentation.


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Versions 0.0, 0.1, 0.2, 0.3, 0.4, 1.0, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6.0, 2.6.1, 2.7.0, 2.8.0, 2.8.1, 2.9.0, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6, 2.9.7, 2.9.8, 2.9.8.1, 2.9.9
Change log CHANGELOG.md
Dependencies base (>=4.5 && <5), blaze-builder, bytestring, containers, hashable, mmorph, mtl, semigroups, text, transformers, unordered-containers [details]
License BSD3
Copyright 2014-2017 Chris Done
Author Chris Done
Maintainer chrisdone@gmail.com, oleg.grenrus@iki.fi
Category Web
Home page https://github.com/chrisdone/lucid
Uploaded Wed Oct 4 16:52:38 UTC 2017 by phadej
Distributions Debian:2.9.4, LTSHaskell:2.9.9, NixOS:2.9.9, Stackage:2.9.9, openSUSE:2.9.9
Downloads 12439 total (256 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2017-10-04 [all 1 reports]
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Readme for lucid-2.9.9

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lucid Hackage Build Status

Clear to write, read and edit DSL for writing HTML

Documentation

lucid-from-html will convert html to the lucid DSL, though it is experimental.

Introduction

HTML terms in Lucid are written with a postfix ‘_’ to indicate data rather than code. Some examples:

p_, class_, table_, style_

See Lucid.Html5 for a complete list of Html5 combinators.

Plain text is written using the OverloadedStrings and ExtendedDefaultRules extensions, and is automatically escaped:

λ> "123 < 456" :: Html ()
123 &lt; 456

Elements nest by function application:

λ> table_ (tr_ (td_ (p_ "Hello, World!"))) :: Html ()
<table><tr><td><p>Hello, World!</p></td></tr></table>

Elements are juxtaposed via monoidal append:

λ> p_ "hello" <> p_ "sup" :: Html ()
<p>hello</p><p>sup</p>

Or monadic sequencing:

λ> div_ (do p_ "hello"; p_ "sup") :: Html ()
<div><p>hello</p><p>sup</p></div>

Attributes are set by providing an argument list:

λ> p_ [class_ "brand"] "Lucid Inc" :: Html ()
<p class="brand">Lucid Inc</p>

Here is a fuller example of Lucid:

table_ [rows_ "2"]
       (tr_ (do td_ [class_ "top",colspan_ "2",style_ "color:red"]
                    (p_ "Hello, attributes!")
                td_ "yay!"))
<table rows="2">
  <tr>
    <td style="color:red" colspan="2" class="top">
      <p>Hello, attributes!</p>
    </td>
    <td>yay!</td>
  </tr>
</table>

Rendering

For proper rendering you can easily run some HTML immediately with:

λ> renderText (p_ "Hello!")
"<p>Hello!</p>"

Or to bytes:

λ> renderBS (p_ [style_ "color:red"] "Hello!")
"<p style=\"color:red\">Hello!</p>"

For ease of use in GHCi, there is a Show instance, as demonstrated above.

If the above rendering functions aren't suited for your purpose, you can run the monad directly via execHtml and use the more low-level blaze Builder, which has a plethora of output modes in Blaze.ByteString.Builder.

See the documentation for the Lucid module for information about using it as a monad transformer.

Transforming

You can use lift to call parent monads.

λ> runReader (renderTextT (html_ (body_ (do name <- lift ask
                                            p_ [class_ "name"] (toHtml name)))))
             ("Chris" :: String)
"<html><body><p class=\"name\">Chris</p></body></html>"