[hakyll] How do I get only the title & url? (Need to avoid a dependency cycle)

[a***@gmail.com]

I have a box of icons that link to areas of expertise. I use these on /,
but I also want to use them on every individual expertise
(expertise/*.markdown). To generate them in index.markdown, I need:
exps <- loadAll "expertise/*.markdown"

But this will not work when generating "expertise/*.markdown", because it
will create a dependency cycle.

How can I include my expertise-list in the expertise/*.markdowns? I only
need the title and url of each expertise, so maybe there's a way to make
them and not the body?

Here is the relevant code (it's short):
templates/expertise-list.markdown: http://lpaste.net/8836702036775927808
templates/expertise.markdown: http://lpaste.net/5854113189783928832
/index.markdown and expertise/*.markdown:
http://lpaste.net/906605211785625600

Any help would be awesome. Right now I generate the icons for /, and just
copy the generated src into the expertise template, which is beyond stupid.

[Jasper Van der Jeugt]

Hello,

There are two approaches to do this.

1. Compile the items twice, using different versions [1]. One version is
actually shown on your site, and the other version is just for
extracting the info you need in the actual version.

In this case, however, since you don't need the page body, there is a
much simpler approach:

2. Just get the metadata for all items using `getMatches`/`getMetadata`.
I took the following snippet from the example site generated by
`hakyll-init`:

match "posts/*" $ do
route $ setExtension "html"
compile $ pandocCompiler

Post by a***@gmail.com

= loadAndApplyTemplate "templates/post.html" postCtx
= loadAndApplyTemplate "templates/default.html" postCtx
= relativizeUrls

Let's show how you can grab the metadata here:

match "posts/*" $ do
route $ setExtension "html"
compile $ do
posts <- getMatches "posts/*"
metadatas <- mapM getMetadata posts

-- Do something with metadatas here to put it in `postCtx`.

pandocCompiler

Post by a***@gmail.com

= loadAndApplyTemplate "templates/post.html" postCtx
= loadAndApplyTemplate "templates/default.html" postCtx
= relativizeUrls

This should be easily adapted to your site?

[1]: http://jaspervdj.be/hakyll/tutorials/06-versions.html

Hope this helps,
Peace,
Jasper

Post by a***@gmail.com
I have a box of icons that link to areas of expertise. I use these on /,
but I also want to use them on every individual expertise
exps <- loadAll "expertise/*.markdown"
But this will not work when generating "expertise/*.markdown", because it
will create a dependency cycle.
How can I include my expertise-list in the expertise/*.markdowns? I only
need the title and url of each expertise, so maybe there's a way to make
them and not the body?
templates/expertise-list.markdown: http://lpaste.net/8836702036775927808
templates/expertise.markdown: http://lpaste.net/5854113189783928832
http://lpaste.net/906605211785625600
Any help would be awesome. Right now I generate the icons for /, and just
copy the generated src into the expertise template, which is beyond stupid.
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[a***@gmail.com]

Thank you!

The second approach seems sound. I have a function for converting every
expertise/*.markddown to HTML:

mdToHtml :: String -> Rules ()
mdToHtml t = do
route $ setExtension "html"
compile $ pandocCompiler

= loadAndApplyTemplate (fromFilePath $ "templates/" ++ t ++

".markdown")
(defaultContext <> fixAmpField)

= renderPandoc
= loadAndApplyTemplate "templates/default.html" defaultContext
= relativizeUrls

I can get the metadata in here by doing:

compile $ do
ms <- getMatches (fromGlob $ t ++ "/*")
md <- mapM getMetadata ms

... before the pandocCompiler. But I don't understand what I need to do to
be able to use:

$partial("templates/expertise-list.markdown")$

... in expertise/*.markdown.

I need $expertise$ to be generated with $title$ and $url. I thought I could
do something like this (albeit cleaner):

let ctx = listField t (defaultContext <> fixAmpField)
(return ((fromMaybe "" . M.lookup "title") <$> md)
<> return ((fromMaybe "" . M.lookup "url") <$>
md))
<> defaultContext

But that says that it couldn't match [Char] with Hakyll.Core.Item.Item
String (on md).

Maybe this is the wrong approach altogether though. I just need $expertise$
so that I can use it like this:

$for(expertise)$
<div class="icon">
<a style="text-decoration: none;" href="$url$">
<img src="/images/$fixAmp(title)$-icon.svg" width="64vmin" class="inactive">
<img src="/images/$fixAmp(title)$-icon-active.svg" width="64vmin"
class="active">
$title$
</a>
</div>
$endfor$

... in /templates/expertise-list.markdown.

Any ideas?

[a***@gmail.com]

By the way, I was able to make it work just fine using versions. That's, as
you observed, a bit of an overkill though.