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Last week I was asked to review a draft of a blog post:
Maxfield Chen@_nihliphobe
@RiccardoOdone I just found your blog and am really digging your Haskell content. I'm working on a blog explaining property based testing options, could I ask you to take a look at it? I'd love your feedback / opinion :)20:33 PM - 13 May 2020
That made me realize I don't have a way to do a similar trick. However, last week I worked on "Adding published to Hakyll Posts". Thus, I already did the hard work on understanding the internals, so I could just sit back and code it.
Up until now the blog worked as follows:
- Published posts were compiled by Hakyll to
posts/*. - Drafts were not compiled except when
HAKYLL_ENVwas set todevelopment.
With the new changes:
- All posts are compiled by Hakyll.
- Published posts are compiled to
posts/*and appear in the archive. - Drafts are compiled to
drafts/posts/*but do not appear in the archive.
In particular, only published posts are compiled to posts/*:
- matchMetadata "posts/*" (isDevelopmentOrPublished env) $ do
+ matchMetadata "posts/*" isPublished $ do
route $ setExtension "html"
Drafts are compiled to drafts/posts/*. Also, when compiling the URL to the draft is printed:
matchMetadata "posts/*" (not . isPublished) $ do
let draftPath = ("drafts/" <>) . (`replaceExtension` "html") . toFilePath
route . customRoute $ draftPath
let putDraftUrl path =
traverse_
(unsafeCompiler . putStrLn)
[ "----DRAFT----",
(previewUrl <>) . draftPath . itemIdentifier $ path,
"-------------"
]
compile $
pandocCompiler
>>= loadAndApplyTemplate "templates/post.html" postCtx
>>= loadAndApplyTemplate "templates/default.html" postCtx
>>= relativizeUrls
>>= (\x -> putDraftUrl x >> pure x)
In the archive only published posts are included except when in development:
create ["archive.html"] $ do
route idRoute
compile $ do
- posts <- recentFirst =<< loadAll "posts/*"
+ posts <- recentFirst =<< loadAllPublished env "posts/*"
loadAllPublished :: (Binary a, Typeable a) => [(String, String)] -> Pattern -> Compiler [Item a]
loadAllPublished env pattern_ = if isDevelopmentEnv env then all else published
where
all = loadAll pattern_
published = publishedIds pattern_ >>= traverse load
isDevelopmentEnv env = lookup "HAKYLL_ENV" env == Just "development"
A similar change appears in the Atom feed code:
- =<< loadAllSnapshots "posts/*" "content"
+ =<< loadAllSnapshotsPublished "posts/*" "content"
loadAllSnapshotsPublished :: (Binary a, Typeable a) => Pattern -> Snapshot -> Compiler [Item a]
loadAllSnapshotsPublished pattern_ snapshot = publishedIds pattern_ >>= traverse (`loadSnapshot` snapshot)
publishedIds :: MonadMetadata m => Pattern -> m [Identifier]
publishedIds = fmap (fmap fst . filter (isPublished . snd)) . getAllMetadata
As always, feel free to go ahead and grab the code.
The draft I ended up reviewing was "Functional Fika — Nix and Haskell". Thanks Maxfield for the inspiration and for teaching me what fika is! ☕️
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