How to compile and load a file at the same time?

[tobiasBora]

Hello,

I'm implementing a function partialWithContextJSONFile that takes two parameters: $partialWithContextJSONFile("mytemplate.html", "myenv.json")$, where myenv.json is a file containing a json file that will be used as a context. So to load that file in my functionField definition, I use:

jsonBody <- B.fromString <$> loadBody (fromFilePath pathJson)
let eitherJson = Aeson.eitherDecodeStrict' jsonBody

but for this to work, I need to do:

match "menu.json" $ do
        compile getResourceBody

in the place where I define all the rules, otherwise I get an error:

Hakyll.Core.Compiler.Require.load: menu.json (snapshot _final) was not found in the cache, the cache might be corrupted or the item you are referring to might not exist

The thing is that I'd prefer to do the compilation directly in the functionField part. Any idea how I could do that? For now, here is the first part of my Context function:

partialWithContextJSONFile :: Context String
partialWithContextJSONFile = functionField "partialWithContextJSONFile" $ \args page -> do
  case args of
    [pathTemplate, pathJson] -> do
      template <- loadBody (fromFilePath pathTemplate)
      jsonBody <- B.fromString <$> loadBody (fromFilePath pathJson)
      let eitherJson = Aeson.eitherDecodeStrict' jsonBody
      [...]

Thanks!

-- EDIT --
It may be related to #802 ?

[Minoru]

loadBody is for Items. How about Prelude.readFile, or an alternative from bytestring or text packages?

[tobiasBora]

Thanks for your answer. I used a similar solutions before (I was using directly the Aeson function to load files + unsafeCompiler to perform the IO), but my issue is that it seems that the compiler does not notify the changes on the .json file (need to restart the server and clear the cache), so I guess that I need somehow to say "oh, if that files changes, then recompile me".

[Minoru]

I guess that I need somehow to say "oh, if that files changes, then recompile me".

As far as I understand, match does precisely that. Without it, Hakyll has no idea about the file, and doesn't track its state.