ema

Ema is a next-gen Haskell library for building jamstack-style static sites, with fast hot reload. See ema.srid.ca for documentation.

The simplest Ema app looks like this:

main :: IO ()
main = do
  let name :: Text = "Ema"
  runEmaPure $
    encodeUtf8 $ "<b>Hello</b>, from " <> name

Quick Preview

If you have Nix installed with Flakes, give Ema a test-drive by running it to serve its own documentation:

PORT=8000 nix run github:srid/ema

NOTE: This will work if you have this repo's ./docs directory locally. In future, ema should be made to include the docs in the nix derivation and reference it.

Hacking

Run bin/run (or Ctrl+Shift+B in VSCode). This runs the clock example; modify ./.ghcid to run a different example.

TODO

• MVP
• Implement hot reload, and ditch browser-sync
  • server to client refresh
  • client to server reconnect (on ghcid reload, or accidental client disconnect)
    • or, investigate https://hackage.haskell.org/package/ghci-websockets
• Multi-websocket-client support
• Static site generation mode
• add common examples,
  • filesystem watcher
  • docs site for self (w/ breadcrumbs and possibly even search)

pre-announce,

• CLI UX
  • opts
  • logging
• How to serve non-generated files (css, img, etc.)
• Publish Data.LVar to Hackage
• documentation (howto)
• Avoid tailwind CDN in docs (use twind or windicss) for better lighthouse score

doc notes,

• hot reload fast, morphdom
  • html templates + tailwind for fast style feedback
• use async:race to avoid ghcid ghosts
• tailwind + blaze-html layout (BlazeWind?) for no-frills getting started
• dealing with errors
• messaging re: hakyll
  • safer/ simpler routes system
  • bring your own templates / DSL
• messaging re: svelte
  • SSE