I have started learning a bit about the snap framework, I found some tutorial on blaze snap and want to build a little web-app.
The tedious thing when changing code in the html section is that I have to
Ctrl+C the existing Snap server, then cabal run to restart it again is there an easier way to do that.
I found the following util watchr which allows for running a command after a certain file is being changed - which is definitely useful but I don't quite know how to apply it in this situation.
Get a minimal working example - use the snap init barebone command and substitute the src/Main.hs with
{-# LANGUAGE OverloadedStrings #-}
module Main where
import Control.Monad (forM_)
import Control.Applicative ((<|>))
import Snap.Core
import Snap.Util.FileServe
import Snap.Http.Server
import Snap.Blaze (blaze)
import qualified Data.Text as T
import qualified Text.Blaze.Html5 as H
main :: IO ()
main = quickHttpServe site
site :: Snap ()
site =
ifTop testHandler <|>
dir "static" (serveDirectory ".")
testHandler :: Snap ()
testHandler = blaze $ H.docTypeHtml $
do H.head $ H.title "SnaptestBlaze"
H.body $ do H.p "Blaze makes Html"
H.ul $ forM_ [1..10::Int] (H.li . H.toHtml)
and make sure to have snap-blaze and blaze-html in the corresponding *.cabal file.
I also saw that there is a package snap-loader-dynamic which sounds promising, but I could not build the application for the dependencies required and the dependencies in the cabal sandbox had different hash values.
I saw that there exists stack to eventually replace cabal in the long run, but I have not had enough time to check wether stack could do automatic rebuild & restart.
If the environment where I am developing is relevant: Linux (Mint) + cabal-sandbox.
Snap itself comes with this capability built-in. Assuming you initialized your project with snap init, just build your project by
cabal install -fdevelopment
and it will reload itself on the fly as necessary.