fix: handle relative paths for haskell-language-server

This is needed for both `cabal build hledger-web` and
`haskell-language-server` to succeed. This was already done in the
heldger-cli package for example but not in the heldger-web package. In
essence, hls and stack/cabal uses different roots when embedding files
in template haskell in sub-packages.

Reference: haskell/haskell-language-server#481 (comment)

hledger-web/Hledger/Web/Foundation.hs

@@ -19,6 +19,7 @@ import Control.Applicative ((<|>))
 import Control.Monad (join, when)
 import qualified Data.ByteString.Char8 as BC
 import Data.Traversable (for)
+import Data.FileEmbed (makeRelativeToProject)
 import Data.IORef (IORef, readIORef, writeIORef)
 import Data.Maybe (fromMaybe)
 import Data.Text (Text)
@@ -82,7 +83,7 @@ data App = App
 -- for our application to be in scope. However, the handler functions
 -- usually require access to the AppRoute datatype. Therefore, we
 -- split these actions into two functions and place them in separate files.
-mkYesodData "App" $(parseRoutesFile "config/routes")
+mkYesodData "App" $(makeRelativeToProject "config/routes" >>= parseRoutesFile)
 
 -- | A convenience alias.
 type AppRoute = Route App
@@ -164,7 +165,7 @@ instance Yesod App where
       addScript $ StaticR hledger_js
       $(widgetFile "default-layout")
 
-    withUrlRenderer $(hamletFile "templates/default-layout-wrapper.hamlet")
+    withUrlRenderer $(makeRelativeToProject "templates/default-layout-wrapper.hamlet" >>= hamletFile)
 
 #ifndef DEVELOPMENT
   -- This function creates static content files in the static folder

hledger-web/Hledger/Web/Settings/StaticFiles.hs

@@ -5,6 +5,7 @@ import System.IO (stdout, hFlush)
 import Yesod.Static (Static, embed, publicFiles, staticDevel)
 
 import Hledger.Web.Settings (staticDir, development)
+import Data.FileEmbed (makeRelativeToProject)
 
 -- | use this to create your static file serving site
 -- staticSite :: IO Static.Static
@@ -26,6 +27,6 @@ staticSite =
             staticDevel staticDir)
    else (do
             -- putStrLn "Using built-in web files" >> hFlush stdout
-            return $(embed staticDir))
+            return $(makeRelativeToProject staticDir >>= embed))
 
-$(publicFiles staticDir)
+$(makeRelativeToProject staticDir >>= publicFiles)

hledger-web/Hledger/Web/Widget/Common.hs

@@ -19,6 +19,7 @@ module Hledger.Web.Widget.Common
   , replaceInacct
   ) where
 
+import Data.FileEmbed (makeRelativeToProject)
 import Data.Foldable (find, for_)
 import Data.List (elemIndex)
 import Data.Text (Text)
@@ -79,7 +80,7 @@ helplink topic label _ = H.a ! A.href u ! A.target "hledgerhelp" $ toHtml label
 -- | Render a "BalanceReport" as html.
 balanceReportAsHtml :: Eq r => (r, r) -> r -> Bool -> Journal -> Text -> [QueryOpt] -> BalanceReport -> HtmlUrl r
 balanceReportAsHtml (journalR, registerR) here hideEmpty j q qopts (items, total) =
-  $(hamletFile "templates/balance-report.hamlet")
+  $(makeRelativeToProject "templates/balance-report.hamlet" >>= hamletFile)
   where
     l = ledgerFromJournal Any j
     indent a = preEscapedString $ concat $ replicate (2 + 2 * a) " "

hledger-web/hledger-web.cabal

@@ -169,6 +169,7 @@ library
     , data-default
     , directory >=1.2.3.0
     , extra >=1.6.3
+    , file-embed >=0.0.10
     , filepath
     , hjsmin
     , hledger >=1.23.99 && <1.24