compiler: add "portable" target

This adds a build flag for generating a portable version of the compiler
binary which make it look in its own runtime directory for its assets.

This is useful in particular for the portable release tarballs which
contain the web viewer at the same location instead of a pre-defined one
in the FHS.

GitHub: closes #286

1 files changed, 13 insertions, 16 deletions

diff --git a/compiler/app/Main.hs b/compiler/app/Main.hs
index dc97b38..3e6f254 100644
--- a/compiler/app/Main.hs
+++ b/compiler/app/Main.hs
@@ -19,7 +19,7 @@
 module Main where
 
 import GHC.Generics (Generic)
-import Paths_ldgallery_compiler (version, getDataFileName)
+import Paths_ldgallery_compiler (version)
 import Control.Monad (when)
 import Data.Functor ((<&>))
 import Data.Maybe (isJust)
@@ -31,7 +31,7 @@ import System.Console.CmdArgs
 
 import Compiler
 import Files (readDirectory, copyTo, remove)
-
+import ViewerDist (viewerDistPath)
 
 newtype ViewerConfig = ViewerConfig
   { galleryRoot :: String
@@ -106,10 +106,7 @@ main =
   do
     opts <- cmdArgs options
     buildGallery opts
-
-    when (isJust $ withViewer opts) $ do
-      viewerDist <- viewerDistPath $ withViewer opts
-      deployViewer viewerDist opts
+    deployViewer opts
 
   where
     gallerySubdir :: String
@@ -118,11 +115,6 @@ main =
     viewerConfig :: ViewerConfig
     viewerConfig = ViewerConfig (gallerySubdir ++ "/")
 
-    viewerDistPath :: Maybe FilePath -> IO FilePath
-    viewerDistPath (Just "") = getDataFileName "viewer"
-    viewerDistPath (Just dist) = return dist
-    viewerDistPath Nothing = fail "No viewer distribution"
-
     buildGallery :: Options -> IO ()
     buildGallery opts =
       checkDistinctPaths (inputDir opts) (outputDir opts)
@@ -146,10 +138,11 @@ main =
           | isJust withViewer = outputDir </> gallerySubdir
           | otherwise = outputDir
 
-    deployViewer :: FilePath -> Options -> IO ()
-    deployViewer distPath Options{outputDir, cleanOutput} =
+    deployViewer :: Options -> IO ()
+    deployViewer Options{withViewer = Nothing} = pure ()
+    deployViewer Options{withViewer = Just viewerPath, outputDir, cleanOutput} =
       when cleanOutput (cleanViewerDir outputDir)
-      >> copyViewer distPath outputDir
+      >> viewerDistOr viewerPath >>= deployTo outputDir
       >> writeJSON (outputDir </> "config.json") viewerConfig
 
       where
@@ -159,8 +152,12 @@ main =
           <&> filter (/= gallerySubdir)
           >>= mapM_ (remove . (target </>))
 
-        copyViewer :: FilePath -> FilePath -> IO ()
-        copyViewer dist target =
+        viewerDistOr :: FilePath -> IO FilePath
+        viewerDistOr "" = viewerDistPath
+        viewerDistOr custom = pure custom
+
+        deployTo :: FilePath -> FilePath -> IO ()
+        deployTo target dist =
           putStrLn "Copying viewer webapp"
           >>  readDirectory dist
           >>= copyTo target