Don't ask to run spago init when config file cannot be found (#1152)

Author: flip111

core/src/Config.purs

@@ -481,5 +481,7 @@ readConfig :: forall a. FilePath -> Spago (LogEnv a) (Either String { doc :: Yam
 readConfig path = do
   logDebug $ "Reading config from " <> path
   FS.exists path >>= case _ of
-    false -> pure (Left $ "Did not find " <> path <> " file.")
+    false -> pure $ Left $ case path of
+      "spago.yaml" -> "Did not find " <> path <> " Run `spago init` to initialise a new project."
+      _ -> "Did not find " <> path
     true -> liftAff $ FS.readYamlDocFile configCodec path

src/Spago/Config.purs

@@ -155,7 +155,7 @@ readWorkspace { maybeSelectedPackage, pureBuild } = do
   -- First try to read the config in the root. It _has_ to contain a workspace
   -- configuration, or we fail early.
   { workspace, package: maybePackage, workspaceDoc } <- Core.readConfig "spago.yaml" >>= case _ of
-    Left err -> die [ "Couldn't parse Spago config, error:\n  " <> err, "Run `spago init` to initialise a new project." ]
+    Left err -> die [ "Couldn't parse Spago config, error:\n  " <> err, "The configuration file help can be found here https://github.com/purescript/spago#the-configuration-file" ]
     Right { yaml: { workspace: Nothing } } -> die
       [ "Your spago.yaml doesn't contain a workspace section."
       , "See the relevant documentation here: https://github.com/purescript/spago#the-workspace"