Don't generate trailing spaces

README.md

@@ -16,40 +16,39 @@ cradle:
   cabal:
     - path: "indexed-profunctors/src"
       component: "lib:indexed-profunctors"
-    
+
     - path: "optics-th/src"
       component: "lib:optics-th"
-    
+
     - path: "optics-th/tests"
       component: "optics-th:test:optics-th-tests"
-    
+
     - path: "optics-vl/src"
       component: "lib:optics-vl"
-    
+
     - path: "codegen/./Subtypes.hs"
       component: "optics-codegen:exe:optics-codegen-subtypes"
-    
+
     - path: "optics-core/src"
       component: "lib:optics-core"
-    
+
     - path: "optics-sop/src"
       component: "lib:optics-sop"
-    
+
     - path: "optics-extra/src"
       component: "lib:optics-extra"
-    
+
     - path: "template-haskell-optics/src"
       component: "lib:template-haskell-optics"
-    
+
     - path: "optics/src"
       component: "lib:optics"
-    
+
     - path: "optics/tests"
       component: "optics:test:optics-tests"
-    
+
     - path: "metametapost/src/Cli.hs"
       component: "metametapost:exe:metametapost-optics"
-    
 
 ```
 

src/Hie/Yaml.hs

@@ -18,7 +18,14 @@ hieYaml sOrC pkgs =
       (sOrC <> ":\n" <> indent' pkgs)
 
 indent' :: String -> String
-indent' = unlines . map ("  " <>) . lines
+indent' =
+  unlines
+    . map
+      ( \l -> case l of
+          "" -> ""
+          _ -> "  " <> l
+      )
+    . lines
 
 cabalComponent :: Name -> Component -> (FilePath, String)
 cabalComponent n (Comp Lib "" p) = (T.unpack p, T.unpack $ "lib:" <> n)