Add verbose output marker for show-build-info

Simplifies writing tests for show-build-info

Add trailing path separator to make testing simpler.

Cabal/src/Distribution/Simple/ShowBuildInfo.hs

@@ -80,6 +80,8 @@ import Distribution.Types.TargetInfo
 import Distribution.Text
 import Distribution.Pretty
 
+import System.FilePath (addTrailingPathSeparator)
+
 -- | Construct a JSON document describing the build information for a
 -- package.
 mkBuildInfo
@@ -133,7 +135,7 @@ mkComponentInfo wdir pkg_descr lbi clbi = JsonObject $
   , "modules"       .= JsonArray (map (JsonString . T.pack . display) modules)
   , "src-files"     .= JsonArray (map (JsonString . T.pack) sourceFiles)
   , "hs-src-dirs"   .= JsonArray (map (JsonString . T.pack . prettyShow) $ hsSourceDirs bi)
-  , "src-dir"       .= JsonString (T.pack wdir)
+  , "src-dir"       .= JsonString (T.pack $ addTrailingPathSeparator wdir)
   ] <> cabalFile
   where
     name = componentLocalName clbi

cabal-install/src/Distribution/Client/CmdShowBuildInfo.hs

@@ -23,7 +23,7 @@ import Distribution.Simple.Command
 import Distribution.Verbosity
          ( Verbosity, silent )
 import Distribution.Simple.Utils
-         ( wrapText )
+         ( wrapText, withOutputMarker )
 
 import qualified Data.Map as Map
 import Distribution.Client.ProjectPlanning.Types
@@ -122,12 +122,12 @@ showBuildInfoAction flags@NixStyleFlags { extraFlags = (ShowBuildInfoFlags fileO
       components = map JsonRaw componentBuildInfos
       fields = mkBuildInfo' compilerInfo components
       json = JsonObject $ fields <>
-        [ ("project-root", JsonString (T.pack (distProjectRootDirectory (distDirLayout baseCtx))))
+        [ ("project-root", JsonString (T.pack (addTrailingPathSeparator $ distProjectRootDirectory (distDirLayout baseCtx))))
         ]
       res = renderJson json ""
 
   case fileOutput of
-    Nothing -> T.putStrLn res
+    Nothing -> T.putStrLn $ T.pack $ withOutputMarker verbosity (T.unpack res)
     Just fp -> T.writeFile fp res
 
   where