--json-exceptions

Added a --json-exceptions option, which makes some exceptions be output in json.

The distinction is that --json-error-messages is for messages relating
to a particular ActionItem, while --json-exceptions is for messages that
are not, eg ones for a file that does not exist.

It's unfortunate that we need two switches with such a fine distinction
between them, but I'm worried about maintaining backwards compatability
in the json output, to avoid breaking anything that parses it, and this was
the way to make sure I didn't.

toplevelWarning is generally used for the latter kind of message. And
the other calls to toplevelWarning could be converted to showException. The
only possible gotcha is that if toplevelWarning is ever called after
starting acting on a file, it will add to the --json-error-messages of the
json displayed for that file and converting to showException would be a
behavior change. That seems unlikely, but I didn't convery everything to
avoid needing to satisfy myself it was not a concern.

Sponsored-by: Dartmouth College's Datalad project

Types/Messages.hs

@@ -9,6 +9,7 @@ module Types.Messages where
 
 import qualified Utility.Aeson as Aeson
 import Utility.Metered
+import Utility.RawFilePath
 
 import Control.Concurrent
 import System.Console.Regions (ConsoleRegion)
@@ -26,6 +27,7 @@ data OutputType
 data JSONOptions = JSONOptions
 	{ jsonProgress :: Bool
 	, jsonErrorMessages :: Bool
+	, jsonExceptions :: Bool
 	}
 	deriving (Show)
 
@@ -33,6 +35,7 @@ adjustOutputType :: OutputType -> OutputType -> OutputType
 adjustOutputType (JSONOutput old) (JSONOutput new) = JSONOutput $ JSONOptions
 	{ jsonProgress = jsonProgress old || jsonProgress new
 	, jsonErrorMessages = jsonErrorMessages old || jsonErrorMessages new
+	, jsonExceptions = jsonExceptions old || jsonExceptions new
 	}
 adjustOutputType _old new = new
 
@@ -70,6 +73,7 @@ newMessageState = do
 data SerializedOutput
 	= OutputMessage S.ByteString
 	| OutputError String
+	| OutputException String (Maybe RawFilePath) String
 	| BeginProgressMeter
 	| UpdateProgressMeterTotalSize TotalSize
 	| UpdateProgressMeter BytesProcessed