More pleasing presentation of warnings and info messages.

!! warning
-- info

4 files changed, 10 insertions, 9 deletions

diff --git a/src/Text/Pandoc/Class.hs b/src/Text/Pandoc/Class.hs
index 65f8f33d0..bee529bd8 100644
--- a/src/Text/Pandoc/Class.hs
+++ b/src/Text/Pandoc/Class.hs
@@ -111,7 +111,6 @@ import Text.Parsec (ParsecT, getPosition, sourceLine, sourceName)
 import qualified Text.Pandoc.Compat.Time as IO (getCurrentTime)
 import Text.Pandoc.MIME (MimeType, getMimeType, extensionFromMimeType)
 import Text.Pandoc.Definition
-import Data.Char (toLower)
 import Data.Digest.Pure.SHA (sha1, showDigest)
 import Data.Maybe (fromMaybe)
 import Data.Time.Clock.POSIX ( utcTimeToPOSIXSeconds
@@ -513,8 +512,10 @@ instance PandocMonad PandocIO where
   getCommonState = PandocIO $ lift get
   putCommonState x = PandocIO $ lift $ put x
   logOutput msg = liftIO $ do
-    UTF8.hPutStr stderr $ "[" ++
-       map toLower (show (messageVerbosity msg)) ++ "] "
+    UTF8.hPutStr stderr $
+       case messageVerbosity msg of
+           WARNING -> "!! "
+           _       -> ".. "
     alertIndent $ lines $ showLogMessage msg
 
 alertIndent :: [String] -> IO ()
@@ -522,7 +523,7 @@ alertIndent [] = return ()
 alertIndent (l:ls) = do
   UTF8.hPutStrLn stderr l
   mapM_ go ls
-  where go l' = do UTF8.hPutStr stderr "! "
+  where go l' = do UTF8.hPutStr stderr "   "
                    UTF8.hPutStrLn stderr l'
 
 -- | Specialized version of parseURIReference that disallows
diff --git a/test/command/1718.md b/test/command/1718.md
index 401610a7a..f642e64bf 100644
--- a/test/command/1718.md
+++ b/test/command/1718.md
@@ -6,6 +6,6 @@ Note[^1].
 
 [^2]: the second, unused, note.
 ^D
-[warning] Note with key '2' defined at line 5 column 1 but not used.
+!! Note with key '2' defined at line 5 column 1 but not used.
 [Para [Str "Note",Note [Para [Str "the",Space,Str "first",Space,Str "note."]],Str "."]]
 ```
diff --git a/test/command/512.md b/test/command/512.md
index 52e5dbe07..2621c8e27 100644
--- a/test/command/512.md
+++ b/test/command/512.md
@@ -36,7 +36,7 @@ Loop detection:
 
 __ link1_
 ^D
-[warning] Circular reference 'link1' at line 1 column 15
+!! Circular reference 'link1' at line 1 column 15
 <p><a href="">click here</a></p>
 ```
 
diff --git a/test/command/svg.md b/test/command/svg.md
index b48745f9a..5ddde2e56 100644
--- a/test/command/svg.md
+++ b/test/command/svg.md
@@ -2,7 +2,7 @@
 % pandoc -f latex -t icml
 \includegraphics{command/corrupt.svg}
 ^D
-[warning] Could not determine image size for 'command/corrupt.svg': could not determine image type
+!! Could not determine image size for 'command/corrupt.svg': could not determine image type
 <ParagraphStyleRange AppliedParagraphStyle="ParagraphStyle/Paragraph">
   <CharacterStyleRange AppliedCharacterStyle="$ID/NormalCharacterStyle">
     <Rectangle Self="uec" StrokeWeight="0" ItemTransform="1 0 0 1 150 -100">
@@ -35,7 +35,7 @@
 % pandoc -f latex -t icml
 \includegraphics{command/SVG_logo.svg}
 ^D
-[warning] Could not determine image size for 'command/SVG_logo.svg': could not determine SVG size
+!! Could not determine image size for 'command/SVG_logo.svg': could not determine SVG size
 <ParagraphStyleRange AppliedParagraphStyle="ParagraphStyle/Paragraph">
   <CharacterStyleRange AppliedCharacterStyle="$ID/NormalCharacterStyle">
     <Rectangle Self="uec" StrokeWeight="0" ItemTransform="1 0 0 1 150 -100">
@@ -68,7 +68,7 @@
 % pandoc -f latex -t icml
 \includegraphics{command/SVG_logo-without-xml-declaration.svg}
 ^D
-[warning] Could not determine image size for 'command/SVG_logo-without-xml-declaration.svg': could not determine SVG size
+!! Could not determine image size for 'command/SVG_logo-without-xml-declaration.svg': could not determine SVG size
 <ParagraphStyleRange AppliedParagraphStyle="ParagraphStyle/Paragraph">
   <CharacterStyleRange AppliedCharacterStyle="$ID/NormalCharacterStyle">
     <Rectangle Self="uec" StrokeWeight="0" ItemTransform="1 0 0 1 150 -100">