Added a --quiet option to suppress warnings.

Use this also in Tests.Old.

MANUAL.txt

@@ -340,6 +340,10 @@ General options
 :   Give verbose debugging output.  Currently this only has an effect
     with PDF output.
 
+`--quiet`
+
+:   Suppress warning messages.
+
 `--list-input-formats`
 
 :   List supported input formats, one per line.

pandoc.hs

@@ -197,6 +197,7 @@ data Opt = Opt
     , optDumpArgs          :: Bool    -- ^ Output command-line arguments
     , optIgnoreArgs        :: Bool    -- ^ Ignore command-line arguments
     , optVerbose           :: Bool    -- ^ Verbose diagnostic output
+    , optQuiet             :: Bool    -- ^ Suppress warnings
     , optReferenceLinks    :: Bool    -- ^ Use reference links in writing markdown, rst
     , optReferenceLocation :: ReferenceLocation -- ^ location for footnotes and link references in markdown output
     , optDpi               :: Int     -- ^ Dpi
@@ -262,6 +263,7 @@ defaultOpts = Opt
     , optDumpArgs              = False
     , optIgnoreArgs            = False
     , optVerbose               = False
+    , optQuiet                 = False
     , optReferenceLinks        = False
     , optReferenceLocation     = EndOfDocument
     , optDpi                   = 96
@@ -904,6 +906,11 @@ options =
                   (\opt -> return opt { optVerbose = True }))
                  "" -- "Verbose diagnostic output."
 
+    , Option "" ["quiet"]
+                 (NoArg
+                  (\opt -> return opt { optQuiet = True }))
+                 "" -- "Suppress warnings."
+
     , Option "" ["bash-completion"]
                  (NoArg
                   (\_ -> do
@@ -1188,6 +1195,7 @@ convertWithOpts opts args = do
               , optDumpArgs              = dumpArgs
               , optIgnoreArgs            = ignoreArgs
               , optVerbose               = verbose
+              , optQuiet                 = quiet
               , optReferenceLinks        = referenceLinks
               , optReferenceLocation     = referenceLocation
               , optDpi                   = dpi
@@ -1407,6 +1415,11 @@ convertWithOpts opts args = do
                                then handleIncludes
                                else return . Right
 
+  let runIO' = runIOorExplode .
+               (if quiet
+                   then id
+                   else withWarningsToStderr)
+
   let sourceToDoc :: [FilePath] -> IO (Pandoc, MediaBag)
       sourceToDoc sources' = 
         case reader of
@@ -1414,13 +1427,11 @@ convertWithOpts opts args = do
             srcs <- convertTabs . intercalate "\n" <$> readSources sources'
             doc <- handleIncludes' srcs
             case doc of
-              Right doc' -> runIOorExplode $ withMediaBag
-                                           $ withWarningsToStderr
+              Right doc' -> runIO' $ withMediaBag
                                    $ r readerOpts doc'
               Left e -> error $ show e
           ByteStringReader r -> readFiles sources' >>=
-                                (\bs -> runIOorExplode $ withMediaBag
-                                                       $ withWarningsToStderr
+                                (\bs -> runIO' $ withMediaBag
                                                $ r readerOpts bs)
 
   -- We parse first if (1) fileScope is set, (2), it's a binary
@@ -1493,8 +1504,7 @@ convertWithOpts opts args = do
 
   case writer of
     -- StringWriter f -> f writerOptions doc' >>= writerFn outputFile
-    ByteStringWriter f -> (runIOorExplode $ withWarningsToStderr
-                                          $ f writerOptions doc')
+    ByteStringWriter f -> (runIO' $ f writerOptions doc')
                                           >>= writeFnBinary outputFile
     StringWriter f
       | pdfOutput -> do
@@ -1529,6 +1539,5 @@ convertWithOpts opts args = do
                   handleEntities = if htmlFormat && ascii
                                    then toEntities
                                    else id
-              output <- runIOorExplode $ withWarningsToStderr
-                                       $ f writerOptions doc'
+              output <- runIO' $ f writerOptions doc'
               selfcontain (output ++ ['\n' | not standalone']) >>= writerFn outputFile . handleEntities

tests/Tests/Old.hs

@@ -261,7 +261,7 @@ testWithNormalize normalizer testname opts inp norm = testCase testname $ do
   (outputPath, hOut) <- openTempFile "" "pandoc-test"
   let inpPath = inp
   let normPath = norm
-  let options = ["--data-dir", ".." </> "data"] ++ [inpPath] ++ opts
+  let options = ["--quiet", "--data-dir", ".." </> "data"] ++ [inpPath] ++ opts
   let cmd = pandocPath ++ " " ++ unwords options
   let findDynlibDir [] = Nothing
       findDynlibDir ("build":xs) = Just $ joinPath (reverse xs) </> "build"