Move ttf dumper to a module

app/Main.hs

@@ -15,6 +15,7 @@ import qualified Data.Text.Lazy as Text.Lazy
 import qualified Data.Text.Lazy.IO as Text.Lazy
 import qualified Data.Text.Encoding as Text
 import GHC.Records (HasField(..))
+import Graphics.Fountainhead.Dumper (dumpTrueType)
 -- TODO: kern table since format 1.
 -- For details on subtable format see examples in TrueType reference.
 import Graphics.Fountainhead.Parser
@@ -50,49 +51,17 @@ fontMain fontFile = do
                 }
             , stateParseErrors = []
             }
-        (processedState, Right directory) = Megaparsec.runParser' fontDirectoryP initialState
-
-    Text.Lazy.putStrLn $ Text.Builder.toLazyText $ dumpOffsetTable directory
-    {- print directory
+        (processedState, initialResult) = Megaparsec.runParser' fontDirectoryP initialState 
+    
+    case initialResult >>= dumpTrueType processedState of
+        (Right fontDump) -> Text.Lazy.putStrLn $ Text.Builder.toLazyText fontDump
+        Left e -> putStr (Megaparsec.errorBundlePretty e)
+    {-
     let Just tableDirectory' = find (("OS/2" ==) . tag) $ tableDirectory directory
         tableResult = parseTable tableDirectory' os2TableP processedState
     case tableResult of
-        Left e -> putStr (Megaparsec.errorBundlePretty e)
         Right x -> print x -}
 
-paddedHexadecimal :: Integral a => a -> Text.Builder.Builder
-paddedHexadecimal = ("0x" <>)
-    . Text.Builder.fromLazyText
-    . Text.Lazy.justifyRight 8 '0'
-    . Text.Builder.toLazyText
-    . Text.Builder.hexadecimal
-
-justifyNumber :: Integral a => Int64 -> a -> Text.Builder.Builder
-justifyNumber count = Text.Builder.fromLazyText
-    . Text.Lazy.justifyRight count ' '
-    . Text.Builder.toLazyText
-    . Text.Builder.decimal
-
-dumpOffsetTable :: FontDirectory -> Text.Builder.Builder
-dumpOffsetTable directory
-    = "Offset Table\n------------\n"
-    <> "         sfnt version:           1.0\n         number of tables: "
-    <> Text.Builder.decimal (numTables $ offsetSubtable directory)
-    <> Text.Builder.singleton '\n'
-    <> dumpOffsetSummary (tableDirectory directory)
-  where
-    dumpOffsetSummary = mconcat . fmap dumpOffsetRow . zip [0..]
-    dumpOffsetRow (index, table) = justifyNumber 4 index
-        <> ". '"
-        <> Text.Builder.fromText (Text.decodeASCII $ tag table)
-        <> "' - checksum = "
-        <> paddedHexadecimal (getField @"checkSum" table)
-        <> ", offset = "
-        <> paddedHexadecimal (getField @"offset" table)
-        <> ", len = "
-        <> justifyNumber 9 (getField @"length" table)
-        <> Text.Builder.singleton '\n'
-
 main :: IO ()
 main = do
     programArguments <- getArgs