Markdown writer: better rendering of numbers.

If the number is integral, we render it as an integral
not a float.

Closes #5398.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/Text/Pandoc/Writers/Markdown.hs b/src/Text/Pandoc/Writers/Markdown.hs
index 3850dccd2..5f165f7d3 100644
--- a/src/Text/Pandoc/Writers/Markdown.hs
+++ b/src/Text/Pandoc/Writers/Markdown.hs
@@ -29,6 +29,7 @@ import Data.Maybe (fromMaybe)
 import Data.Monoid (Any (..))
 import Data.Ord (comparing)
 import qualified Data.Set as Set
+import qualified Data.Scientific as Scientific
 import Data.Text (Text)
 import qualified Data.Text as T
 import qualified Data.Vector as V
@@ -164,7 +165,9 @@ jsonToYaml (String s) =
        | not (any isPunctuation x) -> text x
        | otherwise     -> text $ "'" ++ substitute "'" "''" x ++ "'"
 jsonToYaml (Bool b) = text $ show b
-jsonToYaml (Number n) = text $ show n
+jsonToYaml (Number n)
+  | Scientific.isInteger n = text $ show (floor n :: Integer)
+  | otherwise              = text $ show n
 jsonToYaml _ = empty
 
 -- | Return markdown representation of document.