Escape starting periods in ms writer code blocks

If a line of ms code block output starts with a period (.), it should
be prepended by '\&' so that it is not interpreted as a roff command.

Fixes #6505

1 files changed, 37 insertions, 0 deletions

diff --git a/test/Tests/Writers/Ms.hs b/test/Tests/Writers/Ms.hs
new file mode 100644
index 000000000..d73603314
--- /dev/null
+++ b/test/Tests/Writers/Ms.hs
@@ -0,0 +1,37 @@
+{-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE OverloadedStrings #-}
+module Tests.Writers.Ms (tests) where
+
+import Prelude
+import Test.Tasty
+import Tests.Helpers
+import Text.Pandoc
+import Text.Pandoc.Builder
+
+infix 4 =:
+(=:) :: (ToString a, ToPandoc a)
+     => String -> (a, String) -> TestTree
+(=:) = test (purely (writeMs def . toPandoc))
+
+tests :: [TestTree]
+tests = [ testGroup "code blocks"
+          [ "basic"
+              =: codeBlock "hello"
+              =?> unlines
+              [ ".IP"
+              , ".nf"
+              , "\\f[C]"
+              , "hello"
+              , "\\f[]"
+              , ".fi"]
+          , "escape starting ."
+              =: codeBlock ". hello"
+              =?> unlines
+              [ ".IP"
+              , ".nf"
+              , "\\f[C]"
+              , "\\&. hello"
+              , "\\f[]"
+              , ".fi"]
+          ]
+        ]