Man writer: Fix some spacing issues around links.

See #9120.

We need to use `\c` before a `.UR` or `.MT`, to avoid
an extra space, and also after.  To ensure that a space
at the beginning of the following line doesn't get swallowed
up, we escape it with `\`.

src/Text/Pandoc/Writers/Man.hs

@@ -311,8 +311,8 @@ inlineToMan _ il@(RawInline f str)
       return empty
 inlineToMan _ LineBreak = return $
   cr <> literal ".PD 0" $$ literal ".P" $$ literal ".PD" <> cr
-inlineToMan _ SoftBreak = return space
-inlineToMan _ Space = return space
+inlineToMan _ SoftBreak = return $ afterBreak "\\" <> space
+inlineToMan _ Space = return $ afterBreak "\\" <> space
 inlineToMan opts (Link _ txt (src, _))
   | not (isURI src) = inlineListToMan opts txt -- skip relative links
   | otherwise       = do
@@ -323,7 +323,7 @@ inlineToMan opts (Link _ txt (src, _))
   let (start, end) = if "mailto:" `T.isPrefixOf` src
                         then (".MT", ".ME")
                         else (".UR", ".UE")
-  return $ cr
+  return $ "\\c" <> cr -- \c avoids extra space
         $$ (start <+> literal srcSuffix)
         $$ linktext
         $$ (end <+> "\\c" <> cr)  -- \c avoids space after

src/Text/Pandoc/Writers/Shared.hs

@@ -50,7 +50,7 @@ import Safe (lastMay)
 import qualified Data.ByteString.Lazy as BL
 import Control.Monad (zipWithM)
 import Data.Aeson (ToJSON (..), encode)
-import Data.Char (chr, ord, isSpace, isLetter)
+import Data.Char (chr, ord, isSpace, isLetter, isUpper)
 import Data.List (groupBy, intersperse, transpose, foldl')
 import Data.List.NonEmpty (NonEmpty(..), nonEmpty)
 import Data.Text.Conversions (FromText(..))
@@ -552,10 +552,10 @@ splitSentences :: Doc Text -> Doc Text
 splitSentences = go . toList
  where
   go [] = mempty
-  go (Text len t : BreakingSpace : xs) =
-     if isSentenceEnding t
-        then Text len t <> NewLine <> go xs
-        else Text len t <> BreakingSpace <> go xs
+  go (Text len t : AfterBreak _ : BreakingSpace : xs)
+    | isSentenceEnding t = Text len t <> NewLine <> go xs
+  go (Text len t : BreakingSpace : xs)
+    | isSentenceEnding t = Text len t <> NewLine <> go xs
   go (x:xs) = x <> go xs
 
   toList (Concat (Concat a b) c) = toList (Concat a (Concat b c))

test/command/8508.md

@@ -8,10 +8,12 @@ SEE ALSO
 ^D
 .SH SEE ALSO
 .IP \[bu] 2
+\c
 .UR https://en.wikipedia.org/wiki/Milk
 Milk
 .UE \c
 .IP \[bu] 2
+\c
 .UR https://en.wikipedia.org/wiki/Extended_Backus–Naur_form
 EBNF
 .UE \c

test/writer.man

@@ -483,9 +483,9 @@ So is `pine.'
 .PP
 `He said, \[lq]I want to go.\[rq]' Were you alive in the 70\[cq]s?
 .PP
-Here is some quoted `\f[CR]code\f[R]' and a \[lq]quoted
-link
+Here is some quoted `\f[CR]code\f[R]' and a \[lq]\c
 .UR http://example.com/?foo=1&bar=2
+quoted link
 .UE \c
 \[rq].
 .PP
@@ -604,7 +604,10 @@ URL and title
 .PP
 with_underscore
 .PP
-Email link (mailto:nobody@nowhere.net)
+\c
+.MT nobody@nowhere.net
+Email link
+.ME \c
 .PP
 Empty.
 .SS Reference
@@ -630,39 +633,40 @@ Foo bar.
 .PP
 Foo biz.
 .SS With ampersands
-Here\[cq]s a link with an ampersand in the
-URL
+Here\[cq]s a \c
 .UR http://example.com/?foo=1&bar=2
+link with an ampersand in the URL
 .UE \c
-.
+\&.
 .PP
-Here\[cq]s a link with an amersand in the link text:
+Here\[cq]s a link with an amersand in the link text: \c
 .UR http://att.com/
 AT&T
 .UE \c
-.
+\&.
 .PP
 Here\[cq]s an inline link.
 .PP
 Here\[cq]s an inline link in pointy braces.
 .SS Autolinks
-With an ampersand:
+With an ampersand: \c
 .UR http://example.com/?foo=1&bar=2
-.UE
+.UE \c
 .IP \[bu] 2
 In a list?
 .IP \[bu] 2
+\c
 .UR http://example.com/
 .UE \c
 .IP \[bu] 2
 It should.
 .PP
-An e-mail address:
+An e-mail address: \c
 .MT nobody@nowhere.net
 .ME \c
 .RS
 .PP
-Blockquoted:
+Blockquoted: \c
 .UR http://example.com/
 .UE \c
 .RE
@@ -717,11 +721,11 @@ the first line of each block.
 .SS [3]
 .PP
 This is \f[I]easier\f[R] to type.
-Inline notes may contain links
+Inline notes may contain \c
 .UR http://google.com
+links
 .UE \c
- and \f[CR]]\f[R] verbatim
-characters, as well as [bracketed text].
+\ and \f[CR]]\f[R] verbatim characters, as well as [bracketed text].
 .SS [4]
 .PP
 In quote.