Two citeproc locator/suffix improvements:

- Recognize locators spelled with a capital letter.
  Closes #7323.
- Add a comma and a space in front of the suffix if it doesn't start
  with space or punctuation.  Closes #7324.

src/Text/Pandoc/Citeproc/Locator.hs

@@ -20,7 +20,7 @@ parseLocator :: Locale -> [Inline] -> (Maybe (Text, Text), [Inline])
 parseLocator locale inp =
   case parse (pLocatorWords (toLocatorMap locale)) "suffix" $ splitInp inp of
        Right r -> r
-       Left _  -> (Nothing, inp)
+       Left _  -> (Nothing, maybeAddComma inp)
 
 splitInp :: [Inline] -> [Inline]
 splitInp = splitStrWhen (\c -> isSpace c || (isPunctuation c && c /= ':'))
@@ -42,9 +42,17 @@ pLocatorWords locMap = do
   -- i.e. the first one will be " 9"
   return $
     if T.null la && T.null lo
-       then (Nothing, s)
+       then (Nothing, maybeAddComma s)
        else (Just (la, T.strip lo), s)
 
+maybeAddComma :: [Inline] -> [Inline]
+maybeAddComma [] = []
+maybeAddComma ils@(Space : _) = ils
+maybeAddComma ils@(Str t : _)
+  | Just (c, _) <- T.uncons t
+  , isPunctuation c = ils
+maybeAddComma ils = Str "," : Space : ils
+
 pLocatorDelimited :: LocatorMap -> LocatorParser (Text, Text)
 pLocatorDelimited locMap = try $ do
   _ <- pMatchChar "{" (== '{')
@@ -97,7 +105,7 @@ pLocatorLabel' locMap lim = go ""
           t <- anyToken
           ts <- manyTill anyToken (try $ lookAhead lim)
           let s = acc <> stringify (t:ts)
-          case M.lookup (T.strip s) locMap of
+          case M.lookup (T.toCaseFold $ T.strip s) locMap of
             -- try to find a longer one, or return this one
             Just l -> go s <|> return (l, False)
             Nothing -> go s

test/command/7323.md

@@ -0,0 +1,29 @@
+```
+% pandoc --citeproc -t plain
+---
+references:
+- id: smith
+  author: John Smith
+  issued: 2019
+  title: Insects
+  type: book
+...
+
+@smith [chap. 6]
+
+@smith [chapter 6]
+
+@smith [Chap. 6]
+
+@smith [Chapter 6]
+^D
+John Smith (2019, chap. 6)
+
+John Smith (2019, chap. 6)
+
+John Smith (2019, chap. 6)
+
+John Smith (2019, chap. 6)
+
+John Smith. 2019. Insects.
+```

test/command/7324.md

@@ -0,0 +1,25 @@
+```
+% pandoc --citeproc -t plain
+---
+references:
+- id: smith
+  author: John Smith
+  issued: 2019
+  title: Insects
+  type: book
+...
+
+@smith [, among others]
+
+@smith [ among others]
+
+@smith [among others]
+^D
+John Smith (2019, among others)
+
+John Smith (2019 among others)
+
+John Smith (2019, among others)
+
+John Smith. 2019. Insects.
+```