citeproc - improved removal of final period...

...in citations inside notes in note-based styles.
These citations are put in parentheses, but the final
period must be removed.

See jgm/citeproc#20

src/Text/Pandoc/Citeproc.hs

@@ -524,11 +524,14 @@ deNote (Note bs) = Note $ walk go bs
   go x = x
 deNote x = x
 
--- Note: we can't use dropTextWhileEnd because this would
--- remove the final period on abbreviations like Ibid.
--- But removing a final Str "." is safe.
+-- Note: we can't use dropTextWhileEnd indiscriminately,
+-- because this would remove the final period on abbreviations like Ibid.
+-- But it turns out that when the note citation ends with Ibid.
+-- (or Ed. etc.), the last inline will be Str "" as a result of
+-- the punctuation-fixing mechanism that removes the double '.'.
 removeFinalPeriod :: [Inline] -> [Inline]
 removeFinalPeriod ils =
   case lastMay ils of
-    Just (Str ".") -> initSafe ils
-    _              -> ils
+    Just (Str t)
+      | T.takeEnd 1 t == "." -> initSafe ils ++ [Str (T.dropEnd 1 t)]
+    _ -> ils

test/command/citeproc-20.md

@@ -0,0 +1,25 @@
+```
+% pandoc --citeproc -t plain
+Lorem ipsum dolor sit amet^[Consectetur adipisicing elit: «sed do eiusmod tempor incididunt» [@doe_1989, 15].].
+
+---
+csl: command/chicago-fullnote-bibliography.csl
+suppress-bibliography: true
+references:
+- id: doe_1989
+  author:
+    - family: Doe
+      given: John
+  issued:
+    - year: 1989
+  publisher: ABC
+  publisher-place: New York
+  title: Tempor
+  type: book
+...
+^D
+Lorem ipsum dolor sit amet[1].
+
+[1] Consectetur adipisicing elit: «sed do eiusmod tempor incididunt»
+(John Doe, Tempor (New York: ABC, 1989), 15).
+```