Fix handling of whitespace at the end of paragraphs and mandatory whitespace in list items.

src/parser/plain_list.rs

@@ -16,8 +16,10 @@ use crate::parser::util::start_of_line;
 use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::character::complete::digit1;
+use nom::character::complete::line_ending;
 use nom::character::complete::one_of;
 use nom::character::complete::space0;
+use nom::character::complete::space1;
 use nom::combinator::eof;
 use nom::combinator::recognize;
 use nom::combinator::verify;
@@ -57,24 +59,42 @@ pub fn plain_list_item<'r, 's>(
 
     let element_matcher = parser_with_context!(element)(&parser_context);
     let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
-    let (remaining, (bull, _ws)) = tuple((bullet, space0))(remaining)?;
-    let (remaining, (contents, _exit_contents)) =
-        many_till(element_matcher, exit_matcher)(remaining)?;
-    let source = get_consumed(input, remaining);
-
-    Ok((
-        remaining,
-        PlainListItem {
-            source,
-            indentation: indent_level,
-            bullet: bull,
-            contents,
-        },
-    ))
+    let (remaining, bull) = bullet(remaining)?;
+    let maybe_contentless_item: Res<&str, &str> = alt((eof, line_ending))(remaining);
+    match maybe_contentless_item {
+        Ok((rem, _ws)) => {
+            let source = get_consumed(input, rem);
+            return Ok((
+                rem,
+                PlainListItem {
+                    source,
+                    indentation: indent_level,
+                    bullet: bull,
+                    contents: Vec::new(),
+                },
+            ));
+        }
+        Err(_) => {
+            let (remaining, _ws) = space1(remaining)?;
+            let (remaining, (contents, _exit_contents)) =
+                many_till(element_matcher, exit_matcher)(remaining)?;
+            let source = get_consumed(input, remaining);
+            return Ok((
+                remaining,
+                PlainListItem {
+                    source,
+                    indentation: indent_level,
+                    bullet: bull,
+                    contents,
+                },
+            ));
+        }
+    };
 }
 
 #[tracing::instrument(ret, level = "debug")]
 fn bullet<'s>(i: &'s str) -> Res<&'s str, &'s str> {
+    // TODO: If asterisk, it cannot be at start of line or it would be a headline
     alt((
         tag("*"),
         tag("-"),