Implement the new fields for plain link.

src/parser/plain_link.rs

@@ -54,7 +54,7 @@ pub(crate) fn plain_link<'b, 'g, 'r, 's>(
     let (remaining, _) = pre(context, input)?;
     let (remaining, path_plain) = parse_path_plain(context, remaining)?;
     peek(parser_with_context!(post)(context))(remaining)?;
-    let (remaining, _trailing_whitespace) =
+    let (remaining, post_blank) =
         maybe_consume_object_trailing_whitespace_if_not_exiting(context, remaining)?;
     let source = get_consumed(input, remaining);
     Ok((
@@ -66,6 +66,7 @@ pub(crate) fn plain_link<'b, 'g, 'r, 's>(
             raw_link: path_plain.raw_link,
             search_option: path_plain.search_option,
             application: path_plain.application,
+            post_blank: post_blank.map(Into::<&str>::into),
         },
     ))
 }

src/types/object.rs

@@ -139,6 +139,7 @@ pub struct PlainLink<'s> {
     pub raw_link: &'s str,
     pub search_option: Option<&'s str>,
     pub application: Option<&'s str>,
+    pub post_blank: Option<&'s str>,
 }
 
 #[derive(Debug)]
@@ -702,11 +703,15 @@ impl<'s> StandardProperties<'s> for PlainLink<'s> {
     }
 
     fn get_contents<'b>(&'b self) -> Option<&'s str> {
-        todo!()
+        None
     }
 
     fn get_post_blank(&self) -> PostBlank {
-        todo!()
+        self.post_blank
+            .map(|post_blank| post_blank.chars().count())
+            .unwrap_or(0)
+            .try_into()
+            .expect("Too much post-blank to fit into a PostBlank.")
     }
 }