Implement the new fields for clock.

src/parser/clock.rs

@@ -40,7 +40,7 @@ pub(crate) fn clock<'b, 'g, 'r, 's>(
     let (remaining, (timestamp, duration)) = clock_timestamp(context, remaining)?;
     let (remaining, _) = tuple((space0, org_line_ending))(remaining)?;
 
-    let (remaining, _trailing_ws) =
+    let (remaining, post_blank) =
         maybe_consume_trailing_whitespace_if_not_exiting(context, remaining)?;
     let source = get_consumed(input, remaining);
     Ok((
@@ -54,6 +54,7 @@ pub(crate) fn clock<'b, 'g, 'r, 's>(
             } else {
                 ClockStatus::Running
             },
+            post_blank: post_blank.map(Into::<&str>::into),
         },
     ))
 }

src/types/lesser_element.rs

@@ -124,6 +124,7 @@ pub struct Clock<'s> {
     pub timestamp: Timestamp<'s>,
     pub duration: Option<&'s str>,
     pub status: ClockStatus,
+    pub post_blank: Option<&'s str>,
 }
 
 #[derive(Debug)]
@@ -351,11 +352,15 @@ impl<'s> StandardProperties<'s> for Clock<'s> {
     }
 
     fn get_contents<'b>(&'b self) -> Option<&'s str> {
-        todo!()
+        None
     }
 
     fn get_post_blank(&self) -> PostBlank {
-        todo!()
+        self.post_blank
+            .map(|text| text.lines().count())
+            .unwrap_or(0)
+            .try_into()
+            .expect("Too much post-blank to fit into a PostBlank.")
     }
 }