Update get_consumed to use the new wrapped input type.

src/parser/org_source.rs

@@ -50,6 +50,12 @@ impl<'s> OrgSource<'s> {
     pub fn is_at_start_of_line(&self) -> bool {
         self.start == self.start_of_line
     }
+
+    pub fn get_until(&self, other: OrgSource<'s>) -> OrgSource<'s> {
+        assert!(other.start >= self.start);
+        assert!(other.end <= self.end);
+        self.slice(..(other.start - self.start))
+    }
 }
 
 impl<'s> InputTake for OrgSource<'s> {
@@ -118,7 +124,6 @@ where
             .map(|idx| self.start + idx + 1)
             .unwrap_or(self.start_of_line);
 
-        // TODO: calculate updated values for WrappedInput
         OrgSource {
             full_source: self.full_source,
             start: new_start,