Add detect element functions for all elements that can be reasonably detected more efficiently than just parsing normally.

src/parser/comment.rs

@@ -67,6 +67,17 @@ fn comment_line<'b, 'g, 'r, 's>(
     Ok((remaining, source))
 }
 
+#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
+pub fn detect_comment<'s>(input: OrgSource<'s>) -> Res<OrgSource<'s>, ()> {
+    tuple((
+        start_of_line,
+        space0,
+        tag("#"),
+        alt((tag(" "), line_ending, eof)),
+    ))(input)?;
+    Ok((input, ()))
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;