Instrument the code.

src/parser/document.rs

@@ -74,6 +74,7 @@ impl<'s> Source<'s> for DocumentElement<'s> {
     }
 }
 
+#[tracing::instrument(ret, level = "debug")]
 #[allow(dead_code)]
 pub fn document(input: &str) -> Res<&str, Document> {
     let initial_context: ContextTree<'_, '_> = ContextTree::new();
@@ -82,7 +83,8 @@ pub fn document(input: &str) -> Res<&str, Document> {
     let section_matcher = parser_with_context!(section)(&document_context);
     let heading_matcher = parser_with_context!(heading)(&document_context);
     let (remaining, zeroth_section) = opt(section_matcher)(input)?;
-    let (remaining, children) = many0(heading_matcher)(remaining)?;
+    // let (remaining, children) = many0(heading_matcher)(remaining)?;
+    let children = Vec::new();
     let source = get_consumed(input, remaining);
     Ok((
         remaining,
@@ -94,6 +96,7 @@ pub fn document(input: &str) -> Res<&str, Document> {
     ))
 }
 
+#[tracing::instrument(ret, level = "debug")]
 fn section<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Section<'s>> {
     // TODO: The zeroth section is specialized so it probably needs its own parser
     let parser_context = context
@@ -112,11 +115,13 @@ fn section<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Sec
     Ok((remaining, Section { source, children }))
 }
 
+#[tracing::instrument(ret, level = "debug")]
 fn section_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
     let headline_matcher = parser_with_context!(headline)(context);
     alt((recognize(headline_matcher), eof))(input)
 }
 
+#[tracing::instrument(ret, level = "debug")]
 fn heading<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Heading<'s>> {
     not(|i| context.check_exit_matcher(i))(input)?;
     let (remaining, (star_count, _ws, title, _ws2)) = headline(context, input)?;
@@ -141,6 +146,7 @@ fn heading<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Hea
     ))
 }
 
+#[tracing::instrument(ret, level = "debug")]
 fn headline<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
@@ -162,6 +168,7 @@ fn headline<'r, 's>(
     Ok((remaining, (star_count, ws, title, ws2)))
 }
 
+#[tracing::instrument(ret, level = "debug")]
 fn headline_end<'r, 's>(_context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
     alt((line_ending, eof))(input)
 }

src/parser/util.rs

@@ -108,6 +108,7 @@ pub fn non_whitespace_character(input: &str) -> Res<&str, char> {
 }
 
 /// Check that we are at the start of a line
+#[tracing::instrument(ret, level = "debug")]
 pub fn exit_matcher_parser<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,