tracing: Add a bunch of TRACE level tracing

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 20 insertions, 5 deletions

diff --git a/src/metadata.rs b/src/metadata.rs
index c598bb0..be15380 100644
--- a/src/metadata.rs
+++ b/src/metadata.rs
@@ -1,11 +1,14 @@
 use crate::{resource, Result};
 use crate::{Bindings, TemplateSpec};
 
+use std::fmt::Debug;
 use std::ops::Deref;
 use std::path::{Path, PathBuf};
 
 use pandoc_ast::{Inline, Map, MetaValue, Pandoc};
 
+use tracing::{event, instrument, Level};
+
 /// Metadata of a document, as needed by Subplot.
 #[derive(Debug)]
 pub struct Metadata {
@@ -23,26 +26,38 @@ pub struct Metadata {
 
 impl Metadata {
     /// Construct a Metadata from a Document, if possible.
+    #[instrument(level = "trace", skip(doc))]
     pub fn new<P>(basedir: P, doc: &Pandoc) -> Result<Metadata>
     where
-        P: AsRef<Path>,
+        P: AsRef<Path> + Debug,
     {
         let title = get_title(&doc.meta);
         let date = get_date(&doc.meta);
         let bindings_filenames = get_bindings_filenames(basedir.as_ref(), &doc.meta);
         let functions_filenames = get_functions_filenames(basedir.as_ref(), &doc.meta);
+        let bibliographies = get_bibliographies(basedir.as_ref(), &doc.meta);
+        let classes = get_classes(&doc.meta);
+        event!(
+            Level::TRACE,
+            ?title,
+            ?date,
+            ?bindings_filenames,
+            ?functions_filenames,
+            ?bibliographies,
+            ?classes,
+            "Loaded basic metadata"
+        );
         let (template, spec) = if let Some((template, spec)) = get_template_spec(&doc.meta)? {
             resource::set_template(&template);
             (Some(template), Some(spec))
         } else {
             (None, None)
         };
+        event!(Level::TRACE, ?template, ?spec, "Loaded template spec");
         let mut bindings = Bindings::new();
 
-        let bibliographies = get_bibliographies(basedir.as_ref(), &doc.meta);
-        let classes = get_classes(&doc.meta);
-
         get_bindings(&bindings_filenames, &mut bindings)?;
+        event!(Level::TRACE, "Loaded all metadata successfully");
         Ok(Metadata {
             title,
             date,
@@ -281,7 +296,7 @@ mod test_join {
 
 fn get_bindings<P>(filenames: &[P], bindings: &mut Bindings) -> Result<()>
 where
-    P: AsRef<Path>,
+    P: AsRef<Path> + Debug,
 {
     for filename in filenames {
         bindings.add_from_file(filename)?;