examples: return current span in SloggishCollector

examples/examples/sloggish/sloggish_collector.rs

@@ -1,7 +1,7 @@
 use ansi_term::{Color, Style};
 use tracing::{
     field::{Field, Visit},
-    Collect, Id, Level,
+    Collect, Id, Level, Metadata,
 };
 use tracing_core::span::Current;
 
@@ -66,6 +66,7 @@ pub struct SloggishCollector {
 struct Span {
     parent: Option<Id>,
     kvs: Vec<(&'static str, String)>,
+    metadata: &'static Metadata<'static>,
 }
 
 struct Event<'a> {
@@ -93,6 +94,7 @@ impl Span {
         let mut span = Self {
             parent,
             kvs: Vec::new(),
+            metadata: attrs.metadata(),
         };
         attrs.record(&mut span);
         span
@@ -268,6 +270,16 @@ impl Collect for SloggishCollector {
     }
 
     fn current_span(&self) -> Current {
-        Current::unknown()
+        if let Some(id) = self.current.id() {
+            let metadata = self
+                .spans
+                .lock()
+                .unwrap()
+                .get(&id)
+                .unwrap_or_else(|| panic!("no metadata stored for span with ID {:?}", id))
+                .metadata;
+            return Current::new(id, metadata);
+        }
+        return Current::none();
     }
 }