1 files changed, 117 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber/src/field/display.rs b/vendor/tracing-subscriber/src/field/display.rs
new file mode 100644
index 000000000..78a039ce1
--- /dev/null
+++ b/vendor/tracing-subscriber/src/field/display.rs
@@ -0,0 +1,117 @@
+//! `MakeVisitor` wrappers for working with `fmt::Display` fields.
+use super::{MakeVisitor, VisitFmt, VisitOutput};
+use tracing_core::field::{Field, Visit};
+
+use core::fmt;
+
+/// A visitor wrapper that ensures any strings named "message" are formatted
+/// using `fmt::Display`
+#[derive(Debug, Clone)]
+pub struct Messages<V>(V);
+
+// TODO(eliza): When `error` as a primitive type is stable, add a
+// `DisplayErrors` wrapper...
+
+// === impl Messages ===
+//
+impl<V> Messages<V> {
+    /// Returns a new [`MakeVisitor`] implementation that will wrap `inner` so
+    /// that any strings named `message` are formatted using `fmt::Display`.
+    ///
+    /// [`MakeVisitor`]: super::MakeVisitor
+    pub fn new(inner: V) -> Self {
+        Messages(inner)
+    }
+}
+
+impl<T, V> MakeVisitor<T> for Messages<V>
+where
+    V: MakeVisitor<T>,
+{
+    type Visitor = Messages<V::Visitor>;
+
+    #[inline]
+    fn make_visitor(&self, target: T) -> Self::Visitor {
+        Messages(self.0.make_visitor(target))
+    }
+}
+
+impl<V> Visit for Messages<V>
+where
+    V: Visit,
+{
+    #[inline]
+    fn record_f64(&mut self, field: &Field, value: f64) {
+        self.0.record_f64(field, value)
+    }
+
+    #[inline]
+    fn record_i64(&mut self, field: &Field, value: i64) {
+        self.0.record_i64(field, value)
+    }
+
+    #[inline]
+    fn record_u64(&mut self, field: &Field, value: u64) {
+        self.0.record_u64(field, value)
+    }
+
+    #[inline]
+    fn record_bool(&mut self, field: &Field, value: bool) {
+        self.0.record_bool(field, value)
+    }
+
+    /// Visit a string value.
+    fn record_str(&mut self, field: &Field, value: &str) {
+        if field.name() == "message" {
+            self.0.record_debug(field, &format_args!("{}", value))
+        } else {
+            self.0.record_str(field, value)
+        }
+    }
+
+    // TODO(eliza): add RecordError when stable
+    // fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
+    //     self.record_debug(field, &format_args!("{}", value))
+    // }
+
+    #[inline]
+    fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
+        self.0.record_debug(field, value)
+    }
+}
+
+impl<V, O> VisitOutput<O> for Messages<V>
+where
+    V: VisitOutput<O>,
+{
+    #[inline]
+    fn finish(self) -> O {
+        self.0.finish()
+    }
+}
+
+feature! {
+    #![feature = "std"]
+    use super::VisitWrite;
+    use std::io;
+
+    impl<V> VisitWrite for Messages<V>
+    where
+        V: VisitWrite,
+    {
+        #[inline]
+        fn writer(&mut self) -> &mut dyn io::Write {
+            self.0.writer()
+        }
+    }
+}
+
+impl<V> VisitFmt for Messages<V>
+where
+    V: VisitFmt,
+{
+    #[inline]
+    fn writer(&mut self) -> &mut dyn fmt::Write {
+        self.0.writer()
+    }
+}