fix simple_type_name when handling lists or types with generics

src/attachment.rs

@@ -19,6 +19,12 @@ impl<A> Debug for A where A: fmt::Debug + Send + Sync + 'static {}
 #[derive(Debug)]
 pub struct Dbg<A: Debug>(pub A);
 
+impl Dbg<String> {
+    pub fn format(attachment: impl fmt::Debug) -> Self {
+        Self(format!("{attachment:?}"))
+    }
+}
+
 impl<A: Debug> fmt::Display for Dbg<A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{:?}", self.0)
@@ -237,8 +243,12 @@ pub fn hms_string(duration: Duration) -> String {
     hms
 }
 
-pub(crate) fn simple_type_name<T: ?Sized>() -> &'static str {
+pub fn simple_type_name<T: ?Sized>() -> &'static str {
     let full_type = std::any::type_name::<T>();
+    // Option<T>, [T], Vec<T>
+    if full_type.contains(['<', '[']) {
+        return full_type;
+    }
     full_type.rsplit_once("::").map_or(full_type, |t| t.1)
 }
 

src/context.rs

@@ -3,8 +3,8 @@ use std::{path::Path, time::Duration};
 use error_stack::Context;
 
 use crate::{
-    attachment::{self, simple_type_name, FromTo, Unsupported},
-    ty, AttachExt, Report, Reportable,
+    attachment::{self, simple_type_name, Display, FromTo, Unsupported},
+    ty, AttachExt, Index, Report, Reportable,
 };
 
 use crate::{attachment::DisplayDuration, reportable, Field};
@@ -189,6 +189,10 @@ impl NotFound {
     pub fn with_field(field: &'static str) -> Report<Self> {
         Report::new(Self).attach_printable(Field::new(field, attachment::Missing))
     }
+
+    pub fn with_index<T, K: Display>(key: K) -> Report<Self> {
+        Self::with_kv(Index(key), ty!(T))
+    }
 }
 
 impl ParseError {