feat: make OpaqueError FanctTrace more legible

src/opaque_error.rs

@@ -61,9 +61,10 @@ impl OpaqueError {
             true
         });
         let str = vec.iter().rfold(String::new(), |mut acc, x| {
-            let first = acc.len() != 0;
-            if first {
-                acc.push_str(":");
+            let first = acc.len() == 0;
+            if !first {
+                // TODO: should this code be hardcoded?
+                acc.push_str("\x1b[2m:\x1b[0m");
             }
 
             acc.push_str(x.0);
@@ -74,6 +75,7 @@ impl OpaqueError {
             }
             acc
         });
+
         FancyTrace { str }
     }
     pub fn set_level(mut self, lvl: Level) -> Self {
@@ -92,7 +94,7 @@ pub struct FancyTrace {
 }
 impl fmt::Display for FancyTrace {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.str)
+        write!(f, "\x1b[2m{{{{\x1b[0m {} \x1b[2m}}}}\x1b[0m", self.str)
     }
 }