From e046201a3edc22df5c00eaebc29bd978b8efde41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9o=20Gaspard?= <leo@gaspard.io>
Date: Sun, 4 Dec 2022 19:03:37 +0100
Subject: [PATCH] Expose a function to stringify a PanicInfo struct

This allows users who want to display the error message generated by console_error_panic_hook outside of the console to do it without having to reimplement javascript-based stack walking themselves.
---
 src/lib.rs | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 89945d5..e99ca12 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -94,7 +94,7 @@ cfg_if! {
             fn stack(error: &Error) -> String;
         }
 
-        fn hook_impl(info: &panic::PanicInfo) {
+        fn stringify_impl(info: &panic::PanicInfo) -> String {
             let mut msg = info.to_string();
 
             // Add the error stack to our message.
@@ -117,13 +117,21 @@ cfg_if! {
             // doing that by appending some whitespace.
             // https://github.com/rustwasm/console_error_panic_hook/issues/7
             msg.push_str("\n\n");
+            
+            msg
+        }
 
-            // Finally, log the panic with `console.error`!
-            error(msg);
+        fn hook_impl(info: &panic::PanicInfo) {
+            // Log the panic with `console.error`
+            error(stringify_impl(info));
         }
     } else {
         use std::io::{self, Write};
 
+        fn stringify_impl(info: &panic::PanicInfo) -> String {
+            format!("{}", info)
+        }
+
         fn hook_impl(info: &panic::PanicInfo) {
             let _ = writeln!(io::stderr(), "{}", info);
         }
@@ -150,3 +158,9 @@ pub fn set_once() {
         panic::set_hook(Box::new(hook));
     });
 }
+
+/// Return the string that would be displayed to the console by the `console.error` panic
+/// hook if it were set.
+pub fn stringify(info: &panic::PanicInfo) -> String {
+    stringify_impl(info)
+}