1 files changed, 53 insertions, 0 deletions
diff --git a/src/panic.rs b/src/panic.rs
new file mode 100644
index 00000000..4d3524ed
--- /dev/null
+++ b/src/panic.rs
@@ -0,0 +1,53 @@
+// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//! ANSI Terminal Stream Parsing
+
+// Use the default behavior of the other platforms.
+#[cfg(not(windows))]
+pub fn attach_handler() {}
+
+// Install a panic handler that renders the panic in a classical Windows error
+// dialog box as well as writes the panic to STDERR.
+#[cfg(windows)]
+pub fn attach_handler() {
+    use std::{io, io::Write, panic, ptr};
+    use winapi::um::winuser;
+
+    panic::set_hook(Box::new(|panic_info| {
+        let _ = writeln!(io::stderr(), "{}", panic_info);
+        let msg = format!("{}\n\nPress Ctrl-C to Copy", panic_info);
+        unsafe {
+            winuser::MessageBoxW(
+                ptr::null_mut(),
+                win32_string(&msg).as_ptr(),
+                win32_string("Alacritty: Runtime Error").as_ptr(),
+                winuser::MB_ICONERROR
+                    | winuser::MB_OK
+                    | winuser::MB_SETFOREGROUND
+                    | winuser::MB_TASKMODAL,
+            );
+        }
+    }));
+}
+
+// Converts the string slice into a Windows-standard representation for "W"-
+// suffixed function variants, which accept UTF-16 encoded string values.
+#[cfg(windows)]
+fn win32_string(value: &str) -> Vec<u16> {
+    use std::ffi::OsStr;
+    use std::iter::once;
+    use std::os::windows::ffi::OsStrExt;
+    OsStr::new(value).encode_wide().chain(once(0)).collect()
+}