1 files changed, 45 insertions, 0 deletions
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..ed6b6cc
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,45 @@
+use std::path::PathBuf;
+use std::{error, fmt, io};
+
+#[derive(Debug)]
+struct PathError {
+    path: PathBuf,
+    err: io::Error,
+}
+
+impl fmt::Display for PathError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{} at path {:?}", self.err, self.path)
+    }
+}
+
+impl error::Error for PathError {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        self.err.source()
+    }
+}
+
+pub(crate) trait IoResultExt<T> {
+    fn with_err_path<F, P>(self, path: F) -> Self
+    where
+        F: FnOnce() -> P,
+        P: Into<PathBuf>;
+}
+
+impl<T> IoResultExt<T> for Result<T, io::Error> {
+    fn with_err_path<F, P>(self, path: F) -> Self
+    where
+        F: FnOnce() -> P,
+        P: Into<PathBuf>,
+    {
+        self.map_err(|e| {
+            io::Error::new(
+                e.kind(),
+                PathError {
+                    path: path().into(),
+                    err: e,
+                },
+            )
+        })
+    }
+}