Unified file loading errors

1 files changed, 12 insertions, 0 deletions

diff --git a/src/diag.rs b/src/diag.rs
index 76cad792..c4438307 100644
--- a/src/diag.rs
+++ b/src/diag.rs
@@ -1,6 +1,8 @@
 //! Diagnostics.
 
 use std::fmt::{self, Display, Formatter};
+use std::io;
+use std::path::Path;
 
 use crate::syntax::{Span, Spanned};
 use crate::Context;
@@ -134,3 +136,13 @@ pub fn with_alternative(msg: String, alt: &str) -> String {
         msg
     }
 }
+
+/// Format a file loading failure.
+pub fn failed_to_load(target: &str, path: &Path, error: io::Error) -> String {
+    match error.kind() {
+        io::ErrorKind::NotFound => {
+            format!("file not found (searched at {})", path.display())
+        }
+        _ => format!("failed to load {target} ({error})"),
+    }
+}