Panic with better message if template not found (fixes #4)

1 files changed, 8 insertions, 1 deletions

diff --git a/askama_derive/src/path.rs b/askama_derive/src/path.rs
index 96ed8c1..aac6557 100644
--- a/askama_derive/src/path.rs
+++ b/askama_derive/src/path.rs
@@ -12,7 +12,14 @@ fn template_dir() -> PathBuf {
 pub fn get_template_source(tpl_file: &str) -> String {
     let mut path = template_dir();
     path.push(Path::new(tpl_file));
-    let mut f = File::open(path).unwrap();
+    let mut f = match File::open(&path) {
+        Err(_) => {
+            let msg = format!("unable to open template file '{}'",
+                              &path.to_str().unwrap());
+            panic!(msg);
+        },
+        Ok(f) => f,
+    };
     let mut s = String::new();
     f.read_to_string(&mut s).unwrap();
     s