From a29242c586a6e75438e7e6fc70f67a31ff23da88 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Mon, 4 Jul 2016 19:41:21 +0200
Subject: [PATCH] Impl Display for Ref

---
 libimagref/src/reference.rs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/libimagref/src/reference.rs b/libimagref/src/reference.rs
index 5c83e35c..465ca105 100644
--- a/libimagref/src/reference.rs
+++ b/libimagref/src/reference.rs
@@ -6,8 +6,10 @@ use std::ops::Deref;
 use std::ops::DerefMut;
 use std::collections::BTreeMap;
 use std::fs::File;
-use std::io::Read;
+use std::io::{Read, Write};
+use std::fmt::{Display, Error as FmtError, Formatter};
 use std::fs::Permissions;
+use std::result::Result as RResult;
 
 use libimagstore::store::FileLockEntry;
 use libimagstore::storeid::StoreId;
@@ -495,6 +497,20 @@ impl<'a> DerefMut for Ref<'a> {
 
 }
 
+impl<'a> Display for Ref<'a> {
+
+    fn fmt(&self, fmt: &mut Formatter) -> RResult<(), FmtError> {
+        let path = self.fs_file()
+            .map(|pb| String::from(pb.to_str().unwrap_or("<UTF8-Error>")))
+            .unwrap_or(String::from("Could not read Path from reference object"));
+
+        let hash = self.get_stored_hash().unwrap_or(String::from("<could not read hash>"));
+
+        write!(fmt, "Ref({} -> {})", hash, path)
+    }
+
+}
+
 fn hash_file_contents(f: &mut File) -> String {
     let mut hasher = Sha1::new();
     let mut s = String::new();