1 files changed, 41 insertions, 6 deletions
diff --git a/src/project.rs b/src/project.rs
index 1188c88..b13d4a7 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -1,12 +1,47 @@
-use std::{path::PathBuf, time::Duration};
+use std::{
+    path::PathBuf,
+    time::{Duration, SystemTime},
+};
 
-pub use git::GitProject;
-pub use path::PathProject;
+pub use self::error::Error;
+pub use self::git::GitProject;
+pub use self::path::PathProject;
 
+mod error;
 mod git;
 mod path;
 
-pub trait Project {
-    fn timestamp(&self) -> Option<Duration>;
-    fn to_path_buf(&self) -> PathBuf;
+pub trait Timestamp {
+    type Error;
+
+    fn timestamp(&self) -> Result<Duration, Self::Error>;
+}
+
+impl<T> Timestamp for T
+where
+    T: AsRef<PathBuf>,
+{
+    type Error = Error;
+
+    fn timestamp(&self) -> Result<Duration, Self::Error> {
+        self.as_ref()
+            .metadata()?
+            .modified()?
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .map_err(Into::into)
+    }
+}
+
+pub trait Project: Timestamp {
+    fn to_path_buf(&self) -> &PathBuf;
+}
+
+impl<T> Project for T
+where
+    T: Timestamp,
+    T: AsRef<PathBuf>,
+{
+    fn to_path_buf(&self) -> &PathBuf {
+        self.as_ref()
+    }
 }