Factor FileRoute into separate module

server/src/file_route.rs

@@ -0,0 +1,37 @@
+use std::path::{Path, PathBuf};
+
+// TODO: Add lifetime, switch to using Cow<'a, str> instead of String? It's
+// possible that it would be too cumbersome!
+#[derive(Debug, Clone, PartialEq, Hash)]
+pub struct FileRoute {
+    pub partition: String,
+    pub route: Vec<String>,
+}
+
+impl FileRoute {
+    /// Creates a PathBuf out of the `FileRoute` based on the given partition
+    /// `Path`.
+    // TODO: Tests
+    pub fn to_path_buf(&self, partition_path: &Path) -> PathBuf {
+        let mut result = partition_path.to_path_buf();
+
+        for route_piece in &self.route {
+            result.push(route_piece);
+        }
+
+        result
+    }
+
+    /// Creates a version of the FileRoute with the given extra pieces appended
+    /// to the end.
+    // TODO: Test
+    pub fn extended_with(&self, pieces: &[&str]) -> FileRoute {
+        let mut result = self.clone();
+
+        for piece in pieces {
+            result.route.push(piece.to_string());
+        }
+
+        result
+    }
+}