retrieve files from cascading subdirs

src/dir/album.py

@@ -7,6 +7,11 @@ class Album(Directory):
     def __init__(self, path: Path, log: Log):
         super().__init__(path, log, 'ALB')
 
+    @property
+    def all_files(self) -> list:
+        # todo: handle unexpected dirs
+        return [file.path for file in self.contents]
+
     def populate(self, log: Log) -> list:
         contents = list()
         for e in self.path.iterdir():

src/dir/directory.py

@@ -30,6 +30,14 @@ class Directory(ABC):
     def __str__(self):
         return self.name
 
+    @property
+    def all_files(self) -> list:
+        files = list()
+        for c in self:
+            # todo: handle unexpected files
+            files += c.all_files()
+        return files
+
     @property
     def name(self):
         return self.path.name