Write-tree ignore .ugit files

how_to/Change_09.md

@@ -0,0 +1,8 @@
+- write-tree: Ignore .ugit files
+
+If we run `ugit write-tree`, we will see that it also prints the content of the
+.ugit directory. This directory isn't part of the user's files, so let's ignore
+it.
+
+Actually, I created a separate `is_ignored()` function. This way if we have any
+other files we want to ignore later we have one place to change.

ugit/base.py

@@ -7,8 +7,14 @@ def write_tree(directory="."):
     with Path.iterdir(directory) as it:
         for entry in it:
             full = f"{directory}/{entry.name}"
+            if is_ignored(full):
+                continue
             if entry.is_file(follow_symlinks=False):
                 # TODO write the file to object store
                 print(full)
             elif entry.is_dir(follow_symlinks=False):
                 write_tree(full)
+
+
+def is_ignored(path):
+    return ".ugit" in path.split("/")