feat: add ignored_paths option

src/jupytext/config.py

@@ -173,6 +173,12 @@ class JupytextConfiguration(Configurable):
         config=True,
     )
 
+    ignored_paths = Union(
+        [List(Unicode()), Unicode()],
+        help="A list of paths that should be ignored when saving notebooks",
+        config=True,
+    )
+
     def set_default_format_options(self, format_options, read=False):
         """Set default format option"""
         if self.default_notebook_metadata_filter:
@@ -402,6 +408,8 @@ def load_jupytext_configuration_file(config_file, stream=None):
     config.formats = short_form_multiple_formats(config.formats)
     if isinstance(config.notebook_extensions, str):
         config.notebook_extensions = config.notebook_extensions.split(",")
+    if isinstance(config.ignored_paths, str):
+        config.ignored_paths = config.ignored_paths.split(",")
     return config
 
 

src/jupytext/contentsmanager.py

@@ -119,6 +119,16 @@ def save(self, model, path=""):
             nbk = model["content"]
             try:
                 config = self.get_config(path)
+
+                if any(path.startswith(ignored_path) for ignored_path in config.ignored_paths):
+                    # Remove Jupytext metadata (if any)
+                    try:
+                        del model["content"]["metadata"]["jupytext"]
+                    except KeyError:
+                        pass
+
+                    return self.super.save(model, path)
+
                 jupytext_formats = notebook_formats(nbk, config, path)
                 self.update_paired_notebooks(path, jupytext_formats)