Implement support for frozen cells #101

jupytext/cell_metadata.py

@@ -249,7 +249,7 @@ def rmd_options_to_metadata(options):
     for name in metadata:
         try_eval_metadata(metadata, name)
 
-    if 'active' in metadata and 'eval' in metadata:
+    if ('active' in metadata or metadata.get('run_control', {}).get('frozen') is True) and 'eval' in metadata:
         del metadata['eval']
 
     return language, metadata
@@ -316,6 +316,8 @@ def metadata_to_json_options(metadata):
 
 def is_active(ext, metadata):
     """Is the cell active for the given file extension?"""
+    if metadata.get('run_control', {}).get('frozen') is True:
+        return False
     if 'active' not in metadata:
         return True
     return ext.replace('.', '') in re.split('\\.|,', metadata['active'])

jupytext/cell_reader.py

@@ -210,9 +210,8 @@ def find_cell_content(self, lines):
             self.metadata['lines_to_end_of_cell_marker'] = 2
 
         # Is this a raw cell?
-        if not is_active('ipynb', self.metadata) or (
-                self.ext == '.md' and self.cell_type == 'code'
-                and self.language is None):
+        if ('active' in self.metadata and not is_active('ipynb', self.metadata)) or \
+                (self.ext == '.md' and self.cell_type == 'code' and self.language is None):
             if self.metadata.get('active') == '':
                 del self.metadata['active']
             self.cell_type = 'raw'