[ADD] extensions: new autofield directive

This new directive is generating documentation from Odoo fields. This
can be used to build documentation about business classes.
This will help developpers import/export data and build localization
modules for instance.

Part-of: odoo/documentation#1334

conf.py

@@ -84,6 +84,8 @@ else:
     source_read_replace_vals['ODOO_RELPATH'] = '/../' + str(odoo_sources_dirs[0])
     source_read_replace_vals['ODOO_ABSPATH'] = str(odoo_dir)
     sys.path.insert(0, str(odoo_dir))
+    import odoo.addons
+    odoo.addons.__path__.append(str(odoo_dir) + '/addons')
     if (3, 6) < sys.version_info < (3, 7):
         # Running odoo needs python 3.7 min but monkey patch version_info to be compatible with 3.6
         sys.version_info = (3, 7, 0)
@@ -106,12 +108,17 @@ else:
         )
         odoo_dir_in_path = True
 
+# Mapping between odoo models related to master data and the declaration of the
+# data. This is used to point users to available xml_ids when giving values for
+# a field with the autodoc_field extension.
+model_references = {
+    'res.country': 'odoo/addons/base/data/res_country_data.xml',
+    'res.currency': 'odoo/addons/base/data/res_currency_data.xml',
+}
+
 # The Sphinx extensions to use, as module names.
 # They can be extensions coming with Sphinx (named 'sphinx.ext.*') or custom ones.
 extensions = [
-    # Parse Python docstrings (autodoc, automodule, autoattribute directives)
-    'sphinx.ext.autodoc' if odoo_dir_in_path else 'autodoc_placeholder',
-
     # Link sources in other projects (used to build the reference doc)
     'sphinx.ext.intersphinx',
 
@@ -141,6 +148,13 @@ if odoo_dir_in_path:
     extensions += [
         'sphinx.ext.linkcode',
         'github_link',
+        # Parse Python docstrings (autodoc, automodule, autoattribute directives)
+        'sphinx.ext.autodoc',
+        'autodoc_field',
+    ]
+else:
+    extensions += [
+        'autodoc_placeholder',
     ]
 
 todo_include_todos = False

extensions/autodoc_field/__init__.py

@@ -0,0 +1,144 @@
+import datetime
+from typing import Sequence
+
+from docutils.parsers.rst import directives
+from docutils.parsers.rst.states import RSTState
+from sphinx.domains.python import PyClasslike, PyAttribute
+from sphinx.ext.autodoc import AttributeDocumenter, ClassDocumenter
+
+import odoo
+
+
+nested_parse = RSTState.nested_parse
+def patched_nested_parse(self, block, input_offset, node, match_titles=False,
+    state_machine_class=None, state_machine_kwargs=None):
+    match_titles = True
+    return nested_parse(self, block, input_offset, node, match_titles, state_machine_class, state_machine_kwargs)
+RSTState.nested_parse = patched_nested_parse
+
+
+class OdooClassDocumenter(ClassDocumenter):
+    objtype = 'model'
+    priority = 10 + ClassDocumenter.priority
+    option_spec = {**ClassDocumenter.option_spec, 'main': directives.flag}
+
+    @classmethod
+    def can_document_member(cls, member, membername, isattr, parent):
+        return isinstance(member, odoo.models.MetaModel)
+
+    def add_content(self, more_content):
+        sourcename = self.get_sourcename()
+        cls = self.object
+        if 'main' in self.options:
+            self.add_line(f".. _model-{cls._name.replace('.', '-')}:", sourcename)
+            self.add_line('.. py:attribute:: _name', sourcename)
+            self.add_line(f'  :value: {cls._name}', sourcename)
+            self.add_line('' , sourcename)
+        super().add_content(more_content)
+
+    def add_directive_header(self, sig: str) -> None:
+        """Add the directive header and options to the generated content."""
+        sourcename = self.get_sourcename()
+        module = self.modname.split('addons.')[1].split('.')[0]
+        if 'main' in self.options:
+            title = f"Original definition from `{module}`"
+        else:
+            title = f"Additional fields with `{module}`"
+        
+        self.add_line(title, sourcename)
+        self.add_line('=' * len(title), sourcename)
+        self.add_line('', sourcename)
+        return super().add_directive_header(sig)
+
+
+class FieldDocumenter(AttributeDocumenter):
+    objtype = 'field'
+    priority = 10 + AttributeDocumenter.priority
+
+    @classmethod
+    def can_document_member(cls, member, membername, isattr, parent):
+        return isinstance(member, odoo.fields.Field)
+
+    def update_annotations(self, parent):
+        super().update_annotations(parent)
+        annotation = parent.__annotations__
+        attrname = self.object.name
+        annotation[attrname] = dict
+        field = self.object
+        if field.type == 'many2one':
+            annotation[attrname] = int
+        elif field.type in ('one2many', 'many2many'):
+            annotation[attrname] = Sequence[odoo.fields.Command]
+        elif field.type in ('selection', 'reference', 'char', 'text', 'html'):
+            annotation[attrname] = str
+        elif field.type == 'boolean':
+            annotation[attrname] = bool
+        elif field.type in ('float', 'monetary'):
+            annotation[attrname] = float
+        elif field.type == 'integer':
+            annotation[attrname] = int
+        elif field.type == 'date':
+            annotation[attrname] = datetime.date
+        elif field.type == 'datetime':
+            annotation[attrname] = datetime.datetime
+
+    def add_content(self, more_content):
+        source_name = self.get_sourcename()
+        field = self.object
+        if field.required:
+            self.add_line(f":required:", source_name)
+        self.add_line(f":name: {field.string}", source_name)
+        if field.readonly:
+            self.add_line(f":readonly: this field is not supposed to/cannot be set manually", source_name)
+        if not field.store:
+            self.add_line(f":store: this field is there only for technical reasons", source_name)
+        if field.type == 'selection':
+            if isinstance(field.selection, (list, tuple)):
+                self.add_line(f":selection:", source_name)
+                for tech, nice in field.selection:
+                    self.add_line(f"  ``{tech}``: {nice}", source_name)
+        if field.type in ('many2one', 'one2many', 'many2many'):
+            comodel_name = field.comodel_name
+            string = f":comodel: :ref:`{comodel_name} <model-{comodel_name.replace('.', '-')}>`"
+            self.add_line(string, source_name)
+            reference = self.config.model_references.get(comodel_name)
+            if reference:
+                self.add_line(f":possible_values: `{reference} <{self.config.source_read_replace_vals['GITHUB_PATH']}/{reference}>`__", source_name)
+        if field.default:
+            self.add_line(f":default: {field.default(odoo.models.Model)}", source_name)
+
+        super().add_content(more_content)
+        if field.help:
+            self.add_line('', source_name)
+            for line in field.help.strip().split('\n'):
+                self.add_line(line, source_name)
+        self.add_line('', source_name)
+
+    def get_doc(self, encoding=None, ignore=None):
+        # only read docstring of field instance, do not fallback on field class
+        field = self.object
+        field.__doc__ = field.__dict__.get('__doc__', "")
+        res = super().get_doc(encoding, ignore)
+        return res
+
+
+def disable_warn_missing_reference(app, domain, node):
+    if not ((domain and domain.name != 'std') or node['reftype'] != 'ref'):
+        target = node['reftarget']
+        if target.startswith('model-'):
+            node['reftype'] = 'odoo_missing_ref'
+            return True
+
+
+def setup(app):
+    app.add_config_value('model_references', {}, 'env')
+    directives.register_directive('py:model', PyClasslike)
+    directives.register_directive('py:field', PyAttribute)
+    app.add_autodocumenter(FieldDocumenter)
+    app.add_autodocumenter(OdooClassDocumenter)
+    app.connect('warn-missing-reference', disable_warn_missing_reference, priority=400)
+
+    return {
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

extensions/autodoc_placeholder/__init__.py

@@ -19,6 +19,8 @@ def setup(app):
     directives.register_directive('autodata', PlaceHolder)
     directives.register_directive('automethod', PlaceHolder)
     directives.register_directive('autoattribute', PlaceHolder)
+    directives.register_directive('autofield', PlaceHolder)
+    directives.register_directive('automodel', PlaceHolder)
 
     return {
         'parallel_read_safe': True,