import importlib.util
import sys
import warnings
from functools import partial
from pathlib import Path
from types import FunctionType
from typing import (
Any,
Callable,
Dict,
Iterable,
Iterator,
List,
Optional,
Tuple,
Union,
)
from warnings import warn
from napari_plugin_engine import HookImplementation
from napari_plugin_engine import PluginManager as PluginManager
from napari_plugin_engine.hooks import HookCaller
from pydantic import ValidationError
from typing_extensions import TypedDict
from ..settings import get_settings
from ..types import AugmentedWidget, LayerData, SampleDict, WidgetCallable
from ..utils._appdirs import user_site_packages
from ..utils.events import EmitterGroup, EventedSet
from ..utils.misc import camel_to_spaces, running_as_bundled_app
from ..utils.theme import Theme, register_theme, unregister_theme
from ..utils.translations import trans
from . import _builtins, hook_specifications
class PluginHookOption(TypedDict):
"""Custom type specifying plugin and enabled state."""
plugin: str
enabled: bool
CallOrderDict = Dict[str, List[PluginHookOption]]
[docs]class NapariPluginManager(PluginManager):
"""PluginManager subclass for napari-specific functionality.
Notes
-----
The events emitted by the plugin include:
* registered (value: str)
Emitted after plugin named `value` has been registered.
* unregistered (value: str)
Emitted after plugin named `value` has been unregistered.
* enabled (value: str)
Emitted after plugin named `value` has been removed from the block list.
* disabled (value: str)
Emitted after plugin named `value` has been added to the block list.
"""
ENTRY_POINT = 'napari.plugin'
def __init__(self):
super().__init__('napari', discover_entry_point=self.ENTRY_POINT)
self.events = EmitterGroup(
source=self,
registered=None,
unregistered=None,
enabled=None,
disabled=None,
)
self._blocked: EventedSet[str] = EventedSet()
self._blocked.events.changed.connect(self._on_blocked_change)
with self.discovery_blocked():
self.add_hookspecs(hook_specifications)
# dicts to store maps from extension -> plugin_name
self._extension2reader: Dict[str, str] = {}
self._extension2writer: Dict[str, str] = {}
self._sample_data: Dict[str, Dict[str, SampleDict]] = {}
self._dock_widgets: Dict[
str, Dict[str, Tuple[WidgetCallable, Dict[str, Any]]]
] = {}
self._function_widgets: Dict[str, Dict[str, Callable[..., Any]]] = {}
self._theme_data: Dict[str, Dict[str, Theme]] = dict()
if sys.platform.startswith('linux') and running_as_bundled_app():
sys.path.append(user_site_packages())
def _initialize(self):
with self.discovery_blocked():
self.register(_builtins, name='builtins')
if importlib.util.find_spec("skimage") is not None:
from . import _skimage_data
self.register(_skimage_data, name='scikit-image')
from ..settings import get_settings
# dicts to store maps from extension -> plugin_name
plugin_settings = get_settings().plugins
self._extension2reader.update(plugin_settings.extension2reader)
self._extension2writer.update(plugin_settings.extension2writer)
[docs] def register(
self, namespace: Any, name: Optional[str] = None
) -> Optional[str]:
name = super().register(namespace, name=name)
if name:
self.events.registered(value=name)
return name
[docs] def unregister(
self,
name_or_object: Any,
) -> Optional[Any]:
if isinstance(name_or_object, str):
_name = name_or_object
else:
_name = self.get_name(name_or_object)
plugin = super().unregister(name_or_object)
# unregister any theme that was associated with the
# unregistered plugin
self.unregister_theme_colors(_name)
# remove widgets, sample data, theme data
for _dict in (
self._dock_widgets,
self._sample_data,
self._theme_data,
self._function_widgets,
):
_dict.pop(_name, None) # type: ignore
self.events.unregistered(value=_name)
return plugin
def _on_blocked_change(self, event):
# things that are "added to the blocked list" become disabled
for item in event.added:
self.events.disabled(value=item)
# things that are "removed from the blocked list" become enabled
for item in event.removed:
self.events.enabled(value=item)
if event.removed:
# if an event was removed from the "disabled" list...
# let's reregister. # TODO: might be able to be more direct here.
self.discover()
get_settings().plugins.disabled_plugins = set(self._blocked)
[docs] def call_order(self, first_result_only=True) -> CallOrderDict:
"""Returns the call order from the plugin manager.
Returns
-------
call_order : CallOrderDict
mapping of hook_specification name, to a list of dicts with keys:
{'plugin', 'hook_impl', 'enabled'}. Plugins earlier in the dict are called
sooner.
"""
order: CallOrderDict = {}
for spec_name, caller in self.hooks.items():
# no need to save call order unless we only use first result
if first_result_only and not caller.is_firstresult:
continue
impls = caller.get_hookimpls()
# no need to save call order if there is only a single item
if len(impls) > 1:
order[spec_name] = [
{
'plugin': f'{impl.plugin_name}--{impl.function.__name__}',
'enabled': impl.enabled,
}
for impl in reversed(impls)
]
return order
[docs] def set_call_order(self, new_order: CallOrderDict):
"""Sets the plugin manager call order to match settings plugin values.
Note: Run this after load_settings_plugin_defaults, which
sets the default values in settings.
Parameters
----------
new_order : CallOrderDict
mapping of hook_specification name, to a list of dicts with keys:
{'plugin', 'enabled'}. Plugins earlier in the dict are called
sooner.
"""
for spec_name, hook_caller in self.hooks.items():
if spec_name in new_order:
order = []
for p in new_order.get(spec_name, []):
try:
plugin = p['plugin']
hook_impl_name = None
if '--' in plugin:
plugin, hook_impl_name = tuple(plugin.split('--'))
enabled = p['enabled']
# the plugin may not be there if its been disabled.
hook_caller._set_plugin_enabled(plugin, enabled)
hook_impls = hook_caller.get_hookimpls()
# get the HookImplementation objects matching this entry
hook_impl = list(
filter(
# plugin name has to match
lambda impl: impl.plugin_name == plugin
and (
# if we have a hook_impl_name it must match
not hook_impl_name
or impl.function.__name__ == hook_impl_name
),
hook_impls,
)
)
order.extend(hook_impl)
except KeyError:
continue
if order:
hook_caller.bring_to_front(order)
# SAMPLE DATA ---------------------------
[docs] def register_sample_data(
self,
data: Dict[str, Union[str, Callable[..., Iterable[LayerData]]]],
hookimpl: HookImplementation,
):
"""Register sample data dict returned by `napari_provide_sample_data`.
Each key in `data` is a `sample_name` (the string that will appear in the
`Open Sample` menu), and the value is either a string, or a callable that
returns an iterable of ``LayerData`` tuples, where each tuple is a 1-, 2-,
or 3-tuple of ``(data,)``, ``(data, meta)``, or ``(data, meta,
layer_type)``.
Parameters
----------
data : Dict[str, Union[str, Callable[..., Iterable[LayerData]]]]
A mapping of {sample_name->data}
hookimpl : HookImplementation
The hook implementation that returned the dict
"""
plugin_name = hookimpl.plugin_name
hook_name = 'napari_provide_sample_data'
if not isinstance(data, dict):
warn_message = trans._(
'Plugin {plugin_name!r} provided a non-dict object to {hook_name!r}: data ignored.',
deferred=True,
plugin_name=plugin_name,
hook_name=hook_name,
)
warn(message=warn_message)
return
_data: Dict[str, SampleDict] = {}
for name, _datum in list(data.items()):
if isinstance(_datum, dict):
datum: SampleDict = _datum
if 'data' not in _datum or 'display_name' not in _datum:
warn_message = trans._(
'In {hook_name!r}, plugin {plugin_name!r} provided an invalid dict object for key {name!r} that does not have required keys: "data" and "display_name". Ignoring',
deferred=True,
hook_name=hook_name,
plugin_name=plugin_name,
name=name,
)
warn(message=warn_message)
continue
else:
datum = {'data': _datum, 'display_name': name}
if not (
callable(datum['data'])
or isinstance(datum['data'], (str, Path))
):
warn_message = trans._(
'Plugin {plugin_name!r} provided invalid data for key {name!r} in the dict returned by {hook_name!r}. (Must be str, callable, or dict), got ({dtype}).',
deferred=True,
plugin_name=plugin_name,
name=name,
hook_name=hook_name,
dtype=type(datum["data"]),
)
warn(message=warn_message)
continue
_data[name] = datum
if plugin_name not in self._sample_data:
self._sample_data[plugin_name] = {}
self._sample_data[plugin_name].update(_data)
[docs] def available_samples(self) -> Tuple[Tuple[str, str], ...]:
"""Return a tuple of sample data keys provided by plugins.
Returns
-------
sample_keys : Tuple[Tuple[str, str], ...]
A sequence of 2-tuples ``(plugin_name, sample_name)`` showing available
sample data provided by plugins. To load sample data into the viewer,
use :meth:`napari.Viewer.open_sample`.
Examples
--------
.. code-block:: python
from napari.plugins import available_samples
sample_keys = available_samples()
if sample_keys:
# load first available sample
viewer.open_sample(*sample_keys[0])
"""
return tuple(
(p, s) for p in self._sample_data for s in self._sample_data[p]
)
# THEME DATA ------------------------------------
[docs] def register_theme_colors(
self,
data: Dict[str, Dict[str, Union[str, Tuple, List]]],
hookimpl: HookImplementation,
):
"""Register theme data dict returned by `napari_experimental_provide_theme`.
The `theme` data should be provided as an iterable containing dictionary
of values, where the ``folder`` value will be used as theme name.
"""
plugin_name = hookimpl.plugin_name
hook_name = '`napari_experimental_provide_theme`'
if not isinstance(data, Dict):
warn_message = trans._(
'Plugin {plugin_name!r} provided a non-dict object to {hook_name!r}: data ignored',
deferred=True,
plugin_name=plugin_name,
hook_name=hook_name,
)
warn(message=warn_message)
return
_data = {}
for theme_name, theme_colors in data.items():
try:
theme = Theme.parse_obj(theme_colors)
register_theme(theme_name, theme)
_data[theme_name] = theme
except (KeyError, ValidationError) as err:
warn_msg = trans._(
"In {hook_name!r}, plugin {plugin_name!r} provided an invalid dict object for creating themes. {err!r}",
deferred=True,
hook_name=hook_name,
plugin_name=plugin_name,
err=err,
)
warn(message=warn_msg)
continue
if plugin_name not in self._theme_data:
self._theme_data[plugin_name] = {}
self._theme_data[plugin_name].update(_data)
[docs] def unregister_theme_colors(self, plugin_name: str):
"""Unregister theme data from napari."""
if plugin_name not in self._theme_data:
return
# unregister all themes that were provided by the plugins
for theme_name in self._theme_data[plugin_name]:
unregister_theme(theme_name)
# since its possible that disabled/removed plugin was providing the
# current theme, we check for this explicitly and if this the case,
# theme is automatically changed to default `dark` theme
settings = get_settings()
current_theme = settings.appearance.theme
if current_theme in self._theme_data[plugin_name]:
settings.appearance.theme = "dark" # type: ignore
warnings.warn(
message=trans._(
"The current theme {current_theme!r} was provided by the plugin {plugin_name!r} which was disabled or removed. Switched theme to the default.",
deferred=True,
plugin_name=plugin_name,
current_theme=current_theme,
)
)
[docs] def discover_themes(self):
"""Trigger discovery of theme plugins.
As a "historic" hook, this should only need to be called once.
(historic here means that even plugins that are discovered after this
is called will be added.)
"""
if self._theme_data:
return
self.hook.napari_experimental_provide_theme.call_historic(
result_callback=partial(self.register_theme_colors), with_impl=True
)
# FUNCTION & DOCK WIDGETS -----------------------
def iter_widgets(self) -> Iterator[Tuple[str, Tuple[str, Dict[str, Any]]]]:
from itertools import chain, repeat
dock_widgets = zip(repeat("dock"), self._dock_widgets.items())
func_widgets = zip(repeat("func"), self._function_widgets.items())
yield from chain(dock_widgets, func_widgets) # type: ignore [misc]
def register_dock_widget(
self,
args: Union[AugmentedWidget, List[AugmentedWidget]],
hookimpl: HookImplementation,
):
plugin_name = hookimpl.plugin_name
hook_name = '`napari_experimental_provide_dock_widget`'
for arg in args if isinstance(args, list) else [args]:
if isinstance(arg, tuple):
if not arg:
warn_message = trans._(
'Plugin {plugin_name!r} provided an invalid tuple to {hook_name}. Skipping',
deferred=True,
plugin_name=plugin_name,
hook_name=hook_name,
)
warn(message=warn_message)
continue
_cls = arg[0]
kwargs = arg[1] if len(arg) > 1 else {}
else:
_cls, kwargs = (arg, {})
if not callable(_cls):
warn_message = trans._(
'Plugin {plugin_name!r} provided a non-callable object (widget) to {hook_name}: {_cls!r}. Widget ignored.',
deferred=True,
plugin_name=plugin_name,
hook_name=hook_name,
_cls=_cls,
)
warn(message=warn_message)
continue
if not isinstance(kwargs, dict):
warn_message = trans._(
'Plugin {plugin_name!r} provided invalid kwargs to {hook_name} for class {clsname}. Widget ignored.',
deferred=True,
plugin_name=plugin_name,
hook_name=hook_name,
clsname=_cls.__name__,
)
warn(message=warn_message)
continue
# Get widget name
name = str(kwargs.get('name', '')) or camel_to_spaces(
_cls.__name__
)
if plugin_name not in self._dock_widgets:
# tried defaultdict(dict) but got odd KeyErrors...
self._dock_widgets[plugin_name] = {}
elif name in self._dock_widgets[plugin_name]:
warn_message = trans._(
'Plugin {plugin_name!r} has already registered a dock widget {name!r} which has now been overwritten',
deferred=True,
plugin_name=plugin_name,
name=name,
)
warn(message=warn_message)
self._dock_widgets[plugin_name][name] = (_cls, kwargs)
def register_function_widget(
self,
args: Union[Callable, List[Callable]],
hookimpl: HookImplementation,
):
plugin_name = hookimpl.plugin_name
hook_name = '`napari_experimental_provide_function`'
for func in args if isinstance(args, list) else [args]:
if not isinstance(func, FunctionType):
warn_message = trans._(
'Plugin {plugin_name!r} provided a non-callable type to {hook_name}: {functype!r}. Function widget ignored.',
deferred=True,
functype=type(func),
plugin_name=plugin_name,
hook_name=hook_name,
)
if isinstance(func, tuple):
warn_message += trans._(
" To provide multiple function widgets please use a LIST of callables",
deferred=True,
)
warn(message=warn_message)
continue
# Get function name
name = func.__name__.replace('_', ' ')
if plugin_name not in self._function_widgets:
# tried defaultdict(dict) but got odd KeyErrors...
self._function_widgets[plugin_name] = {}
elif name in self._function_widgets[plugin_name]:
warn_message = trans._(
'Plugin {plugin_name!r} has already registered a function widget {name!r} which has now been overwritten',
deferred=True,
plugin_name=plugin_name,
name=name,
)
warn(message=warn_message)
self._function_widgets[plugin_name][name] = func
def discover_sample_data(self):
if self._sample_data:
return
self.hook.napari_provide_sample_data.call_historic(
result_callback=partial(self.register_sample_data), with_impl=True
)
[docs] def get_reader_for_extension(self, extension: str) -> Optional[str]:
"""Return reader plugin assigned to `extension`, or None."""
return self._get_plugin_for_extension(extension, type_='reader')
[docs] def assign_reader_to_extensions(
self, reader: str, extensions: Union[str, Iterable[str]]
) -> None:
"""Assign a specific reader plugin to `extensions`.
Parameters
----------
reader : str
Name of a plugin offering a reader hook.
extensions : Union[str, Iterable[str]]
Name(s) of extensions to always write with `reader`
"""
from ..settings import get_settings
self._assign_plugin_to_extensions(reader, extensions, type_='reader')
extension2readers = get_settings().plugins.extension2reader
get_settings().plugins.extension2reader = {
**extension2readers,
**self._extension2reader,
}
[docs] def get_writer_for_extension(self, extension: str) -> Optional[str]:
"""Return writer plugin assigned to `extension`, or None."""
return self._get_plugin_for_extension(extension, type_='writer')
[docs] def assign_writer_to_extensions(
self, writer: str, extensions: Union[str, Iterable[str]]
) -> None:
"""Assign a specific writer plugin to `extensions`.
Parameters
----------
writer : str
Name of a plugin offering a writer hook.
extensions : Union[str, Iterable[str]]
Name(s) of extensions to always write with `writer`
"""
from ..settings import get_settings
self._assign_plugin_to_extensions(writer, extensions, type_='writer')
get_settings().plugins.extension2writer = self._extension2writer
def _get_plugin_for_extension(
self, extension: str, type_: str
) -> Optional[str]:
"""helper method for public get_<type_>_for_extension functions."""
ext_map = getattr(self, f'_extension2{type_}', None)
if ext_map is None:
raise ValueError(
trans._(
"invalid plugin type: {type_!r}",
deferred=True,
type_=type_,
)
)
if not extension.startswith("."):
extension = f".{extension}"
plugin = ext_map.get(extension)
# make sure it's still an active plugin
if plugin and (plugin not in self.plugins):
del self.ext_map[plugin]
return None
return plugin
def _assign_plugin_to_extensions(
self,
plugin: str,
extensions: Union[str, Iterable[str]],
type_: Optional[str] = None,
) -> None:
"""helper method for public assign_<type_>_to_extensions functions."""
caller: HookCaller = getattr(self.hook, f'napari_get_{type_}', None)
if caller is None:
raise ValueError(
trans._(
"invalid plugin type: {type_!r}",
deferred=True,
type_=type_,
)
)
plugins = caller.get_hookimpls()
if plugin not in {p.plugin_name for p in plugins}:
msg = trans._(
"{plugin!r} is not a valid {type_} plugin name",
plugin=plugin,
type_=type_,
deferred=True,
)
raise ValueError(msg)
ext_map = getattr(self, f'_extension2{type_}')
if isinstance(extensions, str):
extensions = [extensions]
for ext in extensions:
if not ext.startswith("."):
ext = f".{ext}"
ext_map[ext] = plugin
# give warning that plugin *may* not be able to read that extension
try:
func = caller._call_plugin(plugin, path=f'_testing_{ext}')
except Exception:
pass
if func is None:
msg = trans._(
'plugin {plugin!r} did not return a {type_} function when provided a path ending in {ext!r}. This *may* indicate a typo?',
deferred=True,
plugin=plugin,
type_=type_,
ext=ext,
)
warn(msg)