689 lines
26 KiB
Python
689 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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from lektor.build_programs import BuildProgram
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from lektor.builder import Artifact, Builder, PathCache # typing
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from lektor.context import get_ctx
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from lektor.db import Database, Record # typing
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from lektor.environment import Expression
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from lektor.pluginsystem import Plugin, IniFile
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from lektor.reporter import reporter, style
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from lektor.sourceobj import SourceObject, VirtualSourceObject
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from lektor.types.flow import Flow, FlowType
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from lektor.utils import bool_from_string, build_url, prune_file_and_folder
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# for quick config
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from lektor.utils import slugify
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from typing import Tuple, Dict, Set, List, Union, Any, NamedTuple
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from typing import NewType, Optional, Iterable, Callable, Iterator, Generator
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from weakref import WeakSet
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VPATH = '@groupby' # potentially unsafe. All matching entries are pruned.
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# -----------------------------------
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# Typing
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# -----------------------------------
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SelectionKey = NewType('SelectionKey', str) # attribute of lektor model
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GroupKey = NewType('GroupKey', str) # key of group-by
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class FieldKeyPath(NamedTuple):
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fieldKey: str
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flowIndex: Optional[int] = None
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flowKey: Optional[str] = None
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class GroupByCallbackArgs(NamedTuple):
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record: Record
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key: FieldKeyPath
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field: object # lektor model data-field value
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GroupByCallbackYield = Union[GroupKey, Tuple[GroupKey, object]]
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GroupingCallback = Callable[[GroupByCallbackArgs], Union[
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Iterator[GroupByCallbackYield],
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Generator[GroupByCallbackYield, Optional[str], None],
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]]
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# -----------------------------------
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# Config
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# -----------------------------------
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class GroupByConfig:
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'''
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Holds information for GroupByWatcher and GroupBySource.
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This object is accessible in your template file ({{this.config}}).
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Available attributes:
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key, root, slug, template, enabled, dependencies, fields, key_map
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'''
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def __init__(
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self,
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key: SelectionKey, *,
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root: Optional[str] = None, # default: "/"
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slug: Optional[str] = None, # default: "{attr}/{group}/index.html"
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template: Optional[str] = None, # default: "groupby-{attr}.html"
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) -> None:
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self.key = key
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self.root = (root or '/').rstrip('/') + '/'
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self.slug = slug or f'"{key}/" ~ this.key ~ "/"' # this: GroupBySource
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self.template = template or f'groupby-{self.key}.html'
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# editable after init
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self.enabled = True
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self.dependencies = set() # type: Set[str]
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self.fields = {} # type: Dict[str, str]
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self.key_map = {} # type: Dict[str, str]
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def slugify(self, k: str) -> str:
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''' key_map replace and slugify. '''
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return slugify(self.key_map.get(k, k)) # type: ignore[no-any-return]
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def set_fields(self, fields: Optional[Dict[str, str]]) -> None:
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'''
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The fields dict is a mapping of attrib = Expression values.
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Each dict key will be added to the GroupBySource virtual object.
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Each dict value is passed through jinja context first.
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'''
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self.fields = fields or {}
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def set_key_map(self, key_map: Optional[Dict[str, str]]) -> None:
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''' This mapping replaces group keys before slugify. '''
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self.key_map = key_map or {}
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def __repr__(self) -> str:
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txt = '<GroupByConfig'
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for x in ['key', 'root', 'slug', 'template', 'dependencies']:
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txt += ' {}="{}"'.format(x, getattr(self, x))
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txt += f' fields="{", ".join(self.fields)}"'
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return txt + '>'
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@staticmethod
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def from_dict(key: SelectionKey, cfg: Dict[str, str]) -> 'GroupByConfig':
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''' Set config fields manually. Only: key, root, slug, template. '''
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return GroupByConfig(
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key=key,
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root=cfg.get('root'),
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slug=cfg.get('slug'),
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template=cfg.get('template'),
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)
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@staticmethod
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def from_ini(key: SelectionKey, ini: IniFile) -> 'GroupByConfig':
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''' Read and parse ini file. Also adds dependency tracking. '''
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cfg = ini.section_as_dict(key) # type: Dict[str, str]
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conf = GroupByConfig.from_dict(key, cfg)
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conf.enabled = ini.get_bool(key + '.enabled', True)
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conf.dependencies.add(ini.filename)
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conf.set_fields(ini.section_as_dict(key + '.fields'))
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conf.set_key_map(ini.section_as_dict(key + '.key_map'))
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return conf
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# -----------------------------------
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# VirtualSource & BuildProgram
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# -----------------------------------
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class GroupBySource(VirtualSourceObject):
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'''
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Holds information for a single group/cluster.
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This object is accessible in your template file.
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Attributes: record, key, group, slug, children, config
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'''
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def __init__(
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self,
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record: Record,
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group: GroupKey,
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config: GroupByConfig,
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children: Optional[Dict[Record, List[object]]] = None,
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) -> None:
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super().__init__(record)
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self.key = config.slugify(group)
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self.group = group
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self.config = config
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# make sure children are on the same pad
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self._children = {} # type: Dict[Record, List[object]]
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for child, extras in (children or {}).items():
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if child.pad != record.pad:
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child = record.pad.get(child.path)
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self._children[child] = extras
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self._reverse_reference_records()
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# evaluate slug Expression
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self.slug = self._eval(config.slug, field='slug') # type: str
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assert self.slug != Ellipsis, 'invalid config: ' + config.slug
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if self.slug and self.slug.endswith('/index.html'):
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self.slug = self.slug[:-10]
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# extra fields
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for attr, expr in config.fields.items():
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setattr(self, attr, self._eval(expr, field='fields.' + attr))
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def _eval(self, value: str, *, field: str) -> Any:
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''' Internal only: evaluates Lektor config file field expression. '''
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pad = self.record.pad
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alt = self.record.alt
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try:
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return Expression(pad.env, value).evaluate(pad, this=self, alt=alt)
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except Exception as e:
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report_config_error(self.config.key, field, value, e)
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return Ellipsis
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# ---------------------
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# Lektor properties
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# ---------------------
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@property
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def path(self) -> str:
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# Used in VirtualSourceInfo, used to prune VirtualObjects
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return f'{self.record.path}{VPATH}/{self.config.key}/{self.key}'
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@property
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def url_path(self) -> str:
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# Actual path to resource as seen by the browser
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return build_url([self.record.path, self.slug]) # slug can be None!
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def __getitem__(self, name: str) -> object:
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# needed for preview in admin UI
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if name == '_path':
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return self.path
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elif name == '_alt':
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return self.record.alt
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return None
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def iter_source_filenames(self) -> Iterator[str]:
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''' Enumerate all dependencies '''
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if self.config.dependencies:
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yield from self.config.dependencies
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for record in self._children:
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yield from record.iter_source_filenames()
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# -----------------------
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# Properties & Helper
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# -----------------------
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@property
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def children(self):
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return self._children
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@property
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def first_child(self) -> Optional[Record]:
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''' Returns first referencing page record. '''
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if self._children:
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return iter(self._children).__next__()
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return None
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@property
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def first_extra(self) -> Optional[object]:
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''' Returns first additional / extra info object of first page. '''
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if not self._children:
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return None
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val = iter(self._children.values()).__next__()
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return val[0] if val else None
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def __lt__(self, other: 'GroupBySource') -> bool:
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''' The "group" attribute is used for sorting. '''
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return self.group < other.group
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def __repr__(self) -> str:
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return '<GroupBySource path="{}" children={}>'.format(
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self.path, len(self._children))
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# ---------------------
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# Reverse Reference
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# ---------------------
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def _reverse_reference_records(self) -> None:
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''' Attach self to page records. '''
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for child in self._children:
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if not hasattr(child, '_groupby'):
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child._groupby = WeakSet() # type: ignore[attr-defined]
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child._groupby.add(self) # type: ignore[attr-defined]
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@staticmethod
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def of_record(
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record: Record,
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*keys: str,
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recursive: bool = False
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) -> Iterator['GroupBySource']:
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''' Extract all referencing groupby virtual objects from a page. '''
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ctx = get_ctx()
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# manage dependencies
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if ctx:
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for dep in ctx.env.plugins['groupby'].config_dependencies:
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ctx.record_dependency(dep)
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# find groups
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proc_list = [record]
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while proc_list:
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page = proc_list.pop(0)
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if recursive and hasattr(page, 'children'):
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proc_list.extend(page.children) # type: ignore[attr-defined]
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if not hasattr(page, '_groupby'):
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continue
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for vobj in page._groupby: # type: ignore[attr-defined]
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if not keys or vobj.config.key in keys:
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yield vobj
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class GroupByBuildProgram(BuildProgram):
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''' Generate Build-Artifacts and write files. '''
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def produce_artifacts(self) -> None:
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url = self.source.url_path
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if url.endswith('/'):
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url += 'index.html'
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self.declare_artifact(url, sources=list(
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self.source.iter_source_filenames()))
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GroupByPruner.track(url)
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def build_artifact(self, artifact: Artifact) -> None:
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get_ctx().record_virtual_dependency(self.source)
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artifact.render_template_into(
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self.source.config.template, this=self.source)
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# -----------------------------------
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# Helper
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# -----------------------------------
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def report_config_error(key: str, field: str, val: str, e: Exception) -> None:
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''' Send error message to Lektor reporter. Indicate which field is bad. '''
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msg = '[ERROR] invalid config for [{}.{}] = "{}", Error: {}'.format(
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key, field, val, repr(e))
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try:
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reporter._write_line(style(msg, fg='red'))
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except Exception:
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print(msg)
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class GroupByPruner:
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'''
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Static collector for build-artifact urls.
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All non-tracked VPATH-urls will be pruned after build.
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'''
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_cache: Set[str] = set()
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# Note: this var is static or otherwise two instances of
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# GroupByCreator would prune each others artifacts.
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@classmethod
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def track(cls, url: str) -> None:
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''' Add url to build cache to prevent pruning. '''
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cls._cache.add(url.lstrip('/'))
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@classmethod
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def prune(cls, builder: Builder) -> None:
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''' Remove previously generated, unreferenced Artifacts. '''
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dest_path = builder.destination_path
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con = builder.connect_to_database()
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try:
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with builder.new_build_state() as build_state:
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for url, file in build_state.iter_artifacts():
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if url.lstrip('/') in cls._cache:
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continue # generated in this build-run
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infos = build_state.get_artifact_dependency_infos(url, [])
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for v_path, _ in infos:
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if VPATH not in v_path:
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continue # we only care about groupby Virtuals
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reporter.report_pruned_artifact(url)
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prune_file_and_folder(file.filename, dest_path)
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build_state.remove_artifact(url)
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break # there is only one VPATH-entry per source
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finally:
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con.close()
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cls._cache.clear()
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class GroupByModelReader:
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''' Find models and flow-models which contain attribute '''
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def __init__(self, db: Database, attrib: SelectionKey) -> None:
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self._flows = {} # type: Dict[str, Set[str]]
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self._models = {} # type: Dict[str, Dict[str, str]]
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# find flow blocks containing attribute
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for key, flow in db.flowblocks.items():
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tmp1 = set(f.name for f in flow.fields
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if bool_from_string(f.options.get(attrib, False)))
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if tmp1:
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self._flows[key] = tmp1
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# find models and flow-blocks containing attribute
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for key, model in db.datamodels.items():
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tmp2 = {} # Dict[str, str]
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for field in model.fields:
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if bool_from_string(field.options.get(attrib, False)):
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tmp2[field.name] = '*' # include all children
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elif isinstance(field.type, FlowType) and self._flows:
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# only processed if at least one flow has attrib
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fbs = field.type.flow_blocks
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# if fbs == None, all flow-blocks are allowed
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if fbs is None or any(x in self._flows for x in fbs):
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tmp2[field.name] = '?' # only some flow blocks
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if tmp2:
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self._models[key] = tmp2
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def read(
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self,
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record: Record,
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flatten: bool = False
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) -> Iterator[Tuple[FieldKeyPath, object]]:
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'''
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Enumerate all fields of a Record with attrib = True.
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Flows are either returned directly (flatten=False) or
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expanded so that each flow-block is yielded (flatten=True)
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'''
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assert isinstance(record, Record)
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for r_key, subs in self._models.get(record.datamodel.id, {}).items():
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if subs == '*': # either normal field or flow type (all blocks)
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field = record[r_key]
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if flatten and isinstance(field, Flow):
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for i, flow in enumerate(field.blocks):
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flowtype = flow['_flowblock']
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for f_key, block in flow._data.items():
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if f_key.startswith('_'): # e.g., _flowblock
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continue
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yield FieldKeyPath(r_key, i, f_key), block
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else:
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yield FieldKeyPath(r_key), field
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else: # always flow type (only some blocks)
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for i, flow in enumerate(record[r_key].blocks):
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flowtype = flow['_flowblock']
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for f_key in self._flows.get(flowtype, []):
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yield FieldKeyPath(r_key, i, f_key), flow[f_key]
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class GroupByState:
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''' Holds and updates a groupby build state. '''
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def __init__(self) -> None:
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self.state = {} # type: Dict[GroupKey, Dict[Record, List[object]]]
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self._processed = set() # type: Set[Record]
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def __contains__(self, record: Record) -> bool:
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''' Returns True if record was already processed. '''
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return record.path in self._processed
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def items(self) -> Iterable[Tuple[GroupKey, Dict]]:
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''' Iterable with (GroupKey, {record: [extras]}) tuples. '''
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return self.state.items()
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def add(self, record: Record, group: Dict[GroupKey, List[object]]) -> None:
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''' Append groups if not processed already. '''
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if record.path not in self._processed:
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self._processed.add(record.path)
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for group_key, extras in group.items():
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if group_key in self.state:
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self.state[group_key][record] = extras
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else:
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self.state[group_key] = {record: extras}
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class GroupByWatcher:
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'''
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Callback is called with (Record, FieldKeyPath, field-value).
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Callback may yield one or more (group-key, extra-info) tuples.
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'''
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def __init__(self, config: GroupByConfig) -> None:
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self.config = config
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self.flatten = True
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self.callback = None # type: GroupingCallback #type:ignore[assignment]
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def grouping(self, flatten: bool = True) \
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-> Callable[[GroupingCallback], None]:
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'''
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Decorator to subscribe to attrib-elements.
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If flatten = False, dont explode FlowType.
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(record, field-key, field) -> (group-key, extra-info)
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'''
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def _decorator(fn: GroupingCallback) -> None:
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self.flatten = flatten
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self.callback = fn
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return _decorator
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def initialize(self, db: Database) -> None:
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''' Reset internal state. You must initialize before each build! '''
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assert callable(self.callback), 'No grouping callback provided.'
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self._root = self.config.root
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self._state = GroupByState()
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self._model_reader = GroupByModelReader(db, attrib=self.config.key)
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def should_process(self, node: Record) -> bool:
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''' Check if record path is being watched. '''
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p = node['_path'] # type: str
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return p.startswith(self._root) or p + '/' == self._root
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def process(self, record: Record) -> None:
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'''
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Will iterate over all record fields and call the callback method.
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Each record is guaranteed to be processed only once.
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'''
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if record in self._state:
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return
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tmp = {} # type: Dict[GroupKey, List[object]]
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for key, field in self._model_reader.read(record, self.flatten):
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_gen = self.callback(GroupByCallbackArgs(record, key, field))
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try:
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obj = next(_gen)
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while True:
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if not isinstance(obj, (str, tuple)):
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raise TypeError(f'Unsupported groupby yield: {obj}')
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group = obj if isinstance(obj, str) else obj[0]
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if group not in tmp:
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tmp[group] = []
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if isinstance(obj, tuple):
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tmp[group].append(obj[1])
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# return slugified group key and continue iteration
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if isinstance(_gen, Generator) and not _gen.gi_yieldfrom:
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obj = _gen.send(self.config.slugify(group))
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else:
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obj = next(_gen)
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except StopIteration:
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del _gen
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self._state.add(record, tmp)
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def iter_sources(self, root: Record) -> Iterator[GroupBySource]:
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''' Prepare and yield GroupBySource elements. '''
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for group, children in self._state.items():
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yield GroupBySource(root, group, self.config, children=children)
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def __repr__(self) -> str:
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return '<GroupByWatcher key="{}" enabled={} callback={}>'.format(
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self.config.key, self.config.enabled, self.callback)
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# -----------------------------------
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# Main Component
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# -----------------------------------
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class GroupByCreator:
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'''
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Process all children with matching conditions under specified page.
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Creates a grouping of pages with similar (self-defined) attributes.
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The grouping is performed only once per build.
|
|
'''
|
|
|
|
def __init__(self) -> None:
|
|
self._watcher = [] # type: List[GroupByWatcher]
|
|
self._results = {} # type: Dict[str, GroupBySource]
|
|
self._resolver = {} # type: Dict[str, Tuple[GroupKey, GroupByConfig]]
|
|
self._weak_ref_keep_alive = [] # type: List[GroupBySource]
|
|
|
|
# ----------------
|
|
# Add Observer
|
|
# ----------------
|
|
|
|
def add_watcher(
|
|
self,
|
|
key: SelectionKey,
|
|
config: Union[GroupByConfig, IniFile, Dict]
|
|
) -> GroupByWatcher:
|
|
''' Init GroupByConfig and add to watch list. '''
|
|
assert isinstance(config, (GroupByConfig, IniFile, Dict))
|
|
if isinstance(config, GroupByConfig):
|
|
cfg = config
|
|
elif isinstance(config, IniFile):
|
|
cfg = GroupByConfig.from_ini(key, config)
|
|
elif isinstance(config, Dict):
|
|
cfg = GroupByConfig.from_dict(key, config)
|
|
|
|
w = GroupByWatcher(cfg)
|
|
self._watcher.append(w)
|
|
return w
|
|
|
|
# -----------
|
|
# Builder
|
|
# -----------
|
|
|
|
def clear_previous_results(self) -> None:
|
|
''' Reset prvious results. Must be called before each build. '''
|
|
self._watcher.clear()
|
|
self._results.clear()
|
|
self._resolver.clear()
|
|
self._weak_ref_keep_alive.clear()
|
|
|
|
def get_dependencies(self) -> Set[str]:
|
|
deps = set() # type: Set[str]
|
|
for w in self._watcher:
|
|
deps.update(w.config.dependencies)
|
|
return deps
|
|
|
|
def make_cluster(self, builder: Builder) -> None:
|
|
''' Iterate over all children and perform groupby. '''
|
|
# remove disabled watchers
|
|
self._watcher = [w for w in self._watcher if w.config.enabled]
|
|
if not self._watcher:
|
|
return
|
|
# initialize remaining (enabled) watchers
|
|
for w in self._watcher:
|
|
w.initialize(builder.pad.db)
|
|
# iterate over whole build tree
|
|
queue = builder.pad.get_all_roots() # type: List[SourceObject]
|
|
while queue:
|
|
record = queue.pop()
|
|
self.queue_now(record)
|
|
if hasattr(record, 'attachments'):
|
|
queue.extend(record.attachments) # type: ignore[attr-defined]
|
|
if hasattr(record, 'children'):
|
|
queue.extend(record.children) # type: ignore[attr-defined]
|
|
# build artifacts
|
|
for w in self._watcher:
|
|
root = builder.pad.get(w.config.root)
|
|
for vobj in w.iter_sources(root):
|
|
if vobj.slug:
|
|
url = vobj.url_path
|
|
self._results[url] = vobj
|
|
self._resolver[url] = (vobj.group, w.config)
|
|
else:
|
|
self._weak_ref_keep_alive.append(vobj) # for weak ref
|
|
self._watcher.clear()
|
|
|
|
def queue_now(self, node: SourceObject) -> None:
|
|
''' Process record immediatelly (No-Op if already processed). '''
|
|
if isinstance(node, Record):
|
|
for w in self._watcher:
|
|
if w.should_process(node):
|
|
w.process(node)
|
|
|
|
def build_all(self, builder: Builder) -> None:
|
|
''' Create virtual objects and build sources. '''
|
|
path_cache = PathCache(builder.env)
|
|
for _, vobj in sorted(self._results.items()):
|
|
builder.build(vobj, path_cache)
|
|
del path_cache
|
|
self._results.clear()
|
|
self._weak_ref_keep_alive.clear() # garbage collect weak refs
|
|
|
|
# -----------------
|
|
# Path resolver
|
|
# -----------------
|
|
|
|
def resolve_dev_server_path(
|
|
self, node: SourceObject, pieces: List[str]
|
|
) -> Optional[GroupBySource]:
|
|
''' Dev server only: Resolves path/ -> path/index.html '''
|
|
if not isinstance(node, Record):
|
|
return None
|
|
rv = self._resolver.get(build_url([node.url_path] + pieces))
|
|
if not rv:
|
|
return None
|
|
group, conf = rv
|
|
return GroupBySource(node, group, conf)
|
|
|
|
def resolve_virtual_path(
|
|
self, node: SourceObject, pieces: List[str]
|
|
) -> Optional[GroupBySource]:
|
|
if isinstance(node, Record) and len(pieces) >= 2:
|
|
path = node['_path'] # type: str
|
|
key, grp, *_ = pieces
|
|
for group, conf in self._resolver.values():
|
|
if key == conf.key and path == conf.root:
|
|
if conf.slugify(group) == grp:
|
|
return GroupBySource(node, group, conf)
|
|
return None
|
|
|
|
|
|
# -----------------------------------
|
|
# Plugin Entry
|
|
# -----------------------------------
|
|
|
|
|
|
class GroupByPlugin(Plugin):
|
|
name = 'GroupBy Plugin'
|
|
description = 'Cluster arbitrary records with field attribute keyword.'
|
|
|
|
def on_setup_env(self, **extra: object) -> None:
|
|
self.creator = GroupByCreator()
|
|
self.env.add_build_program(GroupBySource, GroupByBuildProgram)
|
|
self.env.jinja_env.filters.update(groupby=GroupBySource.of_record)
|
|
|
|
# resolve /tag/rss/ -> /tag/rss/index.html (local server only)
|
|
@self.env.urlresolver
|
|
def a(node: SourceObject, parts: List[str]) -> Optional[GroupBySource]:
|
|
return self.creator.resolve_dev_server_path(node, parts)
|
|
|
|
# resolve virtual objects in admin UI
|
|
@self.env.virtualpathresolver(VPATH.lstrip('@'))
|
|
def b(node: SourceObject, parts: List[str]) -> Optional[GroupBySource]:
|
|
return self.creator.resolve_virtual_path(node, parts)
|
|
|
|
def _load_quick_config(self) -> None:
|
|
''' Load config file quick listeners. '''
|
|
config = self.get_config()
|
|
for key in config.sections():
|
|
if '.' in key: # e.g., key.fields and key.key_map
|
|
continue
|
|
|
|
watcher = self.creator.add_watcher(key, config)
|
|
split = config.get(key + '.split') # type: str
|
|
|
|
@watcher.grouping()
|
|
def _fn(args: GroupByCallbackArgs) -> Iterator[GroupKey]:
|
|
val = args.field
|
|
if isinstance(val, str):
|
|
val = val.split(split) if split else [val] # make list
|
|
if isinstance(val, list):
|
|
yield from val
|
|
|
|
def on_before_build_all(self, builder: Builder, **extra: object) -> None:
|
|
self.creator.clear_previous_results()
|
|
self._load_quick_config()
|
|
# let other plugins register their @groupby.watch functions
|
|
self.emit('before-build-all', groupby=self.creator, builder=builder)
|
|
self.config_dependencies = self.creator.get_dependencies()
|
|
self.creator.make_cluster(builder)
|
|
|
|
def on_before_build(self, source: SourceObject, **extra: object) -> None:
|
|
# before-build may be called before before-build-all (issue #1017)
|
|
# make sure it is evaluated immediatelly
|
|
self.creator.queue_now(source)
|
|
|
|
def on_after_build_all(self, builder: Builder, **extra: object) -> None:
|
|
self.creator.build_all(builder)
|
|
|
|
def on_after_prune(self, builder: Builder, **extra: object) -> None:
|
|
# TODO: find a better way to prune unreferenced elements
|
|
GroupByPruner.prune(builder)
|