mirror of
https://github.com/squidfunk/mkdocs-material.git
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301 lines
12 KiB
Python
301 lines
12 KiB
Python
# Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to
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# deal in the Software without restriction, including without limitation the
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# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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# sell copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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from __future__ import annotations
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import logging
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import os
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import yaml
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from copy import copy
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from markdown import Markdown
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from material.plugins.blog.author import Author
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from mkdocs.config.defaults import MkDocsConfig
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from mkdocs.exceptions import PluginError
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from mkdocs.structure.files import File, Files
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from mkdocs.structure.nav import Section
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from mkdocs.structure.pages import Page, _RelativePathTreeprocessor
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from mkdocs.structure.toc import get_toc
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from mkdocs.utils.meta import YAML_RE
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from re import Match
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from yaml import SafeLoader
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from .config import PostConfig
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from .markdown import ExcerptTreeprocessor
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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# Post
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class Post(Page):
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# Initialize post - posts are never listed in the navigation, which is why
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# they will never include a title that was manually set, so we can omit it
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def __init__(self, file: File, config: MkDocsConfig):
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super().__init__(None, file, config)
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# Resolve path relative to docs directory
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docs = os.path.relpath(config.docs_dir)
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path = os.path.relpath(file.abs_src_path, docs)
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# Read contents and metadata immediately
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with open(file.abs_src_path, encoding = "utf-8") as f:
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self.markdown = f.read()
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# Sadly, MkDocs swallows any exceptions that occur during parsing.
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# As we want to provide the best possible authoring experience, we
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# need to catch errors early and display them nicely. We decided to
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# drop support for MkDocs' MultiMarkdown syntax, because it is not
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# correctly implemented anyway. When using MultiMarkdown syntax, all
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# date formats are returned as strings and list are not properly
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# supported. Thus, we just use the relevants parts of `get_data`.
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match: Match = YAML_RE.match(self.markdown)
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if not match:
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raise PluginError(
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f"Error reading metadata of post '{path}' in '{docs}':\n"
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f"Expected metadata to be defined but found nothing"
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)
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# Extract metadata and parse as YAML
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try:
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self.meta = yaml.load(match.group(1), SafeLoader) or {}
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self.markdown = self.markdown[match.end():].lstrip("\n")
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# The post's metadata could not be parsed because of a syntax error,
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# which we display to the user with a nice error message
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except Exception as e:
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raise PluginError(
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f"Error reading metadata of post '{path}' in '{docs}':\n"
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f"{e}"
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)
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# Initialize post configuration, but remove all keys that this plugin
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# doesn't care about, or they will be reported as invalid configuration
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self.config: PostConfig = PostConfig(file.abs_src_path)
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self.config.load_dict({
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key: self.meta[key] for key in (
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set(self.meta.keys()) &
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set(self.config.keys())
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)
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})
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# Validate configuration and throw if errors occurred
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errors, warnings = self.config.validate()
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for _, w in warnings:
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log.warning(w)
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for k, e in errors:
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raise PluginError(
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f"Error reading metadata '{k}' of post '{path}' in '{docs}':\n"
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f"{e}"
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)
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# Excerpts are subsets of posts that are used in pages like archive and
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# category views. They are not rendered as standalone pages, but are
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# rendered in the context of a view. Each post has a dedicated excerpt
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# instance which is reused when rendering views.
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self.excerpt: Excerpt = None
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# Initialize authors and actegories
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self.authors: list[Author] = []
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self.categories: list[Category] = []
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# Ensure template is set or use default
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self.meta.setdefault("template", "blog-post.html")
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# Ensure template hides navigation
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self.meta["hide"] = self.meta.get("hide", [])
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if "navigation" not in self.meta["hide"]:
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self.meta["hide"].append("navigation")
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# The contents and metadata were already read in the constructor (and not
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# in `read_source` as for pages), so this function must be set to a no-op
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def read_source(self, config: MkDocsConfig):
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pass
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# -----------------------------------------------------------------------------
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# Excerpt
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class Excerpt(Page):
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# Initialize an excerpt for the given post - we create the Markdown parser
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# when intitializing the excerpt in order to improve rendering performance
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# for excerpts, as they are reused across several different views, because
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# posts might be referenced from multiple different locations
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def __init__(self, post: Post, config: MkDocsConfig, files: Files):
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self.file = copy(post.file)
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self.post = post
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# Set canonical URL, or we can't print excerpts when debugging the
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# blog plugin, as the `abs_url` property would be missing
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self._set_canonical_url(config.site_url)
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# Initialize configuration and metadata
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self.config = post.config
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self.meta = post.meta
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# Initialize authors and categories - note that views usually contain
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# subsets of those lists, which is why we need to manage them here
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self.authors: list[Author] = []
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self.categories: list[Category] = []
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# Initialize parser - note that we need to patch the configuration,
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# more specifically the table of contents extension
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config = _patch(config)
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self.md = Markdown(
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extensions = config.markdown_extensions,
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extension_configs = config.mdx_configs,
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)
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# Register excerpt tree processor - this processor resolves anchors to
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# posts from within views, so they point to the correct location
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self.md.treeprocessors.register(
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ExcerptTreeprocessor(post),
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"excerpt",
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0
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)
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# Register relative path tree processor - this processor resolves links
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# to other pages and assets, and is used by MkDocs itself
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self.md.treeprocessors.register(
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_RelativePathTreeprocessor(self.file, files, config),
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"relpath",
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1
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)
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# Render an excerpt of the post on the given page - note that this is not
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# thread-safe because excerpts are shared across views, as it cuts down on
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# the cost of initialization. However, if in the future, we decide to render
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# posts and views concurrently, we must change this behavior.
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def render(self, page: Page, separator: str):
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self.file.url = page.url
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# Retrieve excerpt tree processor and set page as base
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at = self.md.treeprocessors.get_index_for_name("excerpt")
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processor: ExcerptTreeprocessor = self.md.treeprocessors[at]
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processor.base = page
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# Ensure that the excerpt includes a title in its content, since the
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# title is linked to the post when rendering - see https://t.ly/5Gg2F
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self.markdown = self.post.markdown
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if not self.post._title_from_render:
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self.markdown = "\n\n".join([f"# {self.post.title}", self.markdown])
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# Convert Markdown to HTML and extract excerpt
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self.content = self.md.convert(self.markdown)
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self.content, *_ = self.content.split(separator, 1)
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# Extract table of contents and reset post URL - if we wouldn't reset
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# the excerpt URL, linking to the excerpt from the view would not work
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self.toc = get_toc(getattr(self.md, "toc_tokens", []))
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self.file.url = self.post.url
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# -----------------------------------------------------------------------------
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# View
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class View(Page):
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# Parent view
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parent: View | Section
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# Initialize view
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def __init__(self, name: str | None, file: File, config: MkDocsConfig):
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super().__init__(None, file, config)
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# Initialize name of the view - note that views never pass a title to
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# the parent constructor, so the author can always override the title
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# that is used for rendering. However, for some purposes, like for
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# example sorting, we need something to compare.
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self.name = name
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# Initialize posts and views
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self.posts: list[Post] = []
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self.views: list[View] = []
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# Initialize pages for pagination
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self.pages: list[View] = []
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# Set necessary metadata
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def read_source(self, config: MkDocsConfig):
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super().read_source(config)
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# Ensure template is set or use default
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self.meta.setdefault("template", "blog.html")
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# -----------------------------------------------------------------------------
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# Archive view
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class Archive(View):
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pass
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# -----------------------------------------------------------------------------
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# Category view
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class Category(View):
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pass
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# -----------------------------------------------------------------------------
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# Helper functions
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# -----------------------------------------------------------------------------
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# Patch configuration
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def _patch(config: MkDocsConfig):
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config = copy(config)
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# Copy parts of configuration that needs to be patched
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config.validation = copy(config.validation)
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config.validation.links = copy(config.validation.links)
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config.markdown_extensions = copy(config.markdown_extensions)
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config.mdx_configs = copy(config.mdx_configs)
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# Make sure that the author did not add another instance of the table of
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# contents extension to the configuration, as this leads to weird behavior
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if "markdown.extensions.toc" in config.markdown_extensions:
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config.markdown_extensions.remove("markdown.extensions.toc")
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# In order to render excerpts for posts, we need to make sure that the
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# table of contents extension is appropriately configured
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config.mdx_configs["toc"] = {
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**config.mdx_configs.get("toc", {}),
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**{
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"anchorlink": True, # Render headline as clickable
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"baselevel": 2, # Render h1 as h2 and so forth
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"permalink": False, # Remove permalinks
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"toc_depth": 2 # Remove everything below h2
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}
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}
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# Additionally, we disable link validation when rendering excerpts, because
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# invalid links have already been reported when rendering the page
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links = config.validation.links
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links.not_found = logging.DEBUG
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links.absolute_links = logging.DEBUG
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links.unrecognized_links = logging.DEBUG
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# Return patched configuration
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return config
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# -----------------------------------------------------------------------------
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# Data
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# -----------------------------------------------------------------------------
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# Set up logging
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log = logging.getLogger("mkdocs.material.blog")
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