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import uuid
from collections import namedtuple
from html.parser import HTMLParser
import mistune
from lektor.pluginsystem import Plugin
from lektor.utils import slugify
from markupsafe import Markup, escape
TocEntry = namedtuple("TocEntry", ["anchor", "title", "children"])
def get_int_config(config, key, default, minimum=None, maximum=None):
value = config.get(key, str(default))
try:
value = int(value)
except (TypeError, ValueError):
value = default
if minimum is not None:
value = max(value, minimum)
if maximum is not None:
value = min(value, maximum)
return value
class BlogMarkdownHeadingsPlugin(Plugin):
name = "Blog Markdown Headings"
description = (
"Adds Markdown heading anchors, TOC metadata, and configurable heading offsets."
)
def on_markdown_config(self, config, **extra):
plugin_config = self.get_config()
anchor_type = plugin_config.get("anchors.type", "slug")
heading_offset = get_int_config(
plugin_config,
"headings.offset",
default=2,
minimum=-5,
maximum=5,
)
max_heading_level = get_int_config(
plugin_config,
"headings.max_level",
default=6,
minimum=1,
maximum=6,
)
min_heading_level = get_int_config(
plugin_config,
"headings.min_level",
default=1,
minimum=1,
maximum=6,
)
def adjusted_level(level):
return min(
max(level + heading_offset, min_heading_level),
max_heading_level,
)
config.renderer_mixins.append(
renderer_mixin_factory(
anchor_type=anchor_type,
adjusted_level=adjusted_level,
)
)
def on_markdown_meta_init(self, meta, **extra):
meta["toc"] = []
def on_markdown_meta_postprocess(self, meta, **extra):
prev_level = None
toc = []
stack = [toc]
for level, anchor, title in meta["toc"]:
if prev_level is None:
prev_level = level
elif prev_level == level - 1:
stack.append(stack[-1][-1].children)
prev_level = level
elif prev_level > level:
while prev_level > level:
if len(stack) > 1:
stack.pop()
prev_level -= 1
stack[-1].append(TocEntry(anchor, title, []))
meta["toc"] = toc
def renderer_mixin_factory(anchor_type, adjusted_level):
def render_heading(text, original_level, meta, raw=None):
level = adjusted_level(original_level)
if anchor_type == "random":
anchor = uuid.uuid4().hex[:6]
else:
if raw is None:
raw = escape(_strip_tags(text))
anchor = slugify(raw)
meta["toc"].append((level, anchor, Markup(text)))
return '<h%d id="%s">%s</h%d>' % (level, anchor, text, level)
class RendererMixinMistune0(object):
def header(self, text, level, raw):
return render_heading(text, level, self.meta, raw)
class RendererMixinMistune2(object):
def heading(self, text, level):
meta = self.lektor.meta
return render_heading(text, level, meta)
if mistune.__version__.startswith("0."):
return RendererMixinMistune0
if mistune.__version__.startswith("2."):
return RendererMixinMistune2
raise RuntimeError("Unsupported mistune version: %s" % mistune.__version__)
def _strip_tags(inline_html):
parser = _StripTagsParser()
parser.feed(inline_html)
return parser.close()
class _StripTagsParser(HTMLParser):
def reset(self):
super().reset()
self._data = []
def handle_data(self, data):
self._data.append(data)
def close(self):
super().close()
return "".join(self._data)
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