Fix docs for abstract_delimiter

[craigbox]

The copy and paste from abstract_chars_count didn't match abstract_delimiter.

If you tried -1:

ERROR   -  Config value 'plugins': Plugin 'rss' option 'abstract_delimiter': Expected type: <class 'str'> but received: <class 'int'>

"" works well.

[YDX-2147483647]

Here're the corresponding implementation (to help the maintainer review).

mkdocs-rss-plugin/mkdocs_rss_plugin/config.py

Lines 16 to 20 in ae2459c

	class RssPluginConfig(Config):
	"""Configuration for RSS plugin for Mkdocs."""
	abstract_chars_count = config_options.Type(int, default=160)
	abstract_delimiter = config_options.Type(str, default="<!-- more -->")

mkdocs-rss-plugin/mkdocs_rss_plugin/util.py

Lines 446 to 459 in ae2459c

	def get_description_or_abstract(
	self, in_page: Page, chars_count: int = 160, abstract_delimiter: str = None
	) -> str:
	"""Returns description from page meta. If it doesn't exist, use the \
	{chars_count} first characters from page content (in markdown).
	:param Page in_page: page to look at
	:param int chars_count: if page.meta.description is not set, number of chars \
	of the content to use. Defaults to: 160 - optional
	:param str abstract_delimiter: description delimeter, defaults to None
	:return: page description to use
	:rtype: str
	"""

(↑delimeter is misspelled)

The following if will fail if abstract_delimiter is "", therefore it will behave as if the delimiter does not exist.

mkdocs-rss-plugin/mkdocs_rss_plugin/util.py

Lines 479 to 489 in ae2459c

	elif (
	abstract_delimiter
	and (
	excerpt_separator_position := in_page.markdown.find(abstract_delimiter)
	)
	> -1
	):
	return markdown.markdown(
	in_page.markdown[:excerpt_separator_position],
	output_format="html5",
	)

By the way, abstract_delimiter: "" is not tested yet.

[Guts]

Hi @craigbox ,

Thanks for reporting.
Your PR is definitely at the top of my list for my next dev time on this project.

I would prefer that the code works as expected and documented, instead of changing the documentation.
I'll look into what you already identified @YDX-2147483647. Thanks you a lot for making my life easier 🤗

@craigbox in the meantime can you rebase on origin/main and try again please?

[craigbox]

Rebased and pushed. (The spelling of "delimiter" has already been fixed.)

[Guts]

I close here since #268 fixed the logic behind.