Tag listing with AND filtering ?

[SomeFrenchGuy]

Is there a possibility when adding a Tag listing, to use a AND filter on tags ? so I can show only links to file with a certain set of tags.

[kamilkrzyskow]

Hi @SomeFrenchGuy,
the tags plugin code is a bit complex, with the business logic, __and__ operator override, maybe some recursion, and I haven't used the plugin to its fullest potential, so it's only my uneducated guesses going forward ;p

Following the thread of the code below:

Template that renders the listing key variable: listing.mappings
https://github.com/squidfunk/mkdocs-material/blob/master/src/templates/fragments/tags/default/listing.html

Code that populates the listings

mkdocs-material/src/plugins/tags/plugin.py

Lines 186 to 187 in b2d235e

	# Populate and render all listings
	self.listings.populate_all(self.mappings, Renderer(env, config))

Filtering of the listing

mkdocs-material/material/plugins/tags/structure/listing/__init__.py

Lines 155 to 158 in b2d235e

	# If an inclusion list is given, expand each tag to check if the tag
	# itself or one of its parents is included in the listing
	if self.config.include:
	return mapping & self.config.include

Filtering of the mapping

mkdocs-material/material/plugins/tags/structure/mapping/__init__.py

Lines 83 to 86 in b2d235e

	# Iterate over expanded tags
	for tag in self.tags:
	if set(tag) & tags:
	yield tag

I would guess that you'd have to modify the code in the last mapping filtering part.
Currently it loops over every tag in the mapping and compares it to the tags in the include
Replace the logic to check for inclusion of all tags in the include, if not all are included return an empty iterator.

I think you can use a hook together with monkey patching to replace the __and__ override. But I don't know if overriding operators of other classes is possible 🤔

Example of hooks with monkey patches:
https://github.com/Gothic-Modding-Community/gmc/tree/dev/overrides/.hooks

[squidfunk]

Currently not possible, and please note that monkey patching always comes at a certain risk and should be a last-resort. Could you create a motivating example of why you need this and how you imagine this to work? If we agree that this is a use case that we want to support, we can certainly add it to our backlog ☺️