Template functions syntax

[srid]

contd. from #312 (comment)

Deprecate

[[z:zettels?tag=foo&timeline]]

in favour of

{{ zettels | tag=foo | timeline }}

• Folgezettel type would use {{...}}#
• Template function syntax maps to URIs underneath (the two types are isomorphic)
• The URI syntax will be deprecated but continue to be supported (as it is used as the underlying format in the Pandoc AST)
  • This enables us to do tag queries without the need to encode them.
• Template function syntax can be used to provide non-link-query related extensible features like Include markdown snippets #348 (comment)

[srid]

Wiki-links can simply become an alias for the 'link' template function, and we can rename 'zettels' to 'linkMany' for naming consistency:

{{ linkMany | tag = foo | cf }}
{{ link | some-note | cf }} is equivalent to [[some-note]]

[srid]

Can't say I'm totally convinced about doing this, but will leave it here as a concrete proposal for the record.

[srid]

Possibly outdated

I think we should prevent the folgezettel type here, `{{{ ... }}}`. Allow templates to create ordinary links only.

For folgezettel tagging, use #514

This constraint will allow us to define template functions that operate on the graph itself, for example:

{{ linksFrom | some-note | label=# }} 

That will list all noted from some-note.md using the [[Foo]]# syntax (which is an alias to [[[...]]]).

[srid]

Perhaps we should ditch this syntax entirely and do what Obsidian does; search query in a particular codeblock: https://help.obsidian.md/Plugins/Search#Embed+search+results (see its search operators)