Previously, links referencing a heading (`[[note#heading]]`) would just
link to the file name without including an anchor in the link target.
Now, such references will include an appropriate `#anchor` attribute.
Note that neither the original Markdown specification, nor the more
recent CommonMark standard, specify how anchors should be constructed
for a given heading.
There are also some differences between the various Markdown rendering
implementations.
Obsidian-export uses the [slug] crate to generate anchors which should
be compatible with most implementations, however your mileage may vary.
(For example, GitHub may leave a trailing `-` on anchors when headings
end with a smiley. The slug library, and thus obsidian-export, will
avoid such dangling dashes).
[slug]: https://crates.io/crates/slug
Previously, partial embeds (`![[note#heading]]`) would always include
the entire file into the source note. Now, such embeds will only include
the contents of the referenced heading (and any subheadings).
Links and embeds of [arbitrary blocks] remains unsupported at this time.
[arbitrary blocks]: https://publish.obsidian.md/help/How+to/Link+to+blocks
Links within an embedded note would point to other local resources
relative to the filesystem location of the note being embedded.
When a note inside a different directory would embed such a note, these
links would point to invalid locations.
Now these links are calculated relative to the top note, which ensures
these links will point to the right path.
This refactors the Context to maintain a list of all the files which
have been processed so far in a chain of embeds. This information is
then used to print a more helpful error message to users of the CLI when
RecursionLimitExceeded is returned.
