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@tt{.html} targets of the source documents.
@defproc[(here-output-path) path?]
Returns the path to the current output file, relative to @racket[current-project-root]. If no metas
are available, raises an error. This is like what you can get from the @tt{here} variable that Pollen
provides, except it is available outside templates.
@defproc[(here-id [suffix (or/c (listof string?) string? #f) #f]) string?]
Returns the 8-character prefix of the SHA1 hash of the current document’s output path. If no metas
are available, raises an error. If @racket[_suffix] evaluates to a string or a list of strings, they
are appended verbatim to the end of the hash.
This ID is used when creating URL fragment links within an article, such as for footnotes and index
entries. As long as the web version of the article is not moved to a new URL, the ID will remain the
same, which ensures deep links using the ID don’t break. The ID also ensures each article’s internal
links will be unique, so that links do not collide when multiple articles are being shown on
a single HTML page.
@section{Metas and @code{txexpr}s}
@defproc[(maybe-attr [key symbol?] [attrs txexpr-attrs?] [missing-expr any/c ""]) any/c]
Find the value of @racket[_key] in the supplied list of attributes, returning the value of
@racket[_missing-expr] if it’s not there.
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