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If NetNewsWire detects that a link points to a footnote within the same
post, then tapping on that link will produce a popover displaying the
text of said footnote. Otherwise, it is treated as a regular link and
opened in the default web browser.
Detecting a footnote requires two things:
1. The link URL must consist only of a fragment (i.e. it begins with
`#`).
2. There must exist another element (typically `<li>`) in the post’s
HTML with an `id` attribute matching the fragment (that is, the text
after `#`).
Because FreshRSS’s web frontend can display multiple articles at once,
all relative URLs (including bare fragments) are automatically converted
to absolute URLs at ingestion time, and `id` attributes are replaced
with `data-sanitized-id` attributes. These changes avoid conflicts in
the web UI, but they break NNW’s footnote detection.
Since I use FreshRSS solely as a backend service for NNW (and other
clients), it is reasonable for me to disable those two sanitization
steps in order to take full advantage of NNW’s features.
Remove `id` from the list of attributes to rename, and add it to the
list of allowed attributes for `<li>` elements (as otherwise, it would
be stripped entirely). Convert the `absolutize_url()` function into a
no-op if the relative URL provided appears to be a local fragment.
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Daniel Smith
Alexandre Alapetite
