This switches from ASCII lowercase to Unicode lowercase when generating
heading IDs. This brings mdbook more in line with other tools and sites
when they generate heading IDs. The generation still isn't 100% the same
as other tools and sites, but it is usually the same in most cases.
Closes https://github.com/rust-lang/mdBook/issues/1059
With the migration to Font Awesome 6, I'm running into books where the
icon names are missing or have changed. This adds a warning to help
identify those situations.
This fixes links on the print page that go to an internal destination
that is not a chapter. The path would have the wrong relative
destination, and would be broken. The logic for detecting this was
incorrectly only checking if a link went outside the book, or didn't
have an html extension. This doesn't work for links to HTML files that
are inside the book, but not one of the chapters.
This changes it so that header and `<dt>` tags manually written as HTML
are not modified (no anchor, no id, etc.). This is to avoid mangling any
HTML that the user explicitly crafted.
I'm not sure what the fallout from the headers might be, since I'm not
100% sure there aren't uses where the user wanted mdbook to modify
manual HTML. However, I don't see any in rust-lang's use.
This adds the method `contains_key` to assist with detecting if a key is
set in the config. There have been a few scenarios where I have needed
this when upgrading to 0.5. For now this only supports the `output` and
`preprocessor`. Checking the presence in the other tables isn't easy,
but could potentially be added if needed.
Comments in code examples often rely on exact column alignment,
e.g. for ASCII-art. This alignment often relies on both code and
comment characters having exactly the same width.
Setting `font-style: italic` seems to break these invariants with
common monospace fonts used by browsers. This may be due to font
synthesis when the monospace font does not have a native italic
variant.
E.g., see these code examples when using the `ayu` theme:
- https://doc.rust-lang.org/1.90.0/reference/types/closure.html#r-type.closure.drop-order
- https://doc.rust-lang.org/1.90.0/reference/types/impl-trait.html#r-type.impl-trait.generic-capture.precise.use
It seems more important to have correct alignment than to style these
elements in italics, so let's drop the italic styling.
One alternative would be to set `font-synthesis: none` instead. This
would prevent font synthesis-related misalignment while still
rendering italics when a font supports italics natively. This might
correct the alignment issue, but ASCII-art in comments often wants
vertical bars to actually be vertical, so it still seems better to
just turn off italics entirely.
A more minimal change might be to only drop this from comments and not
from `hljs-quote`, but it seems the styling for these classes are
usually kept in sync, so we preserve that here.
This makes sure that the sidebar headings don't have the `<mark>` tag.
When these are created, the Marker is unable to remove them from the
sidebar (and we don't want them there in the first place).
I suspect we'll want more filtering in the future, but I'm not sure
exactly what to filter. Alternatively, it could have an allow list of
tags, and filter all others out.
