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Improve page load performance in rustdoc
Add an explicit height to icons (which already had an explicit width) to allow browsers to lay out the page more accurately before the icons have been loaded. https://web.dev/optimize-cls/.
Add min-width: 115px to the crate search dropdown. When the HTML first loads, this dropdown includes only the text "All crates." Later, JS loads the items underneath it, some of which are wider. That causes the dropdown to get wider, causing a distracting reflow. This sets a min-width based on the size that the dropdown eventually becomes based on the crates on doc.rust-lang.org, reducing page movement during load.
Add font-display: swap. Per https://web.dev/font-display/, this prevents "flash of invisible text" during load by using a system font until the custom font is available. I've noticed this flash of invisible text occasionally when reading Rust docs. Note that users without cached fonts will see text, and then see it reflow. For `docs.rust-lang.org`, [setting caching headers will help a lot](https://github.com/rust-lang/simpleinfra/issues/62).
Generated output at https://jacob.hoffman-andrews.com/rust/flow-improvements/std/string/struct.String.html.
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Load rustdoc's JS search index on-demand.
Instead of being loaded on every page, the JS search index is now loaded when either (a) there is a `?search=` param, or (b) the search input is focused.
This saves both CPU and bandwidth. As of Feb 2021, https://doc.rust-lang.org/search-index1.50.0.js is 273,838 bytes gzipped or 2,544,939 bytes uncompressed. Evaluating it takes 445 ms of CPU time in Chrome 88 on a i7-10710U CPU (out of a total ~2,100 ms page reload).
Tested on Firefox and Chrome.
New:
https://jacob.hoffman-andrews.com/rust/search-on-demand/std/primitive.slice.html
https://jacob.hoffman-andrews.com/rust/search-on-demand/std/primitive.slice.html?search=fn
Old:
https://jacob.hoffman-andrews.com/rust/search-on-load/std/primitive.slice.html
https://jacob.hoffman-andrews.com/rust/search-on-load/std/primitive.slice.html?search=fn
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Add font-display: swap. Per https://web.dev/font-display/, this prevents
"flash of invisible text" during load by using a system font until the
custom font is available. I've noticed this flash of invisible text
occasionally when reading Rust docs.
Add an explicit height to icons (which already had an explicit width)
to allow browsers to lay out the page more accurately before the icons
have been loaded. https://web.dev/optimize-cls/.
Add min-width: 115px to the crate search dropdown. When the HTML first
loads, this dropdown includes only the text "All crates." Later, JS
loads the items underneath it, some of which are wider. That causes
the dropdown to get wider, causing a distracting reflow. This sets a
min-width based on the size that the dropdown eventually becomes based
on the crates on doc.rust-lang.org, reducing page movement during load.
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Instead of being loaded on every page, the JS search index is now
loaded when either (a) there is a `?search=` param, or (b) the search
input is focused.
This saves both CPU and bandwidth. As of Feb 2021,
https://doc.rust-lang.org/search-index1.50.0.js is 273,838 bytes
gzipped or 2,544,939 bytes uncompressed. Evaluating it takes 445 ms
of CPU time in Chrome 88 on a i7-10710U CPU (out of a total ~2,100
ms page reload).
Generate separate JS file with crate names.
This is much smaller than the full search index, and is used in the "hot
path" to draw the page. In particular it's used to crate the dropdown
for the search bar, and to append a list of crates to the sidebar (on
some pages).
Skip early search that can bypass 500ms timeout.
This was occurring when someone had typed some text during the load of
search-index.js. Their query was usually not ready to execute, and the
search itself is fairly expensive, delaying the overall load, which
delayed the input / keyup events, which delayed eventually executing the
query.
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This indicates that the div is an interactive element, and makes the
sidebar toggle "clickable" in assistive technologies.
Fixes #82582
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* Reuse memory
* simplify `next_def_id`, avoid multiple hashing and unnecessary lookups
* remove `all_fake_def_ids`, use the global map instead (probably not a good step toward parallelization, though...)
* convert `add_deref_target` to iterative implementation
* use `ArrayVec` where we know the max number of elements
* minor touchups here and there
* avoid building temporary vectors that get appended to other vectors
At most places I may or may not be doing the compiler's job is this PR.
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In HTML, when a button follows an input, if the enter keep is pressed on the input, instead of sending the submit event to the input, it'll create a click event on the button following it, which in this case made the help popup show up whenever "enter" was pressed.
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This gives warnings about dead code.
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* Remove a needless comma in the Rust code
* Replace double spaces after full stops with single spaces
Requested-by: @GuillaumeGomez
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
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We just plumb through what the user tells us.
This is flagged as unstable, mostly because I don't understand the
compatibility rules that rustdoc obeys for local storage data, and how
error handling of invalid data works.
We collect() the needed HashMap from Vec of Vecs of (key, value)
pairs, so that there is a nice place to add new more-specific options.
It would have been possible to use Extend::extend but doing it this
way ensures that all the used inputs are (and will stay) right next to
each other.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
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rustdoc has various user-configurable preferences. These are recorded
in web Local Storage (where available). But we want to provide a way
to configure the default default, including for when web storage is
not available.
getSettingValue is the function responsible for looking up these
settings. Here we make it fall back some in-DOM data, which
ultimately comes from RenderOptions.default_settings.
Using HTML data atrtributes is fairly convenient here, dsspite the
need to transform between snake and kebab case to avoid the DOM
converting kebab case to camel case (!)
We cache the element and dataset lookup in a global variable, to
ensure that getSettingValue remains fast.
The DOM representation has to be in an element which precedes the
inclusion of storage.js. That means it has to be in the <head> and we
should not use an empty <div> as the container (although most browsers
will accept that). An empty <script> element provides a convenient
and harmless container object. <meta> would be another possibility
but runs a greater risk of having unwanted behaviours on weird
browsers.
We trust the RenderOptions not to contain unhelpful setting names,
which don't fit nicely into an HTML attribute. It's awkward to quote
dataset keys.
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
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Add help button
Part of #75197.
Here is a screenshot of the result:

r? @jyn514
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Disable all themes other than `light.css` to prevent rule conflicts
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rustdoc: fixes #64305: disable search field instead of hidding it
The result seems to be ok but I wasn't entirely sure how to get there. I tried to stay generic a bit but maybe it's not required at all.
@GuillaumeGomez
Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
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Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
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This means that callers can pass in a closure like
`|buf| some_function(..., &mut buf)` and pass in arbitrary arguments to
that function without complicating the trait definition. We also keep
the impl for str and String, since it's useful to be able to just pass
in "" or format!("{}"...) results in some cases.
This changes Print's definition to take self, instead of &self, because
otherwise FnOnce cannot be called directly. We could instead take FnMut
or even Fn, but that seems like it'd merely complicate matters -- most
of the time, the FnOnce does not constrain us at all anyway. If it does,
a custom Print impl for &'_ SomeStruct is not all that painful.
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This avoids needlessly creating and threading the buffers through when
we only use them once.
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This reverts commit d79a01b72f4722611cb21b719e6243aad3e7ec3c.
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The layout of the left side menu in docs reflows when navigating between pages because of missing height on the <img> element of rust logo.
Setting height='100' tells the browser to reserve that vertical space, leading to a less janky experience.
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Add no-crate filter option on rustdoc
@onur asked me about it so here it is!
r? @QuietMisdreavus
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