rustdoc: always show crate name beside logo

This commit changes the layout to something a bit less "look at
my logo!!!111" gigantic, and makes it clearer where clicking the
logo will actually take you. It also means the crate name is
persistently at the top of the sidebar, even when in a sub-item
page, and clicking that name takes you back to the root.

Compare this with the layout at [Phoenix's Hexdocs] (which is
what this proposal is closely based on),
the old proposal on [Internals Discourse] (which always says
"Rust standard library" in the sidebar, but doesn't do the
side-by-side layout).

[Phoenix's Hexdocs]: https://hexdocs.pm/phoenix/1.7.7/overview.html
[Internals Discourse]: https://internals.rust-lang.org/t/poc-of-a-new-design-for-the-generated-rustdoc/11018

src/librustdoc/html/layout.rs

@@ -17,6 +17,7 @@ pub(crate) struct Layout {
     pub(crate) external_html: ExternalHtml,
     pub(crate) default_settings: FxHashMap<String, String>,
     pub(crate) krate: String,
+    pub(crate) krate_version: String,
     /// The given user css file which allow to customize the generated
     /// documentation theme.
     pub(crate) css_file_extension: Option<PathBuf>,

src/librustdoc/html/render/context.rs

@@ -534,6 +534,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             external_html,
             default_settings,
             krate: krate.name(tcx).to_string(),
+            krate_version: cache.crate_version.as_deref().unwrap_or_default().to_string(),
             css_file_extension: extension_css,
             scrape_examples_extension: !call_locations.is_empty(),
         };
@@ -669,10 +670,9 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
 
         let blocks = sidebar_module_like(all.item_sections());
         let bar = Sidebar {
-            title_prefix: "Crate ",
-            title: crate_name.as_str(),
+            title_prefix: "",
+            title: "",
             is_crate: false,
-            version: "",
             blocks: vec![blocks],
             path: String::new(),
         };

src/librustdoc/html/render/sidebar.rs

@@ -19,7 +19,6 @@ pub(super) struct Sidebar<'a> {
     pub(super) title_prefix: &'static str,
     pub(super) title: &'a str,
     pub(super) is_crate: bool,
-    pub(super) version: &'a str,
     pub(super) blocks: Vec<LinkBlock<'a>>,
     pub(super) path: String,
 }
@@ -99,12 +98,12 @@ pub(super) fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buf
         || it.is_primitive()
         || it.is_union()
         || it.is_enum()
-        || it.is_mod()
+        // crate title is displayed as part of logo lockup
+        || (it.is_mod() && !it.is_crate())
         || it.is_type_alias()
     {
         (
             match *it.kind {
-                clean::ModuleItem(..) if it.is_crate() => "Crate ",
                 clean::ModuleItem(..) => "Module ",
                 _ => "",
             },
@@ -113,14 +112,12 @@ pub(super) fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buf
     } else {
         ("", "")
     };
-    let version =
-        if it.is_crate() { cx.cache().crate_version.as_deref().unwrap_or_default() } else { "" };
     let path: String = if !it.is_mod() {
         cx.current.iter().map(|s| s.as_str()).intersperse("::").collect()
     } else {
         "".into()
     };
-    let sidebar = Sidebar { title_prefix, title, is_crate: it.is_crate(), version, blocks, path };
+    let sidebar = Sidebar { title_prefix, title, is_crate: it.is_crate(), blocks, path };
     sidebar.render_into(buffer).unwrap();
 }
 

src/librustdoc/html/static/css/rustdoc.css

@@ -461,19 +461,9 @@ img {
 	display: none !important;
 }
 
-.sidebar .logo-container {
-	margin-top: 10px;
-	margin-bottom: 10px;
-	text-align: center;
-}
-
-.version {
-	overflow-wrap: break-word;
-}
-
 .logo-container > img {
-	height: 100px;
-	width: 100px;
+	height: 48px;
+	width: 48px;
 }
 
 ul.block, .block li {
@@ -510,6 +500,8 @@ ul.block, .block li {
 	color: var(--sidebar-link-color);
 }
 .sidebar .current,
+.sidebar .current a,
+.sidebar-crate a.logo-container:hover + h2 a,
 .sidebar a:hover:not(.logo-container) {
 	background-color: var(--sidebar-current-link-background-color);
 }
@@ -524,6 +516,47 @@ ul.block, .block li {
 	overflow: hidden;
 }
 
+.sidebar-crate {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	margin: 0 32px;
+	column-gap: 32px;
+	flex-wrap: wrap;
+}
+
+.sidebar-crate h2 {
+	flex-grow: 1;
+	/* This setup with the margins and row-gap is designed to make flex-wrap
+		work the way we want. If they're in the side-by-side lockup, there
+		should be a 16px margin to the left of the logo (visually the same as
+		the 24px one on everything else, which are not giant circles) and 8px
+		between it and the crate's name and version. When they're line wrapped,
+		the logo needs to have the same margin on both sides of itself (to
+		center properly) and the crate name and version need 24px on their
+		left margin. */
+	margin: 0 -8px;
+}
+
+.sidebar-crate .logo-container {
+	margin: 10px -16px;
+	text-align: center;
+}
+
+.sidebar-crate h2 a {
+	display: block;
+	margin-left: -0.25rem;
+	padding-left: 0.25rem;
+	margin-right: -24px;
+}
+
+.sidebar-crate h2 .version {
+	display: block;
+	font-weight: normal;
+	font-size: 1rem;
+	overflow-wrap: break-word;
+}
+
 .mobile-topbar {
 	display: none;
 }

src/librustdoc/html/static/js/main.js

@@ -51,8 +51,12 @@ function setMobileTopbar() {
     // but with the current code it's hard to get the right information in the right place.
     const mobileLocationTitle = document.querySelector(".mobile-topbar h2");
     const locationTitle = document.querySelector(".sidebar h2.location");
-    if (mobileLocationTitle && locationTitle) {
-        mobileLocationTitle.innerHTML = locationTitle.innerHTML;
+    if (mobileLocationTitle) {
+        if (hasClass(document.body, "crate")) {
+            mobileLocationTitle.innerText = `Crate ${currentCrate}`;
+        } else if (locationTitle) {
+            mobileLocationTitle.innerHTML = locationTitle.innerHTML;
+        }
     }
 }
 

src/librustdoc/html/templates/page.html

@@ -89,13 +89,21 @@ <h2></h2> {# #}
     {% endif %}
     <nav class="sidebar"> {# #}
         {% if page.css_class != "src" %}
-        <a class="logo-container" href="{{page.root_path|safe}}{{krate_with_trailing_slash|safe}}index.html"> {# #}
-            {% if !layout.logo.is_empty() %}
-                <img src="{{layout.logo}}" alt="logo"> {# #}
-            {% else %}
-                <img class="rust-logo" src="{{static_root_path|safe}}{{files.rust_logo_svg}}" alt="logo"> {# #}
-            {% endif %}
-        </a> {# #}
+        <div class="sidebar-crate">
+            <a class="logo-container" href="{{page.root_path|safe}}{{krate_with_trailing_slash|safe}}index.html"> {# #}
+                {% if !layout.logo.is_empty() %}
+                    <img src="{{layout.logo}}" alt="logo"> {# #}
+                {% else %}
+                    <img class="rust-logo" src="{{static_root_path|safe}}{{files.rust_logo_svg}}" alt="logo"> {# #}
+                {% endif %}
+            </a> {# #}
+            <h2> {# #}
+                <a href="{{page.root_path|safe}}{{krate_with_trailing_slash|safe}}index.html">{{layout.krate}}</a> {# #}
+                {% if !layout.krate_version.is_empty() %}
+                    <span class="version">{{+ layout.krate_version}}</span>
+                {% endif %}
+            </h2>
+        </div>
         {% endif %}
         {{ sidebar|safe }}
     </nav> {# #}

src/librustdoc/html/templates/sidebar.html

@@ -6,9 +6,6 @@ <h2 class="location"> {# #}
 <div class="sidebar-elems">
     {% if is_crate %}
         <ul class="block">
-            {% if !version.is_empty() %}
-                <li class="version">Version {{+ version}}</li>
-            {% endif %}
             <li><a id="all-types" href="all.html">All Items</a></li> {# #}
         </ul>
     {% endif %}

tests/rustdoc-gui/huge-logo.goml

@@ -4,8 +4,8 @@ go-to: "file://" + |DOC_PATH| + "/huge_logo/index.html"
 
 set-window-size: (1280, 1024)
 // offsetWidth = width of sidebar
-assert-property: (".sidebar .logo-container", {"offsetWidth": "200", "offsetHeight": 100})
-assert-property: (".sidebar .logo-container img", {"offsetWidth": "100", "offsetHeight": 100})
+assert-property: (".sidebar-crate .logo-container", {"offsetWidth": "48", "offsetHeight": 48})
+assert-property: (".sidebar-crate .logo-container img", {"offsetWidth": "48", "offsetHeight": 48})
 
 set-window-size: (400, 600)
 // offset = size + margin

tests/rustdoc-gui/sidebar-mobile.goml

@@ -50,7 +50,7 @@ assert-position: ("#method\.must_use", {"y": 46})
 // Check that the bottom-most item on the sidebar menu can be scrolled fully into view.
 click: ".sidebar-menu-toggle"
 scroll-to: ".block.keyword li:nth-child(1)"
-compare-elements-position-near: (".block.keyword li:nth-child(1)", ".mobile-topbar", {"y": 543.19})
+compare-elements-position-near: (".block.keyword li:nth-child(1)", ".mobile-topbar", {"y": 544})
 
 // Now checking the background color of the sidebar.
 show-text: true

tests/rustdoc-gui/sidebar.goml

@@ -50,9 +50,9 @@ set-local-storage: {"rustdoc-theme": "light"}
 // We reload the page so the local storage settings are being used.
 reload:
 
-assert-text: (".sidebar > .location", "Crate test_docs")
-// In modules, we only have one "location" element.
-assert-count: (".sidebar .location", 1)
+assert-text: (".sidebar > .sidebar-crate > h2 > a", "test_docs")
+// Crate root has no "location" element
+assert-count: (".sidebar .location", 0)
 assert-count: (".sidebar h2", 1)
 assert-text: ("#all-types", "All Items")
 assert-css: ("#all-types", {"color": "#356da4"})
@@ -74,8 +74,9 @@ assert-text: ("#structs + .item-table .item-name > a", "Foo")
 click: "#structs + .item-table .item-name > a"
 
 // PAGE: struct.Foo.html
+assert-count: (".sidebar .sidebar-crate", 1)
 assert-count: (".sidebar .location", 1)
-assert-count: (".sidebar h2", 2)
+assert-count: (".sidebar h2", 3)
 // We check that there is no crate listed outside of the top level.
 assert-false: ".sidebar-elems > .crate"
 
@@ -94,7 +95,8 @@ click: ".sidebar-elems ul.crate > li:first-child > a"
 // PAGE: lib2/index.html
 go-to: "file://" + |DOC_PATH| + "/lib2/index.html"
 assert-property: (".sidebar", {"clientWidth": "200"})
-assert-text: (".sidebar > .location", "Crate lib2")
+assert-text: (".sidebar > .sidebar-crate > h2 > a", "lib2")
+assert-count: (".sidebar .location", 0)
 // We check that we have the crates list and that the "current" on is now "lib2".
 assert-text: (".sidebar-elems ul.crate > li > a.current", "lib2")
 // We now go to the "foobar" function page.
@@ -108,21 +110,25 @@ click: "#functions + .item-table .item-name > a"
 
 // PAGE: fn.foobar.html
 // In items containing no items (like functions or constants) and in modules, we have no
-// "location" elements. Only the parent module h2.
+// "location" elements. Only the parent module h2 and crate.
+assert-text: (".sidebar > .sidebar-crate > h2 > a", "lib2")
 assert-count: (".sidebar .location", 0)
-assert-count: (".sidebar h2", 1)
+assert-count: (".sidebar h2", 2)
 assert-text: (".sidebar .sidebar-elems h2", "In lib2")
 // We check that we don't have the crate list.
 assert-false: ".sidebar-elems > .crate"
 
 go-to: "./module/index.html"
 assert-property: (".sidebar", {"clientWidth": "200"})
+assert-text: (".sidebar > .sidebar-crate > h2 > a", "lib2")
 assert-text: (".sidebar > .location", "Module module")
+assert-count: (".sidebar .location", 1)
 // We check that we don't have the crate list.
 assert-false: ".sidebar-elems > .crate"
 
 go-to: "./sub_module/sub_sub_module/index.html"
 assert-property: (".sidebar", {"clientWidth": "200"})
+assert-text: (".sidebar > .sidebar-crate > h2 > a", "lib2")
 assert-text: (".sidebar > .location", "Module sub_sub_module")
 // We check that we don't have the crate list.
 assert-false: ".sidebar-elems .crate"
@@ -152,14 +158,14 @@ assert-property: (".sidebar", {"clientWidth": "200"})
 
 // Checks that all.html and index.html have their sidebar link in the same place.
 go-to: "file://" + |DOC_PATH| + "/test_docs/index.html"
-store-property: (".sidebar .location a", {
+store-property: (".sidebar .sidebar-crate h2 a", {
     "clientWidth": index_sidebar_width,
     "clientHeight": index_sidebar_height,
     "offsetTop": index_sidebar_y,
     "offsetLeft": index_sidebar_x,
 })
 go-to: "file://" + |DOC_PATH| + "/test_docs/all.html"
-assert-property: (".sidebar .location a", {
+assert-property: (".sidebar .sidebar-crate h2 a", {
     "clientWidth": |index_sidebar_width|,
     "clientHeight": |index_sidebar_height|,
     "offsetTop": |index_sidebar_y|,