Disable stylesheet objects rather than link elements

src/librustdoc/config.rs

@@ -428,7 +428,7 @@ impl Options {
                     ))
                     .emit();
                 }
-                themes.push(StylePath { path: theme_file, disabled: true });
+                themes.push(StylePath { path: theme_file });
             }
         }
 

src/librustdoc/html/layout.rs

@@ -50,8 +50,7 @@ pub fn render<T: Print, S: Print>(
     <meta name=\"keywords\" content=\"{keywords}\">\
     <title>{title}</title>\
     <link rel=\"stylesheet\" type=\"text/css\" href=\"{static_root_path}normalize{suffix}.css\">\
-    <link rel=\"stylesheet\" type=\"text/css\" href=\"{static_root_path}rustdoc{suffix}.css\" \
-          id=\"mainThemeStyle\">\
+    <link rel=\"stylesheet\" type=\"text/css\" href=\"{static_root_path}rustdoc{suffix}.css\">\
     {style_files}\
     <script src=\"{static_root_path}storage{suffix}.js\"></script>\
     <noscript><link rel=\"stylesheet\" href=\"{static_root_path}noscript{suffix}.css\"></noscript>\
@@ -171,17 +170,11 @@ pub fn render<T: Print, S: Print>(
         krate = layout.krate,
         style_files = style_files
             .iter()
-            .filter_map(|t| {
-                if let Some(stem) = t.path.file_stem() { Some((stem, t.disabled)) } else { None }
-            })
-            .filter_map(|t| {
-                if let Some(path) = t.0.to_str() { Some((path, t.1)) } else { None }
-            })
+            .filter_map(|t| t.path.file_stem())
+            .filter_map(|t| t.to_str())
             .map(|t| format!(
-                r#"<link rel="stylesheet" type="text/css" href="{}.css" {} {}>"#,
-                Escape(&format!("{}{}{}", static_root_path, t.0, page.resource_suffix)),
-                if t.1 { "disabled" } else { "" },
-                if t.0 == "light" { "id=\"themeStyle\"" } else { "" }
+                r#"<link rel="stylesheet" type="text/css" href="{}.css">"#,
+                Escape(&format!("{}{}{}", static_root_path, t, page.resource_suffix)),
             ))
             .collect::<String>(),
         suffix = page.resource_suffix,

src/librustdoc/html/markdown.rs

@@ -1148,8 +1148,6 @@ pub struct IdMap {
 fn init_id_map() -> FxHashMap<String, usize> {
     let mut map = FxHashMap::default();
     // This is the list of IDs used by rustdoc templates.
-    map.insert("mainThemeStyle".to_owned(), 1);
-    map.insert("themeStyle".to_owned(), 1);
     map.insert("theme-picker".to_owned(), 1);
     map.insert("theme-choices".to_owned(), 1);
     map.insert("settings-menu".to_owned(), 1);

src/librustdoc/html/render/mod.rs

@@ -344,8 +344,6 @@ impl Serialize for TypeWithKind {
 pub struct StylePath {
     /// The path to the theme
     pub path: PathBuf,
-    /// What the `disabled` attribute should be set to in the HTML tag
-    pub disabled: bool,
 }
 
 thread_local!(pub static CURRENT_DEPTH: Cell<usize> = Cell::new(0));
@@ -472,14 +470,9 @@ impl FormatRenderer for Context {
         //
         // Note that these must be added before `sources::render` is called
         // so that the resulting source pages are styled
-        //
-        // `light.css` is not disabled because it is the stylesheet that stays loaded
-        // by the browser as the theme stylesheet. The theme system (hackily) works by
-        // changing the href to this stylesheet. All other themes are disabled to
-        // prevent rule conflicts
-        scx.style_files.push(StylePath { path: PathBuf::from("light.css"), disabled: false });
-        scx.style_files.push(StylePath { path: PathBuf::from("dark.css"), disabled: true });
-        scx.style_files.push(StylePath { path: PathBuf::from("ayu.css"), disabled: true });
+        scx.style_files.push(StylePath { path: PathBuf::from("light.css") });
+        scx.style_files.push(StylePath { path: PathBuf::from("dark.css") });
+        scx.style_files.push(StylePath { path: PathBuf::from("ayu.css") });
 
         let dst = output;
         scx.ensure_dir(&dst)?;
@@ -568,7 +561,7 @@ impl FormatRenderer for Context {
 
         let mut style_files = self.shared.style_files.clone();
         let sidebar = "<p class='location'>Settings</p><div class='sidebar-elems'></div>";
-        style_files.push(StylePath { path: PathBuf::from("settings.css"), disabled: false });
+        style_files.push(StylePath { path: PathBuf::from("settings.css") });
         let v = layout::render(
             &self.shared.layout,
             &page,
@@ -808,7 +801,7 @@ themePicker.onblur = handleThemeButtonsBlur;
     var but = document.createElement('button');
     but.textContent = item;
     but.onclick = function(el) {{
-        switchTheme(currentTheme, mainTheme, item, true);
+        switchTheme(item, true);
     }};
     but.onblur = handleThemeButtonsBlur;
     themes.appendChild(but);
@@ -843,8 +836,11 @@ themePicker.onblur = handleThemeButtonsBlur;
             &cx.shared.fs,
             cx.path("storage.js"),
             &format!(
-                "var resourcesSuffix = \"{}\";{}",
+                r#"var resourcesSuffix = "{}";
+var allThemeNames = {};
+{}"#,
                 cx.shared.resource_suffix,
+                serde_json::to_string(&themes).unwrap(),
                 static_files::STORAGE_JS
             ),
             options.enable_minification,

src/librustdoc/html/static/storage.js

@@ -1,8 +1,6 @@
 // From rust:
 /* global resourcesSuffix */
-
-var currentTheme = document.getElementById("themeStyle");
-var mainTheme = document.getElementById("mainThemeStyle");
+/* global allThemeNames */
 
 var savedHref = [];
 
@@ -87,29 +85,30 @@ function getCurrentValue(name) {
     return null;
 }
 
-function switchTheme(styleElem, mainStyleElem, newTheme, saveTheme) {
-    var fullBasicCss = "rustdoc" + resourcesSuffix + ".css";
-    var fullNewTheme = newTheme + resourcesSuffix + ".css";
-    var newHref = mainStyleElem.href.replace(fullBasicCss, fullNewTheme);
-
-    if (styleElem.href === newHref) {
-        return;
-    }
+function switchTheme(newTheme, saveTheme) {
+    // The theme file we are switching to
+    var newThemeFile = newTheme + resourcesSuffix + ".css";
 
     var found = false;
     if (savedHref.length === 0) {
         onEachLazy(document.getElementsByTagName("link"), function(el) {
             savedHref.push(el.href);
         });
     }
-    onEach(savedHref, function(el) {
-        if (el === newHref) {
+    onEach(savedHref, function(href) {
+        if (href.endsWith(newThemeFile)) {
             found = true;
             return true;
         }
     });
     if (found === true) {
-        styleElem.href = newHref;
+        onEach(allThemeNames, function(themeName) {
+            // The theme file for this theme name
+            var themeFile = themeName + resourcesSuffix + ".css";
+            var themeSheet = document.querySelector("[href$='" + themeFile + "']");
+
+            themeSheet.disabled = themeName !== newTheme;
+        });
         // If this new value comes from a system setting or from the previously saved theme, no
         // need to save it.
         if (saveTheme === true) {
@@ -123,6 +122,4 @@ function getSystemValue() {
     return property.replace(/[\"\']/g, "");
 }
 
-switchTheme(currentTheme, mainTheme,
-            getCurrentValue("rustdoc-theme") || getSystemValue() || "light",
-            false);
+switchTheme(getCurrentValue("rustdoc-theme") || getSystemValue() || "light", false);