Rollup merge of rust-lang#93097 - GuillaumeGomez:settings-js, r=jsha

Switch settings menu to full js

Since the settings can only be set when the JS is enabled, it's not really a problem. It also fixes a debate we had around the themes not being accessible easily before.

![Screenshot from 2022-01-19 23-06-59](https://user-images.githubusercontent.com/3050060/150221936-fd1a1e76-06b6-4416-a653-dbae111979ed.png)

You can test it [here](https://rustdoc.crud.net/imperio/settings-js/doc/foo/index.html).

r? `@jsha`

Author: GuillaumeGomez

src/librustdoc/html/markdown.rs

@@ -1440,6 +1440,10 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     let mut map = FxHashMap::default();
     // This is the list of IDs used in Javascript.
     map.insert("help".into(), 1);
+    map.insert("settings".into(), 1);
+    map.insert("not-displayed".into(), 1);
+    map.insert("alternative-display".into(), 1);
+    map.insert("search".into(), 1);
     // This is the list of IDs used in HTML generated in Rust (including the ones
     // used in tera template files).
     map.insert("mainThemeStyle".into(), 1);
@@ -1449,7 +1453,6 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("settings-menu".into(), 1);
     map.insert("help-button".into(), 1);
     map.insert("main-content".into(), 1);
-    map.insert("search".into(), 1);
     map.insert("crate-search".into(), 1);
     map.insert("render-detail".into(), 1);
     map.insert("toggle-all-docs".into(), 1);

src/librustdoc/html/render/context.rs

@@ -17,8 +17,8 @@ use super::print_item::{full_path, item_path, print_item};
 use super::search_index::build_index;
 use super::write_shared::write_shared;
 use super::{
-    collect_spans_and_sources, print_sidebar, scrape_examples_help, settings, AllTypes,
-    LinkFromSrc, NameDoc, StylePath, BASIC_KEYWORDS,
+    collect_spans_and_sources, print_sidebar, scrape_examples_help, AllTypes, LinkFromSrc, NameDoc,
+    StylePath, BASIC_KEYWORDS,
 };
 
 use crate::clean::{self, types::ExternalLocation, ExternalCrate};
@@ -589,21 +589,18 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
         page.root_path = "./";
 
         let sidebar = "<h2 class=\"location\">Settings</h2><div class=\"sidebar-elems\"></div>";
-        let theme_names: Vec<String> = self
-            .shared
-            .style_files
-            .iter()
-            .map(StylePath::basename)
-            .collect::<Result<_, Error>>()?;
         let v = layout::render(
             &self.shared.layout,
             &page,
             sidebar,
-            settings(
-                self.shared.static_root_path.as_deref().unwrap_or("./"),
-                &self.shared.resource_suffix,
-                theme_names,
-            )?,
+            |buf: &mut Buffer| {
+                write!(
+                    buf,
+                    "<script defer src=\"{}settings{}.js\"></script>",
+                    page.static_root_path.unwrap_or(""),
+                    page.resource_suffix
+                )
+            },
             &self.shared.style_files,
         );
         self.shared.fs.write(settings_file, v)?;

src/librustdoc/html/render/mod.rs

@@ -334,134 +334,6 @@ impl AllTypes {
     }
 }
 
-#[derive(Debug)]
-enum Setting {
-    Section {
-        description: &'static str,
-        sub_settings: Vec<Setting>,
-    },
-    Toggle {
-        js_data_name: &'static str,
-        description: &'static str,
-        default_value: bool,
-    },
-    Select {
-        js_data_name: &'static str,
-        description: &'static str,
-        default_value: &'static str,
-        options: Vec<String>,
-    },
-}
-
-impl Setting {
-    fn display(&self, root_path: &str, suffix: &str) -> String {
-        match *self {
-            Setting::Section { description, ref sub_settings } => format!(
-                "<div class=\"setting-line\">\
-                     <div class=\"title\">{}</div>\
-                     <div class=\"sub-settings\">{}</div>
-                 </div>",
-                description,
-                sub_settings.iter().map(|s| s.display(root_path, suffix)).collect::<String>()
-            ),
-            Setting::Toggle { js_data_name, description, default_value } => format!(
-                "<div class=\"setting-line\">\
-                     <label class=\"toggle\">\
-                     <input type=\"checkbox\" id=\"{}\" {}>\
-                     <span class=\"slider\"></span>\
-                     </label>\
-                     <div>{}</div>\
-                 </div>",
-                js_data_name,
-                if default_value { " checked" } else { "" },
-                description,
-            ),
-            Setting::Select { js_data_name, description, default_value, ref options } => format!(
-                "<div class=\"setting-line\"><div class=\"radio-line\" id=\"{}\"><span class=\"setting-name\">{}</span><div class=\"choices\">{}</div></div></div>",
-                js_data_name,
-                description,
-                options
-                    .iter()
-                    .map(|opt| format!(
-                        "<label for=\"{js_data_name}-{name}\" class=\"choice\">
-                           <input type=\"radio\" name=\"{js_data_name}\" id=\"{js_data_name}-{name}\" value=\"{name}\" {checked}>\
-                           {name}\
-                         </label>",
-                        js_data_name = js_data_name,
-                        name = opt,
-                        checked = if opt == default_value { "checked" } else { "" },
-                    ))
-                    .collect::<String>(),
-            ),
-        }
-    }
-}
-
-impl From<(&'static str, &'static str, bool)> for Setting {
-    fn from(values: (&'static str, &'static str, bool)) -> Setting {
-        Setting::Toggle { js_data_name: values.0, description: values.1, default_value: values.2 }
-    }
-}
-
-impl<T: Into<Setting>> From<(&'static str, Vec<T>)> for Setting {
-    fn from(values: (&'static str, Vec<T>)) -> Setting {
-        Setting::Section {
-            description: values.0,
-            sub_settings: values.1.into_iter().map(|v| v.into()).collect::<Vec<_>>(),
-        }
-    }
-}
-
-fn settings(root_path: &str, suffix: &str, theme_names: Vec<String>) -> Result<String, Error> {
-    // (id, explanation, default value)
-    let settings: &[Setting] = &[
-        Setting::from(("use-system-theme", "Use system theme", true)),
-        Setting::Select {
-            js_data_name: "theme",
-            description: "Theme",
-            default_value: "light",
-            options: theme_names.clone(),
-        },
-        Setting::Select {
-            js_data_name: "preferred-light-theme",
-            description: "Preferred light theme",
-            default_value: "light",
-            options: theme_names.clone(),
-        },
-        Setting::Select {
-            js_data_name: "preferred-dark-theme",
-            description: "Preferred dark theme",
-            default_value: "dark",
-            options: theme_names,
-        },
-        ("auto-hide-large-items", "Auto-hide item contents for large items.", true).into(),
-        ("auto-hide-method-docs", "Auto-hide item methods' documentation", false).into(),
-        ("auto-hide-trait-implementations", "Auto-hide trait implementation documentation", false)
-            .into(),
-        ("go-to-only-result", "Directly go to item in search if there is only one result", false)
-            .into(),
-        ("line-numbers", "Show line numbers on code examples", false).into(),
-        ("disable-shortcuts", "Disable keyboard shortcuts", false).into(),
-    ];
-
-    Ok(format!(
-        "<div class=\"main-heading\">
-            <h1 class=\"fqn\">\
-                <span class=\"in-band\">Rustdoc settings</span>\
-            </h1>\
-            <span class=\"out-of-band\">\
-            <a id=\"back\" href=\"javascript:void(0)\">Back</a>\
-            </span>\
-        </div>\
-        <div class=\"settings\">{}</div>\
-        <link rel=\"stylesheet\" href=\"{root_path}settings{suffix}.css\">\
-        <script src=\"{root_path}settings{suffix}.js\"></script>",
-        settings.iter().map(|s| s.display(root_path, suffix)).collect::<String>(),
-        root_path = root_path,
-        suffix = suffix
-    ))
-}
-
 fn scrape_examples_help(shared: &SharedContext<'_>) -> String {
     let mut content = SCRAPE_EXAMPLES_HELP_MD.to_owned();
     content.push_str(&format!(