Rollup merge of #91062 - jsha:static-file-replace, r=jyn514,GuillaumeGomez

rustdoc: Consolidate static-file replacement mechanism

There were a few places in rustdoc where we would take static JS or CSS and rewrite it at doc generation time to insert values. This consolidates all the CSS instances into one CSS file and replaces the JS examples with data- attributes on the rustdoc-vars div.

Demo https://rustdoc.crud.net/jsha/static-file-replace/test_docs/

r? ``@GuillaumeGomez``

src/librustdoc/html/render/mod.rs

@@ -64,7 +64,6 @@ use serde::ser::SerializeSeq;
 use serde::{Serialize, Serializer};
 
 use crate::clean::{self, ItemId, RenderedLink, SelfTy};
-use crate::docfs::PathError;
 use crate::error::Error;
 use crate::formats::cache::Cache;
 use crate::formats::item_type::ItemType;
@@ -173,8 +172,12 @@ impl Serialize for TypeWithKind {
 crate struct StylePath {
     /// The path to the theme
     crate path: PathBuf,
-    /// What the `disabled` attribute should be set to in the HTML tag
-    crate disabled: bool,
+}
+
+impl StylePath {
+    pub fn basename(&self) -> Result<String, Error> {
+        Ok(try_none!(try_none!(self.path.file_stem(), &self.path).to_str(), &self.path).to_string())
+    }
 }
 
 fn write_srclink(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer) {
@@ -353,7 +356,7 @@ enum Setting {
         js_data_name: &'static str,
         description: &'static str,
         default_value: &'static str,
-        options: Vec<(String, String)>,
+        options: Vec<String>,
     },
 }
 
@@ -393,10 +396,9 @@ impl Setting {
                 options
                     .iter()
                     .map(|opt| format!(
-                        "<option value=\"{}\" {}>{}</option>",
-                        opt.0,
-                        if opt.0 == default_value { "selected" } else { "" },
-                        opt.1,
+                        "<option value=\"{name}\" {}>{name}</option>",
+                        if opt == default_value { "selected" } else { "" },
+                        name = opt,
                     ))
                     .collect::<String>(),
                 root_path,
@@ -421,18 +423,7 @@ impl<T: Into<Setting>> From<(&'static str, Vec<T>)> for Setting {
     }
 }
 
-fn settings(root_path: &str, suffix: &str, themes: &[StylePath]) -> Result<String, Error> {
-    let theme_names: Vec<(String, String)> = themes
-        .iter()
-        .map(|entry| {
-            let theme =
-                try_none!(try_none!(entry.path.file_stem(), &entry.path).to_str(), &entry.path)
-                    .to_string();
-
-            Ok((theme.clone(), theme))
-        })
-        .collect::<Result<_, Error>>()?;
-
+fn settings(root_path: &str, suffix: &str, theme_names: Vec<String>) -> Result<String, Error> {
     // (id, explanation, default value)
     let settings: &[Setting] = &[
         (
@@ -469,10 +460,11 @@ fn settings(root_path: &str, suffix: &str, themes: &[StylePath]) -> Result<Strin
             <span class=\"in-band\">Rustdoc settings</span>\
         </h1>\
         <div class=\"settings\">{}</div>\
-        <script src=\"{}settings{}.js\"></script>",
+        <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,
-        suffix
+        root_path = root_path,
+        suffix = suffix
     ))
 }