Auto merge of #92526 - djc:rustdoc-askama, r=jsha

Migrate rustdoc from Tera to Askama

See #84419.

Should probably get a benchmarking run to verify if it has the intended effect on rustdoc performance.

cc `@jsha` `@jyn514.`

Author: bors

Diff for: Cargo.lock

@@ -103,6 +103,47 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a2f58b0bb10c380af2b26e57212856b8c9a59e0925b4c20f4a174a49734eaf7"
 
+[[package]]
+name = "askama"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d8f355701c672c2ba3d718acbd213f740beea577cc4eae66accdffe15be1882"
+dependencies = [
+ "askama_derive",
+ "askama_escape",
+ "askama_shared",
+]
+
+[[package]]
+name = "askama_derive"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84704cab5b7ae0fd3a9f78ee5eb7b27f3749df445f04623db6633459ae283267"
+dependencies = [
+ "askama_shared",
+ "proc-macro2",
+ "syn",
+]
+
+[[package]]
+name = "askama_escape"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a1bb320f97e6edf9f756bf015900038e43c7700e059688e5724a928c8f3b8d5"
+
+[[package]]
+name = "askama_shared"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dae03eebba55a2697a376e58b573a29fe36893157173ac8df312ad85f3c0e012"
+dependencies = [
+ "askama_escape",
+ "nom",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -1509,17 +1550,6 @@ dependencies = [
  "regex",
 ]
 
-[[package]]
-name = "globwalk"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93e3af942408868f6934a7b85134a3230832b9977cf66125df2f9edcfce4ddcc"
-dependencies = [
- "bitflags",
- "ignore",
- "walkdir",
-]
-
 [[package]]
 name = "gsgdt"
 version = "0.1.2"
@@ -2245,6 +2275,12 @@ dependencies = [
  "macro-utils",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.0"
@@ -2304,6 +2340,17 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e4a24736216ec316047a1fc4252e27dabb04218aa4a3f37c6e7ddbf1f9782b54"
 
+[[package]]
+name = "nom"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+ "version_check",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.3.6"
@@ -4631,6 +4678,7 @@ name = "rustdoc"
 version = "0.0.0"
 dependencies = [
  "arrayvec",
+ "askama",
  "expect-test",
  "itertools 0.9.0",
  "minifier",
@@ -4642,7 +4690,6 @@ dependencies = [
  "serde_json",
  "smallvec",
  "tempfile",
- "tera",
  "tracing",
  "tracing-subscriber",
  "tracing-tree",
@@ -5187,21 +5234,6 @@ dependencies = [
  "utf-8",
 ]
 
-[[package]]
-name = "tera"
-version = "1.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81060acb882480c8793782eb96bc86f5c83d2fc7175ad46c375c6956ef7afa62"
-dependencies = [
- "globwalk",
- "lazy_static",
- "pest",
- "pest_derive",
- "regex",
- "serde",
- "serde_json",
-]
-
 [[package]]
 name = "term"
 version = "0.6.1"

Diff for: src/librustdoc/Cargo.toml

@@ -8,6 +8,7 @@ path = "lib.rs"
 
 [dependencies]
 arrayvec = { version = "0.7", default-features = false }
+askama = { version = "0.11", default-features = false }
 pulldown-cmark = { version = "0.9", default-features = false }
 minifier = "0.0.41"
 rayon = "1.3.1"
@@ -20,7 +21,6 @@ regex = "1"
 rustdoc-json-types = { path = "../rustdoc-json-types" }
 tracing = "0.1"
 tracing-tree = "0.2.0"
-tera = { version = "1.10.0", default-features = false }
 
 [dependencies.tracing-subscriber]
 version = "0.3.3"

Diff for: src/librustdoc/config.rs

@@ -257,9 +257,6 @@ crate struct RenderOptions {
     /// If present, playground URL to use in the "Run" button added to code samples generated from
     /// standalone Markdown files. If not present, `playground_url` is used.
     crate markdown_playground_url: Option<String>,
-    /// If false, the `select` element to have search filtering by crates on rendered docs
-    /// won't be generated.
-    crate generate_search_filter: bool,
     /// Document items that have lower than `pub` visibility.
     crate document_private: bool,
     /// Document items that have `doc(hidden)`.
@@ -638,7 +635,6 @@ impl Options {
         let crate_version = matches.opt_str("crate-version");
         let enable_index_page = matches.opt_present("enable-index-page") || index_page.is_some();
         let static_root_path = matches.opt_str("static-root-path");
-        let generate_search_filter = !matches.opt_present("disable-per-crate-search");
         let test_run_directory = matches.opt_str("test-run-directory").map(PathBuf::from);
         let persist_doctests = matches.opt_str("persist-doctests").map(PathBuf::from);
         let test_builder = matches.opt_str("test-builder").map(PathBuf::from);
@@ -724,7 +720,6 @@ impl Options {
                 markdown_no_toc,
                 markdown_css,
                 markdown_playground_url,
-                generate_search_filter,
                 document_private,
                 document_hidden,
                 generate_redirect_map,

Diff for: src/librustdoc/html/layout.rs

@@ -7,9 +7,9 @@ use crate::externalfiles::ExternalHtml;
 use crate::html::format::{Buffer, Print};
 use crate::html::render::{ensure_trailing_slash, StylePath};
 
-use serde::Serialize;
+use askama::Template;
 
-#[derive(Clone, Serialize)]
+#[derive(Clone)]
 crate struct Layout {
     crate logo: String,
     crate favicon: String,
@@ -19,14 +19,10 @@ crate struct Layout {
     /// The given user css file which allow to customize the generated
     /// documentation theme.
     crate css_file_extension: Option<PathBuf>,
-    /// If false, the `select` element to have search filtering by crates on rendered docs
-    /// won't be generated.
-    crate generate_search_filter: bool,
     /// If true, then scrape-examples.js will be included in the output HTML file
     crate scrape_examples_extension: bool,
 }
 
-#[derive(Serialize)]
 crate struct Page<'a> {
     crate title: &'a str,
     crate css_class: &'a str,
@@ -45,7 +41,8 @@ impl<'a> Page<'a> {
     }
 }
 
-#[derive(Serialize)]
+#[derive(Template)]
+#[template(path = "page.html")]
 struct PageLayout<'a> {
     static_root_path: &'a str,
     page: &'a Page<'a>,
@@ -58,7 +55,6 @@ struct PageLayout<'a> {
 }
 
 crate fn render<T: Print, S: Print>(
-    templates: &tera::Tera,
     layout: &Layout,
     page: &Page<'_>,
     sidebar: S,
@@ -76,7 +72,7 @@ crate fn render<T: Print, S: Print>(
     let rustdoc_version = rustc_interface::util::version_str().unwrap_or("unknown version");
     let content = Buffer::html().to_display(t); // Note: This must happen before making the sidebar.
     let sidebar = Buffer::html().to_display(sidebar);
-    let teractx = tera::Context::from_serialize(PageLayout {
+    PageLayout {
         static_root_path,
         page,
         layout,
@@ -85,9 +81,9 @@ crate fn render<T: Print, S: Print>(
         content,
         krate_with_trailing_slash,
         rustdoc_version,
-    })
-    .unwrap();
-    templates.render("page.html", &teractx).unwrap()
+    }
+    .render()
+    .unwrap()
 }
 
 crate fn redirect(url: &str) -> String {

Diff for: src/librustdoc/html/render/context.rs

@@ -15,7 +15,6 @@ use rustc_span::symbol::sym;
 
 use super::print_item::{full_path, item_path, print_item};
 use super::search_index::build_index;
-use super::templates;
 use super::write_shared::write_shared;
 use super::{
     collect_spans_and_sources, print_sidebar, settings, AllTypes, LinkFromSrc, NameDoc, StylePath,
@@ -118,8 +117,6 @@ crate struct SharedContext<'tcx> {
     /// the crate.
     redirections: Option<RefCell<FxHashMap<String, String>>>,
 
-    pub(crate) templates: tera::Tera,
-
     /// Correspondance map used to link types used in the source code pages to allow to click on
     /// links to jump to the type's definition.
     crate span_correspondance_map: FxHashMap<rustc_span::Span, LinkFromSrc>,
@@ -218,11 +215,10 @@ impl<'tcx> Context<'tcx> {
 
         if !self.render_redirect_pages {
             layout::render(
-                &self.shared.templates,
                 &self.shared.layout,
                 &page,
                 |buf: &mut _| print_sidebar(self, it, buf),
-                |buf: &mut _| print_item(self, &self.shared.templates, it, buf, &page),
+                |buf: &mut _| print_item(self, it, buf, &page),
                 &self.shared.style_files,
             )
         } else {
@@ -391,7 +387,6 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             extension_css,
             resource_suffix,
             static_root_path,
-            generate_search_filter,
             unstable_features,
             generate_redirect_map,
             show_type_layout,
@@ -421,12 +416,10 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             default_settings,
             krate: krate.name(tcx).to_string(),
             css_file_extension: extension_css,
-            generate_search_filter,
             scrape_examples_extension: !call_locations.is_empty(),
         };
         let mut issue_tracker_base_url = None;
         let mut include_sources = true;
-        let templates = templates::load()?;
 
         // Crawl the crate attributes looking for attributes which control how we're
         // going to emit HTML
@@ -481,7 +474,6 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             errors: receiver,
             redirections: if generate_redirect_map { Some(Default::default()) } else { None },
             show_type_layout,
-            templates,
             span_correspondance_map: matches,
             cache,
             call_locations,
@@ -577,7 +569,6 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
         };
         let all = self.shared.all.replace(AllTypes::new());
         let v = layout::render(
-            &self.shared.templates,
             &self.shared.layout,
             &page,
             sidebar,
@@ -599,7 +590,6 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             .map(StylePath::basename)
             .collect::<Result<_, Error>>()?;
         let v = layout::render(
-            &self.shared.templates,
             &self.shared.layout,
             &page,
             sidebar,

Diff for: src/librustdoc/html/render/mod.rs

@@ -31,7 +31,6 @@ mod tests;
 mod context;
 mod print_item;
 mod span_map;
-mod templates;
 mod write_shared;
 
 crate use self::context::*;

Diff for: src/librustdoc/html/render/print_item.rs

@@ -32,21 +32,21 @@ use crate::html::highlight;
 use crate::html::layout::Page;
 use crate::html::markdown::{HeadingOffset, MarkdownSummaryLine};
 
-use serde::Serialize;
+use askama::Template;
 
 const ITEM_TABLE_OPEN: &str = "<div class=\"item-table\">";
 const ITEM_TABLE_CLOSE: &str = "</div>";
 const ITEM_TABLE_ROW_OPEN: &str = "<div class=\"item-row\">";
 const ITEM_TABLE_ROW_CLOSE: &str = "</div>";
 
 // A component in a `use` path, like `string` in std::string::ToString
-#[derive(Serialize)]
 struct PathComponent<'a> {
     path: String,
     name: &'a str,
 }
 
-#[derive(Serialize)]
+#[derive(Template)]
+#[template(path = "print_item.html")]
 struct ItemVars<'a> {
     page: &'a Page<'a>,
     static_root_path: &'a str,
@@ -58,13 +58,7 @@ struct ItemVars<'a> {
     src_href: Option<&'a str>,
 }
 
-pub(super) fn print_item(
-    cx: &Context<'_>,
-    templates: &tera::Tera,
-    item: &clean::Item,
-    buf: &mut Buffer,
-    page: &Page<'_>,
-) {
+pub(super) fn print_item(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer, page: &Page<'_>) {
     debug_assert!(!item.is_stripped());
     let typ = match *item.kind {
         clean::ModuleItem(_) => {
@@ -143,8 +137,7 @@ pub(super) fn print_item(
         src_href: src_href.as_deref(),
     };
 
-    let teractx = tera::Context::from_serialize(item_vars).unwrap();
-    let heading = templates.render("print_item.html", &teractx).unwrap();
+    let heading = item_vars.render().unwrap();
     buf.write_str(&heading);
 
     match *item.kind {