Auto merge of rust-lang#14758 - lumenian:hover-layout-config, r=HKalbasi

Add config for disabling hover memory layout data

Requested in rust-lang/rust-analyzer#14748 (comment)

Author: bors

crates/ide/src/hover.rs

@@ -27,6 +27,7 @@ use crate::{
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct HoverConfig {
     pub links_in_hover: bool,
+    pub memory_layout: bool,
     pub documentation: bool,
     pub keywords: bool,
     pub format: HoverDocFormat,
@@ -226,7 +227,7 @@ fn hover_simple(
                     return None;
                 }
                 let c = token.parent().and_then(|x| x.parent()).and_then(ast::ClosureExpr::cast)?;
-                render::closure_expr(sema, c)
+                render::closure_expr(sema, config, c)
             })
         });
 

crates/ide/src/hover/render.rs

@@ -43,13 +43,17 @@ pub(super) fn type_info_of(
 
 pub(super) fn closure_expr(
     sema: &Semantics<'_, RootDatabase>,
+    config: &HoverConfig,
     c: ast::ClosureExpr,
 ) -> Option<HoverResult> {
     let ty = &sema.type_of_expr(&c.into())?.original;
-    let layout = ty
-        .layout(sema.db)
-        .map(|x| format!(" // size = {}, align = {}", x.size.bytes(), x.align.abi.bytes()))
-        .unwrap_or_default();
+    let layout = if config.memory_layout {
+        ty.layout(sema.db)
+            .map(|x| format!(" // size = {}, align = {}", x.size.bytes(), x.align.abi.bytes()))
+            .unwrap_or_default()
+    } else {
+        String::default()
+    };
     let c = ty.as_closure()?;
     let mut captures = c
         .captured_items(sema.db)
@@ -415,7 +419,7 @@ pub(super) fn definition(
     let mod_path = definition_mod_path(db, &def);
     let (label, docs) = match def {
         Definition::Macro(it) => label_and_docs(db, it),
-        Definition::Field(it) => label_and_layout_info_and_docs(db, it, |&it| {
+        Definition::Field(it) => label_and_layout_info_and_docs(db, it, config, |&it| {
             let var_def = it.parent_def(db);
             let id = it.index();
             let layout = it.layout(db).ok()?;
@@ -435,7 +439,7 @@ pub(super) fn definition(
         }),
         Definition::Module(it) => label_and_docs(db, it),
         Definition::Function(it) => label_and_docs(db, it),
-        Definition::Adt(it) => label_and_layout_info_and_docs(db, it, |&it| {
+        Definition::Adt(it) => label_and_layout_info_and_docs(db, it, config, |&it| {
             let layout = it.layout(db).ok()?;
             Some(format!("size = {}, align = {}", layout.size.bytes(), layout.align.abi.bytes()))
         }),
@@ -473,7 +477,7 @@ pub(super) fn definition(
         }),
         Definition::Trait(it) => label_and_docs(db, it),
         Definition::TraitAlias(it) => label_and_docs(db, it),
-        Definition::TypeAlias(it) => label_and_layout_info_and_docs(db, it, |&it| {
+        Definition::TypeAlias(it) => label_and_layout_info_and_docs(db, it, config, |&it| {
             let layout = it.ty(db).layout(db).ok()?;
             Some(format!("size = {}, align = {}", layout.size.bytes(), layout.align.abi.bytes()))
         }),
@@ -577,17 +581,17 @@ where
 fn label_and_layout_info_and_docs<D, E, V>(
     db: &RootDatabase,
     def: D,
+    config: &HoverConfig,
     value_extractor: E,
 ) -> (String, Option<hir::Documentation>)
 where
     D: HasAttrs + HirDisplay,
     E: Fn(&D) -> Option<V>,
     V: Display,
 {
-    let label = if let Some(value) = value_extractor(&def) {
-        format!("{} // {value}", def.display(db))
-    } else {
-        def.display(db).to_string()
+    let label = match value_extractor(&def) {
+        Some(value) if config.memory_layout => format!("{} // {value}", def.display(db)),
+        _ => def.display(db).to_string(),
     };
     let docs = def.attrs(db).docs();
     (label, docs)

crates/ide/src/hover/tests.rs

@@ -6,6 +6,7 @@ use crate::{fixture, HoverConfig, HoverDocFormat};
 
 const HOVER_BASE_CONFIG: HoverConfig = HoverConfig {
     links_in_hover: false,
+    memory_layout: true,
     documentation: true,
     format: HoverDocFormat::Markdown,
     keywords: true,
@@ -57,6 +58,23 @@ fn check_hover_no_links(ra_fixture: &str, expect: Expect) {
     expect.assert_eq(&actual)
 }
 
+fn check_hover_no_memory_layout(ra_fixture: &str, expect: Expect) {
+    let (analysis, position) = fixture::position(ra_fixture);
+    let hover = analysis
+        .hover(
+            &HoverConfig { memory_layout: false, ..HOVER_BASE_CONFIG },
+            FileRange { file_id: position.file_id, range: TextRange::empty(position.offset) },
+        )
+        .unwrap()
+        .unwrap();
+
+    let content = analysis.db.file_text(position.file_id);
+    let hovered_element = &content[hover.range];
+
+    let actual = format!("*{hovered_element}*\n{}\n", hover.info.markup);
+    expect.assert_eq(&actual)
+}
+
 fn check_hover_no_markdown(ra_fixture: &str, expect: Expect) {
     let (analysis, position) = fixture::position(ra_fixture);
     let hover = analysis
@@ -1745,6 +1763,44 @@ pub fn fo$0o() {}
     );
 }
 
+#[test]
+fn test_hover_no_memory_layout() {
+    check_hover_no_memory_layout(
+        r#"struct Foo { fiel$0d_a: u8, field_b: i32, field_c: i16 }"#,
+        expect![[r#"
+            *field_a*
+
+            ```rust
+            test::Foo
+            ```
+
+            ```rust
+            field_a: u8
+            ```
+        "#]],
+    );
+
+    check_hover_no_memory_layout(
+        r#"
+//- minicore: copy
+fn main() {
+    let x = 2;
+    let y = $0|z| x + z;
+}
+"#,
+        expect![[r#"
+            *|*
+            ```rust
+            {closure#0}
+            impl Fn(i32) -> i32
+            ```
+
+            ## Captures
+            * `x` by immutable borrow
+        "#]],
+    );
+}
+
 #[test]
 fn test_hover_macro_generated_struct_fn_doc_comment() {
     cov_mark::check!(hover_macro_generated_struct_fn_doc_comment);

crates/ide/src/static_index.rs

@@ -137,6 +137,7 @@ impl StaticIndex<'_> {
         });
         let hover_config = HoverConfig {
             links_in_hover: true,
+            memory_layout: true,
             documentation: true,
             keywords: true,
             format: crate::HoverDocFormat::Markdown,

crates/rust-analyzer/src/config.rs

@@ -313,8 +313,10 @@ config_data! {
         /// Whether to show keyword hover popups. Only applies when
         /// `#rust-analyzer.hover.documentation.enable#` is set.
         hover_documentation_keywords_enable: bool  = "true",
-        /// Use markdown syntax for links in hover.
+        /// Use markdown syntax for links on hover.
         hover_links_enable: bool = "true",
+        /// Whether to show memory layout data on hover.
+        hover_memoryLayout_enable: bool = "true",
 
         /// Whether to enforce the import granularity setting for all files. If set to false rust-analyzer will try to keep import styles consistent per file.
         imports_granularity_enforce: bool              = "false",
@@ -1472,6 +1474,7 @@ impl Config {
     pub fn hover(&self) -> HoverConfig {
         HoverConfig {
             links_in_hover: self.data.hover_links_enable,
+            memory_layout: self.data.hover_memoryLayout_enable,
             documentation: self.data.hover_documentation_enable,
             format: {
                 let is_markdown = try_or_def!(self

docs/user/generated_config.adoc

@@ -421,7 +421,12 @@ Whether to show keyword hover popups. Only applies when
 [[rust-analyzer.hover.links.enable]]rust-analyzer.hover.links.enable (default: `true`)::
 +
 --
-Use markdown syntax for links in hover.
+Use markdown syntax for links on hover.
+--
+[[rust-analyzer.hover.memoryLayout.enable]]rust-analyzer.hover.memoryLayout.enable (default: `true`)::
++
+--
+Whether to show memory layout data on hover.
 --
 [[rust-analyzer.imports.granularity.enforce]]rust-analyzer.imports.granularity.enforce (default: `false`)::
 +

editors/code/package.json

@@ -955,7 +955,12 @@
                     "type": "boolean"
                 },
                 "rust-analyzer.hover.links.enable": {
-                    "markdownDescription": "Use markdown syntax for links in hover.",
+                    "markdownDescription": "Use markdown syntax for links on hover.",
+                    "default": true,
+                    "type": "boolean"
+                },
+                "rust-analyzer.hover.memoryLayout.enable": {
+                    "markdownDescription": "Whether to show memory layout data on hover.",
                     "default": true,
                     "type": "boolean"
                 },