add HoverDisplayConfig

crates/hir/src/display.rs

@@ -17,7 +17,10 @@ use hir_ty::{
 };
 
 use crate::{
-    Adt, AsAssocItem, AssocItem, AssocItemContainer, Const, ConstParam, Enum, ExternCrateDecl, Field, Function, GenericParam, HasCrate, HasVisibility, LifetimeParam, Macro, Module, SelfParam, Static, Struct, Trait, TraitAlias, TupleField, TyBuilder, Type, TypeAlias, TypeOrConstParam, TypeParam, Union, Variant
+    Adt, AsAssocItem, AssocItem, AssocItemContainer, Const, ConstParam, Enum, ExternCrateDecl,
+    Field, Function, GenericParam, HasCrate, HasVisibility, LifetimeParam, Macro, Module,
+    SelfParam, Static, Struct, Trait, TraitAlias, TupleField, TyBuilder, Type, TypeAlias,
+    TypeOrConstParam, TypeParam, Union, Variant,
 };
 
 impl HirDisplay for Function {
@@ -593,9 +596,9 @@ impl HirDisplay for Trait {
         write_generic_params(def_id, f)?;
         write_where_clause(def_id, f)?;
 
-        let mut display_size = 0;
-        let max_display_size = f.max_size.unwrap_or(7);
         let assoc_items = self.items(f.db);
+        let assoc_items_size = assoc_items.len();
+        let max_display_size = f.max_size.unwrap_or(assoc_items_size);
         if assoc_items.is_empty() {
             f.write_str(" {}")?;
         } else {
@@ -614,8 +617,7 @@ impl HirDisplay for Trait {
                     }
                 };
                 f.write_str(",\n")?;
-                display_size += 1;
+                if index + 1 == max_display_size && index + 1 != assoc_items_size {
-                if display_size == max_display_size && index != assoc_items.len() - 1{
                     f.write_str("    ...\n")?;
                     break;
                 }

crates/ide-db/src/defs.rs

@@ -24,6 +24,12 @@ use crate::documentation::{Documentation, HasDocs};
 use crate::famous_defs::FamousDefs;
 use crate::RootDatabase;
 
+#[derive(Default)]
+pub struct HoverDisplayConfig {
+    pub trait_item_display_num: Option<usize>,
+    // todo: add config for struct & enum
+}
+
 // FIXME: a more precise name would probably be `Symbol`?
 #[derive(Debug, PartialEq, Eq, Copy, Clone, Hash)]
 pub enum Definition {
@@ -213,7 +219,7 @@ impl Definition {
         })
     }
 
-    pub fn label(&self, db: &RootDatabase, max_size: Option<usize>) -> String {
+    pub fn label(&self, db: &RootDatabase, hover_display_config: HoverDisplayConfig) -> String {
         match *self {
             Definition::Macro(it) => it.display(db).to_string(),
             Definition::Field(it) => it.display(db).to_string(),
@@ -224,7 +230,9 @@ impl Definition {
             Definition::Variant(it) => it.display(db).to_string(),
             Definition::Const(it) => it.display(db).to_string(),
             Definition::Static(it) => it.display(db).to_string(),
-            Definition::Trait(it) => it.display_truncated(db, max_size).to_string(),
+            Definition::Trait(it) => {
+                it.display_truncated(db, hover_display_config.trait_item_display_num).to_string()
+            }
             Definition::TraitAlias(it) => it.display(db).to_string(),
             Definition::TypeAlias(it) => it.display(db).to_string(),
             Definition::BuiltinType(it) => it.name().display(db).to_string(),

crates/ide/src/hover.rs

@@ -32,7 +32,7 @@ pub struct HoverConfig {
     pub documentation: bool,
     pub keywords: bool,
     pub format: HoverDocFormat,
-    pub trait_item_display_on_hover: Option<usize>,
+    pub trait_item_display_num: Option<usize>,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]

crates/ide/src/hover/render.rs

@@ -8,7 +8,7 @@ use hir::{
 };
 use ide_db::{
     base_db::SourceDatabase,
-    defs::Definition,
+    defs::{Definition, HoverDisplayConfig},
     documentation::HasDocs,
     famous_defs::FamousDefs,
     generated::lints::{CLIPPY_LINTS, DEFAULT_LINTS, FEATURES},
@@ -406,7 +406,8 @@ pub(super) fn definition(
     config: &HoverConfig,
 ) -> Markup {
     let mod_path = definition_mod_path(db, &def);
-    let label = def.label(db, config.trait_item_display_on_hover);
+    let hover_config = HoverDisplayConfig { trait_item_display_num: config.trait_item_display_num };
+    let label = def.label(db, hover_config);
     let docs = def.docs(db, famous_defs);
     let value = (|| match def {
         Definition::Variant(it) => {

crates/ide/src/hover/tests.rs

@@ -17,7 +17,7 @@ const HOVER_BASE_CONFIG: HoverConfig = HoverConfig {
     documentation: true,
     format: HoverDocFormat::Markdown,
     keywords: true,
-    trait_item_display_on_hover: Some(7),
+    trait_item_display_num: Some(7),
 };
 
 fn check_hover_no_result(ra_fixture: &str) {

crates/ide/src/static_index.rs

@@ -4,7 +4,7 @@
 use hir::{db::HirDatabase, Crate, HirFileIdExt, Module, Semantics};
 use ide_db::{
     base_db::{FileId, FileRange, SourceDatabaseExt},
-    defs::Definition,
+    defs::{Definition, HoverDisplayConfig},
     documentation::Documentation,
     famous_defs::FamousDefs,
     helpers::get_definition,
@@ -166,7 +166,7 @@ impl StaticIndex<'_> {
             documentation: true,
             keywords: true,
             format: crate::HoverDocFormat::Markdown,
-            trait_item_display_on_hover: Some(7)
+            trait_item_display_num: None,
         };
         let tokens = tokens.filter(|token| {
             matches!(
@@ -197,7 +197,7 @@ impl StaticIndex<'_> {
                     enclosing_moniker: current_crate
                         .zip(def.enclosing_definition(self.db))
                         .and_then(|(cc, enclosing_def)| def_to_moniker(self.db, enclosing_def, cc)),
-                    signature: Some(def.label(self.db, hover_config.trait_item_display_on_hover)),
+                    signature: Some(def.label(self.db, HoverDisplayConfig::default())),
                     kind: def_to_kind(self.db, def),
                 });
                 self.def_map.insert(def, it);

crates/rust-analyzer/src/config.rs

@@ -591,7 +591,7 @@ config_data! {
         signatureInfo_documentation_enable: bool                       = "true",
 
         /// How many trait item display on hover.
-        trait_item_display_on_hover: Option<usize> = "7",
+        traitItemDisplayNum: Option<usize> = "7",
 
         /// Whether to insert closing angle brackets when typing an opening angle bracket of a generic argument list.
         typing_autoClosingAngleBrackets_enable: bool = "false",
@@ -1685,7 +1685,7 @@ impl Config {
                 }
             },
             keywords: self.data.hover_documentation_keywords_enable,
-            trait_item_display_on_hover: self.data.trait_item_display_on_hover,
+            trait_item_display_num: self.data.traitItemDisplayNum,
         }
     }
 

docs/user/generated_config.adoc

@@ -927,7 +927,7 @@ Show full signature of the callable. Only shows parameters if disabled.
 --
 Show documentation.
 --
-[[rust-analyzer.trait.item.display.on.hover]]rust-analyzer.trait.item.display.on.hover (default: `7`)::
+[[rust-analyzer.traitItemDisplayNum]]rust-analyzer.traitItemDisplayNum (default: `7`)::
 +
 --
 How many trait item display on hover.

editors/code/package.json

@@ -1648,7 +1648,7 @@
                     "default": true,
                     "type": "boolean"
                 },
-                "rust-analyzer.trait.item.display.on.hover": {
+                "rust-analyzer.traitItemDisplayNum": {
                     "markdownDescription": "How many trait item display on hover.",
                     "default": 7,
                     "type": [