From 23ffda1a97726ccdb70e43910ae4363f3e5b8448 Mon Sep 17 00:00:00 2001
From: vxpm <viniciusximenespm@gmail.com>
Date: Sun, 3 Sep 2023 22:42:56 -0300
Subject: [PATCH] full function signatures option

---
 crates/ide-completion/src/config.rs          | 1 +
 crates/ide-completion/src/render/function.rs | 8 ++++++--
 crates/rust-analyzer/src/config.rs           | 3 +++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/crates/ide-completion/src/config.rs b/crates/ide-completion/src/config.rs
index 8f6a97e1e09..3d025f284bb 100644
--- a/crates/ide-completion/src/config.rs
+++ b/crates/ide-completion/src/config.rs
@@ -14,6 +14,7 @@ pub struct CompletionConfig {
     pub enable_imports_on_the_fly: bool,
     pub enable_self_on_the_fly: bool,
     pub enable_private_editable: bool,
+    pub full_function_signatures: bool,
     pub callable: Option<CallableSnippets>,
     pub snippet_cap: Option<SnippetCap>,
     pub insert_use: InsertUseConfig,
diff --git a/crates/ide-completion/src/render/function.rs b/crates/ide-completion/src/render/function.rs
index 8afce8db5ea..1672826f330 100644
--- a/crates/ide-completion/src/render/function.rs
+++ b/crates/ide-completion/src/render/function.rs
@@ -100,7 +100,7 @@ fn render(
 
     item.set_documentation(ctx.docs(func))
         .set_deprecated(ctx.is_deprecated(func) || ctx.is_deprecated_assoc_item(func))
-        .detail(detail(db, func))
+        .detail(detail(db, func, ctx.completion.config.full_function_signatures))
         .lookup_by(name.unescaped().to_smol_str());
 
     match ctx.completion.config.snippet_cap {
@@ -239,7 +239,11 @@ fn ref_of_param(ctx: &CompletionContext<'_>, arg: &str, ty: &hir::Type) -> &'sta
     ""
 }
 
-fn detail(db: &dyn HirDatabase, func: hir::Function) -> String {
+fn detail(db: &dyn HirDatabase, func: hir::Function, full_function_signature: bool) -> String {
+    if full_function_signature {
+        return format!("{}", func.display(db)).replace("\n", " ");
+    }
+
     let mut ret_ty = func.ret_type(db);
     let mut detail = String::new();
 
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index ea3a21241cb..07c6457b9c7 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -215,6 +215,8 @@ struct ConfigData {
         completion_postfix_enable: bool         = "true",
         /// Enables completions of private items and fields that are defined in the current workspace even if they are not visible at the current position.
         completion_privateEditable_enable: bool = "false",
+        /// Whether to show full function/method signatures in completion docs.
+        completion_fullFunctionSignatures_enable: bool = "false",
         /// Custom completion snippets.
         // NOTE: Keep this list in sync with the feature docs of user snippets.
         completion_snippets_custom: FxHashMap<String, SnippetDef> = r#"{
@@ -1444,6 +1446,7 @@ pub fn completion(&self) -> CompletionConfig {
                 && completion_item_edit_resolve(&self.caps),
             enable_self_on_the_fly: self.data.completion_autoself_enable,
             enable_private_editable: self.data.completion_privateEditable_enable,
+            full_function_signatures: self.data.completion_fullFunctionSignatures_enable,
             callable: match self.data.completion_callable_snippets {
                 CallableCompletionDef::FillArguments => Some(CallableSnippets::FillArguments),
                 CallableCompletionDef::AddParentheses => Some(CallableSnippets::AddParentheses),