move more code to presentation

crates/ra_ide_api/src/completion/completion_item.rs

@@ -1,13 +1,11 @@
 use std::fmt;
 
-use hir::{Docs, Documentation, PerNs, Resolution};
+use hir::{Docs, Documentation};
 use ra_syntax::TextRange;
 use ra_text_edit::{ TextEditBuilder, TextEdit};
-use test_utils::tested_by;
 
 use crate::completion::{
     completion_context::CompletionContext,
-    function_label,
     const_label,
     type_label
 };
@@ -255,70 +253,6 @@ impl Builder {
         self.documentation = docs.map(Into::into);
         self
     }
-    pub(super) fn from_resolution(
-        mut self,
-        ctx: &CompletionContext,
-        resolution: &PerNs<Resolution>,
-    ) -> Builder {
-        use hir::ModuleDef::*;
-
-        let def = resolution.as_ref().take_types().or_else(|| resolution.as_ref().take_values());
-        let def = match def {
-            None => return self,
-            Some(it) => it,
-        };
-        let (kind, docs) = match def {
-            Resolution::Def(Module(it)) => (CompletionItemKind::Module, it.docs(ctx.db)),
-            Resolution::Def(Function(func)) => return self.from_function(ctx, *func),
-            Resolution::Def(Struct(it)) => (CompletionItemKind::Struct, it.docs(ctx.db)),
-            Resolution::Def(Enum(it)) => (CompletionItemKind::Enum, it.docs(ctx.db)),
-            Resolution::Def(EnumVariant(it)) => (CompletionItemKind::EnumVariant, it.docs(ctx.db)),
-            Resolution::Def(Const(it)) => (CompletionItemKind::Const, it.docs(ctx.db)),
-            Resolution::Def(Static(it)) => (CompletionItemKind::Static, it.docs(ctx.db)),
-            Resolution::Def(Trait(it)) => (CompletionItemKind::Trait, it.docs(ctx.db)),
-            Resolution::Def(Type(it)) => (CompletionItemKind::TypeAlias, it.docs(ctx.db)),
-            Resolution::GenericParam(..) => (CompletionItemKind::TypeParam, None),
-            Resolution::LocalBinding(..) => (CompletionItemKind::Binding, None),
-            Resolution::SelfType(..) => (
-                CompletionItemKind::TypeParam, // (does this need its own kind?)
-                None,
-            ),
-        };
-        self.kind = Some(kind);
-        self.documentation = docs;
-
-        self
-    }
-
-    pub(super) fn from_function(
-        mut self,
-        ctx: &CompletionContext,
-        function: hir::Function,
-    ) -> Builder {
-        // If not an import, add parenthesis automatically.
-        if ctx.use_item_syntax.is_none() && !ctx.is_call {
-            tested_by!(inserts_parens_for_function_calls);
-            let sig = function.signature(ctx.db);
-            if sig.params().is_empty() || sig.has_self_param() && sig.params().len() == 1 {
-                self.insert_text = Some(format!("{}()$0", self.label));
-            } else {
-                self.insert_text = Some(format!("{}($0)", self.label));
-            }
-            self.insert_text_format = InsertTextFormat::Snippet;
-        }
-
-        if let Some(docs) = function.docs(ctx.db) {
-            self.documentation = Some(docs);
-        }
-
-        if let Some(label) = function_item_label(ctx, function) {
-            self.detail = Some(label);
-        }
-
-        self.kind = Some(CompletionItemKind::Function);
-        self
-    }
-
     pub(super) fn from_const(mut self, ctx: &CompletionContext, ct: hir::Const) -> Builder {
         if let Some(docs) = ct.docs(ctx.db) {
             self.documentation = Some(docs);
@@ -373,11 +307,6 @@ impl Into<Vec<CompletionItem>> for Completions {
     }
 }
 
-fn function_item_label(ctx: &CompletionContext, function: hir::Function) -> Option<String> {
-    let node = function.source(ctx.db).1;
-    function_label(&node)
-}
-
 fn const_item_label(ctx: &CompletionContext, ct: hir::Const) -> String {
     let node = ct.source(ctx.db).1;
     const_label(&node)

crates/ra_ide_api/src/completion/presentation.rs

@@ -38,21 +38,61 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         local_name: String,
-        res: &PerNs<Resolution>,
+        resolution: &PerNs<Resolution>,
     ) {
+        use hir::ModuleDef::*;
+
+        let def = resolution.as_ref().take_types().or_else(|| resolution.as_ref().take_values());
+        let def = match def {
+            None => {
+                self.add(CompletionItem::new(
+                    CompletionKind::Reference,
+                    ctx.source_range(),
+                    local_name,
+                ));
+                return;
+            }
+            Some(it) => it,
+        };
+        let (kind, docs) = match def {
+            Resolution::Def(Module(it)) => (CompletionItemKind::Module, it.docs(ctx.db)),
+            Resolution::Def(Function(func)) => {
+                return self.add_function_with_name(ctx, Some(local_name), *func);
+            }
+            Resolution::Def(Struct(it)) => (CompletionItemKind::Struct, it.docs(ctx.db)),
+            Resolution::Def(Enum(it)) => (CompletionItemKind::Enum, it.docs(ctx.db)),
+            Resolution::Def(EnumVariant(it)) => (CompletionItemKind::EnumVariant, it.docs(ctx.db)),
+            Resolution::Def(Const(it)) => (CompletionItemKind::Const, it.docs(ctx.db)),
+            Resolution::Def(Static(it)) => (CompletionItemKind::Static, it.docs(ctx.db)),
+            Resolution::Def(Trait(it)) => (CompletionItemKind::Trait, it.docs(ctx.db)),
+            Resolution::Def(Type(it)) => (CompletionItemKind::TypeAlias, it.docs(ctx.db)),
+            Resolution::GenericParam(..) => (CompletionItemKind::TypeParam, None),
+            Resolution::LocalBinding(..) => (CompletionItemKind::Binding, None),
+            Resolution::SelfType(..) => (
+                CompletionItemKind::TypeParam, // (does this need its own kind?)
+                None,
+            ),
+        };
         CompletionItem::new(CompletionKind::Reference, ctx.source_range(), local_name)
-            .from_resolution(ctx, res)
+            .kind(kind)
-            .add_to(self);
+            .set_documentation(docs)
+            .add_to(self)
     }
 
     pub(crate) fn add_function(&mut self, ctx: &CompletionContext, func: hir::Function) {
-        let sig = func.signature(ctx.db);
+        self.add_function_with_name(ctx, None, func)
+    }
 
-        let mut builder = CompletionItem::new(
+    fn add_function_with_name(
-            CompletionKind::Reference,
+        &mut self,
-            ctx.source_range(),
+        ctx: &CompletionContext,
-            sig.name().to_string(),
+        name: Option<String>,
-        )
+        func: hir::Function,
+    ) {
+        let sig = func.signature(ctx.db);
+        let name = name.unwrap_or_else(|| sig.name().to_string());
+
+        let mut builder = CompletionItem::new(CompletionKind::Reference, ctx.source_range(), name)
             .kind(if sig.has_self_param() {
                 CompletionItemKind::Method
             } else {