introduce completion presentation

This module should remove completion rendering boilerplate from the
"brains" of completion engine.

3 files changed, 40 insertions, 32 deletions

diff --git a/crates/ra_ide_api/src/completion/complete_dot.rs b/crates/ra_ide_api/src/completion/complete_dot.rs
index 20fa323ce..c9099bcd7 100644
--- a/crates/ra_ide_api/src/completion/complete_dot.rs
+++ b/crates/ra_ide_api/src/completion/complete_dot.rs
@@ -1,7 +1,6 @@
-use hir::{Ty, AdtDef, Docs};
+use hir::{Ty, AdtDef};
 
-use crate::completion::{CompletionContext, Completions, CompletionItem, CompletionItemKind};
-use crate::completion::completion_item::CompletionKind;
+use crate::completion::{CompletionContext, Completions, CompletionItem, CompletionItemKind, CompletionKind};
 
 /// Complete dot accesses, i.e. fields or methods (currently only fields).
 pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
@@ -29,15 +28,7 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty)
                 match def_id {
                     AdtDef::Struct(s) => {
                         for field in s.fields(ctx.db) {
-                            CompletionItem::new(
-                                CompletionKind::Reference,
-                                ctx.source_range(),
-                                field.name(ctx.db).to_string(),
-                            )
-                            .kind(CompletionItemKind::Field)
-                            .detail(field.ty(ctx.db).subst(substs).to_string())
-                            .set_documentation(field.docs(ctx.db))
-                            .add_to(acc);
+                            acc.add_field(CompletionKind::Reference, ctx, field, substs);
                         }
                     }
 
@@ -47,14 +38,7 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty)
             }
             Ty::Tuple(fields) => {
                 for (i, ty) in fields.iter().enumerate() {
-                    CompletionItem::new(
-                        CompletionKind::Reference,
-                        ctx.source_range(),
-                        i.to_string(),
-                    )
-                    .kind(CompletionItemKind::Field)
-                    .detail(ty.to_string())
-                    .add_to(acc);
+                    acc.add_pos_field(CompletionKind::Reference, ctx, i, ty);
                 }
             }
             _ => {}
diff --git a/crates/ra_ide_api/src/completion/complete_struct_literal.rs b/crates/ra_ide_api/src/completion/complete_struct_literal.rs
index f8dd2baad..c617bff5f 100644
--- a/crates/ra_ide_api/src/completion/complete_struct_literal.rs
+++ b/crates/ra_ide_api/src/completion/complete_struct_literal.rs
@@ -1,7 +1,6 @@
-use hir::{Ty, AdtDef, Docs};
+use hir::{Ty, AdtDef};
 
-use crate::completion::{CompletionContext, Completions, CompletionItem, CompletionItemKind};
-use crate::completion::completion_item::CompletionKind;
+use crate::completion::{CompletionContext, Completions, CompletionKind};
 
 /// Complete fields in fields literals.
 pub(super) fn complete_struct_literal(acc: &mut Completions, ctx: &CompletionContext) {
@@ -23,15 +22,7 @@ pub(super) fn complete_struct_literal(acc: &mut Completions, ctx: &CompletionCon
     match adt {
         AdtDef::Struct(s) => {
             for field in s.fields(ctx.db) {
-                CompletionItem::new(
-                    CompletionKind::Reference,
-                    ctx.source_range(),
-                    field.name(ctx.db).to_string(),
-                )
-                .kind(CompletionItemKind::Field)
-                .detail(field.ty(ctx.db).subst(substs).to_string())
-                .set_documentation(field.docs(ctx.db))
-                .add_to(acc);
+                acc.add_field(CompletionKind::Reference, ctx, field, substs);
             }
         }
 
diff --git a/crates/ra_ide_api/src/completion/presentation.rs b/crates/ra_ide_api/src/completion/presentation.rs
new file mode 100644
index 000000000..6b2de56bc
--- /dev/null
+++ b/crates/ra_ide_api/src/completion/presentation.rs
@@ -0,0 +1,33 @@
+//! This modules takes care of rendering various defenitions as completion items.
+use hir::Docs;
+
+use crate::completion::{Completions, CompletionKind, CompletionItemKind, CompletionContext, CompletionItem};
+
+impl Completions {
+    pub(crate) fn add_field(
+        &mut self,
+        kind: CompletionKind,
+        ctx: &CompletionContext,
+        field: hir::StructField,
+        substs: &hir::Substs,
+    ) {
+        CompletionItem::new(kind, ctx.source_range(), field.name(ctx.db).to_string())
+            .kind(CompletionItemKind::Field)
+            .detail(field.ty(ctx.db).subst(substs).to_string())
+            .set_documentation(field.docs(ctx.db))
+            .add_to(self);
+    }
+
+    pub(crate) fn add_pos_field(
+        &mut self,
+        kind: CompletionKind,
+        ctx: &CompletionContext,
+        field: usize,
+        ty: &hir::Ty,
+    ) {
+        CompletionItem::new(kind, ctx.source_range(), field.to_string())
+            .kind(CompletionItemKind::Field)
+            .detail(ty.to_string())
+            .add_to(self);
+    }
+}