Reduce some more code duplication

Author: Veykril

crates/completion/src/completions/pattern.rs

@@ -1,7 +1,5 @@
 //! Completes constats and paths in patterns.
 
-use hir::StructKind;
-
 use crate::{CompletionContext, Completions};
 
 /// Completes constants and paths in patterns.
@@ -22,11 +20,7 @@ pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
                     acc.add_struct_pat(ctx, strukt.clone(), Some(name.clone()));
                     true
                 }
-                hir::ModuleDef::Variant(variant)
-                    if !ctx.is_irrefutable_pat_binding
-                        // render_resolution already does some pattern completion tricks for tuple variants
-                        && variant.kind(ctx.db) == StructKind::Record =>
-                {
+                hir::ModuleDef::Variant(variant) if !ctx.is_irrefutable_pat_binding => {
                     acc.add_variant_pat(ctx, variant.clone(), Some(name.clone()));
                     true
                 }
@@ -49,7 +43,10 @@ pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
 mod tests {
     use expect_test::{expect, Expect};
 
-    use crate::{test_utils::completion_list, CompletionKind};
+    use crate::{
+        test_utils::{check_edit, completion_list},
+        CompletionKind,
+    };
 
     fn check(ra_fixture: &str, expect: Expect) {
         let actual = completion_list(ra_fixture, CompletionKind::Reference);
@@ -81,7 +78,7 @@ fn foo() {
                 en E
                 ct Z
                 st Bar
-                ev X   ()
+                ev X
                 md m
             "#]],
         );
@@ -238,4 +235,27 @@ fn outer() {
             "#]],
         )
     }
+
+    #[test]
+    fn only_shows_ident_completion() {
+        check_edit(
+            "Foo",
+            r#"
+struct Foo(i32);
+fn main() {
+    match Foo(92) {
+        <|>(92) => (),
+    }
+}
+"#,
+            r#"
+struct Foo(i32);
+fn main() {
+    match Foo(92) {
+        Foo(92) => (),
+    }
+}
+"#,
+        );
+    }
 }

crates/completion/src/render.rs

@@ -160,6 +160,12 @@ impl<'a> Render<'a> {
                 let item = render_fn(self.ctx, import_to_add, Some(local_name), *func);
                 return Some(item);
             }
+            ScopeDef::ModuleDef(Variant(_))
+                if self.ctx.completion.is_pat_binding_or_const
+                    | self.ctx.completion.is_irrefutable_pat_binding =>
+            {
+                CompletionItemKind::EnumVariant
+            }
             ScopeDef::ModuleDef(Variant(var)) => {
                 let item = render_variant(self.ctx, import_to_add, Some(local_name), *var, None);
                 return Some(item);

crates/completion/src/render/builder_ext.rs

@@ -34,7 +34,6 @@ impl Builder {
             return false;
         }
         if ctx.is_pattern_call {
-            mark::hit!(dont_duplicate_pattern_parens);
             return false;
         }
         if ctx.is_call {

crates/completion/src/render/enum_variant.rs

@@ -124,51 +124,6 @@ use Option::*;
 fn main() -> Option<i32> {
     Some($0)
 }
-"#,
-        );
-        check_edit(
-            "Some",
-            r#"
-enum Option<T> { Some(T), None }
-use Option::*;
-fn main(value: Option<i32>) {
-    match value {
-        Som<|>
-    }
-}
-"#,
-            r#"
-enum Option<T> { Some(T), None }
-use Option::*;
-fn main(value: Option<i32>) {
-    match value {
-        Some($0)
-    }
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn dont_duplicate_pattern_parens() {
-        mark::check!(dont_duplicate_pattern_parens);
-        check_edit(
-            "Var",
-            r#"
-enum E { Var(i32) }
-fn main() {
-    match E::Var(92) {
-        E::<|>(92) => (),
-    }
-}
-"#,
-            r#"
-enum E { Var(i32) }
-fn main() {
-    match E::Var(92) {
-        E::Var(92) => (),
-    }
-}
 "#,
         );
     }

crates/completion/src/render/pattern.rs

@@ -8,42 +8,43 @@ use crate::{
     CompletionItemKind,
 };
 
+fn visible_fields(
+    ctx: &RenderContext<'_>,
+    fields: &[hir::Field],
+    item: impl HasAttrs,
+) -> Option<(Vec<hir::Field>, bool)> {
+    let module = ctx.completion.scope.module()?;
+    let n_fields = fields.len();
+    let fields = fields
+        .into_iter()
+        .filter(|field| field.is_visible_from(ctx.db(), module))
+        .copied()
+        .collect::<Vec<_>>();
+
+    let fields_omitted =
+        n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
+    Some((fields, fields_omitted))
+}
+
 pub(crate) fn render_struct_pat(
     ctx: RenderContext<'_>,
     strukt: hir::Struct,
     local_name: Option<Name>,
 ) -> Option<CompletionItem> {
     let _p = profile::span("render_struct_pat");
 
-    let module = ctx.completion.scope.module()?;
     let fields = strukt.fields(ctx.db());
-    let n_fields = fields.len();
-    let fields = fields
-        .into_iter()
-        .filter(|field| field.is_visible_from(ctx.db(), module))
-        .collect::<Vec<_>>();
+    let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
 
-    if fields.is_empty() {
+    if visible_fields.is_empty() {
         // Matching a struct without matching its fields is pointless, unlike matching a Variant without its fields
         return None;
     }
-    let fields_omitted =
-        n_fields - fields.len() > 0 || strukt.attrs(ctx.db()).by_key("non_exhaustive").exists();
 
     let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
-    let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &fields, fields_omitted)?;
+    let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &visible_fields, fields_omitted)?;
 
-    let mut completion = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name)
-        .kind(CompletionItemKind::Binding)
-        .set_documentation(ctx.docs(strukt))
-        .set_deprecated(ctx.is_deprecated(strukt))
-        .detail(&pat);
-    if let Some(snippet_cap) = ctx.snippet_cap() {
-        completion = completion.insert_snippet(snippet_cap, pat);
-    } else {
-        completion = completion.insert_text(pat);
-    }
-    Some(completion.build())
+    Some(build_completion(ctx, name, pat, strukt))
 }
 
 pub(crate) fn render_variant_pat(
@@ -53,31 +54,32 @@ pub(crate) fn render_variant_pat(
 ) -> Option<CompletionItem> {
     let _p = profile::span("render_variant_pat");
 
-    let module = ctx.completion.scope.module()?;
     let fields = variant.fields(ctx.db());
-    let n_fields = fields.len();
-    let fields = fields
-        .into_iter()
-        .filter(|field| field.is_visible_from(ctx.db(), module))
-        .collect::<Vec<_>>();
-
-    let fields_omitted =
-        n_fields - fields.len() > 0 || variant.attrs(ctx.db()).by_key("non_exhaustive").exists();
+    let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, variant)?;
 
     let name = local_name.unwrap_or_else(|| variant.name(ctx.db())).to_string();
-    let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &fields, fields_omitted)?;
+    let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &visible_fields, fields_omitted)?;
 
-    let mut completion = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name)
+    Some(build_completion(ctx, name, pat, variant))
+}
+
+fn build_completion(
+    ctx: RenderContext<'_>,
+    name: String,
+    pat: String,
+    item: impl HasAttrs + Copy,
+) -> CompletionItem {
+    let completion = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name)
         .kind(CompletionItemKind::Binding)
-        .set_documentation(ctx.docs(variant))
-        .set_deprecated(ctx.is_deprecated(variant))
+        .set_documentation(ctx.docs(item))
+        .set_deprecated(ctx.is_deprecated(item))
         .detail(&pat);
-    if let Some(snippet_cap) = ctx.snippet_cap() {
-        completion = completion.insert_snippet(snippet_cap, pat);
+    let completion = if let Some(snippet_cap) = ctx.snippet_cap() {
+        completion.insert_snippet(snippet_cap, pat)
     } else {
-        completion = completion.insert_text(pat);
-    }
-    Some(completion.build())
+        completion.insert_text(pat)
+    };
+    completion.build()
 }
 
 fn render_pat(