rename completion -> ide_completion

We don't have completion-related PRs in flight, so lets do it

crates/ide_completion/src/render/enum_variant.rs

@@ -0,0 +1,131 @@
+//! Renderer for `enum` variants.
+
+use hir::{HasAttrs, HirDisplay, ModPath, StructKind};
+use ide_db::SymbolKind;
+use itertools::Itertools;
+use test_utils::mark;
+
+use crate::{
+    item::{CompletionItem, CompletionKind, ImportEdit},
+    render::{builder_ext::Params, RenderContext},
+};
+
+pub(crate) fn render_variant<'a>(
+    ctx: RenderContext<'a>,
+    import_to_add: Option<ImportEdit>,
+    local_name: Option<String>,
+    variant: hir::Variant,
+    path: Option<ModPath>,
+) -> CompletionItem {
+    let _p = profile::span("render_enum_variant");
+    EnumRender::new(ctx, local_name, variant, path).render(import_to_add)
+}
+
+#[derive(Debug)]
+struct EnumRender<'a> {
+    ctx: RenderContext<'a>,
+    name: String,
+    variant: hir::Variant,
+    path: Option<ModPath>,
+    qualified_name: String,
+    short_qualified_name: String,
+    variant_kind: StructKind,
+}
+
+impl<'a> EnumRender<'a> {
+    fn new(
+        ctx: RenderContext<'a>,
+        local_name: Option<String>,
+        variant: hir::Variant,
+        path: Option<ModPath>,
+    ) -> EnumRender<'a> {
+        let name = local_name.unwrap_or_else(|| variant.name(ctx.db()).to_string());
+        let variant_kind = variant.kind(ctx.db());
+
+        let (qualified_name, short_qualified_name) = match &path {
+            Some(path) => {
+                let full = path.to_string();
+                let segments = path.segments();
+                let short = segments[segments.len().saturating_sub(2)..].iter().join("::");
+                (full, short)
+            }
+            None => (name.to_string(), name.to_string()),
+        };
+
+        EnumRender { ctx, name, variant, path, qualified_name, short_qualified_name, variant_kind }
+    }
+
+    fn render(self, import_to_add: Option<ImportEdit>) -> CompletionItem {
+        let mut builder = CompletionItem::new(
+            CompletionKind::Reference,
+            self.ctx.source_range(),
+            self.qualified_name.clone(),
+        )
+        .kind(SymbolKind::Variant)
+        .set_documentation(self.variant.docs(self.ctx.db()))
+        .set_deprecated(self.ctx.is_deprecated(self.variant))
+        .add_import(import_to_add)
+        .detail(self.detail());
+
+        if self.variant_kind == StructKind::Tuple {
+            mark::hit!(inserts_parens_for_tuple_enums);
+            let params = Params::Anonymous(self.variant.fields(self.ctx.db()).len());
+            builder =
+                builder.add_call_parens(self.ctx.completion, self.short_qualified_name, params);
+        } else if self.path.is_some() {
+            builder = builder.lookup_by(self.short_qualified_name);
+        }
+
+        builder.build()
+    }
+
+    fn detail(&self) -> String {
+        let detail_types = self
+            .variant
+            .fields(self.ctx.db())
+            .into_iter()
+            .map(|field| (field.name(self.ctx.db()), field.signature_ty(self.ctx.db())));
+
+        match self.variant_kind {
+            StructKind::Tuple | StructKind::Unit => format!(
+                "({})",
+                detail_types.map(|(_, t)| t.display(self.ctx.db()).to_string()).format(", ")
+            ),
+            StructKind::Record => format!(
+                "{{ {} }}",
+                detail_types
+                    .map(|(n, t)| format!("{}: {}", n, t.display(self.ctx.db()).to_string()))
+                    .format(", ")
+            ),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use test_utils::mark;
+
+    use crate::test_utils::check_edit;
+
+    #[test]
+    fn inserts_parens_for_tuple_enums() {
+        mark::check!(inserts_parens_for_tuple_enums);
+        check_edit(
+            "Some",
+            r#"
+enum Option<T> { Some(T), None }
+use Option::*;
+fn main() -> Option<i32> {
+    Som$0
+}
+"#,
+            r#"
+enum Option<T> { Some(T), None }
+use Option::*;
+fn main() -> Option<i32> {
+    Some($0)
+}
+"#,
+        );
+    }
+}