Introduce render module

crates/completion/src/render.rs

@@ -0,0 +1,50 @@
+//! `render` module provides utilities for rendering completion suggestions
+//! into code pieces that will be presented to user.
+
+mod macro_;
+mod function;
+mod builder_ext;
+mod enum_variant;
+
+use hir::HasAttrs;
+use ide_db::RootDatabase;
+use syntax::TextRange;
+
+use crate::{config::SnippetCap, CompletionContext};
+
+pub(crate) use crate::render::{
+    enum_variant::EnumVariantRender, function::FunctionRender, macro_::MacroRender,
+};
+
+#[derive(Debug)]
+pub(crate) struct RenderContext<'a> {
+    completion: &'a CompletionContext<'a>,
+}
+
+impl<'a> RenderContext<'a> {
+    pub fn new(completion: &'a CompletionContext<'a>) -> RenderContext<'a> {
+        RenderContext { completion }
+    }
+
+    pub fn snippet_cap(&self) -> Option<SnippetCap> {
+        self.completion.config.snippet_cap.clone()
+    }
+
+    pub fn db(&self) -> &'a RootDatabase {
+        &self.completion.db
+    }
+
+    pub fn source_range(&self) -> TextRange {
+        self.completion.source_range()
+    }
+
+    pub fn is_deprecated(&self, node: impl HasAttrs) -> bool {
+        node.attrs(self.db()).by_key("deprecated").exists()
+    }
+}
+
+impl<'a> From<&'a CompletionContext<'a>> for RenderContext<'a> {
+    fn from(ctx: &'a CompletionContext<'a>) -> RenderContext<'a> {
+        RenderContext::new(ctx)
+    }
+}