From 5d7b5db8ab284e0c2a41e6fbda08857f87406780 Mon Sep 17 00:00:00 2001
From: Gabriel Berto
Date: Sat, 25 Dec 2021 07:00:57 -0300
Subject: Resolve completion item (#1315)

Co-authored-by: Gabriel Berto <gabriel.berto@pottencial.com.br>---
 helix-term/src/ui/completion.rs | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

(limited to 'helix-term/src/ui')

diff --git a/helix-term/src/ui/completion.rs b/helix-term/src/ui/completion.rs
index a55201ff..274330c0 100644
--- a/helix-term/src/ui/completion.rs
+++ b/helix-term/src/ui/completion.rs
@@ -154,8 +154,19 @@ impl Completion {
                     );
                     doc.apply(&transaction, view.id);
 
-                    if let Some(additional_edits) = &item.additional_text_edits {
-                        // gopls uses this to add extra imports
+                    // apply additional edits, mostly used to auto import unqualified types
+                    let resolved_additional_text_edits = if item.additional_text_edits.is_some() {
+                        None
+                    } else {
+                        Completion::resolve_completion_item(doc, item.clone())
+                            .and_then(|item| item.additional_text_edits)
+                    };
+
+                    if let Some(additional_edits) = item
+                        .additional_text_edits
+                        .as_ref()
+                        .or_else(|| resolved_additional_text_edits.as_ref())
+                    {
                         if !additional_edits.is_empty() {
                             let transaction = util::generate_transaction_from_edits(
                                 doc.text(),
@@ -181,6 +192,31 @@ impl Completion {
         completion
     }
 
+    fn resolve_completion_item(
+        doc: &Document,
+        completion_item: lsp::CompletionItem,
+    ) -> Option<CompletionItem> {
+        let language_server = doc.language_server()?;
+        let completion_resolve_provider = language_server
+            .capabilities()
+            .completion_provider
+            .as_ref()?
+            .resolve_provider;
+        if completion_resolve_provider != Some(true) {
+            return None;
+        }
+
+        let future = language_server.resolve_completion_item(completion_item);
+        let response = helix_lsp::block_on(future);
+        match response {
+            Ok(completion_item) => Some(completion_item),
+            Err(err) => {
+                log::error!("execute LSP command: {}", err);
+                None
+            }
+        }
+    }
+
     pub fn recompute_filter(&mut self, editor: &Editor) {
         // recompute menu based on matches
         let menu = self.popup.contents_mut();
-- 
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