diff --git a/src/main.rs b/src/main.rs
index 2b2ad67..75a9f6c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,8 +12,7 @@ use std::collections::HashMap;
 use tokio::sync::Mutex;
 use tower_lsp::lsp_types::*;
 use tower_lsp::{Client, LanguageServer, LspService, Server};
-use tracing::{error, info};
-use tree_sitter::Parser as TSParser;
+use tracing::error;
 
 mod embed;
 mod state;
@@ -267,6 +266,7 @@ impl LanguageServer for Backend {
         params: CodeActionParams,
     ) -> tower_lsp::jsonrpc::Result<Option<CodeActionResponse>> {
         let uri = params.text_document.uri;
+        let extension = url_extension(&uri);
         let body = self.body.lock().await.to_string();
 
         let range = params.range;
@@ -278,93 +278,50 @@ impl LanguageServer for Backend {
             return Ok(None);
         };
 
-        let Some((prompt, lang)) = desc.rsplit_once(" in ") else {
+        let (prompt, lang) = if let Some(ext) = extension {
+            (desc, ext)
+        } else if let Some((prompt, lang)) = desc.rsplit_once(" in ") {
+            (prompt, lang.to_string())
+        } else {
             error!("{}", v2::errors::Error::MissingSuffix);
             return Ok(None);
         };
 
-        let langfn = match v2::api::get_lang(lang) {
-            Ok(o) => o,
-            Err(e) => {
-                error!("{e}");
-                return Ok(None);
-            }
-        };
-
-        info!(prompt = prompt, language = lang, "v2 request");
-
-        let mut appstate = self
-            .appstate
-            .inner
-            .lock()
-            .map_err(|_| v2::errors::Error::Busy)
-            .expect("booo");
-        let target = appstate
-            .embed
-            .embed(prompt)
-            .map_err(|_| v2::errors::Error::EmbedFailed)
-            .expect("booo");
-        let mut parser = TSParser::new();
-        parser
-            .set_language(&langfn)
-            .map_err(|_| v2::errors::Error::UnknownLang)
-            .expect("boo");
-
-        let source_code = new_text;
-        let source_bytes = source_code.as_bytes();
-        let tree = parser
-            .parse(source_code, None)
-            .ok_or(v2::errors::Error::SnippetParsing)
-            .expect("boo");
-        let root_node = tree.root_node();
-
-        // search for k nearest neighbors
-        let closest: Vec<String> = appstate.v2.dict[lang]
-            .search(&target, 1)
-            .iter()
-            .filter_map(|&index| {
-                let applied = v2::mutation::apply(
-                    langfn.clone(),
-                    source_bytes,
-                    root_node,
-                    &appstate.v2.mutations_collection[index],
-                );
-                match applied {
-                    Ok(v) => Some(v),
-                    Err(e) => {
-                        error!(
-                            collection_index = index,
-                            "failed to apply mutations from collection {}", e
-                        );
-                        None
-                    }
+        let closest_matches =
+            match v2::api::closest_mutation(&lang, prompt, &body, 1, &self.appstate) {
+                Ok(v) => v,
+                Err(e) => {
+                    error!("{}", e);
+                    return Ok(None);
                 }
-                // TODO: change the expect to a log
-            })
-            .collect();
-
-        let closest = closest[0].clone();
+            };
 
+        let Some(closest) = closest_matches.into_iter().next() else {
+            return Ok(None);
+        };
         let text_edit = TextEdit {
             range,
             new_text: closest,
         };
         let changes: HashMap<Url, _> = [(uri, vec![text_edit])].into_iter().collect();
-        let edit = WorkspaceEdit {
+        let edit = Some(WorkspaceEdit {
             changes: Some(changes),
             document_changes: None,
             change_annotations: None,
-        };
+        });
         let actions = vec![CodeActionOrCommand::CodeAction(CodeAction {
             title: "ask silos".to_string(),
-            kind: None,
-            diagnostics: None,
-            edit: Some(edit),
-            command: None,
-            is_preferred: None,
-            disabled: None,
-            data: None,
+            edit,
+            ..Default::default()
         })];
         Ok(Some(actions))
     }
 }
+
+pub fn url_extension(u: &Url) -> Option<String> {
+    let file_path = u.to_file_path().ok()?;
+
+    let extension = file_path.extension()?;
+    let extension = extension.to_str()?;
+    Some(extension.to_string())
+}
diff --git a/src/v2/api.rs b/src/v2/api.rs
index cad0139..480a4af 100644
--- a/src/v2/api.rs
+++ b/src/v2/api.rs
@@ -52,6 +52,23 @@ pub(crate) async fn get_snippet(
         return Err(Error::MissingSuffix);
     };
 
+    let closest = closest_mutation(
+        lang,
+        prompt,
+        snippet_request.body.as_str(),
+        snippet_request.top_k.unwrap_or(1),
+        &data,
+    )?;
+    Ok(web::Json(closest))
+}
+
+pub fn closest_mutation(
+    lang: &str,
+    prompt: &str,
+    body: &str,
+    top_k: usize,
+    data: &web::Data<crate::state::StateWrapper>,
+) -> Result<Vec<String>, Error> {
     let langfn = get_lang(lang)?;
 
     info!(prompt = prompt, language = lang, "v2 request");
@@ -66,7 +83,7 @@ pub(crate) async fn get_snippet(
         .set_language(&langfn)
         .map_err(|_| Error::UnknownLang)?;
 
-    let source_code = snippet_request.body.as_str();
+    let source_code = body;
     let source_bytes = source_code.as_bytes();
     let tree = parser
         .parse(source_code, None)
@@ -74,8 +91,8 @@ pub(crate) async fn get_snippet(
     let root_node = tree.root_node();
 
     // search for k nearest neighbors
-    let closest: Vec<String> = appstate.v2.dict[lang]
-        .search(&target, snippet_request.top_k.unwrap_or(1))
+    let collected = appstate.v2.dict[lang]
+        .search(&target, top_k)
         .iter()
         .filter_map(|&index| {
             let applied = mutation::apply(
@@ -97,5 +114,5 @@ pub(crate) async fn get_snippet(
             // TODO: change the expect to a log
         })
         .collect();
-    Ok(web::Json(closest))
+    Ok(collected)
 }