Updated memory backend to build prompt correctly

src/memory_backends/file_store.rs

@@ -114,7 +114,7 @@ impl FileStore {
 
         Ok(match prompt_type {
             PromptType::ContextAndCode => {
-                if params.messages.is_some() {
+                if params.is_for_chat {
                     let max_length = tokens_to_estimated_characters(params.max_context_length);
                     let start = cursor_index.saturating_sub(max_length / 2);
                     let end = rope
@@ -185,9 +185,9 @@ impl MemoryBackend for FileStore {
         &self,
         position: &TextDocumentPositionParams,
         prompt_type: PromptType,
-        params: Value,
+        params: &Value,
     ) -> anyhow::Result<Prompt> {
-        let params: MemoryRunParams = serde_json::from_value(params)?;
+        let params: MemoryRunParams = params.try_into()?;
         self.build_code(position, prompt_type, params)
     }
 
@@ -414,7 +414,7 @@ The end with a trailing new line
                     },
                 },
                 PromptType::ContextAndCode,
-                json!({}),
+                &json!({}),
             )
             .await?;
         let prompt: ContextAndCodePrompt = prompt.try_into()?;
@@ -434,7 +434,7 @@ The end with a trailing new line
                     },
                 },
                 PromptType::FIM,
-                json!({}),
+                &json!({}),
             )
             .await?;
         let prompt: FIMPrompt = prompt.try_into()?;
@@ -463,7 +463,7 @@ The end with a trailing new line
                     },
                 },
                 PromptType::ContextAndCode,
-                json!({
+                &json!({
                     "messages": []
                 }),
             )
@@ -510,7 +510,7 @@ The end with a trailing new line
                     },
                 },
                 PromptType::ContextAndCode,
-                json!({}),
+                &json!({}),
             )
             .await?;
         let prompt: ContextAndCodePrompt = prompt.try_into()?;
@@ -542,7 +542,7 @@ The end with a trailing new line
                     },
                 },
                 PromptType::ContextAndCode,
-                json!({"messages": []}),
+                &json!({"messages": []}),
             )
             .await?;
         let prompt: ContextAndCodePrompt = prompt.try_into()?;

src/memory_backends/mod.rs

@@ -2,31 +2,35 @@ use lsp_types::{
     DidChangeTextDocumentParams, DidOpenTextDocumentParams, RenameFilesParams,
     TextDocumentPositionParams,
 };
-use serde::Deserialize;
 use serde_json::Value;
 
-use crate::config::{ChatMessage, Config, ValidMemoryBackend};
+use crate::config::{Config, ValidMemoryBackend};
 
 pub mod file_store;
 mod postgresml;
 
-const fn max_context_length_default() -> usize {
-    1024
-}
-
 #[derive(Clone, Debug)]
 pub enum PromptType {
     ContextAndCode,
     FIM,
 }
 
-#[derive(Clone, Deserialize)]
+#[derive(Clone)]
 pub struct MemoryRunParams {
-    pub messages: Option<Vec<ChatMessage>>,
-    #[serde(default = "max_context_length_default")]
+    pub is_for_chat: bool,
     pub max_context_length: usize,
 }
 
+impl From<&Value> for MemoryRunParams {
+    fn from(value: &Value) -> Self {
+        Self {
+            max_context_length: value["max_context_length"].as_u64().unwrap_or(1024) as usize,
+            // messages are for most backends, contents are for Gemini
+            is_for_chat: value["messages"].is_array() || value["contents"].is_array(),
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct ContextAndCodePrompt {
     pub context: String,
@@ -119,7 +123,7 @@ pub trait MemoryBackend {
         &self,
         position: &TextDocumentPositionParams,
         prompt_type: PromptType,
-        params: Value,
+        params: &Value,
     ) -> anyhow::Result<Prompt>;
     async fn get_filter_text(
         &self,

src/memory_backends/postgresml/mod.rs

@@ -132,9 +132,9 @@ impl MemoryBackend for PostgresML {
         &self,
         position: &TextDocumentPositionParams,
         prompt_type: PromptType,
-        params: Value,
+        params: &Value,
     ) -> anyhow::Result<Prompt> {
-        let params: MemoryRunParams = serde_json::from_value(params)?;
+        let params: MemoryRunParams = params.try_into()?;
         let query = self
             .file_store
             .get_characters_around_position(position, 512)?;

src/memory_worker.rs

@@ -70,7 +70,7 @@ async fn do_task(
         }
         WorkerRequest::Prompt(params) => {
             let prompt = memory_backend
-                .build_prompt(&params.position, params.prompt_type, params.params)
+                .build_prompt(&params.position, params.prompt_type, &params.params)
                 .await?;
             params
                 .tx