Riz Ashraf
1fd1d119e6
This makes the stub purely non-blocking via tokio::spawn and fixes cross-OS compilation boundaries in build.cmd
433 lines
17 KiB
Rust
433 lines
17 KiB
Rust
mod mcp;
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use mcp::{read_message, send_response, send_error, JsonRpcResponse};
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use serde_json::{json, Value};
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use tokio::net::UnixStream;
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use tokio::io::{AsyncReadExt, AsyncWriteExt};
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#[tokio::main]
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async fn main() {
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loop {
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let msg = match read_message().await {
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Some(m) => m,
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None => break,
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};
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tokio::spawn(async move {
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let id = msg.id.clone().unwrap_or(json!(null));
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match msg.method.as_str() {
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"initialize" => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"capabilities": {},
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"serverInfo": {
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"name": "mcp-memory-linux-nvim",
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"version": "0.1.0"
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}
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})),
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error: None,
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}).await;
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}
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"tools/list" => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"tools": [
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{
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"name": "nvim_goto_line",
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"description": "Open a file and jump to a specific line",
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"inputSchema": {
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"type": "object",
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"properties": {
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"file": { "type": "string" },
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"line": { "type": "integer" }
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},
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"required": ["file", "line"]
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}
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},
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{
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"name": "nvim_get_active_buffer",
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"description": "Get the contents of the currently active Neovim buffer",
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"inputSchema": {
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"type": "object",
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"properties": {}
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}
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},
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{
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"name": "nvim_get_cursor",
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"description": "Get the current cursor position (line and column) in the active Neovim buffer",
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"inputSchema": {
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"type": "object",
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"properties": {}
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}
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},
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{
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"name": "nvim_get_visual_selection",
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"description": "Get the text that is currently highlighted or was last highlighted in Visual mode",
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"inputSchema": {
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"type": "object",
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"properties": {}
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}
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},
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{
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"name": "nvim_set_diagnostics",
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"description": "Push a diagnostic message (like an LSP warning) to a specific line in the active buffer",
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"inputSchema": {
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"type": "object",
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"properties": {
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"line": { "type": "integer" },
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"message": { "type": "string" }
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},
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"required": ["line", "message"]
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}
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}
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]
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})),
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error: None,
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}).await;
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}
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"tools/call" => {
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let params = msg.params.clone().unwrap_or(json!({}));
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let name = params.get("name").and_then(|v| v.as_str()).unwrap_or("");
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let args = params.get("arguments").cloned().unwrap_or(json!({}));
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match name {
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"nvim_goto_line" => {
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let file = args.get("file").and_then(|v| v.as_str()).unwrap_or("");
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let line = args.get("line").and_then(|v| v.as_i64()).unwrap_or(1);
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let cmd = format!("edit {} | {} | normal! zz", file, line);
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match send_nvim_command(&cmd).await {
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Ok(_) => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"content": [
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{ "type": "text", "text": format!("Successfully jumped to {}:{}", file, line) }
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]
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})),
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error: None,
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}).await;
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}
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Err(e) => {
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send_error(id, -32603, &format!("Failed to execute command: {}", e)).await;
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}
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}
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}
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"nvim_get_active_buffer" => {
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match get_nvim_active_buffer().await {
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Ok(content) => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"content": [
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{ "type": "text", "text": content }
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]
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})),
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error: None,
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}).await;
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}
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Err(e) => {
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send_error(id, -32603, &format!("Failed to get active buffer: {}", e)).await;
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}
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}
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}
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"nvim_get_cursor" => {
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match get_nvim_cursor().await {
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Ok(content) => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"content": [
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{ "type": "text", "text": content }
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]
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})),
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error: None,
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}).await;
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}
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Err(e) => {
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send_error(id, -32603, &format!("Failed to get cursor: {}", e)).await;
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}
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}
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}
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"nvim_get_visual_selection" => {
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match get_nvim_visual_selection().await {
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Ok(content) => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"content": [
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{ "type": "text", "text": content }
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]
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})),
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error: None,
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}).await;
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}
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Err(e) => {
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send_error(id, -32603, &format!("Failed to get visual selection: {}", e)).await;
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}
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}
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}
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"nvim_set_diagnostics" => {
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let line = args.get("line").and_then(|v| v.as_i64()).unwrap_or(1);
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let message = args.get("message").and_then(|v| v.as_str()).unwrap_or("");
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match set_nvim_diagnostics(line, message).await {
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Ok(_) => {
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send_response(JsonRpcResponse {
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jsonrpc: "2.0".to_string(),
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id,
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result: Some(json!({
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"content": [
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{ "type": "text", "text": format!("Successfully set diagnostic on line {}", line) }
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]
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})),
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error: None,
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}).await;
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}
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Err(e) => {
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send_error(id, -32603, &format!("Failed to set diagnostic: {}", e)).await;
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}
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}
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}
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_ => {
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send_error(id, -32601, "Tool not found").await;
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}
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}
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}
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_ => {
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// Ignore other methods
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}
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}
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});
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}
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}
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async fn get_socket_path() -> Result<String, String> {
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// 1. Try active_nvim.txt first
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if let Ok(home) = std::env::var("HOME") {
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let path = format!("{}/.gemini/active_nvim.txt", home);
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if let Ok(content) = std::fs::read_to_string(&path) {
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let p = content.trim().to_string();
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if !p.is_empty() {
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return Ok(p);
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}
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}
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}
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// 2. Fallback: search /tmp/nvim.*/0
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if let Ok(entries) = std::fs::read_dir("/tmp") {
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for entry in entries.flatten() {
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if let Ok(name) = entry.file_name().into_string() {
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if name.starts_with("nvim.") {
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let path = entry.path().join("0");
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if path.exists() {
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return Ok(path.to_string_lossy().to_string());
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}
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}
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}
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}
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}
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Err("Could not find Neovim socket".to_string())
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}
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async fn call_nvim(req: rmpv::Value) -> Result<rmpv::Value, String> {
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let msgid = if let rmpv::Value::Array(ref arr) = req {
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if arr.len() > 1 { arr[1].clone() } else { rmpv::Value::Nil }
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} else { rmpv::Value::Nil };
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let socket_path = get_socket_path().await?;
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let mut stream = UnixStream::connect(socket_path).await.map_err(|e| e.to_string())?;
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let mut buf = Vec::new();
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rmpv::encode::write_value(&mut buf, &req).map_err(|e| e.to_string())?;
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stream.write_all(&buf).await.map_err(|e| e.to_string())?;
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let mut resp_buf = Vec::new();
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let mut chunk = vec![0u8; 8192];
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let mut offset = 0;
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loop {
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let mut cursor = std::io::Cursor::new(&resp_buf[offset..]);
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match rmpv::decode::read_value(&mut cursor) {
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Ok(val) => {
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offset += cursor.position() as usize;
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if let rmpv::Value::Array(ref arr) = val {
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if arr.len() >= 4 && arr[0] == rmpv::Value::Integer(1.into()) && arr[1] == msgid {
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return Ok(val);
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}
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}
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continue;
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},
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Err(_) => {
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let n = stream.read(&mut chunk).await.map_err(|e| e.to_string())?;
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if n == 0 {
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return Err("Unexpected EOF from Neovim".to_string());
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}
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resp_buf.extend_from_slice(&chunk[..n]);
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}
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}
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}
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}
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async fn send_nvim_command(cmd: &str) -> Result<(), String> {
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use rmpv::Value as RmpValue;
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let req = RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(1.into()), // msgid
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RmpValue::String("nvim_command".into()),
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RmpValue::Array(vec![RmpValue::String(cmd.into())]),
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]);
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let resp = call_nvim(req).await?;
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if let RmpValue::Array(arr) = resp {
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if !arr[2].is_nil() {
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return Err(format!("Neovim error: {:?}", arr[2]));
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}
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return Ok(());
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}
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Err("Invalid response".to_string())
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}
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async fn get_nvim_active_buffer() -> Result<String, String> {
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use rmpv::Value as RmpValue;
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let req = RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(2.into()), // msgid
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RmpValue::String("nvim_buf_get_lines".into()),
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RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(0.into()),
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RmpValue::Integer((-1).into()),
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RmpValue::Boolean(true),
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]),
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]);
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let resp = call_nvim(req).await?;
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if let RmpValue::Array(arr) = resp {
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if !arr[2].is_nil() {
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return Err(format!("Neovim error: {:?}", arr[2]));
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}
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if let RmpValue::Array(lines) = &arr[3] {
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let mut text = String::new();
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for line in lines {
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if let RmpValue::String(s) = line {
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if let Some(s) = s.as_str() {
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text.push_str(s);
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text.push('\n');
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}
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}
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}
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return Ok(text);
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}
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}
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Err("Invalid response".to_string())
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}
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async fn get_nvim_cursor() -> Result<String, String> {
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use rmpv::Value as RmpValue;
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let req = RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(3.into()), // msgid
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RmpValue::String("nvim_win_get_cursor".into()),
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RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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]),
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]);
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let resp = call_nvim(req).await?;
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if let RmpValue::Array(arr) = resp {
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if !arr[2].is_nil() {
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return Err(format!("Neovim error: {:?}", arr[2]));
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}
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if let RmpValue::Array(pos) = &arr[3] {
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if pos.len() == 2 {
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if let (RmpValue::Integer(row), RmpValue::Integer(col)) = (&pos[0], &pos[1]) {
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return Ok(format!("Line: {}, Column: {}", row, col));
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}
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}
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}
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}
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Err("Invalid response".to_string())
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}
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async fn get_nvim_visual_selection() -> Result<String, String> {
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let lua_script = r#"
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local _, csrow, cscol, _ = unpack(vim.fn.getpos("'<"))
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local _, cerow, cecol, _ = unpack(vim.fn.getpos("'>"))
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local lines = vim.fn.getline(csrow, cerow)
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if type(lines) == "table" then
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return table.concat(lines, "\n")
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else
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return lines
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end
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"#;
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use rmpv::Value as RmpValue;
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let req = RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(4.into()), // msgid
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RmpValue::String("nvim_exec_lua".into()),
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RmpValue::Array(vec![
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RmpValue::String(lua_script.into()),
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RmpValue::Array(vec![]),
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]),
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]);
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let resp = call_nvim(req).await?;
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if let RmpValue::Array(arr) = resp {
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if !arr[2].is_nil() {
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return Err(format!("Neovim error: {:?}", arr[2]));
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}
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if let RmpValue::String(s) = &arr[3] {
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if let Some(text) = s.as_str() {
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return Ok(text.to_string());
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}
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}
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}
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Err("Invalid response".to_string())
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}
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async fn set_nvim_diagnostics(line: i64, message: &str) -> Result<(), String> {
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let escaped_message = message.replace("\\", "\\\\").replace("\"", "\\\"");
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let lua_script = format!(r#"
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local ns = vim.api.nvim_create_namespace("gemini_diagnostics")
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local diagnostics = {{{{
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lnum = {} - 1,
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col = 0,
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severity = vim.diagnostic.severity.WARN,
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message = "{}",
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}}}}
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vim.diagnostic.set(ns, 0, diagnostics, {{}})
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"#, line, escaped_message);
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use rmpv::Value as RmpValue;
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let req = RmpValue::Array(vec![
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RmpValue::Integer(0.into()),
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RmpValue::Integer(5.into()), // msgid
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RmpValue::String("nvim_exec_lua".into()),
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RmpValue::Array(vec![
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RmpValue::String(lua_script.into()),
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RmpValue::Array(vec![]),
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]),
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]);
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let resp = call_nvim(req).await?;
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if let RmpValue::Array(arr) = resp {
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if !arr[2].is_nil() {
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return Err(format!("Neovim error: {:?}", arr[2]));
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}
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return Ok(());
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}
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Err("Invalid response".to_string())
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}
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