feat(lsp): implement LSP client and server management
- Added LspClient for handling communication with LSP servers, including methods for initialization, notifications, and requests. - Introduced LspManager to manage multiple LSP server connections, allowing for connection, disconnection, and retrieval of server capabilities. - Created tools for connecting to LSP servers, retrieving diagnostics, hover information, code completion, definitions, and references. - Enhanced UI rendering to display token usage and settings in the overlay. - Updated status bar to show current token usage and selected provider/model.
This commit is contained in:
asepharyana
@@ -0,0 +1,329 @@
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use std::io::{BufRead, BufReader, Read, Write};
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use std::process::{Command, Stdio};
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use std::time::{Duration, Instant};
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use serde_json::{json, Value};
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const LSP_INIT_TIMEOUT_MS: u64 = 60_000;
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const LSP_CALL_TIMEOUT_MS: u64 = 30_000;
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const LSP_DIAGNOSTICS_TIMEOUT_MS: u64 = 10_000;
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pub struct LspClient {
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stdin: std::process::ChildStdin,
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stdout: BufReader<std::process::ChildStdout>,
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next_id: u64,
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server_capabilities: Value,
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}
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fn file_path_to_uri(path: &str) -> String {
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let abs_path = std::path::Path::new(path);
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let abs_path = if abs_path.is_relative() {
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match std::env::current_dir() {
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Ok(cwd) => cwd.join(path),
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Err(_) => abs_path.to_path_buf(),
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}
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} else {
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abs_path.to_path_buf()
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};
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let canonical = abs_path.canonicalize().unwrap_or(abs_path);
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let path_str = canonical.to_string_lossy();
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if cfg!(windows) {
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let path_str = path_str.replace('\\', "/");
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if path_str.starts_with('/') {
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format!("file://{}", path_str)
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} else {
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format!("file:///{}", path_str)
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}
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} else {
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format!("file://{}", path_str)
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}
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}
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impl LspClient {
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pub fn spawn(command: &str, args: &[String]) -> anyhow::Result<Self> {
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let mut cmd = Command::new(command);
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cmd.args(args);
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cmd.stdin(Stdio::piped());
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cmd.stdout(Stdio::piped());
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cmd.stderr(Stdio::piped());
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let mut child = cmd.spawn()
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.map_err(|e| anyhow::anyhow!("failed to spawn LSP server '{}': {}", command, e))?;
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let stdin = child.stdin.take()
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.ok_or_else(|| anyhow::anyhow!("failed to capture stdin for LSP server"))?;
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let stdout = BufReader::new(child.stdout.take()
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.ok_or_else(|| anyhow::anyhow!("failed to capture stdout for LSP server"))?);
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let mut client = LspClient {
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stdin,
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stdout,
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next_id: 0,
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server_capabilities: Value::Null,
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};
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let init_params = json!({
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"processId": std::process::id(),
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"clientInfo": {
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"name": "zesdex",
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"version": "0.1.0"
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},
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"capabilities": {
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"textDocument": {
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"synchronization": {
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"dynamicRegistration": true,
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"willSave": false,
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"willSaveWaitUntil": false,
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"didSave": false
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},
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"hover": {
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"dynamicRegistration": true,
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"contentFormat": ["plaintext", "markdown"]
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},
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"completion": {
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"dynamicRegistration": true,
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"completionItem": {
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"snippetSupport": false
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}
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},
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"definition": {
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"dynamicRegistration": true
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},
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"references": {
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"dynamicRegistration": true
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},
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"documentSymbol": {
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"dynamicRegistration": true,
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"hierarchicalDocumentSymbolSupport": true
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}
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},
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"workspace": {
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"workspaceFolders": true
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},
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"general": {
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"positionEncodings": ["utf-16"]
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}
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}
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});
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let result = client.call_with_timeout("initialize", init_params, Duration::from_millis(LSP_INIT_TIMEOUT_MS))?;
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client.server_capabilities = result.get("capabilities").cloned().unwrap_or_default();
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client.notify("initialized", json!({}))?;
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Ok(client)
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}
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pub fn server_capabilities(&self) -> &Value {
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&self.server_capabilities
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}
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pub fn call(&mut self, method: &str, params: Value) -> anyhow::Result<Value> {
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self.call_with_timeout(method, params, Duration::from_millis(LSP_CALL_TIMEOUT_MS))
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}
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fn call_with_timeout(&mut self, method: &str, params: Value, timeout: Duration) -> anyhow::Result<Value> {
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self.next_id += 1;
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let id = self.next_id;
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let req = json!({
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"jsonrpc": "2.0",
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"id": id,
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"method": method,
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"params": params
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});
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self.send_frame(&req)?;
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self.read_response(id, timeout)
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}
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pub fn notify(&mut self, method: &str, params: Value) -> anyhow::Result<()> {
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let req = json!({
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"jsonrpc": "2.0",
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"method": method,
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"params": params
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});
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self.send_frame(&req)
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}
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fn send_frame(&mut self, msg: &Value) -> anyhow::Result<()> {
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let body = serde_json::to_string(msg)
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.map_err(|e| anyhow::anyhow!("failed to serialize LSP message: {}", e))?;
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let header = format!("Content-Length: {}\r\n\r\n", body.len());
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self.stdin.write_all(header.as_bytes())
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.map_err(|e| anyhow::anyhow!("failed to write LSP frame header: {}", e))?;
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self.stdin.write_all(body.as_bytes())
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.map_err(|e| anyhow::anyhow!("failed to write LSP frame body: {}", e))?;
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self.stdin.flush()
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.map_err(|e| anyhow::anyhow!("failed to flush LSP stdin: {}", e))?;
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Ok(())
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}
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fn read_response(&mut self, expected_id: u64, timeout: Duration) -> anyhow::Result<Value> {
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let deadline = Instant::now() + timeout;
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loop {
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if Instant::now() > deadline {
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anyhow::bail!("LSP call timed out after {}ms", timeout.as_millis());
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}
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let frame = self.read_frame()?;
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if frame.get("id") == Some(&json!(expected_id)) {
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if let Some(err) = frame.get("error") {
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let code = err.get("code").and_then(|c| c.as_i64()).unwrap_or(0);
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let msg = err.get("message").and_then(|m| m.as_str()).unwrap_or("unknown error");
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anyhow::bail!("LSP error {}: {}", code, msg);
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}
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return Ok(frame.get("result").cloned().unwrap_or(Value::Null));
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}
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}
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}
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pub fn read_notification(&mut self, method: &str, timeout: Duration) -> anyhow::Result<Value> {
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let deadline = Instant::now() + timeout;
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loop {
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if Instant::now() > deadline {
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anyhow::bail!("timed out waiting for LSP notification '{}'", method);
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}
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let frame = self.read_frame()?;
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if frame.get("method") == Some(&json!(method)) {
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return Ok(frame.get("params").cloned().unwrap_or(Value::Null));
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}
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}
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}
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fn read_frame(&mut self) -> anyhow::Result<Value> {
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let mut content_length: Option<usize> = None;
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loop {
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let mut line = String::new();
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match self.stdout.read_line(&mut line) {
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Ok(0) => anyhow::bail!("LSP server closed the connection"),
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Ok(_) => {}
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Err(e) => anyhow::bail!("LSP read error: {}", e),
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}
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let trimmed = line.trim();
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if trimmed.is_empty() {
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break;
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}
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if let Some(len_str) = trimmed.strip_prefix("Content-Length: ") {
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content_length = Some(
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len_str.trim().parse::<usize>()
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.map_err(|e| anyhow::anyhow!("invalid Content-Length '{}': {}", len_str.trim(), e))?,
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);
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}
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}
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let length = content_length
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.ok_or_else(|| anyhow::anyhow!("missing Content-Length header in LSP response"))?;
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let mut body = vec![0u8; length];
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self.stdout.read_exact(&mut body)
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.map_err(|e| anyhow::anyhow!("failed to read LSP body ({} bytes): {}", length, e))?;
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let json_str = String::from_utf8(body)
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.map_err(|e| anyhow::anyhow!("invalid UTF-8 in LSP response: {}", e))?;
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serde_json::from_str(&json_str)
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.map_err(|e| anyhow::anyhow!("invalid JSON in LSP response: {}", e))
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}
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pub fn did_open(&mut self, uri: &str, language_id: &str, version: i32, text: &str) -> anyhow::Result<()> {
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self.notify("textDocument/didOpen", json!({
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"textDocument": {
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"uri": uri,
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"languageId": language_id,
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"version": version,
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"text": text
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}
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}))
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}
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#[allow(dead_code)]
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pub fn did_change(&mut self, uri: &str, version: i32, text: &str) -> anyhow::Result<()> {
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self.notify("textDocument/didChange", json!({
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"textDocument": {
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"uri": uri,
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"version": version
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},
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"contentChanges": [{
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"text": text
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}]
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}))
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}
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pub fn did_close(&mut self, uri: &str) -> anyhow::Result<()> {
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self.notify("textDocument/didClose", json!({
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"textDocument": {
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"uri": uri
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}
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}))
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}
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pub fn hover(&mut self, uri: &str, line: u32, character: u32) -> anyhow::Result<Value> {
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self.call("textDocument/hover", json!({
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"textDocument": { "uri": uri },
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"position": { "line": line, "character": character }
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}))
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}
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pub fn completion(&mut self, uri: &str, line: u32, character: u32) -> anyhow::Result<Value> {
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self.call("textDocument/completion", json!({
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"textDocument": { "uri": uri },
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"position": { "line": line, "character": character }
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}))
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}
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pub fn goto_definition(&mut self, uri: &str, line: u32, character: u32) -> anyhow::Result<Value> {
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self.call("textDocument/definition", json!({
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"textDocument": { "uri": uri },
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"position": { "line": line, "character": character }
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}))
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}
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pub fn references(&mut self, uri: &str, line: u32, character: u32) -> anyhow::Result<Value> {
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self.call("textDocument/references", json!({
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"textDocument": { "uri": uri },
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"position": { "line": line, "character": character },
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"context": {
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"includeDeclaration": true
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}
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}))
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}
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#[allow(dead_code)]
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pub fn document_symbols(&mut self, uri: &str) -> anyhow::Result<Value> {
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self.call("textDocument/documentSymbol", json!({
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"textDocument": { "uri": uri }
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}))
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}
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pub fn collect_diagnostics(
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&mut self,
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uri: &str,
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language_id: &str,
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text: &str,
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) -> anyhow::Result<Value> {
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self.did_open(uri, language_id, 1, text)?;
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let result = self.read_notification(
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"textDocument/publishDiagnostics",
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Duration::from_millis(LSP_DIAGNOSTICS_TIMEOUT_MS),
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);
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self.did_close(uri)?;
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match result {
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Ok(params) => Ok(params.get("diagnostics").cloned().unwrap_or_else(|| json!([]))),
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Err(e) => Err(e),
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}
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}
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pub fn shutdown(&mut self) -> anyhow::Result<()> {
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let _ = self.call_with_timeout("shutdown", json!({}), Duration::from_secs(5));
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let _ = self.notify("exit", json!({}));
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Ok(())
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}
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}
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impl Drop for LspClient {
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fn drop(&mut self) {
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let _ = self.notify("exit", json!({}));
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}
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}
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pub fn path_to_lsp_uri(path: &str) -> String {
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file_path_to_uri(path)
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}
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