python-lsp-server

import subprocess import sys import os import time import shutil # The Python LSP Server is primarily meant to be run as a separate process # and communicated with via stdin/stdout using the Language Server Protocol. # This example shows how to launch it programmatically for testing or custom integration. print("Launching python-lsp-server in a subprocess...") try: # Using `sys.executable -m pylsp` ensures the correct Python environment is used. # We redirect stdout/stderr to pipes to prevent it from blocking the console. # For real use, stdout would carry LSP messages to a client. process = subprocess.Popen( [sys.executable, '-m', 'pylsp', '--log-level', 'WARNING'], # Adjust log-level as needed stdin=subprocess.PIPE, # Server expects LSP messages here stdout=subprocess.PIPE, # Server sends LSP messages here stderr=subprocess.PIPE, # Server logs errors/debug info here text=True, # Handle stdin/stdout as text bufsize=0 # Unbuffered I/O for real-time LSP communication ) print("Server process started.") print("It is now listening for LSP messages on stdin and sending responses on stdout.") print("This process will block waiting for input unless a client sends messages.") print("Waiting for 2 seconds to simulate runtime...") time.sleep(2) # In a real scenario, you would send JSON-RPC LSP messages here, e.g., # process.stdin.write('Content-Length: ...\r\n\r\n{"jsonrpc": "2.0", ...}\r\n') # process.stdin.flush() print("Attempting to terminate the server.") process.terminate() # Send SIGTERM (or equivalent on Windows) stdout, stderr = process.communicate(timeout=5) # Wait for it to exit and get output print(f"\nServer exit code: {process.returncode}") if stdout: print("\n--- Server STDOUT (LSP messages) ---") print(stdout.strip()) if stderr: print("\n--- Server STDERR (Logs/Errors) ---") print(stderr.strip()) except FileNotFoundError: print(f"Error: `pylsp` command or `sys.executable` not found. Is python-lsp-server installed?") except subprocess.TimeoutExpired: print("Server did not terminate gracefully within the timeout. Killing it.") process.kill() stdout, stderr = process.communicate() except Exception as e: print(f"An error occurred: {e}") finally: print("Quickstart demonstration complete.")