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This commit fixes all identified functionality bugs and adds comprehensive test coverage to prevent regressions. ## Bugs Fixed: **Fix #1: Exit code extraction no longer contaminates output buffer** - Modified execute_command to save buffer before extracting exit code - Created async _extract_exit_code_async method that doesn't pollute output - Exit code extraction now uses separate buffer that gets discarded **Fix sdevare-nv#2: Race conditions prevented with proper locking** - Added async lock to execute_command method - Prevents concurrent command execution on same session - Ensures output from different commands doesn't get mixed **Fix sdevare-nv#3: NameError in create_session error handling fixed** - Initialize master_fd and process variables before try block - Prevents NameError if exception occurs before PTY creation - Also added process cleanup in error handler **Fix sdevare-nv#4: Robust prompt detection with custom marker** - Replaced brittle regex patterns ([$#>]$) with unique marker - Set custom PS1 with PROMPT_MARKER after shell initialization - Commands outputting $, #, or > no longer cause false timeouts - Added _clean_output method to remove markers from user-visible output **Fix sdevare-nv#5: Process state validation added** - Check if shell process is still alive before executing commands - Prevents hangs when process has crashed or been killed externally - Added same check to send_input method **Fix sdevare-nv#6: Buffer clearing timing issues resolved** - Read and discard stale output before clearing buffers - Prevents output from previous commands contaminating current command - Fixed rapid successive command execution **Fix sdevare-nv#7: Thread-safe singleton pattern implemented** - Added async lock for get_session_manager_async - Created separate sync version for backward compatibility - Prevents race conditions in manager initialization **Fix sdevare-nv#8: Complete resource cleanup on errors** - Kill and wait for process in error handler - Close file descriptors even if process creation fails - No more zombie processes or fd leaks **Fix sdevare-nv#9: Blocking sleep replaced with async sleep** - Changed time.sleep to await asyncio.sleep in _extract_exit_code_async - Prevents blocking the event loop - Improved async performance ## Additional Improvements: - Enhanced ANSI escape code handling in exit code extraction - Added support for CSI sequences with ? character - Improved regex to handle terminal control sequences - Better exit code parsing for all edge cases ## Test Coverage: Added comprehensive test suite (test_terminus_bugfixes.py) with 12 tests: - 7 tests for specific bug fixes - 5 tests for previously uncovered scenarios: * Concurrent command execution * Rapid successive commands * Environment persistence * Exit code accuracy * Multi-line output handling All 12 tests pass successfully. ## Tested Scenarios: ✅ Exit code extraction doesn't contaminate subsequent commands ✅ Concurrent commands are properly serialized ✅ Error handling doesn't raise NameError ✅ Commands with prompt-like output ($, #, >) don't timeout ✅ Dead process detection works correctly ✅ Rapid successive commands don't mix output ✅ Resource cleanup is complete even on errors ✅ Environment variables persist across commands ✅ Exit codes (0, 1, custom) are captured accurately ✅ Multi-line command output is preserved Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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