---
phase: 03-execution-pipeline
plan: 01
subsystem: architecture
tags: [multi-file, module-structure, refactoring, python]

# Dependency graph
requires:
  - phase: 01-script-skeleton
    provides: "Initial gitsl.py with arg parsing and debug mode"
  - phase: 02-e2e-test-infrastructure
    provides: "E2E test harness for validation"
provides:
  - "Multi-file architecture with entry point, common utils, and command handlers"
  - "common.py with shared utilities (ParsedCommand, parse_argv, etc.)"
  - "cmd_status.py as template for all command handlers"
  - "run_sl stub for Plan 02 subprocess implementation"
affects: [03-02-subprocess-bridge, 04-command-translation]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Handler interface: cmd_*.py with handle(ParsedCommand) -> int"
    - "Shared utilities in common.py"
    - "Entry point dispatch in gitsl.py"

key-files:
  created:
    - common.py
    - cmd_status.py
  modified:
    - gitsl.py

key-decisions:
  - "Handler interface: handle(ParsedCommand) -> int for all command handlers"
  - "run_sl stub returns 0 and prints message for Plan 02 implementation"

patterns-established:
  - "cmd_*.py: One file per git command with handle() function"
  - "common.py: All shared utilities imported from here"
  - "gitsl.py: Entry point only, no command logic"

# Metrics
duration: 2min
completed: 2026-01-18
---

# Phase 3 Plan 01: Multi-file Architecture Summary

**Refactored gitsl.py from monolithic 125-line script to 3-file architecture with entry point, shared utilities, and command handler template**

## Performance

- **Duration:** 2 min
- **Started:** 2026-01-18T03:14:02Z
- **Completed:** 2026-01-18T03:16:29Z
- **Tasks:** 3
- **Files modified:** 3

## Accomplishments
- Created common.py with all shared utilities (ParsedCommand, parse_argv, debug functions, VERSION)
- Created cmd_status.py as the template for all future command handlers
- Reduced gitsl.py from 125 lines to 62 lines (50% reduction)
- Added run_sl stub function ready for Plan 02 subprocess implementation

## Task Commits

Each task was committed atomically:

1. **Task 1: Create common.py with shared utilities** - `1e173a2` (feat)
2. **Task 2: Create cmd_status.py handler** - `6f3139a` (feat)
3. **Task 3: Refactor gitsl.py to entry-point-only** - `0425449` (refactor)

## Files Created/Modified
- `common.py` - Shared utilities: ParsedCommand, parse_argv, is_debug_mode, print_debug_info, run_sl, VERSION
- `cmd_status.py` - Handler for status command, template for all cmd_*.py files
- `gitsl.py` - Entry point only with command dispatch (reduced from 125 to 62 lines)

## Decisions Made
- **Handler interface:** `handle(parsed: ParsedCommand) -> int` - All command handlers follow this signature
- **run_sl stub:** Prints `[STUB] Would run: sl {args}` and returns 0, ready for Plan 02 to implement real subprocess execution

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

- **pytest tests:** 2 tests failed due to pre-existing environment issue (tests use `python` instead of `python3`). This is unrelated to the refactoring - 33/35 tests passed, confirming no regressions from this work.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Multi-file architecture complete, ready for Plan 02 (subprocess bridge)
- cmd_status.py template established for adding more command handlers
- run_sl stub ready to be replaced with real subprocess.run implementation
- All existing behaviors preserved (--version, --help, empty args, debug mode)

---
*Phase: 03-execution-pipeline*
*Completed: 2026-01-18*
