---
phase: 02-daemon-et-i3-bridge
plan: 02
subsystem: i3-bridge
tags: [i3, x11, ppid, workspace, fuzzy-match, xgbutil, ewmh]

requires:
  - phase: 01-session-discovery
    provides: "Process struct, FindClaudeProcesses, /proc scanning pattern"
provides:
  - "PPID chain walk (ReadPPID, ResolveWorkspace)"
  - "Terminal-workspace map via i3 tree + X11 _NET_WM_PID (BuildTerminalWorkspaceMap)"
  - "Fuzzy match sessions by label/branch/cwd (FuzzyMatch)"
  - "Switch workspace via i3 IPC (SwitchToWorkspace)"
  - "Interfaces I3TreeProvider, X11PIDResolver, I3Commander pour testabilite"
affects: [02-daemon-et-i3-bridge/02-03, 03-hooks]

tech-stack:
  added: [go.i3wm.org/i3/v4, BurntSushi/xgbutil, BurntSushi/xgb]
  patterns: [interface-based i3/X11 abstraction for testing, PPID chain walk with depth limit]

key-files:
  created: [workspace.go, workspace_test.go, i3bridge.go, i3bridge_test.go, x11_resolver.go]
  modified: [go.mod, go.sum]

key-decisions:
  - "X11PIDResolver interface pour abstraire ewmh.WmPidGet et tester sans serveur X11"
  - "I3TreeProvider interface pour mocker i3.GetTree dans les tests"
  - "maxPPIDDepth = 20 pour securiser la remontee de chaine PPID"
  - "Priorite fuzzy match : label > branche > cwd (label plus intentionnel)"

patterns-established:
  - "Interface injection pour i3 et X11 : meme pattern que procDir injectable en Phase 1"
  - "walkI3Tree recursif avec tracking du workspace courant"

requirements-completed: [I3-01, I3-02]

duration: 4min
completed: 2026-03-23
---

# Phase 02 Plan 02: i3 Bridge Summary

**Mapping PID-workspace via PPID chain + X11 _NET_WM_PID, fuzzy match label/branche/cwd, switch workspace i3 IPC**

## Performance

- **Duration:** 4 min
- **Started:** 2026-03-23T16:41:16Z
- **Completed:** 2026-03-23T16:45:53Z
- **Tasks:** 2
- **Files modified:** 7

## Accomplishments
- Resolution PID Claude -> workspace i3 via chaine PPID (ReadPPID + ResolveWorkspace)
- Construction de la map terminal-workspace en combinant i3 GetTree et X11 _NET_WM_PID
- Fuzzy match case-insensitive avec priorite label > branche > cwd
- Switch workspace via i3 IPC avec gestion d'erreurs
- 15 tests couvrant tous les cas (depth limit, not found, priorite, case-insensitive, erreurs i3)

## Task Commits

Each task was committed atomically:

1. **Task 1: PPID chain walk + workspace resolution**
   - `c9a28df` (test: failing tests for ReadPPID, ResolveWorkspace, BuildTerminalWorkspaceMap)
   - `a2fb37e` (feat: implement workspace resolution + X11 resolver)
2. **Task 2: Fuzzy match + switch workspace + i3 client interface**
   - `4a298d5` (test: failing tests for FuzzyMatch, SwitchToWorkspace)
   - `9427dd3` (feat: implement fuzzy match + switch workspace)

## Files Created/Modified
- `workspace.go` - ReadPPID, ResolveWorkspace, BuildTerminalWorkspaceMap, interfaces I3TreeProvider/X11PIDResolver
- `workspace_test.go` - 6 tests : ReadPPID, ResolveWorkspace (chain, not found, max depth), BuildTerminalWorkspaceMap
- `i3bridge.go` - FuzzyMatch, SwitchToWorkspace, interfaces I3Commander, RealI3Commander
- `i3bridge_test.go` - 9 tests : fuzzy match (label, branch, cwd, priority, no result, case), switch workspace (ok, error, i3 error)
- `x11_resolver.go` - RealX11Resolver avec xgbutil/ewmh pour production
- `go.mod` - Ajout go.i3wm.org/i3/v4 + deps transitives (xgb, xgbutil)
- `go.sum` - Hashes des nouvelles deps

## Decisions Made
- X11PIDResolver et I3TreeProvider comme interfaces pour tester sans X11/i3
- windowID en int64 (alignement avec le type Window du Node i3)
- walkI3Tree parcourt aussi les FloatingNodes pour ne pas rater de fenetres flottantes
- maxPPIDDepth = 20 contre les boucles de PPID (securite)

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Fix unused imports in daemon.go**
- **Found during:** Task 1 (build verification)
- **Issue:** daemon.go importait fmt et net sans les utiliser (etat intermediaire du plan 02-01 parallele)
- **Fix:** Retrait des imports inutilises
- **Files modified:** daemon.go
- **Verification:** `go build ./...` passe
- **Note:** L'agent parallele 02-01 a ensuite ajoute du code qui utilise ces imports, rendant le fix obsolete

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Fix necessaire pour que le build passe. Aucun impact sur le scope.

## Issues Encountered
- Tests daemon_test.go (plan 02-01) echouent (TestDaemonListOverSocket, TestDaemonLabelOverSocket) mais hors scope de ce plan. Tests 02-02 passent tous avec -race.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- workspace.go et i3bridge.go sont prets pour integration dans le daemon (plan 02-03)
- Le daemon pourra utiliser `BuildTerminalWorkspaceMap` + `ResolveWorkspace` comme workspaceResolver
- `FuzzyMatch` + `SwitchToWorkspace` seront cables sur l'action "switch" du socket

## Known Stubs
None - all functions are fully implemented with real logic.

---
*Phase: 02-daemon-et-i3-bridge*
*Completed: 2026-03-23*

## Self-Check: PASSED
All files found. All commit hashes verified.