buddymon/hooks-handlers/session-stop.sh
pyr0ball c85bade62f feat: per-session buddy isolation via PGRP-keyed state files
Each Claude Code session now gets its own state file at:
  ~/.claude/buddymon/sessions/<pgrp>.json

Contains: buddymon_id, session_xp, challenge — all session-local.
Global active.json keeps the default buddymon_id for new sessions.

/buddymon assign writes to the session file only, so assigning in one
terminal window doesn't affect other open sessions. Each window can
have its own buddy assigned independently.

SessionStart creates the session file (inheriting global default).
SessionStop reads XP from it, writes to roster, then removes it.
2026-04-02 23:11:19 -07:00

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#!/usr/bin/env bash
# Buddymon Stop hook — tally session XP, check challenge, print summary
PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-$(dirname "$(dirname "$(realpath "$0")")")}"
source "${PLUGIN_ROOT}/lib/state.sh"
buddymon_init
SESSION_KEY=$(python3 -c "import os; print(os.getpgrp())")
SESSION_FILE="${BUDDYMON_DIR}/sessions/${SESSION_KEY}.json"
ACTIVE_ID=$(python3 -c "
import json, sys
try:
d = json.load(open('${SESSION_FILE}'))
print(d.get('buddymon_id', ''))
except Exception:
print('')
" 2>/dev/null)
SESSION_XP=$(python3 -c "
import json, sys
try:
d = json.load(open('${SESSION_FILE}'))
print(d.get('session_xp', 0))
except Exception:
print(0)
" 2>/dev/null)
if [[ -z "${ACTIVE_ID}" ]] || [[ "${SESSION_XP}" -eq 0 ]]; then
[[ -f "${SESSION_FILE}" ]] && rm -f "${SESSION_FILE}"
exit 0
fi
# Load catalog for display info
CATALOG="${PLUGIN_ROOT}/lib/catalog.json"
SUMMARY=$(python3 << PYEOF
import json, os
catalog_file = '${CATALOG}'
session_state_file = '${SESSION_FILE}'
roster_file = '${BUDDYMON_DIR}/roster.json'
session_file = '${BUDDYMON_DIR}/session.json'
catalog = json.load(open(catalog_file))
session_state = json.load(open(session_state_file))
roster = json.load(open(roster_file))
session = {}
try:
session = json.load(open(session_file))
except Exception:
pass
buddy_id = session_state.get('buddymon_id')
if not buddy_id:
print('')
exit()
b = (catalog.get('buddymon', {}).get(buddy_id)
or catalog.get('evolutions', {}).get(buddy_id) or {})
display = b.get('display', buddy_id)
xp_earned = session_state.get('session_xp', 0)
level = roster.get('owned', {}).get(buddy_id, {}).get('level', 1)
total_xp = roster.get('owned', {}).get(buddy_id, {}).get('xp', 0)
xp_needed = level * 100
# Check level up
leveled_up = False
new_level = level
while total_xp >= new_level * 100:
new_level += 1
leveled_up = True
if leveled_up:
# Save new level
roster['owned'][buddy_id]['level'] = new_level
json.dump(roster, open(roster_file, 'w'), indent=2)
# Session stats
commits = session.get('commits_this_session', 0)
tools = session.get('tools_used', 0)
langs = session.get('languages_seen', [])
challenge_completed = session.get('challenge_completed', False)
challenge = session_state.get('challenge')
lines = [f"\n## 🐾 Session complete — {display}"]
lines.append(f"**+{xp_earned} XP earned** this session")
if commits:
lines.append(f" · {commits} commit{'s' if commits != 1 else ''}")
if langs:
lines.append(f" · New languages: {', '.join(langs)}")
if leveled_up:
lines.append(f"\n✨ **LEVEL UP!** {display} is now Lv.{new_level}!")
# Check if evolution is now available
catalog_entry = (catalog.get('buddymon', {}).get(buddy_id)
or catalog.get('evolutions', {}).get(buddy_id) or {})
evolutions = catalog_entry.get('evolutions', [])
evo = next((e for e in evolutions if new_level >= e.get('level', 999)), None)
if evo:
into = catalog.get('evolutions', {}).get(evo['into'], {})
lines.append(f"\n⭐ **EVOLUTION READY!** {display} can evolve into {into.get('display', evo['into'])}!")
lines.append(f" Run `/buddymon evolve` to prestige — resets to Lv.1 with upgraded stats.")
else:
filled = min(20, total_xp * 20 // xp_needed)
bar = '█' * filled + '░' * (20 - filled)
lines.append(f"XP: [{bar}] {total_xp}/{xp_needed}")
# Remind if already at evolution threshold but hasn't evolved yet
catalog_entry = (catalog.get('buddymon', {}).get(buddy_id)
or catalog.get('evolutions', {}).get(buddy_id) or {})
evolutions = catalog_entry.get('evolutions', [])
evo = next((e for e in evolutions if level >= e.get('level', 999)), None)
if evo:
into = catalog.get('evolutions', {}).get(evo['into'], {})
lines.append(f"\n⭐ **Evolution available:** `/buddymon evolve` → {into.get('display', evo['into'])}")
if challenge:
if challenge_completed:
lines.append(f"\n🏆 **Challenge complete:** {challenge.get('name','?')} — bonus XP awarded!")
else:
lines.append(f"\n⏳ Challenge in progress: {challenge.get('name','?')}")
print('\n'.join(lines))
PYEOF
)
# Clean up this session's state file — each session is ephemeral
rm -f "${SESSION_FILE}"
# Reset shared session.json for legacy compatibility
buddymon_session_reset
SUMMARY_JSON=$(python3 -c "import json,sys; print(json.dumps(sys.argv[1]))" "${SUMMARY}" 2>/dev/null)
[[ -z "${SUMMARY_JSON}" ]] && SUMMARY_JSON='""'
cat << EOF
{"systemMessage": ${SUMMARY_JSON}}
EOF
exit 0