process-status-monitor.sh

#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=shared/hooks/wavemill-hook-protocol.sh
source "$SCRIPT_DIR/wavemill-hook-protocol.sh"

wavemill_hook_check

# Fallback status monitor for agent CLIs without hooks or structured event
# streams. If the tmux pane's foreground shell has active descendants, the agent
# is considered working; otherwise it is idle.

agent_pid="${1:-}"
exit_file="${2:-}"
poll_interval="${WAVEMILL_PROCESS_STATUS_POLL_INTERVAL:-2}"

[[ -n "$agent_pid" ]] || exit 1

# Initial state
wavemill_hook_write "working" "process_start" "pid:$agent_pid" "generic"

while kill -0 "$agent_pid" 2>/dev/null; do
  if [[ -n "$exit_file" && -f "$exit_file" ]]; then
    exit_code=$(tr -d '[:space:]' < "$exit_file" 2>/dev/null || echo "0")
    if [[ "${exit_code:-0}" -ne 0 ]]; then
      wavemill_hook_write "error" "process_exit_failure" "exit_code:$exit_code" "generic"
    else
      wavemill_hook_write "idle" "process_exit" "" "generic"
    fi
    exit 0
  fi

  child_count=$(pgrep -P "$agent_pid" 2>/dev/null | wc -l | tr -d ' ')
  if (( child_count > 0 )); then
    wavemill_hook_write "working" "process_active" "children:$child_count" "generic"
  else
    wavemill_hook_write "idle" "process_idle" "" "generic"
  fi
  sleep "$poll_interval"
done

# Shell process exited entirely. Prefer the wrapped exit code when available.
if [[ -n "$exit_file" && -f "$exit_file" ]]; then
  exit_code=$(tr -d '[:space:]' < "$exit_file" 2>/dev/null || echo "0")
  if [[ "${exit_code:-0}" -ne 0 ]]; then
    wavemill_hook_write "error" "process_exit_failure" "exit_code:$exit_code" "generic"
  else
    wavemill_hook_write "idle" "process_exit" "" "generic"
  fi
else
  wavemill_hook_write "idle" "process_exit" "" "generic"
fi