Example of openaps devices, reports, and aliases you'll need to modify to run the advanced-meal-assist branch of oref0.

advanced-meal-assist.json

[
  {
    "extra": {
      "fields": "pumphistory profile clock carbs glucose basal",
      "cmd": "oref0",
      "args": "meal"
    },
    "type": "device",
    "name": "meal",
    "meal": {
      "vendor": "openaps.vendors.process",
      "extra": "meal.ini"
    }
  },
  {
    "type": "report",
    "name": "monitor/meal.json",
    "monitor/meal.json": {
      "profile": "settings/profile.json",
      "carbs": "monitor/carbhistory.json",
      "clock": "monitor/clock-zoned.json",
      "reporter": "text",
      "json_default": "True",
      "use": "shell",
      "pumphistory": "monitor/pumphistory-zoned.json",
      "basal": "settings/basal_profile.json",
      "device": "meal",
      "remainder": "[]",
      "glucose": "monitor/glucose.json"
    }
  },
  {
    "gather": {
      "command": "! bash -c \"rm monitor/*; ( openaps get-bg | egrep \\\"reporting|Copied\\\" && echo -n R && openaps report invoke monitor/status.json 2>/dev/null >/dev/null && echo -n e && test $(cat monitor/status.json | json bolusing) == false && echo -n fr && openaps ns-meal-carbs && echo -n esh && ( (openaps monitor-pump || openaps monitor-pump) >/dev/null && echo ed ) || (echo; sleep 60; exit 1)) 2>/dev/null\""
    },
    "type": "alias",
    "name": "gather"
  },
  {
    "ns-meal-carbs": {
      "command": "! bash -c \"curl -m 30 -s \\\"$NIGHTSCOUT_HOST/api/v1/treatments.json?find\\[created_at\\]\\[\\$gte\\]=`date -d \\\"3 hours ago\\\" -Iminutes`&find\\[carbs\\]\\[\\$exists\\]=true\\\" > monitor/carbhistory.json; exit 0\""
    },
    "type": "alias",
    "name": "ns-meal-carbs"
  }
]