如何遍历对象的 shell 数组并使用 jq 从 JSON 文件中删除它们？

Question

我正在尝试从 Slack 的 channels.json 文件中的 json 对象列表中清除非活动通道。我通过检查导出中频道目录中最后一条消息的时间戳并将非活动频道列表写入数组来获得非活动频道列表（定义为过去 90 天内未更新），因为此数据在json 对象本身。唯一的问题是我不知道如何安排它，以便在写入新的输出文件之前从输入中删除数组中的每个通道。请参阅下面我的函数代码中的missing something important here 注释。

这是我当前的功能。

exclude-inactive-channels () {
# Check for a valid argument
  if [ -z $1 ]; then
    echo "No arguments supplied."
    return 1
  elif [ $# -gt 1 ]; then
    echo "Too many arguments supplied."
    return 1
  elif [ ! -f $1 ]; then
    echo "File doesn't exist."
    return 1
  fi

  cutoff_epoch=$(gdate  -d "90 days ago" +'%s')
  inactive_channels=()
  for channel in $(jq -r '.[] | select(.is_archived == false) | .name' $1); do 
    if [[ -d $channel ]]; then
      last_post=$(ls -1 $channel |sort -n |tail -1 |awk -F'.' '{print $1}')
      last_post_epoch=$(gdate -d "$last_post" +'%s')
      if [[ $last_post_epoch -lt $cutoff_epoch ]]; then
          inactive_channels+=("$channel")
          echo -n "Removing $channel directory. Last post is $last_post."
          #rm -rf $channel
          echo -e "\033[0;32m[OK]\033[0m"
      fi
    fi
  done

  echo "Removing inactive channels from $1 and writing output to new-$1."
  for inactive_channel in ${inactive_channels[@]}; do
    # Next line is untested pseudo code
    jq -r '.[] | del(.name == $inactive_channel)' $1 #missing something important here
  done | jq -s > new-${1}

  echo "Replacing $1 with new-$1."
  # mv new-${1} $1
}

调用这个函数：

exclude-inactive-channels channels.json

示例输入：

[
  {
    "id": "",
    "name": "announcements",
    "created": 1500000000,
    "creator": "",
    "is_archived": false,
    "is_general": true,
    "members": [
      "",
  ],
    "pins": [
      {
        "id": "",
        "type": "C",
        "created": 1500000000,
        "user": "",
        "owner": ""
      },
      ],
    "topic": {
      "value": "",
      "creator": "",
      "last_set": 0
    },
    "purpose": {
      "value": "company wide announcements",
      "creator": "",
      "last_set": 1500000000
    }
  },
  {
    "id": "",
    "name": "general",
    "created": 1500000000,
    "creator": "",
    "is_archived": false,
    "is_general": true,
    "members": [
      "",
  ],
    "pins": [
      {
        "id": "",
        "type": "C",
        "created": 1500000000,
        "user": "",
        "owner": ""
      },
      ],
    "topic": {
      "value": "",
      "creator": "",
      "last_set": 0
    },
    "purpose": {
      "value": "general",
      "creator": "",
      "last_set": 1500000000
    }
  },
]

Answer 1

更有效的方法是一次性删除所有频道，而不是一次删除一个。

# you need to comment one of these out for out.json to not be an empty list
inactive_channels=(
  "announcements"
  "general"
)

jq --rawfile inactive_channel_stream <(printf '%s\0' "${inactive_channels[@]}") '
  # generate an object mapping keys to delete to a truthy value
  INDEX($inactive_channel_stream | split("\u0000")[]; .) as $inactive_channels

  | map(select(($inactive_channels[.name] // false) | not))
' <in.json >out.json