Notify on Slack when new channel is created

new_channel_notification.js

/*
Libraries
- SlackApp: M3W5Ut3Q39AaIwLquryEPMwV62A3znfOO
- Underscore: MGwgKN2Th03tJ5OdmlzB8KPxhMjh3Sh48
- Moment: MHMchiX6c1bwSqGM1PZiW_PxhMjh3Sh48

Usage
- Create sheet named "Channel List", then paste this script on script editor.
*/

var _ = Underscore.load();

var TOKEN = "YOUR-SLACK-TOKEN";
var CHANNEL_NAME = "lobby";
var SHEET_NAME = "Channel List";
var ADDITIONAL_MESSAGE = "新しく作成されたチャンネルがあります。 "

function getChannelId(slackApp, name) {
  var channel = _.findWhere(slackApp.channelsList().channels, {name: name});
  if (_.isEmpty(channel)) {
    throw new Error(name + " is not found");
  }
  return channel.id
}

function postMessage(slackApp, message) {
  var channelId = getChannelId(slackApp, CHANNEL_NAME);
  
  slackApp.chatPostMessage(channelId, message, {
    username : "bot",
    icon_emoji : ":new:"
  });
}

function main() {
  var slackApp = SlackApp.create(TOKEN);
  var current_channels = _.pluck(slackApp.channelsList().channels, 'name');
  
  var message = '';
  var sheet = SpreadsheetApp.getActive().getSheetByName(SHEET_NAME);
  var rows = _.map(sheet.getDataRange().getValues(), function(elm){ return elm.toString(); });
  
  _.each(current_channels, function(channel, i) {
    if (!_.include(rows, channel)) {
      message += " #" + channel;
    }
  });
  
  //if (message) Logger.log(ADDITIONAL_MESSAGE + message)
  if (message) postMessage(slackApp, ADDITIONAL_MESSAGE + message);
  
  _.each(current_channels, function(channel, i) {
    sheet.getRange('A' + (i+1)).setValue(channel);
  });
}