OctoPrintを接続した3Dプリンターの動作状況をmacOS用アプリBitBarを使ってステータスバーに表示するRubyスクリプト

BitBar-OctoPrint.rb

#!/usr/local/opt/ruby/bin/ruby

require 'open-uri'
require 'json'
require 'time'

OCTPRINT_IP = "192.168.1.33"
HEADER = "[C]"

begin
  r = open("http://#{OCTPRINT_IP}/api/job", open_timeout: 1, read_timeout: 1)
  json = JSON.parse(r.read())
  if ((json["state"] =~ /^Offline/) != nil) then
    mes = "オフライン"
  elsif (json["state"] == "Operational") then
    mes = "待機中"
  elsif (json["state"] == "Connecting") then
    mes = "接続中"
  elsif (json["state"] == "Printing") then
    # 印刷中
    if (json["progress"]["completion"] != nil) then
      completion = json["progress"]["completion"].round(2).to_s + "%"
    else
      completion = "-%"
    end

    if (json["progress"]["printTimeLeft"] != nil) then
      printTimeLeft = json["progress"]["printTimeLeft"]
      if (printTimeLeft == 0) then
        printTimeLeft = "-%"
      else
        printTimeLeft = Time.at(printTimeLeft).utc.strftime('%X') 
      end
    else
      # まだ残り時間が算出されていない
      printTimeLeft = "計算中"
    end
    mes = "#{completion} / #{printTimeLeft}"
  end
rescue => exception
  mes = "接続不能"
end

puts "#{HEADER}#{mes}"

BitBar: https://github.com/matryer/bitbar
OctoPrint: https://octoprint.org