Standup service that is extendible on input and output (i.e. GitHub, Jira, and Trello for input with Slack and Email for output)

input.rb

class InputProvider
  def pull; end
end

class ManualInputProvider
  def pull; end
end

output.rb

class OutputProvider
  def push; end
end

class SlackOutputProvider
  # see https://github.com/slack-ruby/slack-ruby-client
  require 'slack-ruby-client'

  attr_reader :channel
  
  def initialize(channel)
    @channel = channel
  end
  
  def push(standup)
    client.chat_postMessage(channel: channel, attachments: attachments)
  end
  
  # see https://api.slack.com/docs/messages/builder?msg=%7B%22attachments%22%3A%5B%7B%22fallback%22%3A%22Required%20plain-text%20summary%20of%20the%20attachment.%22%2C%22color%22%3A%22%2336a64f%22%2C%22pretext%22%3A%22Optional%20text%20that%20appears%20above%20the%20attachment%20block%22%2C%22author_name%22%3A%22Bobby%20Tables%22%2C%22author_link%22%3A%22http%3A%2F%2Fflickr.com%2Fbobby%2F%22%2C%22author_icon%22%3A%22http%3A%2F%2Fflickr.com%2Ficons%2Fbobby.jpg%22%2C%22title%22%3A%22Slack%20API%20Documentation%22%2C%22title_link%22%3A%22https%3A%2F%2Fapi.slack.com%2F%22%2C%22text%22%3A%22Optional%20text%20that%20appears%20within%20the%20attachment%22%2C%22fields%22%3A%5B%7B%22title%22%3A%22Priority%22%2C%22value%22%3A%22High%22%2C%22short%22%3Afalse%7D%5D%2C%22image_url%22%3A%22http%3A%2F%2Fmy-website.com%2Fpath%2Fto%2Fimage.jpg%22%2C%22thumb_url%22%3A%22http%3A%2F%2Fexample.com%2Fpath%2Fto%2Fthumb.png%22%2C%22footer%22%3A%22Slack%20API%22%2C%22footer_icon%22%3A%22https%3A%2F%2Fplatform.slack-edge.com%2Fimg%2Fdefault_application_icon.png%22%2C%22ts%22%3A123456789%7D%5D%7D
  AttachmentMapper = Struct.new(standup) do
    def attachments
      attachments = []
      attachments << { title: 'Yesterday', text: standup.to_bullet_s }
      attachments << { title: 'Today', text: standup.to_bullet_s }
      attachments << { title: 'Blockers', text: standup.to_bullet_s }
      attachments
    end
  end
end

standup.rb

class Standup
  attr_reader :yesterday, :today, :blockers
end