ruby-gmailを使ってGmailの重要な未読メールの件数を知る

sudo gem install ruby-gmail pit mime

Pitの設定

ruby -e 'require "pit";Pit.set("google", :data=>{"username"=>"yuiseki", "password"=>"kogaidan"})'

gmail.rb

#!/usr/bin/env ruby
require 'pit'
require 'gmail'

config = Pit.get('google')
gmail = Gmail.new(config['username'], config['password'])
important_and_unread = gmail.mailbox('[Gmail]/Important').count(:unread)
puts important_and_unread

ワンライナー

ruby -e 'require"pit"; require"gmail"; g=Pit.get("google"); p Gmail.new(g["name"], g["pass"]).label("[Gmail]/Important").count(:unread)'