i3-workspace-watcher.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'i3-ipc'

i3 = I3::IPC.new

def process(data)
  data.each do |ws|
    if ws["focused"] 
      writeScript ws["name"]
    else
      next
    end
  end
end

def writeScript(name)
  File.open('/home/me/.scripts/gv', 'w') do |f|
    f.puts("#!/usr/bin/env zsh\ngvim --servername #{name} --remote-tab-silent $1")
  end
end

I3::IPC.subscribe [:workspace] do |em, type, data|
  case type
  when I3::IPC::MESSAGE_REPLY_GET_WORKSPACES
    process(data)
  when I3::IPC::EVENT_WORKSPACE
    em.send_data I3::IPC.format(I3::IPC::MESSAGE_TYPE_GET_WORKSPACES)
  end
end