Hammerspoon code to extract a caller's number and issue a ddg search.

misc_fn.lua

local char_to_hex = function(c)
  return string.format("%%%02X", string.byte(c))
end

local function urlencode(url)
  if url == nil then
    return
  end
  url = url:gsub("\n", "\r\n")
  url = url:gsub("([^%w ])", char_to_hex)
  url = url:gsub(" ", "+")
  return url
end

-- ** Find a caller's info before picking up a call
function misc_fn.findCallerId()
   local rc, retobj, notification_string, phone_number

   rc, retobj, notification_string = hs.osascript.applescript([[
-- display notification "from unknown number,  +1 (480) 555-1234" 
-- delay 1

tell application "System Events" to ¬
	if exists window 1 of ¬
		process "Notification Center" then ¬
		get value of ¬
			static text of ¬
            group 1 of UI element 1 of ¬
            scroll area 1 of ¬
			window 1 of ¬
			process "Notification Center"
    ]])

   -- notification_string should end with a phone-number.
   if (rc) then
      print("Notification: ", notification_string, #(notification_string))
      if (#(retobj) >= 3) then
         phone_number = retobj[3]
      else
         if (#(retobj) == 1) then
            phone_number = retobj[1]
         end
      end

   --   print("Obj:: ", retobj, #(retobj))
   --   print("Phone_number: ", phone_number)  -- print the last entry of the return object

   end

   -- split the phone_number string on ,
   local w
   local words = {}
   
   for w in phone_number:gmatch("[^,]+") do
      table.insert(words, w)
   end
   -- print (words[#(words)])  -- finally, this is the phone number!

   local url = 'http://duckduckgo.com/?q=' .. urlencode(words[#(words)])
   local shell_cmd = "open " .. url
   print (shell_cmd)
   hs.execute(shell_cmd)
end