'How to get the history index of a client in a tag

How do I get the client history order?

I have a table with all my clients

local clientsInTag = { [1]=client1, [2]=client2, [3]=client3 }

I want to focus it according to the history

awful.focus = clientsInTag[historyIndex]

Also how does the history index change when adding multiple tags with awful.tag.viewtoggle(tag)?

awesome-wm

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