awesome-swap-back-and-forth.lua

-- Generic back and forth switching between master and client. {{{
-- Bind it like this:
-- awful.key({ modkey, "Control" }, "Return", function (c) my_swap_back_and_forth.run(c, awful.client.getmaster) end),
local my_swap_back_and_forth = {
    previous_by_tag_and_f = {}
}
my_swap_back_and_forth.run = function (c, swapf)
    local f = swapf or awful.client.getmaster

    local prev = my_swap_back_and_forth.previous_by_tag_and_f
    if not prev.tag then
        prev.tag = {}
    end

    local swap_with = f()
    local tag = c:tags()[1]

    if c == swap_with then
        if prev.tag.f then
            swap_with = prev.tag.f
        else
            bnote("No previous client to swap with.")
            return
        end
    end
    prev.tag.f = swap_with
    c:swap(swap_with)
end
-- }}}