---------------------------------------------------------------------------
-- @author Uli Schlachter <psychon@znc.in>
-- @copyright 2009 Uli Schlachter
-- @copyright 2008 Julien Danjou
-- @release @AWESOME_VERSION@
---------------------------------------------------------------------------

-- Grab environment we need
local ipairs = ipairs

module("awful.layout.suit.spiral")

local function spiral(p, dwindle)
    local wa = p.workarea
    local cls = p.clients

    local i = 0
    local n = #cls
    local nx = wa.x
    local ny = wa.y
    local nw = wa.width
    local nh = wa.height

    for k, c in ipairs(cls) do
        if (i % 2 == 1 and nh / 2 > 2 * c.border_width)
              or (i % 2 == 0 and nw / 2 > 2 * c.border_width) then
            if i < n - 1 then
                if i % 2 == 1 then
                    nh = nh / 2
                else
                    nw = nw / 2
                end
                if i % 4 == 2 and not dwindle then
                    nx = nx + nw
                elseif i % 4 == 3 and not dwindle then
                    ny = ny + nh
                end
            end
            if i % 4 == 0 then
                if dwindle then
                    ny = ny + nh
                else
                    ny = ny - nh
                end
            elseif i % 4 == 1 then
                nx = nx + nw
            elseif i % 4 == 2 then
                ny = ny + nh
            elseif i % 4 == 3 then
                if dwindle then
                    nx = nx + nw
                else
                    nx = nx - nw
                end
            end
            if i == 0 then
                ny = wa.y
            end
            i = i + 1
        end
        local geom = { x = nx, y = ny, width = nw, height = nh }
        c:geometry(geom)
    end
end

--- Dwindle layout
dwindle = {}
dwindle.name = "dwindle"
function dwindle.arrange(p)
    return spiral(p, true)
end

--- Spiral layout
name = "spiral"
function arrange(p)
    return spiral(p, false)
end

-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80