awesomewm/core/layouts/layoutmanager.lua

local LayoutManager = {}

-- screen.layouts, awful.layouts, and tag.layouts are all ignored.
-- This module replaces the standard layout functions.




-- Get group from layout
-- We assume that this layout is in config.core.layouts
function LayoutManager:get_group(layout)
	for k, v in pairs(config.core.layouts) do
		for l, m in pairs(v) do
			if (layout == m) then
				return k
			end
		end
	end
end

function LayoutManager:get_alt(layout)
	for k, v in pairs(config.core.layouts) do
		for l, m in pairs(v) do
			if (layout == m) then
				return l
			end
		end
	end
end



function LayoutManager:default_layout()
	return config.core.layouts[1][1]
end

-- Change layout group
function LayoutManager:group(step)
	local s = awful.screen.focused()
	local tag = s.selected_tag	-- Multiple selected tags are NOT supported!
	local layout = tag.layout

	-- Subtract 1, 'cuz lua doesn't start at 0
	local group = self:get_group(layout) - 1


	group = ((group + step) % #config.core.layouts) + 1

	awful.layout.set(config.core.layouts[group][1], tag)
end

-- Change layout alternate
function LayoutManager:alt(step)
	local s = awful.screen.focused()
	local tag = s.selected_tag	-- Multiple selected tags are NOT supported!
	local layout = tag.layout

	-- Subtract 1, 'cuz lua doesn't start at 0
	local alt = self:get_alt(layout) - 1
	local group = self:get_group(layout)


	alt = ((alt + step) % #config.core.layouts[group]) + 1

	awful.layout.set(config.core.layouts[group][alt], tag)
end

function LayoutManager:next()
	self:group(1)
end
function LayoutManager:prev()
	self:group(-1)
end
function LayoutManager:next_alt()
	self:alt(1)
end
function LayoutManager:prev_alt()
	self:alt(-1)
end

return LayoutManager