Custom layout for Awesome WM with triple vertical screen

horiz3.lua

local math = math

local horiz3 = {
  name = "horiz3"
}

function split_horizontal(g)
  g.width = g.width / 2
  return {
    x = g.x + g.width,
    y = g.y,
    width = g.width,
    height = g.height,
  }
end

function split_vertical(g)
  g.height = g.height / 2
  return {
    x = g.x,
    y = g.y + g.height,
    width = g.width,
    height = g.height,
  }
end

function split_2to3(g1, g2)
  g1.height = g1.height * 2 / 3
  g2.height = g2.height * 2 / 3
  g2.y = g1.y + g1.height
  return {
    x = g1.x,
    y = g2.y + g2.height,
    width = g1.width,
    height = g1.height,
  }
end

function horiz3.arrange(p)
  local wa = p.workarea
  local cls = p.clients

  if #cls > 0 then
      p.geometries[cls[1]] = {
        x = wa.x,
        y = wa.y,
        width = wa.width,
        height = wa.height
      }

      if #cls >= 2 then
        p.geometries[cls[1]].width = wa.width / 3
        p.geometries[cls[2]] = {
          x = wa.x + wa.width / 3,
          y = wa.y,
          width = wa.width * 2 / 3,
          height = wa.height
        }
      end

      if #cls >= 3 then
        p.geometries[cls[3]] = split_horizontal(p.geometries[cls[2]])
      end

      if #cls >= 4 then
        for i = 4,math.min(#cls,6) do
          p.geometries[cls[i]] = split_vertical(p.geometries[cls[i - 3]])
        end
      end

      if #cls >= 7 then
        for i = 7,math.min(#cls,12) do
          p.geometries[cls[i]] = split_horizontal(p.geometries[cls[i - 6]])
        end
      end

      if #cls >= 13 then
        if #cls <= 18 then
          local map = { 1, 7, 2, 8, 3, 9 }
          for i = 13,#cls do
            p.geometries[cls[i]] = split_2to3(p.geometries[cls[map[i - 12]]], p.geometries[cls[map[i - 12]+3]])
          end
        else
          local base = 12
          for i = 13,#cls do
            if i > base * 2 then
              base = base * 2
            end
            p.geometries[cls[i]] = split_vertical(p.geometries[cls[i - base]])
          end
        end
      end

  end
end

return horiz3