awesome: Key bindings and a function for placing a current window on the specified edge (tested with awesome-3.4.8)

gistfile1.lua

-- Place a window on the specified edge of a screen
function place_window_edge(c, h_pos, v_pos)
    local g = c:geometry()
    local wa = screen[c.screen].workarea
    local max_x = wa.width - g.width
    local max_y = wa.height - g.height
    g.x = wa.x + (h_pos + 1) * max_x / 2
    g.y = wa.y + (v_pos + 1) * max_y / 2
    c:geometry(g)
end

clientkeys = awful.util.table.join(
    awful.key({ modkey,           }, "KP_End",   function (c) place_window_edge(c, -1,  1) end),
    awful.key({ modkey,           }, "KP_Down",  function (c) place_window_edge(c,  0,  1) end),
    awful.key({ modkey,           }, "KP_Next",  function (c) place_window_edge(c,  1,  1) end),
    awful.key({ modkey,           }, "KP_Left",  function (c) place_window_edge(c, -1,  0) end),
    awful.key({ modkey,           }, "KP_Begin", function (c) place_window_edge(c,  0,  0) end),
    awful.key({ modkey,           }, "KP_Right", function (c) place_window_edge(c,  1,  0) end),
    awful.key({ modkey,           }, "KP_Home",  function (c) place_window_edge(c, -1, -1) end),
    awful.key({ modkey,           }, "KP_Up",    function (c) place_window_edge(c,  0, -1) end),
    awful.key({ modkey,           }, "KP_Prior", function (c) place_window_edge(c,  1, -1) end)
)