my_powerline_hack.patch

diff --git a/awesomerc.lua b/awesomerc.lua
index 87d9da7..b578996 100755
--- a/awesomerc.lua
+++ b/awesomerc.lua
@@ -231,6 +231,105 @@ awful.screen.connect_for_each_screen(function(s)
             s.mylayoutbox,
         },
     }
+
+local function powerline_fit(self, context, width, height)
+    local old_spacing = self._private.spacing
+    local spacing = self._private.dir == "x" and height/2 or width/2
+    self._private.spacing = self._private.dir == "x" and height/2 or width/2
+    local w, h = self:original_fit(context, width, height)
+    self._private.spacing = old_spacing
+    if self._private.dir == "x" then
+        return w + spacing, h
+    else
+        return w, h + spacing
+    end
+end
+
+local function powerline_layout(self, context, width, height)
+    local old_spacing = self._private.spacing
+    local spacing = self._private.dir == "x" and height/2 or width/2
+    self._private.spacing = self._private.dir == "x" and height/2 or width/2
+    local result = self:original_layout(context, width, height)
+    self._private.spacing = old_spacing
+    return result
+end
+
+local function powerline_before_draw_children(self, context, cr, width, height)
+    -- Normally it is a baaad idea to call a :layout() function directly.
+    -- However, since I'm calling "my own" :layout(), it's ok.
+    local layout = self:layout(context, width, height) or {}
+    local colors = self.colors or {
+        "#0000ff80",
+        "#ff0000e0",
+        "#00ff0060"
+    }
+    local cairo = require("lgi").cairo
+    local spacing = self._private.dir == "x" and height/2 or width/2
+
+    -- TODO: Support all directions
+    assert(self.direction == "right", "A psychon-is-lazy-assert failed")
+    cr:save()
+    cr:push_group_with_content(cairo.Content.COLOR_ALPHA)
+    cr.operator = cairo.Operator.SOURCE
+    -- Go through all widgets (ignoring the spacers added in powerline_add())
+    for i = #layout, 1, -1 do
+        -- This accesses quite some implementation details for which we have no
+        -- proper API. Baaaaaaad.
+        -- Get the positions of the two spacers. However, there is no spacer
+        -- before the first widget!
+        local begin_x = layout[i]._matrix.x0 - spacing
+        local end_x = layout[i]._matrix.x0 + layout[i]._width + spacing
+        local color = gears.color(colors[i%#colors+1])
+        assert(color)
+
+        cr:move_to(begin_x, height)
+        cr:line_to(begin_x, 0)
+
+        cr:line_to(end_x-spacing, 0)
+        cr:rel_line_to(spacing, height/2)
+        cr:rel_line_to(-spacing, height/2)
+        cr:close_path()
+        cr:set_source(color)
+        cr:fill()
+    end
+    cr:pop_group_to_source()
+    cr.operator = cairo.Operator.OVER
+    cr:paint()
+    cr:restore()
+end
+
+local function powerline()
+    local l = wibox.layout.fixed.horizontal()
+    rawset(l, "original_fit", l.fit)
+    rawset(l, "original_layout", l.layout)
+    rawset(l, "fit", powerline_fit)
+    rawset(l, "layout", powerline_layout)
+    rawset(l, "before_draw_children", powerline_before_draw_children)
+    l:connect_signal("widget::layout_changed", function() l:emit_signal("widget::redraw_needed") end)
+    return l
+end
+
+s.mywibox:setup{
+	{
+		{
+			widget = wibox.widget.base.make_widget(),
+			forced_width= 0.5
+		},
+		wibox.widget.textbox "one",
+		wibox.widget.textbox "two",
+		wibox.widget.textbox "three",
+		wibox.widget.textbox "four",
+		wibox.widget.textbox "five",
+		direction = "right",
+		widget = powerline
+	},
+	widget = wibox.container.background,
+	bg = gears.color.create_linear_pattern{
+		from = { 0, 0 },
+		to = { s.mywibox:geometry().width, 0 },
+		stops = { { 0, "#ffff00" }, { 0.2, "#00ff00" }, { 0.4, "#00ffff" } }
+	}
+}
 end)
 -- }}}