Rounded Corners somewm-only

SomeWM 2.1 draws rounded corners on Wayland clients through client.shape.

Set a rule

Add this to your rc.lua:

local ruled = require("ruled")
local gears = require("gears")
local dpi = require("beautiful.xresources").apply_dpi

ruled.client.connect_signal("request::rules", function()
    ruled.client.append_rule {
        id = "rounded", rule = { },
        properties = {
            border_width = 0,
            shape = function(cr, w, h) gears.shape.rounded_rect(cr, w, h, dpi(14)) end,
        }
    }
end)

• rule = { } matches every client. Put this before more specific rules so they can override it.
• To select particular windows, change the match as described in Client Rules.
• For a radius of 14 pixels without DPI adjustment, replace the shape line with shape = 14,.
• For the default radius of 10 pixels, use shape = gears.shape.rounded_rect,.

Remove the square border

• Set border_width = 0 on rounded clients.
• SomeWM subtracts the border width from the corner radius, down to zero.
• The border is a plain rectangle around the rounded window. A 2px theme border makes the outer corners look square.
• A border width set by a rule or by hand is kept when focus changes.
• Without a border, a click in a cut corner reaches what is below the window.

Keep titlebars

• A titlebar on an edge takes that edge's corners. The window takes the remaining corners.
• With a top titlebar, the titlebar has rounded top corners and the window has rounded bottom corners.
• Fullscreen clients stay square, even when shape is set.

Try open windows

Run this from a shell to round every open client without reloading:

somewm-client eval 'for _, c in ipairs(client.get()) do c.shape = 14; c.border_width = 0 end'

Set shape back to nil to make them square again:

somewm-client eval 'for _, c in ipairs(client.get()) do c.shape = nil end'

This leaves their border width at zero. See somewm-client for the eval constraints.

If corners stay square

• Use a number, gears.shape.rounded_rect, or a function that draws the same rounded rectangle path.
• A squircle or another custom path stays square. SomeWM warns once per client and function, naming the client's class or name.
• gears.shape.rectangle stays square without a warning.
• shape_bounding, shape_clip and shape_input accept assignments but are never read. They return nil.
• client.shape is the only property that sets client corners. gears.surface.apply_shape_bounding with a rounded rectangle sets it too.