{ pkgs, key, ... }: { environment.systemPackages = with pkgs; [ keyd ]; services.keyd = { enable = true; keyboards.default = { ids = [ "*" ]; settings = { main = { backspace = "delete"; # Delete key on backspace. capslock = "overload(control, esc)"; # Ctrl/esc combo. compose = "layer(layer_number)"; # Number input layer. esc = "${key.sysctrl}"; # System controls. leftcontrol = "overload(layer_alternative, leftcontrol)"; # Alternative layer for home, end etc. rightcontrol = "layer(layer_control)"; # Media and other controls. rightshift = "backspace"; # Backspace. }; # Alternative navigation. layer_alternative = { w = "pageup"; a = "home"; s = "pagedown"; d = "end"; x = "cut"; c = "copy"; v = "paste"; h = "left"; j = "down"; k = "up"; l = "right"; esc = "esc"; rightcontrol = "leftcontrol"; capslock = "capslock"; # space = "macro2(1, 100, macro(space))"; # NOTE: Possible bhop example. Use in per-application, not here. }; # Media controls. layer_control = { space = "playpause"; a = "back"; c = "ejectcd"; d = "forward"; e = "nextsong"; q = "previoussong"; s = "volumedown"; w = "volumeup"; x = "stopcd"; z = "mute"; }; # Number inputs. layer_number = { q = "1"; w = "2"; e = "3"; a = "4"; s = "5"; d = "6"; z = "7"; x = "8"; c = "9"; space = "0"; "1" = "f13"; "2" = "f14"; "3" = "f15"; "4" = "f16"; "5" = "f17"; "6" = "f18"; "7" = "f19"; "8" = "f20"; "9" = "f21"; "0" = "f22"; "-" = "f23"; "=" = "f24"; enter = "kpenter"; }; }; }; }; # HACK: Workaround for https://github.com/NixOS/nixpkgs/issues/290161 users.groups.keyd = {}; systemd.services.keyd.serviceConfig.CapabilityBoundingSet = [ "CAP_SETGID" ]; # Debug toggle just in case I need it again. # systemd.services.keyd.environment.KEYD_DEBUG = "1"; }