nix/module/Keyd.nix

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{ pkgs, config, lib, ... }: with lib; let
cfg = config.module.keyd;
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in {
options = {
module.keyd = {
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enable = mkEnableOption "Keyboard remaps." // { default = true; };
};
};
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config = mkIf cfg.enable {
environment.systemPackages = with pkgs; [ keyd ];
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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 = "${config.setting.sysctrl}"; # System controls.
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leftcontrol = "overload(layer_alternative, leftcontrol)"; # Alternative layer for home, end etc.
rightcontrol = "layer(layer_control)"; # Media and other controls.
rightshift = "backspace"; # Backspace.
};
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# 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";
};
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# 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";
};
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};
};
};
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# HACK: Workaround for https://github.com/NixOS/nixpkgs/issues/290161
users.groups.keyd = {};
systemd.services.keyd.serviceConfig.CapabilityBoundingSet = [ "CAP_SETGID" ];
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# Debug toggle just in case I need it again.
# systemd.services.keyd.environment.KEYD_DEBUG = "1";
};
}