Services.evdevremapkeys.settings and YAML in configuration.nix

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I converted the example evdevremapkeys config file from YAML → JSON → Nix and this is the result:

Config (Nix) 
  settings = {
    devices = [
      {
        input_name = "Kingsis Peripherals Evoluent VerticalMouse 4";
        output_name = "remap-mouse";
        remappings = {
          BTN_EXTRA = [
            "KEY_LEFTMETA"
            "KEY_Z"
          ];
          BTN_FORWARD = [
            "KEY_LEFTMETA"
            "KEY_W"
          ];
          BTN_MIDDLE = [ "BTN_RIGHT" ];
          BTN_RIGHT = [
            "KEY_LEFTMETA"
            "KEY_A"
          ];
          BTN_SIDE = [ "BTN_MIDDLE" ];
        };
      }
      {
        input_name = "KINESIS FREESTYLE KB800 KB800 Kine
sis Freestyle";
        input_phys = "usb-0000:00:14.0-3.3/input0";
        output_name = "remap-kbd";
        remappings = {
          KEY_CAPSLOCK = [ "KEY_LEFTCTRL" ];
          KEY_LEFTCTRL = [ "KEY_CAPSLOCK" ];
        };
      }
    ];
  };

Here is also the advanced config in Nix, as a plus:

Advanced config (Nix) 
  settings = {
    devices = [
      {
        input_fn = "/dev/input/event7";
        input_name = "Compx 2.4G Receiver";
        output_name = "remap-mouse";
        remappings = {
          BTN_EXTRA = [
            {
              code = "REL_WHEEL";
              rate = 0.3;
              repeat = true;
              type = "EV_REL";
              value = 1;
            }
          ];
          BTN_RIGHT = [
            {
              code = "BTN_LEFT";
              count = 2;
              repeat = true;
              value = [
                1
                0
              ];
            }
          ];
          BTN_SIDE = [
            {
              code = "REL_WHEEL";
              repeat = true;
              type = "EV_REL";
              value = -1;
            }
          ];
          REL_WHEEL = [
            {
              code = "BTN_RIGHT";
              count = 4;
              delay = true;
            }
          ];
        };
      }
      {
        input_fn = "/dev/input/event4";
        input_name = "AT Translated Set 2 keyboard";
        output_name = "remap-kbd";
        remappings = {
          KEY_LEFTALT = [
            {
              code = "KEY_A";
              repeat = true;
              value = [
                1
                0
                1
                0
              ];
            }
          ];
          KEY_LEFTSHIFT = [
            {
              code = "KEY_A";
              count = 6;
              repeat = true;
              value = [
                1
                0
              ];
            }
          ];
          KEY_RIGHTSHIFT = [
            {
              code = "KEY_A";
              count = 3;
              repeat = true;
              value = [
                1
                0
                1
                0
              ];
            }
          ];
        };
      }
    ];
  };

From this, we can see that keys should be written in lists for it to work correctly:

	remappings = {
-	  KEY_LEFTALT = "KEY_A";
+	  KEY_LEFTALT = [ "KEY_A" ];
	};

Alternatively, you can convert the config from YAML to JSON and import the file with:

  services = {
    evdevremapkeys = {
      enable = true;
      settings = lib.importJSON ./path/to/config.json;
    };
  };

We have to convert to JSON because currently there isn’t any function that imports YAML, unless you do something like this:

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