115 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			115 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
{ config, lib, pkgs, ... }:
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with lib;
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let
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  cfg = config.services.triggerhappy;
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  socket = "/run/thd.socket";
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  configFile = pkgs.writeText "triggerhappy.conf" ''
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    ${concatMapStringsSep "\n"
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      ({ keys, event, cmd, ... }:
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        ''${concatMapStringsSep "+" (x: "KEY_" + x) keys} ${toString { press = 1; hold = 2; release = 0; }.${event}} ${cmd}''
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      )
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      cfg.bindings}
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    ${cfg.extraConfig}
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  '';
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  bindingCfg = { config, ... }: {
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    options = {
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      keys = mkOption {
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        type = types.listOf types.str;
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        description = "List of keys to match.  Key names as defined in linux/input-event-codes.h";
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      };
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      event = mkOption {
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        type = types.enum ["press" "hold" "release"];
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        default = "press";
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        description = "Event to match.";
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      };
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      cmd = mkOption {
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        type = types.str;
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        description = "What to run.";
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      };
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    };
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  };
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in
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{
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  ###### interface
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  options = {
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    services.triggerhappy = {
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      enable = mkOption {
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        type = types.bool;
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        default = false;
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        description = ''
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          Whether to enable the <command>triggerhappy</command> hotkey daemon.
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        '';
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      };
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      bindings = mkOption {
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        type = types.listOf (types.submodule bindingCfg);
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        default = [];
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        example = lib.literalExample ''
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          [ { keys = ["PLAYPAUSE"];  cmd = "''${pkgs.mpc_cli}/bin/mpc -q toggle"; } ]
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        '';
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        description = ''
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          Key bindings for <command>triggerhappy</command>.
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        '';
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      };
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      extraConfig = mkOption {
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        type = types.lines;
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        default = "";
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        description = ''
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          Literal contents to append to the end of <command>triggerhappy</command> configuration file.
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        '';
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      };
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    };
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  };
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  ###### implementation
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  config = mkIf cfg.enable {
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    systemd.sockets.triggerhappy = {
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      description = "Triggerhappy Socket";
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      wantedBy = [ "sockets.target" ];
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      socketConfig.ListenDatagram = socket;
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    };
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    systemd.services.triggerhappy = {
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      wantedBy = [ "multi-user.target" ];
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      after = [ "local-fs.target" ];
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      description = "Global hotkey daemon";
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      serviceConfig = {
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        ExecStart = "${pkgs.triggerhappy}/bin/thd --user nobody --socket ${socket} --triggers ${configFile} --deviceglob /dev/input/event*";
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      };
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    };
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    services.udev.packages = lib.singleton (pkgs.writeTextFile {
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      name = "triggerhappy-udev-rules";
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      destination = "/etc/udev/rules.d/61-triggerhappy.rules";
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      text = ''
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        ACTION=="add", SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{name}!="triggerhappy", \
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          RUN+="${pkgs.triggerhappy}/bin/th-cmd --socket ${socket} --passfd --udev"
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      '';
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    });
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  };
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}
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