nixos/triggerhappy: init

nixos/modules/module-list.nix

@@ -274,6 +274,7 @@
   ./services/hardware/tlp.nix
   ./services/hardware/thinkfan.nix
   ./services/hardware/trezord.nix
+  ./services/hardware/triggerhappy.nix
   ./services/hardware/u2f.nix
   ./services/hardware/udev.nix
   ./services/hardware/udisks2.nix

nixos/modules/services/hardware/triggerhappy.nix

@@ -0,0 +1,114 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.triggerhappy;
+
+  socket = "/run/thd.socket";
+
+  configFile = pkgs.writeText "triggerhappy.conf" ''
+    ${concatMapStringsSep "\n"
+      ({ keys, event, cmd, ... }:
+        ''${concatMapStringsSep "+" (x: "KEY_" + x) keys} ${toString { press = 1; hold = 2; release = 0; }.${event}} ${cmd}''
+      )
+      cfg.bindings}
+    ${cfg.extraConfig}
+  '';
+
+  bindingCfg = { config, ... }: {
+    options = {
+
+      keys = mkOption {
+        type = types.listOf types.str;
+        description = "List of keys to match.  Key names as defined in linux/input-event-codes.h";
+      };
+
+      event = mkOption {
+        type = types.enum ["press" "hold" "release"];
+        default = "press";
+        description = "Event to match.";
+      };
+
+      cmd = mkOption {
+        type = types.str;
+        description = "What to run.";
+      };
+
+    };
+  };
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.triggerhappy = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable the <command>triggerhappy</command> hotkey daemon.
+        '';
+      };
+
+      bindings = mkOption {
+        type = types.listOf (types.submodule bindingCfg);
+        default = [];
+        example = lib.literalExample ''
+          [ { keys = ["PLAYPAUSE"];  cmd = "''${pkgs.mpc_cli}/bin/mpc -q toggle"; } ]
+        '';
+        description = ''
+          Key bindings for <command>triggerhappy</command>.
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Literal contents to append to the end of <command>triggerhappy</command> configuration file.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    systemd.sockets.triggerhappy = {
+      description = "Triggerhappy Socket";
+      wantedBy = [ "sockets.target" ];
+      socketConfig.ListenDatagram = socket;
+    };
+
+    systemd.services.triggerhappy = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "local-fs.target" ];
+      description = "Global hotkey daemon";
+      serviceConfig = {
+        ExecStart = "${pkgs.triggerhappy}/bin/thd --user nobody --socket ${socket} --triggers ${configFile} --deviceglob /dev/input/event*";
+      };
+    };
+
+    services.udev.packages = lib.singleton (pkgs.writeTextFile {
+      name = "triggerhappy-udev-rules";
+      destination = "/etc/udev/rules.d/61-triggerhappy.rules";
+      text = ''
+        ACTION=="add", SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{name}!="triggerhappy", \
+          RUN+="${pkgs.triggerhappy}/bin/th-cmd --socket ${socket} --passfd --udev"
+      '';
+    });
+
+  };
+
+}