From 97eadef0c38c0b45d3cfa2287bc270000daed667 Mon Sep 17 00:00:00 2001
From: Bernardo Meurer <bernardo@meurer.org>
Date: Mon, 28 Sep 2020 12:13:09 -0700
Subject: [PATCH] nixos/klipper: init

---
 nixos/modules/module-list.nix           |  1 +
 nixos/modules/services/misc/klipper.nix | 59 +++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 nixos/modules/services/misc/klipper.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 39f28773eab..82cc956ed24 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -466,6 +466,7 @@
   ./services/misc/irkerd.nix
   ./services/misc/jackett.nix
   ./services/misc/jellyfin.nix
+  ./services/misc/klipper.nix
   ./services/misc/logkeys.nix
   ./services/misc/leaps.nix
   ./services/misc/lidarr.nix
diff --git a/nixos/modules/services/misc/klipper.nix b/nixos/modules/services/misc/klipper.nix
new file mode 100644
index 00000000000..2f04c011a65
--- /dev/null
+++ b/nixos/modules/services/misc/klipper.nix
@@ -0,0 +1,59 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.klipper;
+  package = pkgs.klipper;
+  format = pkgs.formats.ini { mkKeyValue = generators.mkKeyValueDefault {} ":"; };
+in
+{
+  ##### interface
+  options = {
+    services.klipper = {
+      enable = mkEnableOption "Klipper, the 3D printer firmware";
+
+      octoprintIntegration = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Allows Octoprint to control Klipper.";
+      };
+
+      settings = mkOption {
+        type = format.type;
+        default = { };
+        description = ''
+          Configuration for Klipper. See the <link xlink:href="https://www.klipper3d.org/Overview.html#configuration-and-tuning-guides">documentation</link>
+          for supported values.
+        '';
+      };
+    };
+  };
+
+  ##### implementation
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = cfg.octoprintIntegration -> config.services.octoprint.enable;
+      message = "Option klipper.octoprintIntegration requires Octoprint to be enabled on this system. Please enable services.octoprint to use it.";
+    }];
+
+    environment.etc."klipper.cfg".source = format.generate "klipper.cfg" cfg.settings;
+
+    systemd.services.klipper = {
+      description = "Klipper 3D Printer Firmware";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+
+      serviceConfig = {
+        ExecStart = "${package}/lib/klipper/klippy.py --input-tty=/run/klipper/tty /etc/klipper.cfg";
+        RuntimeDirectory = "klipper";
+        SupplementaryGroups = [ "dialout" ];
+        WorkingDirectory = "${package}/lib";
+      } // (if cfg.octoprintIntegration then {
+        Group = config.services.octoprint.group;
+        User = config.services.octoprint.user;
+      } else {
+        DynamicUser = true;
+        User = "klipper";
+      });
+    };
+  };
+}