feat(printer): added support for a new printer

hosts/pc/configuration.nix

@@ -65,6 +65,7 @@ with lib.my;
       boinc.enable = true;
       backup.enable = true;
       rss.enable = true;
+      printer.enable = true;
       syncthing.enable = true;
       redshift.enable = true;
       filebot.enable = true;

modules/services/printer.nix

@@ -0,0 +1,113 @@
+{ config, pkgs, lib, ... }:
+with lib;
+with lib.my;
+let
+  cfg = config.modules.services.printer;
+
+  configDir = "/etc/scanbd";
+  saneConfigDir = "${configDir}/sane.d";
+
+  scanbdConf = pkgs.writeText "scanbd.conf"
+    ''
+      global {
+        debug = true
+        debug-level = 3
+        user = wittano
+        group = scanner
+        scriptdir = ${configDir}/scripts
+        pidfile = /var/run/scanbd.pid
+        timeout = 500
+        environment {
+          device = "SCANBD_DEVICE"
+          action = "SCANBD_ACTION"
+        }
+
+        multiple_actions = true
+        action scan {
+          filter = "^scan.*"
+          numerical-trigger {
+            from-value = 1
+            to-value = 0
+          }
+          desc = "Scan to file"
+          script = "scan.script"
+        }
+      }
+    '';
+
+  scanScript = pkgs.writeShellApplication
+    {
+      name = "scanbd_scan";
+      runtimeInputs = with pkgs; [ coreutils sane-frontends sane-backends ghostscript imagemagick ];
+      text = ''
+        date="$(date --iso-8601=seconds)"
+        filename="Scan $date.pdf"
+        tmpdir="$(mktemp -d)"
+        pushd "$tmpdir"
+        scanadf -d "$SCANBD_DEVICE" --source "ADF Duplex" --mode Gray --resolution 200dpi
+
+        # Convert any PNM images produced by the scan into a PDF with the date as a name
+        convert image* -density 200 "$filename"
+        chmod 0666 "$filename"
+
+        # Remove temporary PNM images
+        rm --verbose image*
+
+        # Atomic move converted PDF to destination directory
+        paperlessdir="/var/lib/paperless/consume"
+        cp -pv "$filename" $paperlessdir/"$filename".tmp &&
+        mv $paperlessdir/"$filename".tmp $paperlessdir/"$filename" &&
+        rm "$filename"
+
+        popd
+        rm -r "$tmpdir"
+      '';
+    };
+in
+{
+  options = {
+    modules.services.printer = {
+      enable = mkEnableOption "Enable CUPS services and install printer driver";
+    };
+  };
+
+  imports = [
+    <nixpkgs/nixos/modules/services/hardware/sane_extra_backends/brscan4.nix>
+  ];
+
+  config = mkIf cfg.enable {
+    # Scanner
+    hardware.sane = {
+      enable = true;
+      brscan4.enable = true;
+    };
+    users.users.wittano.extraGroups = [ "scanner" "lp" ];
+    environment.systemPackages = with pkgs; [ gnome.simple-scan ];
+
+    # Printer
+    programs.system-config-printer.enable = true;
+    hardware.printers = rec{
+      ensureDefaultPrinter = "Brother";
+      ensurePrinters = [
+        {
+          name = ensureDefaultPrinter;
+          location = "Home";
+          model = "drv:///brlaser.drv/br1600.ppd";
+          deviceUri = "usb://Brother/DCP-1610W%20series?serial=E79207E4L151198";
+          description = "Brother DCP-1623WE";
+        }
+      ];
+    };
+    services = {
+      printing = {
+        enable = true;
+        drivers = with pkgs; [ brlaser brgenml1lpr brgenml1cupswrapper ];
+      };
+      avahi = {
+        enable = true;
+        nssmdns4 = true;
+        openFirewall = true;
+      };
+    };
+  };
+}