feat: add printer driver

modules/nix.nix

@@ -3,5 +3,13 @@
     experimental-features = [ "nix-command" "flakes" ];
     auto-optimise-store = true;
   };
+
+  nixpkgs.overlays = [
+    (self: super: {
+      mfcl3750cdwlpr = (super.callPackage ../overlays/mfcl3750cdw.nix {}).driver;
+      mfcl3750cdwcupswrapper = (super.callPackage ../overlays/mfcl3750cdw.nix {}).cupswrapper;
+    })
+  ];
+
   system.stateVersion = "23.05";
 }

modules/printing.nix

@@ -1,6 +1,11 @@
-{ ... }: {
+{ pkgs, config, ... }: {
   # Enable CUPS to print documents.
-  services.printing.enable = true;
+  services.printing = {
+    enable = true;
+    drivers = [
+      pkgs.mfcl3750cdwcupswrapper
+    ];
+  };
 
   services.avahi = {
     enable = true;
@@ -8,4 +13,20 @@
     openFirewall = true;
   };
 
+  /*
+  hardware.printers = {
+    ensurePrinters = [
+      {
+        name = "Brother MFC-L3750CDW series";
+        location = "Home";
+        deviceUri = "ipp://BROTHER-ETH.local.:631/ipp/print";
+        model =
+      }
+    ]
+  }
+  */
+
+  environment.systemPackages = with pkgs; with config.bchmnn; lib.optionals (gui.enable) [
+    system-config-printer
+  ];
 }

overlays/mfcl3750cdw.nix

@@ -0,0 +1,98 @@
+{ pkgsi686Linux
+, stdenv
+, fetchurl
+, dpkg
+, makeWrapper
+, coreutils
+, ghostscript
+, gnugrep
+, gnused
+, which
+, perl
+, lib
+}:
+
+let
+  model = "mfcl3750cdw";
+  version = "1.0.2-0";
+  src = fetchurl {
+    url = "https://download.brother.com/welcome/dlf103934/${model}pdrv-${version}.i386.deb";
+    sha256 = "3a0d5f09a265208fdd1b8266ef36286ec294c7a4befa327be81141efabe8590b";
+  };
+  reldir = "opt/brother/Printers/${model}/";
+
+in rec {
+  driver = pkgsi686Linux.stdenv.mkDerivation rec {
+    inherit src version;
+    name = "${model}drv-${version}";
+
+    nativeBuildInputs = [ dpkg makeWrapper ];
+
+    unpackPhase = "dpkg-deb -x $src $out";
+
+    installPhase = ''
+      dir="$out/${reldir}"
+      substituteInPlace $dir/lpd/filter_${model} \
+        --replace /usr/bin/perl ${perl}/bin/perl \
+        --replace "BR_PRT_PATH =~" "BR_PRT_PATH = \"$dir\"; #" \
+        --replace "PRINTER =~" "PRINTER = \"${model}\"; #"
+      wrapProgram $dir/lpd/filter_${model} \
+        --prefix PATH : ${lib.makeBinPath [
+          coreutils ghostscript gnugrep gnused which
+        ]}
+    # need to use i686 glibc here, these are 32bit proprietary binaries
+    patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
+      $dir/lpd/brmfcl3750cdwfilter
+    '';
+
+    meta = {
+      description = "Brother ${lib.strings.toUpper model} driver";
+      homepage = "http://www.brother.com/";
+      sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
+      license = lib.licenses.unfree;
+      platforms = [ "x86_64-linux" "i686-linux" ];
+      maintainers = [ lib.maintainers.bchmnn ];
+    };
+  };
+
+  cupswrapper = stdenv.mkDerivation rec {
+    inherit version src;
+    name = "${model}cupswrapper-${version}";
+
+    nativeBuildInputs = [ dpkg makeWrapper ];
+
+    unpackPhase = "dpkg-deb -x $src $out";
+
+    installPhase = ''
+      basedir=${driver}/${reldir}
+      dir=$out/${reldir}
+
+      substituteInPlace $dir/cupswrapper/brother_lpdwrapper_${model} \
+        --replace /usr/bin/perl ${perl}/bin/perl \
+        --replace "basedir =~" "basedir = \"$basedir\"; #" \
+        --replace "PRINTER =~" "PRINTER = \"${model}\"; #"
+
+      wrapProgram $dir/cupswrapper/brother_lpdwrapper_${model} \
+        --prefix PATH : ${lib.makeBinPath [ coreutils gnugrep gnused ]}
+
+      mkdir -p $out/lib/cups/filter
+      mkdir -p $out/share/cups/model
+
+      ln $dir/cupswrapper/brother_lpdwrapper_${model} $out/lib/cups/filter
+      chmod 755 $out/lib/cups/filter/brother_lpdwrapper_${model}
+
+      ln $dir/cupswrapper/brother_${model}_printer_en.ppd $out/share/cups/model
+      chmod 644 $dir/cupswrapper/brother_${model}_printer_en.ppd
+    '';
+
+    meta = {
+      description = "Brother ${lib.strings.toUpper model} CUPS wrapper driver";
+      homepage = "http://www.brother.com/";
+      sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
+      license = lib.licenses.gpl2;
+      platforms = [ "x86_64-linux" "i686-linux" ];
+      maintainers = [ lib.maintainers.bchmnn ];
+    };
+  };
+}
+