afew: add module

modules/programs/afew.nix

@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.afew;
+
+in
+
+{
+  options.programs.afew = {
+    enable = mkEnableOption "the afew initial tagging script for Notmuch";
+
+    extraConfig = mkOption {
+      type = types.lines;
+      default = ''
+        [SpamFilter]
+        [KillThreadsFilter]
+        [ListMailsFilter]
+        [ArchiveSentMailsFilter]
+        [InboxFilter]
+      '';
+      example = ''
+        [SpamFilter]
+
+        [Filter.0]
+        query = from:pointyheaded@boss.com
+        tags = -new;+boss
+        message = Message from above
+
+        [InboxFilter]
+      '';
+      description = ''
+        Extra lines added to afew configuration file. Available
+        configuration options are described in the afew manual:
+        <link xlink:href="https://afew.readthedocs.io/en/latest/configuration.html" />.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ pkgs.afew ];
+
+    xdg.configFile."afew/config".text = ''
+      # Generated by Home Manager.
+      # See https://afew.readthedocs.io/
+
+      ${cfg.extraConfig}
+    '';
+  };
+}