Added flake.nix and nethack.nix

flake.nix

@@ -0,0 +1,10 @@
+{
+  description = "Nethack configuration module for home-manager";
+
+  inputs = {};
+
+  outputs = inputs: {
+    homeManagerModules.nethack = ./nethack.nix;
+  };
+}
+# vim: et ts=2 sw=2

nethack.nix

@@ -0,0 +1,103 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+with lib;
+let
+  generateOption = name: value:
+    if isBool value
+    then "OPTIONS=${if value then "" else "!"}${name}"
+    else "OPTIONS=${name}:${toString value}";
+
+  generateHilite = field: settings:
+    let createHiliteString = trigger: color: "/${trigger}/${color}";
+        hilite_strings = mapAttrsToList combine settings;
+    in "OPTIONS=hilite_status:${field}${concatStrings hilite_strings}";
+
+  generateMsgType = action: messages:
+    let createMsgTypeString = message: ''MSGTYPE=${action} "${message}"'';
+        msg_type_strings = map createMsgTypeString messages;
+    in concatStringsSep "\n" msg_type_strings;
+
+  generateMenuColor = regex: color: ''MENUCOLOR="${regex}"=${color}'';
+
+  generateNehackrc = nethack_config:
+    let all_configs = (mapAttrsToList generateOption nethack_config.options)
+                   ++ (mapAttrsToList generateHilite nethack_config.hilite_status)
+                   ++ (mapAttrsToList generateMsgType nethack_config.msg_types)
+                   ++ (mapAttrsToList generateMenuColor nethack_config.menu_colors);
+    in concatStringsSep "\n" all_configs;
+in
+{
+  options.programs.nethack = with types; {
+    enable = mkEnableOption "nethack configuration";
+
+    options = mkOption {
+      type = attrsOf (oneOf [bool int str]);
+      default = {};
+      description = "Nethack options";
+      example = literalExpression ''
+        {
+          boulder = "0";
+          windowtype = "curses";
+          statuslines = 3;
+          autopickup = true;
+        }
+      '';
+    }
+
+    hilite_status = mkOption {
+      type = attrsOf (attrsOf str);
+      default = {};
+      description = "Status hilites options set";
+      example = literalExpression ''
+        {
+          hitpoints = {
+            "100%" = "grey&normal";
+            "<100%" = "green&normal";
+            "<66%" = "yellow&normal";
+            "<50%" = "orange&normal";
+            "<33%" = "red&bold";
+          };
+
+          gold.up = "yellow";
+          gold.down = "brown";
+        }
+      '';
+    };
+
+    menu_colors = mkOption {
+      type = attrsOf str;
+      default = {};
+      description = "Set of MENUCOLOR= options";
+    };
+
+    msg_types = mkOption {
+      type = attrsOf (listOf str);
+      default = {};
+      description = "Set of MSGTYPE= options";
+      example = literalExpression ''
+        {
+          hide = [
+            "You swap places with .*"
+            "Your tentacles suck the .*"
+          ];
+
+          norep = [
+            "You see here a.*"
+          ];
+        }
+      '';
+    };
+  };
+
+  config = {
+    home.file.".nethackrc" = with config.programs.nethack; {
+      inherit enable;
+      text = generateNehackrc config.programs.nethack;
+    };
+  };
+}
+# vim: et ts=2 sw=2