ne: add module

Added a simple module to place configuration files for ne: the nice
editor.

PR #1336

modules/programs/ne.nix

@@ -0,0 +1,95 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.ne;
+
+  autoPrefFiles = let
+    autoprefs = cfg.automaticPreferences
+      // optionalAttrs (cfg.defaultPreferences != "") {
+        ".default" = cfg.defaultPreferences;
+      };
+
+    gen = fileExtension: configText:
+      nameValuePair ".ne/${fileExtension}#ap" {
+        text = configText;
+      }; # Generates [path].text format expected by home.file.
+  in mapAttrs' gen autoprefs;
+
+in {
+  meta.maintainers = [ hm.maintainers.cwyc ];
+
+  options.programs.ne = {
+    enable = mkEnableOption "ne";
+
+    keybindings = mkOption {
+      type = types.lines;
+      default = "";
+      example = ''
+        KEY 7f BS
+        SEQ "\x1b[1;5D" 7f
+      '';
+      description = ''
+        Keybinding file for ne.
+      '';
+    };
+
+    defaultPreferences = mkOption {
+      type = types.lines;
+      default = "";
+      description = ''
+        Default preferences for ne.
+        </para><para>
+        Equivalent to <literal>programs.ne.automaticPreferences.".default"</literal>.
+      '';
+    };
+
+    automaticPreferences = mkOption {
+      type = types.attrsOf types.lines;
+      default = { };
+      example = literalExample ''
+        {
+          nix = '''
+            TAB 0
+            TS 2
+          ''';
+          js = '''
+            TS 4
+          ''';
+        }
+      '';
+      description = ''
+        Automatic preferences files for ne.
+      '';
+    };
+
+    menus = mkOption {
+      type = types.lines;
+      default = "";
+      description = "Menu configuration file for ne.";
+    };
+
+    virtualExtensions = mkOption {
+      type = types.lines;
+      default = "";
+      example = ''
+        sh   1  ^#!\s*/.*\b(bash|sh|ksh|zsh)\s*
+        csh  1  ^#!\s*/.*\b(csh|tcsh)\s*
+      '';
+      description = "Virtual extensions configuration file for ne.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ pkgs.ne ];
+
+    home.file = {
+      ".ne/.keys" = mkIf (cfg.keybindings != "") { text = cfg.keybindings; };
+      ".ne/.extensions" =
+        mkIf (cfg.virtualExtensions != "") { text = cfg.virtualExtensions; };
+      ".ne/.menus" = mkIf (cfg.menus != "") { text = cfg.menus; };
+    } // autoPrefFiles;
+  };
+}