wip: flake support

modules/home-manager.nix

@@ -0,0 +1,67 @@
+{ self, ... }@inputs:
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.programs.doom-emacs;
+  inherit (lib) literalExample mkEnableOption mkIf mkOption types;
+in
+{
+  options.programs.doom-emacs = {
+    enable = mkEnableOption "Doom Emacs configuration";
+    doomPrivateDir = mkOption {
+      description = ''
+        Path to your `.doom.d` directory.
+
+        The specified directory should  contain yoour `init.el`, `config.el` and
+        `packages.el` files.
+      '';
+    };
+    extraConfig = mkOption {
+      description = ''
+        Extra configuration options to pass to doom-emacs.
+
+        Elisp code set here will be appended at the end of `config.el`. This
+        option is useful for refering `nixpkgs` derivation in Emacs without the
+        need to install them globally.
+      '';
+      type = with types; lines;
+      default = "";
+      example = literalExample ''
+        (setq mu4e-mu-binary = "''${pkgs.mu}/bin/mu")
+      '';
+    };
+    extraPackages = mkOption {
+      description = ''
+        Extra packages to install.
+
+        List addition non-emacs packages here that ship elisp emacs bindings.
+      '';
+      type = with types; listOf package;
+      default = [ ];
+      example = literalExample "[ pkgs.mu ]";
+    };
+    package = mkOption {
+      internal = true;
+    };
+  };
+
+  config = mkIf cfg.enable (
+    let
+      emacs = pkgs.callPackage self {
+        extraPackages = (epkgs: cfg.extraPackages);
+        inherit (cfg) doomPrivateDir extraConfig;
+        dependencyOverrides = inputs;
+      };
+    in
+    {
+      home.file.".emacs.d/init.el".text = ''
+        (load "default.el")
+      '';
+      home.packages = with pkgs; [
+        emacs-all-the-icons-fonts
+      ];
+      programs.emacs.package = emacs;
+      programs.emacs.enable = true;
+      programs.doom-emacs.package = emacs;
+    }
+  );
+}