home/modules/baremacs:init

move emacs to home-manager

home/modules/baremacs.nix

@@ -0,0 +1,164 @@
+#modified version of home-manager emacs service module for personal use
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.baremacs;
+  emacsCfg = config.programs.emacs;
+  emacsBinPath = "${cfg.package}/bin";
+
+  # Match the default socket path for the Emacs version so emacsclient continues
+  # to work without wrapping it.
+  socketDir = "%t/emacs";
+  socketPath = "${socketDir}/server";
+
+in
+{
+  options.services.baremacs = {
+    enable = mkEnableOption "the Emacs daemon";
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.emacs;
+      defaultText = literalExpression ''
+        pkgs.emacs
+      '';
+      description = "The Emacs package to use.";
+    };
+
+    socketActivation = {
+      enable = mkEnableOption "systemd socket activation for the Emacs service";
+    };
+
+    defaultEditor = {
+      enable = mkOption rec {
+        type = types.bool;
+        default = false;
+        example = !default;
+        description = "Whether to change the EDITOR environment variable or not";
+      };
+      editor = mkOption rec {
+        type = types.enum [ "emacs" "emacsclient" ];
+        default = null;
+        example = "emacsclient";
+        description = "Whether to change the EDITOR environment variable or not";
+      };
+    };
+
+    copyConfigFiles = {
+      enable = mkOption rec {
+        type = types.bool;
+        default = false;
+        example = !default;
+        description = "Whether to copy the config files to ~/.emacs.d or not";
+      };
+      files = mkOption rec {
+        type = types.attrsOf types.path;
+        default = { };
+        example = { "init.el" = ./init.el; };
+        description = "What files to copy under what name";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    {
+      assertions = [
+        (lib.hm.assertions.assertPlatform "services.emacs" pkgs
+          lib.platforms.linux)
+        {
+          assertion = cfg.defaultEditor.enable -> cfg.defaultEditor.editor != null;
+          message = ''
+            services.baremacs.defaultEditor.enable requires services.baremacs.defaultEditor.editor to be set
+          '';
+        }
+      ];
+
+      systemd.user.services.emacs = {
+        Unit = {
+          Description = "Emacs text editor";
+          Documentation =
+            "info:emacs man:emacs(1) https://gnu.org/software/emacs/";
+
+          # Avoid killing the Emacs session, which may be full of
+          # unsaved buffers.
+          X-RestartIfChanged = false;
+        } // optionalAttrs (cfg.socketActivation.enable) {
+          # Emacs deletes its socket when shutting down, which systemd doesn't
+          # handle, resulting in a server without a socket.
+          # See https://github.com/nix-community/home-manager/issues/2018
+          RefuseManualStart = true;
+        };
+
+        Service = {
+          Type = "notify";
+
+          # We wrap ExecStart in a login shell so Emacs starts with the user's
+          # environment, most importantly $PATH and $NIX_PROFILES. It may be
+          # worth investigating a more targeted approach for user services to
+          # iport the user environment.
+          ExecStart = ''
+            ${pkgs.runtimeShell} -l -c "${emacsBinPath}/emacs --fg-daemon${
+            # In case the user sets 'server-directory' or 'server-name' in
+            # their Emacs config, we want to specify the socket path explicitly
+            # so launching 'emacs.service' manually doesn't break emacsclient
+            # when using socket activation.
+              optionalString cfg.socketActivation.enable
+              "=${escapeShellArg socketPath}"
+            }"'';
+
+          # Emacs will exit with status 15 after having received SIGTERM, which
+          # is the default "KillSignal" value systemd uses to stop services.
+          SuccessExitStatus = 15;
+
+          Restart = "on-failure";
+        } // optionalAttrs (cfg.socketActivation.enable) {
+          # Use read-only directory permissions to prevent emacs from
+          # deleting systemd's socket file before exiting.
+          ExecStartPost =
+            "${pkgs.coreutils}/bin/chmod --changes -w ${socketDir}";
+          ExecStopPost =
+            "${pkgs.coreutils}/bin/chmod --changes +w ${socketDir}";
+        };
+      } // optionalAttrs (!cfg.socketActivation.enable) {
+        Install = { WantedBy = [ "default.target" ]; };
+      };
+
+      home = {
+        sessionVariables = mkIf cfg.defaultEditor.enable {
+          EDITOR = let editor = cfg.defaultEditor.editor; in
+            getBin (pkgs.writeShellScript "editor" ''
+              exec ${
+                getBin cfg.package
+              }/bin/'' + editor + head (optional (editor == "emacsclient") '' "''${@:---create-frame}"''));
+        };
+
+        file = mkIf cfg.copyConfigFiles.enable
+          (mapAttrs'
+            (n: v:
+              attrsets.nameValuePair (".emacs.d/" + n) { source = v; })
+            cfg.copyConfigFiles.files);
+      };
+    }
+
+    (mkIf cfg.socketActivation.enable {
+      systemd.user.sockets.emacs = {
+        Unit = {
+          Description = "Emacs text editor";
+          Documentation =
+            "info:emacs man:emacs(1) https://gnu.org/software/emacs/";
+        };
+
+        Socket = {
+          ListenStream = socketPath;
+          FileDescriptorName = "server";
+          SocketMode = "0600";
+          DirectoryMode = "0700";
+        };
+        Install = { WantedBy = [ "sockets.target" ]; };
+      };
+    })
+  ]);
+}