emacs: add darwin service

modules/services/emacs.nix

@@ -41,7 +41,6 @@ let
   # to work without wrapping it.
   socketDir = "%t/emacs";
   socketPath = "${socketDir}/server";
-
 in {
   meta.maintainers = [ maintainers.tadfisher ];
 
@@ -112,12 +111,7 @@ in {
   };
 
   config = mkIf cfg.enable (mkMerge [
-    {
+    (mkIf pkgs.stdenv.isLinux {
-      assertions = [
-        (lib.hm.assertions.assertPlatform "services.emacs" pkgs
-          lib.platforms.linux)
-      ];
-
       systemd.user.services.emacs = {
         Unit = {
           Description = "Emacs text editor";
@@ -190,9 +184,9 @@ in {
             }/bin/emacsclient "''${@:---create-frame}"'');
         };
       };
-    }
+    })
 
-    (mkIf cfg.socketActivation.enable {
+    (mkIf (cfg.socketActivation.enable && pkgs.stdenv.isLinux) {
       systemd.user.sockets.emacs = {
         Unit = {
           Description = "Emacs text editor";
@@ -222,5 +216,20 @@ in {
         };
       };
     })
+
+    (mkIf pkgs.stdenv.isDarwin {
+      launchd.agents.emacs = {
+        enable = true;
+        config = {
+          ProgramArguments = [ "${cfg.package}/bin/emacs" "--fg-daemon" ]
+            ++ cfg.extraOptions;
+          RunAtLoad = true;
+          KeepAlive = {
+            Crashed = true;
+            SuccessfulExit = false;
+          };
+        };
+      };
+    })
   ]);
 }

tests/default.nix

@@ -173,6 +173,7 @@ in import nmtSrc {
     ./modules/xresources
   ] ++ lib.optionals isDarwin [
     ./modules/launchd
+    ./modules/services/emacs-darwin
     ./modules/services/espanso-darwin
     ./modules/services/git-sync-darwin
     ./modules/services/imapnotify-darwin

tests/modules/services/emacs-darwin/basic.nix

@@ -0,0 +1,23 @@
+{ lib, pkgs, ... }:
+
+{
+  nixpkgs.overlays = [
+    (self: super: rec {
+      emacs = pkgs.writeShellScriptBin "dummy-emacs-28.0.5" "" // {
+        outPath = "@emacs@";
+      };
+      emacsPackagesFor = _:
+        lib.makeScope super.newScope (_: { emacsWithPackages = _: emacs; });
+    })
+  ];
+
+  services.emacs = { enable = true; };
+
+  nmt.script = ''
+    serviceFile=LaunchAgents/org.nix-community.home.emacs.plist
+
+    assertFileExists "$serviceFile"
+
+    assertFileContent "$serviceFile" ${./expected-agent.plist}
+  '';
+}

tests/modules/services/emacs-darwin/default.nix

@@ -0,0 +1 @@
+{ emacs-service-basic = ./basic.nix; }

tests/modules/services/emacs-darwin/expected-agent.plist

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>KeepAlive</key>
+	<dict>
+		<key>Crashed</key>
+		<true/>
+		<key>SuccessfulExit</key>
+		<false/>
+	</dict>
+	<key>Label</key>
+	<string>org.nix-community.home.emacs</string>
+	<key>ProgramArguments</key>
+	<array>
+		<string>@emacs@/bin/emacs</string>
+		<string>--fg-daemon</string>
+	</array>
+	<key>RunAtLoad</key>
+	<true/>
+</dict>
+</plist>