Split off doomscript execution helper

build-helpers/doomscript.nix

@@ -0,0 +1,42 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+{
+  script,
+  scriptArgs,
+  doomSource,
+  debug ? false,
+  name ? "doomscript",
+  extraArgs ? { },
+
+  emacs,
+  lib,
+  runCommandLocal,
+  runtimeShell,
+}:
+runCommandLocal name
+  (
+    {
+      inherit doomSource runtimeShell script;
+      EMACS = lib.getExe emacs;
+    }
+    // (lib.optionalAttrs debug { DEBUG = "1"; })
+    // extraArgs
+  )
+  # Set DOOMLOCALDIR somewhere harmless to stop Doom from trying to create it somewhere read-only.
+  ''
+    mkdir $out
+    export DOOMLOCALDIR=$(mktemp -d)
+    $runtimeShell $doomSource/bin/doomscript $script ${scriptArgs}
+  ''