dweiss commented on code in PR #1320:
URL: https://github.com/apache/solr/pull/1320#discussion_r1094174337


##########
buildSrc/src/main/java/org/apache/lucene/gradle/GradlePropertiesGenerator.java:
##########
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.lucene.gradle;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * Standalone class that generates a populated gradle.properties from a 
template.
+ *
+ * <p>Has no dependencies outside of standard java libraries
+ */
+public class GradlePropertiesGenerator {
+  public static void main(String[] args) {
+    if (args.length != 2) {
+      System.err.println("Usage: java GradlePropertiesGenerator.java <source> 
<destination>");
+      System.exit(2);
+    }
+
+    try {
+      new GradlePropertiesGenerator().run(Paths.get(args[0]), 
Paths.get(args[1]));
+    } catch (Exception e) {
+      System.err.println("ERROR: " + e.getMessage());
+      System.exit(3);
+    }
+  }
+
+  public void run(Path source, Path destination) throws IOException {
+    if (!Files.exists(source)) {
+      throw new IOException("template file not found: " + source);
+    }
+    if (Files.exists(destination)) {
+      System.out.println(destination + " already exists, skipping 
generation.");
+    }
+
+    // Approximate a common-sense default for running gradle/tests with 
parallel
+    // workers: half the count of available cpus but not more than 12.
+    var cpus = Runtime.getRuntime().availableProcessors();
+    var maxWorkers = (int) Math.max(1d, Math.min(cpus * 0.5d, 12));
+    var testsJvms = (int) Math.max(1d, Math.min(cpus * 0.5d, 12));
+
+    var replacements = Map.of("org.gradle.workers.max", maxWorkers, 
"tests.jvms", testsJvms);
+
+    // Java properties doesn't preserve comments, so going line by line instead
+    // The properties file isn't big, nor is the map of replacements, so not 
worrying about speed

Review Comment:
   This will work for simple values (and property names) but not when property 
values are more complex characters - these should (in theory at least) be 
escaped and/or encoded to plain ascii. I don't think it's a problem for now.



##########
help/localSettings.txt:
##########
@@ -1,62 +0,0 @@
-Local developer settings
-========================
-
-The first invocation of any task in Solr gradle build will generate

Review Comment:
   I think there is some value in leaving (some content) of this file under 
help/ - so that folks know that this file can be tweaked and is generated? 



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