uschindler commented on a change in pull request #1522:
URL: https://github.com/apache/lucene-solr/pull/1522#discussion_r426401368



##########
File path: gradle/validation/documentation-lint.gradle
##########
@@ -0,0 +1,65 @@
+/*
+ * 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.
+ */
+
+configure(rootProject) {
+
+  task documentationLint {
+    group 'Verification'
+    description 'Verify all documentation'
+
+    dependsOn 'documentation'
+    dependsOn subprojects.collect { prj ->
+      prj.tasks.matching { task -> task.name == 'checkBrokenLinks'}
+    }
+  }
+
+  // TODO: uncomment this line after fixing all broken links.
+  // (we can't fix the cross-project links until ant build is disabled.)
+  // check.dependsOn documentationLint
+}
+
+configure(subprojects.findAll { it.path in [':lucene', ':solr'] }) {
+  task checkBrokenLinks(type: CheckBrokenLinksTask)
+}
+
+class CheckBrokenLinksTask extends DefaultTask {
+  @Input
+  File docsDir = project.docroot

Review comment:
       You can use a `RegularFileProperty` instead of a File and then use 
`providers.property{...}` to assign value. Gradle DSL does not change, just 
when using it from Groovy code or Java code, you have to call 
`get().getAsFile()` (which does lazy evaluation).
   I did not use that for render-javadocs, becuase it was not needed.
   
   Another "simple" way for lazy evaluation (works only with Strings, but its 
often helpful) is to use GString (double quoted Strings): `GString someProperty 
= "${->project.docroot}"` (please note the `->`). Whenever `toString()` or `as 
String` is called, its lazinly evaluated. Without the `->` the value is 
inserted into the string at parsing time.
   
   I had the same problem with #1477, but I will plan to do this for the URL 
coming from an extension:
   
   ```groovy
     @Input
     def luceneDocUrl = "${->project.luceneDocUrl}"
   
     @Input
     def solrDocUrl = "${->project.solrDocUrl}"  
   ```




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