Fix Scaladocs build. (#523)

- Resolves #522
  - See: scala/bug#9111 (comment)
- Update README doc links

README.md

@@ -1,8 +1,8 @@
 # The Archives Unleashed Toolkit
 [![codecov](https://codecov.io/gh/archivesunleashed/aut/branch/main/graph/badge.svg)](https://codecov.io/gh/archivesunleashed/aut)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.archivesunleashed/aut/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.archivesunleashed/aut)
-[![Javadoc](https://javadoc-badge.appspot.com/io.archivesunleashed/aut.svg?label=javadoc)](http://api.docs.archivesunleashed.io/0.90.3/apidocs/index.html)
-[![Scaladoc](https://javadoc-badge.appspot.com/io.archivesunleashed/aut.svg?label=scaladoc)](http://api.docs.archivesunleashed.io/0.90.3/scaladocs/index.html)
+[![Javadoc](https://javadoc-badge.appspot.com/io.archivesunleashed/aut.svg?label=javadoc)](https://api.docs.archivesunleashed.io/0.90.3/apidocs/index.html)
+[![Scaladoc](https://javadoc-badge.appspot.com/io.archivesunleashed/aut.svg?label=scaladoc)](https://api.docs.archivesunleashed.io/0.90.3/scaladocs/io/archivesunleashed/index.html)
 [![UserDocs](https://img.shields.io/badge/UserDocs-0.90.3-brightgreen?style=flat)](https://aut.docs.archivesunleashed.org/docs/home)
 [![LICENSE](https://img.shields.io/badge/license-Apache-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Contribution Guidelines](http://img.shields.io/badge/CONTRIBUTING-Guidelines-blue.svg)](./CONTRIBUTING.md)

pom.xml

@@ -44,6 +44,7 @@
     <versions.plugin.version>2.1</versions.plugin.version>
     <tika.version>1.22</tika.version>
     <jackson.version>2.10.0</jackson.version>
+    <scala.maven.plugin.version>4.5.4</scala.maven.plugin.version>
   </properties>
 
   <licenses>
@@ -147,7 +148,7 @@
       <plugin>
         <groupId>net.alchim31.maven</groupId>
         <artifactId>scala-maven-plugin</artifactId>
-        <version>4.2.0</version>
+        <version>${scala.maven.plugin.version}</version>
         <executions>
           <execution>
             <phase>process-resources</phase>
@@ -163,18 +164,31 @@
               <goal>testCompile</goal>
             </goals>
           </execution>
+          <execution>
+            <id>attach-scaladocs</id>
+            <phase>verify</phase>
+            <goals>
+              <goal>doc-jar</goal>
+            </goals>
+            <configuration>
+              <args>
+                <arg>-no-java-comments</arg>
+                <arg>-no-link-warnings</arg>
+              </args>
+            </configuration>
+          </execution>
         </executions>
         <configuration>
           <scalaVersion>${scala.version}</scalaVersion>
           <checkMultipleScalaVersions>true</checkMultipleScalaVersions>
           <failOnMultipleScalaVersions>true</failOnMultipleScalaVersions>
           <sendJavaToScalac>true</sendJavaToScalac>
           <args>
-            <arg>-target:jvm-1.8</arg>
-            <arg>-g:vars</arg>
+            <arg>-unchecked</arg>
             <arg>-deprecation</arg>
-            <arg>-dependencyfile</arg>
-            <arg>${project.build.directory}/.scala_dependencies</arg>
+            <arg>-feature</arg>
+            <arg>-explaintypes</arg>
+            <arg>-target:jvm-1.8</arg>
           </args>
         </configuration>
       </plugin>
@@ -412,6 +426,17 @@
           </reportSet>
         </reportSets>
       </plugin>
+      <plugin>
+        <groupId>net.alchim31.maven</groupId>
+        <artifactId>scala-maven-plugin</artifactId>
+        <version>${scala.maven.plugin.version}</version>
+        <configuration>
+          <args>
+            <arg>-no-java-comments</arg>
+            <arg>-no-link-warnings</arg>
+          </args>
+        </configuration>
+      </plugin>
     </plugins>
   </reporting>
 

src/main/scala/io/archivesunleashed/package.scala

@@ -65,6 +65,7 @@ import org.apache.spark.sql.types.{
 }
 import org.apache.spark.sql.{DataFrame, Dataset, Row, SparkSession}
 import org.apache.spark.{RangePartitioner, SerializableWritable, SparkContext}
+import scala.language.postfixOps
 import scala.reflect.ClassTag
 import scala.util.matching.Regex
 import scala.util.Try