(main) Fix resource copy in multi-module project (#838) (#841)

* Check if resource path absolute or relative
* Add CHANGELOG.adoc entry

closes #838

Author: schastlivcev

Diff for: CHANGELOG.adoc

@@ -25,6 +25,7 @@ Bug Fixes::
   * Fix maven properties not being injected as attributes during site conversion (#656)
   * Remove Java 'requires open access' module warning in modern Java versions with JRuby v9.4.5.0 (#553)
   * Fix breadcrumbs not showing the document title in maven-site pages (#763)
+  * Fix resource copy in multi-module project (#838)
 
 Improvements::
 

Diff for: asciidoctor-maven-plugin/src/main/java/org/asciidoctor/maven/process/CopyResourcesProcessor.java

@@ -60,13 +60,13 @@ public class CopyResourcesProcessor implements ResourcesProcessor {
     @Override
     public void process(File sourceRootDirectory, File outputRootDirectory, AsciidoctorMojo configuration) {
         final List<Resource> finalResources = prepareResources(sourceRootDirectory, configuration);
-        copyResources(finalResources, outputRootDirectory);
+        copyResources(finalResources, outputRootDirectory, configuration);
     }
 
     /**
      * Initializes resources attribute excluding AsciiDoc documents, internal directories/files (those prefixed with
      * underscore), and docinfo files.
-     * By default everything in the sources directories is copied.
+     * By default, everything in the sources directories is copied.
      *
      * @return Collection of resources with properly configured includes and excludes conditions.
      */
@@ -116,10 +116,22 @@ private List<Resource> prepareResources(File sourceDirectory, AsciidoctorMojo co
      *
      * @param resources       Collection of {@link Resource} defining what resources to {@code outputDirectory}.
      * @param outputDirectory Directory where to copy resources.
+     * @param configuration   Project configuration
      */
-    private void copyResources(List<Resource> resources, File outputDirectory) {
+    private void copyResources(List<Resource> resources, File outputDirectory, AsciidoctorMojo configuration) {
 
         resources.stream()
+            .map(resource -> {
+                final File candidate = new File(resource.getDirectory());
+                final File sourceDir = candidate.isAbsolute() ? candidate : new File(configuration.getProjectDirectory(), resource.getDirectory());
+
+                final Resource sanitizedResource = new Resource();
+                sanitizedResource.setDirectory(sourceDir.getAbsolutePath());
+                sanitizedResource.setTargetPath(resource.getTargetPath());
+                sanitizedResource.setIncludes(resource.getIncludes());
+                sanitizedResource.setExcludes(resource.getExcludes());
+                return sanitizedResource;
+            })
             .filter(resource -> new File(resource.getDirectory()).exists())
             .forEach(resource -> {
                 DirectoryScanner directoryScanner = new DirectoryScanner();