Treat dot files and folders as internal

src/main/java/org/asciidoctor/maven/io/AsciidoctorFileScanner.java

@@ -24,6 +24,7 @@ public class AsciidoctorFileScanner {
     public static String[] INTERNAL_FOLDERS_AND_FILES_PATTERNS = {
             "**/_*.*",
             "**/_*",
+            "**/.*",
             "**/_*/**/*.*",
     };
 
@@ -40,7 +41,8 @@ public class AsciidoctorFileScanner {
             "docinfo-footer.xml",
             "*-docinfo.xml",
             "*-docinfo-header.xml",
-            "*-docinfo-footer.xml"};
+            "*-docinfo-footer.xml"
+    };
 
 
     private final BuildContext buildContext;

src/main/java/org/asciidoctor/maven/process/SourceDocumentFinder.java

@@ -59,7 +59,8 @@ private List<File> find(Path sourceDirectory, Pattern sourceDocumentPattern) {
                     .filter(path -> sourceDocumentPattern.matcher(path.getFileName().toString()).matches())
                     .filter(path -> {
                         for (Path part : sourceDirectory.relativize(path)) {
-                            if (part.toString().startsWith("_")) {
+                            char firstCharacter = part.toString().charAt(0);
+                            if (firstCharacter == '_' || firstCharacter == '.') {
                                 return false;
                             }
                         }

src/test/java/org/asciidoctor/maven/AsciidoctorMojoTest.java

@@ -667,9 +667,11 @@ public void should_not_copy_custom_source_documents_when_custom_extensions_are_s
      */
     private void assertEqualsStructure(File[] expected, File[] actual) {
 
-
         List<File> sanitizedExpected = Arrays.stream(expected)
-                .filter(file -> !file.getName().startsWith("_"))
+                .filter(file -> {
+                    char firstChar = file.getName().charAt(0);
+                    return firstChar != '_' && firstChar != '.';
+                })
                 .collect(Collectors.toList());
 
         List<String> expectedNames = sanitizedExpected.stream().map(File::getName).collect(Collectors.toList());
@@ -691,7 +693,7 @@ private void assertEqualsStructure(File[] expected, File[] actual) {
             if (htmls.length > 0) {
                 File[] asciidocs = expectedFile.listFiles(f -> {
                     String asciidocFilePattern = ".*\\." + AsciidoctorFileScanner.ASCIIDOC_FILE_EXTENSIONS_REG_EXP + "$";
-                    return f.getName().matches(asciidocFilePattern) && !f.getName().startsWith("_");
+                    return f.getName().matches(asciidocFilePattern) && !f.getName().startsWith("_") && !f.getName().startsWith(".");
                 });
                 Assertions.assertThat(htmls).hasSize(asciidocs.length);
             }

src/test/java/org/asciidoctor/maven/process/SourceDocumentFinderTest.java

@@ -105,7 +105,7 @@ public void should_exclude_hidden_sources() {
         // then
         assertThat(files)
                 .hasSize(6)
-                .allMatch(file -> !file.getName().startsWith("_"));
+                .allMatch(file -> !file.getName().startsWith("_") || !file.getName().startsWith("."));
     }
 
     @Test
@@ -144,7 +144,7 @@ private boolean isContainedInInternalDirectory(File file) {
         int cursor = 0;
         do {
             cursor = path.indexOf(File.separator, cursor + 1);
-            if (path.charAt(cursor + 1) == '_')
+            if (path.charAt(cursor + 1) == '_' || path.charAt(cursor + 1) == '.')
                 return true;
         } while (cursor != -1);
         return false;

src/test/resources/src/asciidoctor/relative-path-treatment/.these_sources_are_not_processed/ignored.adoc

@@ -0,0 +1,8 @@
+:toc: left
+:icons:
+
+== Summary
+This document won't get converted by default because it is inside a hidden folder. +
+Hidden folders begin with underscore `.`.
+
+TIP: How cool is this?

src/test/resources/src/asciidoctor/relative-path-treatment/level-1-1/.internal-dot-partial.adoc

@@ -0,0 +1,8 @@
+:toc: left
+:icons:
+
+== Summary
+This document won't get converted by default because it considered "internal". +
+That is, is prefixed with a dot `.`.
+
+TIP: How cool is this?