Fixes #251.

changelog.md

@@ -8,6 +8,7 @@
 - structurizr-client: Removes `StructurizrClient` (use `WorkspaceApiClient` instead).
 - structurizr-import: Adds support for importing decisions managed by Log4brains.
 - structurizr-import: Adds support for importing decisions in MADR format.
+- structurizr-import: Fixes https://github.com/structurizr/java/issues/251 (Importing docs fails on files without extension).
 - structurizr-dsl: Adds `!decisions` as a synonym for `!adrs`.
 - structurizr-dsl: Allows `!identifiers` to be used inside `model`.
 - structurizr-inspection: Initial version.

structurizr-import/src/main/java/com/structurizr/importer/documentation/FormatFinder.java

@@ -10,13 +10,17 @@
 public class FormatFinder {
 
     private static final Set<String> MARKDOWN_EXTENSIONS = new HashSet<>(Arrays.asList(".md", ".markdown", ".text"));
-
     private static final Set<String> ASCIIDOC_EXTENSIONS = new HashSet<>(Arrays.asList(".asciidoc", ".adoc", ".asc"));
+    private static final String DOT = ".";
 
     public static boolean isMarkdownOrAsciiDoc(File file) {
-        String extension = file.getName().substring(file.getName().lastIndexOf("."));
+        if (file.getName().contains(DOT)) {
+            String extension = file.getName().substring(file.getName().lastIndexOf(DOT));
+
+            return MARKDOWN_EXTENSIONS.contains(extension) || ASCIIDOC_EXTENSIONS.contains(extension);
+        }
 
-        return MARKDOWN_EXTENSIONS.contains(extension) || ASCIIDOC_EXTENSIONS.contains(extension);
+        return false;
     }
 
     public static Format findFormat(File file) {

structurizr-import/src/test/resources/docs/docs/file_without_extension

@@ -0,0 +1 @@
+This file should be ignored.