1 files changed, 37 insertions, 6 deletions
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
index 40d9453..db757ce 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
@@ -11,9 +11,13 @@ import org.zwobble.sourcetext.SourceText;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.FileVisitResult;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
+import java.util.List;
 
 public class HobgoblinCompiler {
     public static final String FILE_NAME_EXTENSION = ".hob";
@@ -26,8 +30,6 @@ public class HobgoblinCompiler {
         var generators = config.createGenerators();
 
         var sourceDirectory = projectRoot.resolve("src");
-        var sourceFiles = sourceDirectory.toFile()
-            .listFiles(file -> file.toPath().toString().endsWith(FILE_NAME_EXTENSION));
 
         var typedNamespaceNodes = new ArrayList<TypedNamespaceNode>();
 
@@ -36,10 +38,10 @@ public class HobgoblinCompiler {
         typeCheckerContext.addNativeType(NativeTypes.STRING);
         typeCheckerContext.addNativeTypeConstructor(NativeTypes.LIST);
 
-        for (var sourceFile : sourceFiles) {
-            var namespaceName = sourceFileNamespaceName(sourceDirectory, sourceFile.toPath());
-            var sourceContents = Files.readString(sourceFile.toPath(), StandardCharsets.UTF_8);
-            var sourceText = SourceText.fromString(sourceFile.toPath().toString(), sourceContents);
+        for (var sourceFile : collectSourceFiles(sourceDirectory)) {
+            var namespaceName = sourceFileNamespaceName(sourceDirectory, sourceFile);
+            var sourceContents = Files.readString(sourceFile, StandardCharsets.UTF_8);
+            var sourceText = SourceText.fromString(sourceFile.toString(), sourceContents);
             var untypedNamespaceNode = Parser.parseNamespace(sourceText, namespaceName);
 
             var typedNamespaceNode = TypeChecker.typeCheckNamespace(untypedNamespaceNode, typeCheckerContext);
@@ -67,4 +69,33 @@ public class HobgoblinCompiler {
 
         return new NamespaceName(parts);
     }
+
+    private static List<Path> collectSourceFiles(
+        Path sourceRoot
+    ) throws IOException {
+        var sourceFiles = new ArrayList<Path>();
+
+        Files.walkFileTree(sourceRoot, new SimpleFileVisitor<Path>() {
+            @Override
+            public FileVisitResult visitFile(
+                Path file,
+                BasicFileAttributes attrs
+            ) {
+                if (file.toString().endsWith(FILE_NAME_EXTENSION)) {
+                    sourceFiles.add(file);
+                }
+                return FileVisitResult.CONTINUE;
+            }
+
+            @Override
+            public FileVisitResult postVisitDirectory(
+                Path dir,
+                IOException exc
+            ) {
+                return FileVisitResult.CONTINUE;
+            }
+        });
+        sourceFiles.sort(null);
+        return sourceFiles;
+    }
 }