Allow folders as classpath entries

The IJ parser allows for folders to be part of the classpath.
This behaviour is useful for supplying folders of compiled .class or
source files.

Author: lynxplay

cli/src/main/java/net/neoforged/jst/cli/intellij/ClasspathSetup.java

@@ -104,7 +104,8 @@ public static void addLibrary(Logger logger, Path libraryPath, IntelliJEnvironme
         if (!Files.exists(libraryPath)) {
             throw new UncheckedIOException(new NoSuchFileException(libraryPath.toString()));
         }
-        ijEnv.addJarToClassPath(libraryPath);
+        if (Files.isDirectory(libraryPath)) ijEnv.addFolderToClasspath(libraryPath);
+        else ijEnv.addJarToClassPath(libraryPath);
         logger.debug("Added %s", libraryPath);
     }
 }

tests/data/accesstransformer/folder_classpath_entry/accesstransformer.cfg

@@ -0,0 +1 @@
+public C1 get()La/b/c/Reference;

tests/data/accesstransformer/folder_classpath_entry/deps/a/b/c/Reference.java

@@ -0,0 +1,5 @@
+package a.b.c;
+
+public record Reference(int a) {
+
+}

tests/data/accesstransformer/folder_classpath_entry/expected/C1.java

@@ -0,0 +1,7 @@
+import a.b.c.Reference;
+
+public class C1 {
+    public Reference get() {
+        return new Reference(1);
+    }
+}

tests/data/accesstransformer/folder_classpath_entry/source/C1.java

@@ -0,0 +1,7 @@
+import a.b.c.Reference;
+
+public class C1 {
+    private Reference get() {
+        return new Reference(1);
+    }
+}

tests/src/test/java/net/neoforged/jst/tests/EmbeddedTest.java

@@ -302,6 +302,11 @@ void testMethodsInheritance() throws Exception {
         void testHiddenPrefixes() throws Exception {
             runATTest("hidden_prefix", "--hidden-prefix=other");
         }
+
+        @Test
+        void testFolderClasspathEntries() throws Exception {
+            runATTest("folder_classpath_entry", "--classpath=" + testDataRoot.resolve("accesstransformer/folder_classpath_entry/deps"));
+        }
     }
 
     @Nested