Add an option to warn about misses in the artifact manifest

src/main/java/net/neoforged/neoform/runtime/artifacts/ArtifactManager.java

@@ -7,6 +7,7 @@
 import net.neoforged.neoform.runtime.manifests.LauncherManifest;
 import net.neoforged.neoform.runtime.manifests.MinecraftLibrary;
 import net.neoforged.neoform.runtime.manifests.MinecraftVersionManifest;
+import net.neoforged.neoform.runtime.utils.AnsiColor;
 import net.neoforged.neoform.runtime.utils.FilenameUtil;
 import net.neoforged.neoform.runtime.utils.Logger;
 import net.neoforged.neoform.runtime.utils.MavenCoordinate;
@@ -38,6 +39,7 @@ public class ArtifactManager {
     private final URI launcherManifestUrl;
     private final Path artifactsCache;
     private final Map<MavenCoordinate, Artifact> externallyProvided = new HashMap<>();
+    private boolean warnOnArtifactManifestMiss;
 
     public ArtifactManager(List<URI> repositoryBaseUrls,
                            CacheManager cacheManager,
@@ -62,6 +64,8 @@ public Artifact get(MinecraftLibrary library) throws IOException {
         var artifactCoordinate = MavenCoordinate.parse(library.artifactId());
         if (externallyProvided.containsKey(artifactCoordinate)) {
             return externallyProvided.get(artifactCoordinate);
+        } else if (warnOnArtifactManifestMiss && !externallyProvided.isEmpty()) {
+            LOG.println("  " + AnsiColor.YELLOW + "WARNING: " + AnsiColor.RESET + library.artifactId() + " is not present in the artifact manifest");
         }
 
         var finalLocation = artifactsCache.resolve(artifactCoordinate.toRelativeRepositoryPath());
@@ -255,4 +259,12 @@ private Artifact download(Path finalLocation, URI uri) throws IOException {
     private Artifact download(Path finalLocation, DownloadSpec spec) throws IOException {
         return download(finalLocation, () -> downloadManager.download(spec, finalLocation));
     }
+
+    public boolean isWarnOnArtifactManifestMiss() {
+        return warnOnArtifactManifestMiss;
+    }
+
+    public void setWarnOnArtifactManifestMiss(boolean warnOnArtifactManifestMiss) {
+        this.warnOnArtifactManifestMiss = warnOnArtifactManifestMiss;
+    }
 }

src/main/java/net/neoforged/neoform/runtime/cli/Main.java

@@ -32,7 +32,10 @@ public class Main {
     @Option(names = "--artifact-manifest", scope = ScopeType.INHERIT)
     Path artifactManifest;
 
-    @CommandLine.Option(names = "--launcher-meta-uri", scope = CommandLine.ScopeType.INHERIT)
+    @Option(names = "--warn-on-artifact-manifest-miss", scope = ScopeType.INHERIT, description = "Warns when an artifact manifest is given, but a file is being downloaded that is not in the manifest.")
+    boolean warnOnArtifactManifestMiss;
+
+    @Option(names = "--launcher-meta-uri", scope = ScopeType.INHERIT)
     URI launcherManifestUrl = URI.create("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json");
 
     @Option(names = "--verbose", description = "Enable verbose output", scope = ScopeType.INHERIT)

src/main/java/net/neoforged/neoform/runtime/cli/NeoFormEngineCommand.java

@@ -65,6 +65,7 @@ public final Integer call() throws Exception {
 
             lockManager.setVerbose(commonOptions.verbose);
             var artifactManager = new ArtifactManager(commonOptions.getEffectiveRepositories(), cacheManager, downloadManager, lockManager, commonOptions.launcherManifestUrl);
+            artifactManager.setWarnOnArtifactManifestMiss(commonOptions.warnOnArtifactManifestMiss);
 
             if (commonOptions.artifactManifest != null) {
                 artifactManager.loadArtifactManifest(commonOptions.artifactManifest);

src/main/java/net/neoforged/neoform/runtime/utils/AnsiColor.java

@@ -5,6 +5,8 @@ public enum AnsiColor {
     //Color end string, color reset
     RESET("0"),
 
+    YELLOW("33"),
+
     BOLD("1"),
     ITALIC("3"),
     UNDERLINE("4"),