Improve rendering of DAG preview

src/main/java/nextflow/lsp/NextflowLanguageServer.java

@@ -450,6 +450,8 @@ public void didChangeConfiguration(DidChangeConfigurationParams params) {
 
         var oldConfiguration = configuration;
         configuration = new LanguageServerConfiguration(
+            withDefault(JsonUtils.getString(settings, "nextflow.dag.direction"), configuration.dagDirection()),
+            withDefault(JsonUtils.getBoolean(settings, "nextflow.dag.verbose"), configuration.dagVerbose()),
             withDefault(errorReportingMode(settings), configuration.errorReportingMode()),
             withDefault(JsonUtils.getStringArray(settings, "nextflow.files.exclude"), configuration.excludePatterns()),
             withDefault(JsonUtils.getBoolean(settings, "nextflow.completion.extended"), configuration.extendedCompletion()),
@@ -553,14 +555,14 @@ public CompletableFuture<Object> executeCommand(ExecuteCommandParams params) {
                 var uri = JsonUtils.getString(arguments.get(0));
                 var service = getLanguageService(uri);
                 if( service != null )
-                    return service.executeCommand(command, arguments);
+                    return service.executeCommand(command, arguments, configuration);
             }
             if( "nextflow.server.previewWorkspace".equals(command) && arguments.size() == 1 ) {
                 log.debug(String.format("textDocument/previewWorkspace %s", arguments.toString()));
                 var name = JsonUtils.getString(arguments.get(0));
                 var service = scriptServices.get(name);
                 if( service != null )
-                    return service.executeCommand(command, arguments);
+                    return service.executeCommand(command, arguments, configuration);
             }
             return null;
         });

src/main/java/nextflow/lsp/services/LanguageServerConfiguration.java

@@ -19,6 +19,8 @@
 import java.util.List;
 
 public record LanguageServerConfiguration(
+    String dagDirection,
+    boolean dagVerbose,
     ErrorReportingMode errorReportingMode,
     List<String> excludePatterns,
     boolean extendedCompletion,
@@ -31,6 +33,8 @@ public record LanguageServerConfiguration(
 
     public static LanguageServerConfiguration defaults() {
         return new LanguageServerConfiguration(
+            "TB",
+            false,
             ErrorReportingMode.WARNINGS,
             Collections.emptyList(),
             false,

src/main/java/nextflow/lsp/services/LanguageService.java

@@ -230,7 +230,7 @@ public List<Either<SymbolInformation, DocumentSymbol>> documentSymbol(DocumentSy
         return provider.documentSymbol(params.getTextDocument());
     }
 
-    public Object executeCommand(String command, List<Object> arguments) {
+    public Object executeCommand(String command, List<Object> arguments, LanguageServerConfiguration configuration) {
         return null;
     }
 

src/main/java/nextflow/lsp/services/script/ScriptCodeLensProvider.java

@@ -70,23 +70,23 @@ public List<CodeLens> codeLens(TextDocumentIdentifier textDocument) {
         return result;
     }
 
-    public Map<String,String> previewDag(String documentUri, String name) {
+    public Map<String,String> previewDag(String documentUri, String name, String direction, boolean verbose) {
         var uri = URI.create(documentUri);
         if( !ast.hasAST(uri) || ast.hasErrors(uri) )
-            return Map.ofEntries(Map.entry("error", "DAG preview cannot be shown because the script has errors."));
+            return Map.of("error", "DAG preview cannot be shown because the script has errors.");
 
         var sourceUnit = ast.getSourceUnit(uri);
         return ast.getWorkflowNodes(uri).stream()
             .filter(wn -> wn.isEntry() ? name == null : wn.getName().equals(name))
             .findFirst()
             .map((wn) -> {
-                var visitor = new DataflowVisitor(sourceUnit, ast);
+                var visitor = new DataflowVisitor(sourceUnit, ast, verbose);
                 visitor.visit();
 
                 var graph = visitor.getGraph(wn.isEntry() ? "<entry>" : wn.getName());
-                var result = new MermaidRenderer().render(wn.getName(), graph);
+                var result = new MermaidRenderer(direction, verbose).render(wn.getName(), graph);
                 log.debug(result);
-                return Map.ofEntries(Map.entry("result", result));
+                return Map.of("result", result);
             })
             .orElse(null);
     }

src/main/java/nextflow/lsp/services/script/ScriptService.java

@@ -121,13 +121,13 @@ protected SymbolProvider getSymbolProvider() {
     }
 
     @Override
-    public Object executeCommand(String command, List<Object> arguments) {
+    public Object executeCommand(String command, List<Object> arguments, LanguageServerConfiguration configuration) {
         updateNow();
         if( "nextflow.server.previewDag".equals(command) && arguments.size() == 2 ) {
             var uri = getJsonString(arguments.get(0));
             var name = getJsonString(arguments.get(1));
             var provider = new ScriptCodeLensProvider(astCache);
-            return provider.previewDag(uri, name);
+            return provider.previewDag(uri, name, configuration.dagDirection(), configuration.dagVerbose());
         }
         if( "nextflow.server.previewWorkspace".equals(command) ) {
             var provider = new WorkspacePreviewProvider(astCache);