fix(core): export the Project block in the DBML exporter

packages/dbml-core/__tests__/examples/model_exporter/dbml_exporter/output/table_group_settings.out.dbml

@@ -1,3 +1,7 @@
+Project "a" {
+  database_type: '''aaa\'hehe'''
+}
+
 Enum "ecommerce"."products_status" {
   "out_of_stock"
   "in_stock"

packages/dbml-core/__tests__/examples/model_exporter/model_exporter.spec.ts

@@ -169,6 +169,36 @@ describe('@dbml/core - DbmlExporter flags', () => {
   });
 });
 
+describe('@dbml/core - DbmlExporter project', () => {
+  const DBML_WITH_PROJECT = `
+Project "project_name" {
+  database_type: 'PostgreSQL'
+  Note: 'Description of the project'
+}
+
+Table "users" {
+  "id" integer [pk]
+}`.trim();
+
+  test('exports the Project block', () => {
+    const database = (new Parser()).parse(DBML_WITH_PROJECT, 'dbmlv2');
+    const res = DbmlExporter.export(database.normalize(), { includeRecords: true });
+    expect(res.trim()).toBe(DBML_WITH_PROJECT);
+  });
+
+  test('exports a Project with only a note', () => {
+    const database = (new Parser()).parse(`Project {\n  Note: 'It\\'s a note'\n}`, 'dbmlv2');
+    const res = DbmlExporter.export(database.normalize(), { includeRecords: true });
+    expect(res.trim()).toBe(`Project {\n  Note: '''It\\'s a note'''\n}`);
+  });
+
+  test('exports nothing when there is no Project', () => {
+    const database = (new Parser()).parse('Table "users" {\n  "id" integer\n}', 'dbmlv2');
+    const res = DbmlExporter.export(database.normalize(), { includeRecords: true });
+    expect(res).not.toMatch(/^Project\b/m);
+  });
+});
+
 describe('@dbml/core - ModelExporter table groups', () => {
   test('does not schema-qualify TableGroup names', () => {
     const database = (new Parser()).parse(

packages/dbml-core/src/export/DbmlExporter.ts

@@ -531,11 +531,25 @@ class DbmlExporter {
     return blocks.join('\n');
   }
 
+  static exportProject (model: NormalizedModel): string {
+    const { name, databaseType, note } = model.database['1'];
+    if (!name && !databaseType && !note) return '';
+
+    const projectName = name ? ` "${name}"` : '';
+    const databaseTypeStr = databaseType ? `  database_type: ${DbmlExporter.escapeNote(databaseType)}\n` : '';
+    const noteStr = note ? `  Note: ${DbmlExporter.escapeNote(note)}\n` : '';
+
+    return `Project${projectName} {\n${databaseTypeStr}${noteStr}}\n`;
+  }
+
   static export (model: NormalizedModel, options: DbmlExporterOptions): string {
     const elementStrs: string[] = [];
     const database = model.database['1'];
     const { includeRecords } = options;
 
+    const projectStr = DbmlExporter.exportProject(model);
+    if (projectStr) elementStrs.push(projectStr);
+
     database.schemaIds.forEach((schemaId) => {
       const {
         enumIds, tableIds, tableGroupIds, refIds, depIds,