feat(cli): add "format" command

packages/auth-adapters/better-auth/src/schema-generator.ts

@@ -1,5 +1,5 @@
 import { lowerCaseFirst, upperCaseFirst } from '@zenstackhq/common-helpers';
-import { loadDocument, ZModelCodeGenerator } from '@zenstackhq/language';
+import { formatDocument, loadDocument, ZModelCodeGenerator } from '@zenstackhq/language';
 import {
     Argument,
     ArrayExpr,
@@ -111,7 +111,13 @@ async function updateSchema(
     }
 
     const generator = new ZModelCodeGenerator();
-    const content = generator.generate(zmodel);
+    let content = generator.generate(zmodel);
+
+    try {
+        content = await formatDocument(content);
+    } catch {
+        // ignore formatting errors
+    }
 
     return content;
 }

packages/cli/src/actions/format.ts

@@ -0,0 +1,27 @@
+import { formatDocument } from '@zenstackhq/language';
+import colors from 'colors';
+import fs from 'node:fs';
+import { getSchemaFile } from './action-utils';
+
+type Options = {
+    schema?: string;
+};
+
+/**
+ * CLI action for formatting a ZModel schema file.
+ */
+export async function run(options: Options) {
+    const schemaFile = getSchemaFile(options.schema);
+    let formattedContent: string;
+
+    try {
+        formattedContent = await formatDocument(fs.readFileSync(schemaFile, 'utf-8'));
+    } catch (error) {
+        console.error(colors.red('✗ Schema formatting failed.'));
+        // Re-throw to maintain CLI exit code behavior
+        throw error;
+    }
+
+    fs.writeFileSync(schemaFile, formattedContent, 'utf-8');
+    console.log(colors.green('✓ Schema formatting completed successfully.'));
+}

packages/cli/src/actions/index.ts

@@ -1,8 +1,9 @@
+import { run as check } from './check';
 import { run as db } from './db';
+import { run as format } from './format';
 import { run as generate } from './generate';
 import { run as info } from './info';
 import { run as init } from './init';
 import { run as migrate } from './migrate';
-import { run as check } from './check';
 
-export { db, generate, info, init, migrate, check };
+export { check, db, format, generate, info, init, migrate };

packages/cli/src/index.ts

@@ -30,6 +30,10 @@ const checkAction = async (options: Parameters<typeof actions.check>[0]): Promis
     await telemetry.trackCommand('check', () => actions.check(options));
 };
 
+const formatAction = async (options: Parameters<typeof actions.format>[0]): Promise<void> => {
+    await telemetry.trackCommand('format', () => actions.format(options));
+};
+
 function createProgram() {
     const program = new Command('zen')
         .alias('zenstack')
@@ -145,6 +149,13 @@ function createProgram() {
         .addOption(noVersionCheckOption)
         .action(checkAction);
 
+    program
+        .command('format')
+        .description('Format a ZModel schema file')
+        .addOption(schemaOption)
+        .addOption(noVersionCheckOption)
+        .action(formatAction);
+
     program.addHelpCommand('help [command]', 'Display help for a command');
 
     program.hook('preAction', async (_thisCommand, actionCommand) => {

packages/cli/test/format.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from 'vitest';
+import { createProject, runCli } from './utils';
+import fs from 'node:fs';
+
+const model = `
+model User {
+  id String @id @default(cuid())
+    email String @unique
+}
+`;
+
+describe('CLI format command test', () => {
+    it('should format a valid schema successfully', () => {
+        const workDir = createProject(model);
+        expect(() => runCli('format', workDir)).not.toThrow();
+        const updatedContent = fs.readFileSync(`${workDir}/zenstack/schema.zmodel`, 'utf-8');
+        expect(
+            updatedContent.includes(`model User {
+    id    String @id @default(cuid())
+    email String @unique
+}`),
+        ).toBeTruthy();
+    });
+
+    it('should silently ignore invalid schema', () => {
+        const invalidModel = `
+model User {
+  id String @id @default(cuid())
+`;
+        const workDir = createProject(invalidModel);
+        expect(() => runCli('format', workDir)).not.toThrow();
+    });
+});

packages/language/src/document.ts

@@ -1,11 +1,20 @@
-import { isAstNode, URI, type AstNode, type LangiumDocument, type LangiumDocuments, type Mutable } from 'langium';
+import {
+    isAstNode,
+    TextDocument,
+    URI,
+    type AstNode,
+    type LangiumDocument,
+    type LangiumDocuments,
+    type Mutable,
+} from 'langium';
 import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { isDataSource, type Model } from './ast';
 import { STD_LIB_MODULE_NAME } from './constants';
 import { createZModelServices } from './module';
 import { getDataModelAndTypeDefs, getDocument, hasAttribute, resolveImport, resolveTransitiveImports } from './utils';
+import type { ZModelFormatter } from './zmodel-formatter';
 
 /**
  * Loads ZModel document from the given file name. Include the additional document
@@ -200,3 +209,20 @@ function validationAfterImportMerge(model: Model) {
     }
     return errors;
 }
+
+/**
+ * Formats the given ZModel content.
+ */
+export async function formatDocument(content: string) {
+    const services = createZModelServices().ZModelLanguage;
+    const langiumDocuments = services.shared.workspace.LangiumDocuments;
+    const document = langiumDocuments.createDocument(URI.parse('memory://schema.zmodel'), content);
+    const formatter = services.lsp.Formatter as ZModelFormatter;
+    const identifier = { uri: document.uri.toString() };
+    const options = formatter.getFormatOptions() ?? {
+        insertSpaces: true,
+        tabSize: 4,
+    };
+    const edits = await formatter.formatDocument(document, { options, textDocument: identifier });
+    return TextDocument.applyEdits(document.textDocument, edits);
+}

packages/language/src/index.ts

@@ -1,3 +1,3 @@
-export { loadDocument } from './document';
+export { formatDocument, loadDocument } from './document';
 export * from './module';
 export { ZModelCodeGenerator } from './zmodel-code-generator';