feat(output-name): add option for outputName

* document output and outputName

Author: marcjulian

README.md

@@ -105,6 +105,23 @@ Ref: Post.authorId > User.id
 
 4. [Visualize](https://dbdiagram.io/d) the `schema.dbml`
 
+## Additional Options
+
+| Option       |  Description                       | Type     |  Default      |
+| ------------ | ---------------------------------- | -------- | ------------- |
+| `output`     | Output directory for the DBML file | `string` | `./dbml`      |
+| `outputName` | Name for the DBML file             | `string` | `dbml.schema` |
+
+Use additional options in the `prisma.schema`
+
+```prisma
+generator dbml {
+  provider   = "prisma-dbml-generator"
+  output     = "../dbml"
+  outputName = "awesome.dbml"
+}
+```
+
 ## Development
 
 ```bash

prisma/dbml/schema.dbml

@@ -11,7 +11,9 @@ generator client {
 }
 
 generator dbml {
-  provider = "node ./dist/generator.js"
+  provider   = "node ./dist/generator.js"
+  output     = "../dbml"
+  outputName = "awesome.dbml"
 }
 
 model User {

prisma/schema.prisma

@@ -5,24 +5,23 @@ import { join } from 'path';
 
 const { mkdir, writeFile } = promises;
 
+export const defaultDBMLFileName = 'schema.dbml';
+
 export async function generate(options: GeneratorOptions) {
-  if (options.generator.output) {
-    try {
-      await mkdir(options.generator.output, { recursive: true });
+  const outputDir = options.generator.output!;
+  const dbmlFileName =
+    options.generator.config.outputName || defaultDBMLFileName;
+
+  try {
+    await mkdir(outputDir, { recursive: true });
 
-      // await writeFile('./test.json', JSON.stringify(options.dmmf.datamodel));
+    // await writeFile('./test.json', JSON.stringify(options.dmmf.datamodel));
 
-      const dbmlSchema = generateDBMLSchema(options.dmmf);
+    const dbmlSchema = generateDBMLSchema(options.dmmf);
 
-      await writeFile(
-        join(options.generator.output, 'schema.dbml'),
-        dbmlSchema
-      );
-    } catch (e) {
-      console.error('Error: unable to write files for Prisma DBML Generator');
-      throw e;
-    }
-  } else {
-    throw new Error('No output was specified for Prisma DBML Generator');
+    await writeFile(join(outputDir, dbmlFileName), dbmlSchema);
+  } catch (e) {
+    console.error('Error: unable to write files for Prisma DBML Generator');
+    throw e;
   }
 }