feat: Java support (#2)

Add java support

Author: campionfellin

README.md

@@ -67,7 +67,73 @@ The output directory will include a python module that corresponds to the
 original module. This code depends on the following python modules:
 
 - [jsii](https://pypi.org/project/jsii/)
-- [publication](https://pypi.org/project/publication/)
+
+### Java Output
+
+To produce a Java module from your source, use the `java` option:
+
+```ts
+await srcmak('srcdir', {
+  java: {
+    outdir: '/path/to/project/root',
+    package: 'hello.world'
+  }
+});
+```
+
+Or the `--java-*` switches in the CLI:
+
+```bash
+$ jsii-srcmak /src/dir --java-outdir=dir --java-package=hello.world
+```
+
+* The `outdir`/`--java-outdir` option points to the root directory of your Java project.
+* The `package`/`--java-package` option is the java package name.
+
+The output directory will include a java module that corresponds to the
+original module. This code depends on the following maven package (should be defined directly or indirectly in the project's `pom.xml` file):
+
+- [jsii](https://mvnrepository.com/artifact/software.amazon.jsii)
+
+The output directory will also include a tarbell `generated@0.0.0.jsii.tgz` that must be bundled in your project. Here is example snippet of how your `pom.xml` can take a dependency on these sources:
+
+1. Using the `build-helper-maven-plugin` generate source files for your import.
+
+```xml
+<plugin>
+  <groupId>org.codehaus.mojo</groupId>
+  <artifactId>build-helper-maven-plugin</artifactId>
+  <version>3.0.0</version>
+  <executions>
+      <execution>
+          <phase>generate-sources</phase>
+          <goals>
+              <goal>add-source</goal>
+          </goals>
+          <configuration>
+              <sources>
+                  <source>imports/src/main/k8s/main/java</source>
+              </sources>
+          </configuration>
+      </execution>
+  </executions>
+</plugin>
+```
+
+2. Set additional classpath elements for your import.
+
+```xml
+<plugin>
+  <groupId>org.apache.maven.plugins</groupId>
+  <artifactId>maven-surefire-plugin</artifactId>
+  <version>2.12.4</version>
+  <configuration>
+    <additionalClasspathElements>
+      <additionalClasspathElement>imports/src/main/k8s/main/java</additionalClasspathElement>
+    </additionalClasspathElements>
+  </configuration>
+</plugin>
+```
 
 ### Entrypoint
 
@@ -115,6 +181,21 @@ Or through the CLI:
 $ jsii-srcmak /src/dir --dep node_modules/@types/node --dep node_modules/constructs
 ```
 
+## Contributing
+
+To build this project, you must first generate the `package.json`:
+
+```
+npx projen
+```
+
+Then you can install your dependencies and build:
+
+```
+yarn install
+yarn build
+```
+
 ## What's with this name?
 
 It's a silly little pun that stems from another pun: jsii has `jsii-pacmak`

bin/jsii-srcmak.ts

@@ -9,6 +9,8 @@ async function main() {
     .option('jsii-path', { desc: 'write .jsii output to this path', type: 'string' })
     .option('python-outdir', { desc: 'python output directory (requires --python-module-name)', type: 'string' })
     .option('python-module-name', { desc: 'python module name', type: 'string' })
+    .option('java-outdir', { desc: 'java output directory (requires --java-package)', type: 'string' })
+    .option('java-package', { desc: 'the java package (namespace) to use for all generated types', type: 'string' })
     .showHelpOnFail(true)
     .help();
 
@@ -27,6 +29,7 @@ async function main() {
     ...parseDepOption(),
     ...parseJsiiOptions(),
     ...parsePythonOptions(),
+    ...parseJavaOptions(),
   });
 
   function parseJsiiOptions() {
@@ -53,6 +56,20 @@ async function main() {
     }
   }
 
+  function parseJavaOptions() {
+    const outdir = argv['java-outdir'];
+    const packageName = argv['java-package'];
+    if (!outdir && !packageName) { return undefined; }
+    if (!outdir) { throw new Error('--java-outdir is required'); }
+    if (!packageName) { throw new Error('--java-package is required'); }
+    return {
+      java: {
+        outdir: outdir,
+        package: packageName,
+      },
+    }
+  }
+
   function parseDepOption() {
     if (argv.dep?.length === 0) { return undefined; }
     return {

lib/compile.ts

@@ -70,6 +70,16 @@ export async function compile(workdir: string, options: Options) {
     };
   }
 
+  if (options.java) {
+    targets.java = {
+      package: options.java.package,
+      maven: {
+        groupId: 'generated',
+        artifactId: 'generated',
+      },
+    };
+  }
+
   await fs.writeFile(path.join(workdir, 'package.json'), JSON.stringify(pkg, undefined, 2));
 
   await exec(compilerModule, args, {

lib/options.ts

@@ -23,6 +23,13 @@ export interface Options {
    * @default - python is not generated
    */
   python?: PythonOutputOptions;
+
+  /**
+   * Produces java code under src/main/yourpackage/main/java/yourpackage/
+   * 
+   * @default - java is not generated
+   */
+  java?: JavaOutputOptions;
 }
 
 export interface JsiiOutputOptions {
@@ -43,3 +50,15 @@ export interface PythonOutputOptions {
    */
   moduleName: string;
 }
+
+export interface JavaOutputOptions {
+  /**
+   * Base root directory.
+   */
+  outdir: string;
+
+  /**
+   * The name of the java package to generate
+   */
+  package: string;
+}

lib/srcmak.ts

@@ -33,5 +33,12 @@ export async function srcmak(srcdir: string, options: Options = { }) {
       const target = path.join(options.python.outdir, reldir);
       await fs.move(source, target, { overwrite: true });
     }
+    
+    if (options.java) {
+      const reldir = options.java.package.replace(/\./g, '/');
+      const source = path.resolve(path.join(workdir, 'dist/java/src/'));
+      const target = path.join(options.java.outdir, 'src/main', reldir);
+      await fs.move(source, target, { overwrite: true });
+    }
   });
 }