# Developing NetBeans based Extension for VS Code

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## Prerequisities

- JDK, version 11 or later
- Ant, latest version
- Maven, latest version
- node.js, latest LTS (to build VSIX)


## Getting the Code

```bash
$ git clone https://github.com/apache/netbeans.git
$ cd netbeans/
```

## Building

To build the VS Code extension invoke:

```bash
netbeans$ ant build
netbeans$ cd java/java.lsp.server
java.lsp.server$ ant build-vscode-ext
```
The resulting extension is then in the `build` directory, with the `.vsix` extension.
The typical file name is `apache-netbeans-java-0.1.0.vsix` - the version can be
changed by using the `-Dvsix.version=x.y.z` property - that's what
[continuous integration server](https://ci-builds.apache.org/job/Netbeans/job/netbeans-vscode/)
and release builders do.

### Building for Development

If you want to develop the extension, use these steps for building instead:

```bash
netbeans$ cd java/java.lsp.server
java.lsp.server$ ant build-lsp-server
java.lsp.server$ cd vscode
vscode$ npm install
vscode$ npm run watch
```

This target is faster than building the `.vsix` file. Find the instructions
for running and debugging below.

### Cleaning

Often it is also important to properly clean everything. Use:

```bash
java.lsp.server$ ant clean-vscode-ext
java.lsp.server$ cd ../..
netbeans$ ant clean
```

### Testing

The `java.lsp.server` module has classical (as other NetBeans modules) tests.
The most important one is [ServerTest](https://github.com/apache/netbeans/blob/master/java/java.lsp.server/test/unit/src/org/netbeans/modules/java/lsp/server/protocol/ServerTest.java)
which simulates LSP communication and checks expected replies. In addition to
that there are VS Code integration tests - those launch VS Code with the
VSNetBeans extension and check behavior of the TypeScript integration code:

```bash
java.lsp.server$ ant build-vscode-ext # first and then
java.lsp.server$ ant test-vscode-ext
```

In case you are behind a proxy, you may want to run the tests with

```bash
java.lsp.server$ npm_config_https_proxy=http://your.proxy.com:port ant test-vscode-ext
```

when executing the tests for the first time. That shall overcome the proxy
and download an instance of `code` to execute the tests with.

### Eating our own Dog Food

Using the application yourself is the best way of testing! If you want to
_edit/compile/debug_ Apache NetBeans sources, there is a way. After building
the project, execute:

```bash
vscode$ npm run apisupport
```

the system connects to associated autoupdate center and downloads, installs
and enables `org.netbeans.modules.apisupport.ant` module. With such module installed
one can open Apache NetBeans projects and work with them directly from VSCode.

## Running and Debugging

To use the extension created for developement you can run VS Code with
following parameter:

```bash
vscode$ code --extensionDevelopmentPath=`pwd` path_to_project
```

Or you can open the `vscode` folder in `code` directly and use **F5** to
debug the extension's *typescript code*.

To debug the *Java code*, launch the NetBeans part of the VS Code system first
and specify suitable debug arguments to start _standalone NBLS_ instance:

```bash
vscode$ npm run nbcode -- --jdkhome /jdk -J-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000
```

Connect to the process with Java debugger, setup all breakpoints. Then launch
the VS Code extension (which connects to the already running _standalone NBLS_ Java process):

```bash
vscode$ code --extensionDevelopmentPath=`pwd` path_to_the_maven_project
```

To start from a clean state, following
[CLI options](https://code.visualstudio.com/docs/editor/command-line)
maybe of an interest:
- `--user-data-dir` - clean any user settings with this option
- `--extensions-dir` - avoid 3rd party extensions using this option

**Important note**: when `--user-data-dir` is used, the _standalone NBLS_ must be start as
```bash
vscode$ nbcode_userdir=/the-code-user-data-dir npm run nbcode --  --jdkhome /jdk -J-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000
```
So that the vscode can connect to the _standalone NBLS_ instance.

### NBLS userdir locations
The default userdir location is inside the **global** vscode settings location:
- on Linux: `~/.config/Code/User/globalStorage//asf.apache-netbeans-java/userdir
- on MacOS X: ~/Library/Application Support/Code/User/globalStorage//asf.apache-netbeans-java/userdir

When the environment variable `nbcode_userdir` (to e.g. `/tmp/foo`) is set when starting vscode or nbcode (npm run nbcode), the userdir will point to `/tmp/foo/userdir`.

### Debug output 
_Standalone NBLS_ can be instructed to print messages (stderr, out) to the console: add `-J-Dnetbeans.logger.console=true` to the npm commandline. This has the same effect as `netbeans.verbose = true` settings in the vscode. Messages from the LSP protocol can be displayed in vscode by setting `java.trace.server = verbose` setting in vscode JSON settings.

### Debugging separately from global NBLS
By default the extension uses **global** userdir of the **global** vscode instance and uses NBLS data in there. In case this is not desired, the `launch.json` must be changed:
```
			"env": {
				"nbcode_userdir": "/path/to/development/area"
			}
```
When using _standalone NBLS_ at the same time, the NBLS must be started as
```bash
vscode$ user_data_dir=/path/to/development/area npm run nbcode -- --jdkhome /jdk -J-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000
```
This way the NBLS will use a separate config/cache directory and will not interfere with the default / global installation.