Add build script to download language server if not found

Signed-off-by: Hope Hadfield <[email protected]>

Author: hopehadfield

CONTRIBUTING.md

@@ -81,8 +81,11 @@ This assumes that you are starting on the `vscode-java` directory
 
 	```bash
 	$ cd ./vscode-java
-	$ npm run build-server
+	$ npm run build
 	```
+If the eclipse.jdt.ls directory is not found as a sibling directory (see the desired hierarchy in the previous step), a snapshot of the language server will be downloaded instead.
+
+To build the server using only the local eclipse.jdt.ls repository, use `npm run build-server`.
 
 **\*Optional:**
 You can run faster server builds during development by calling `npm run fast-build-server` script instead, this will build server binaries that are required by your host OS only. You can also use `npm run watch-server` which will build and place them on the extension for Java changes. These commands run Maven in offline mode, so you might need to run `build-server` at least once, to fetch all the dependencies.

gulpfile.js

@@ -13,6 +13,7 @@ const server_dir = '../eclipse.jdt.ls';
 const originalTestFolder = path.join(__dirname, 'test', 'resources', 'projects', 'maven', 'salut');
 const tempTestFolder = path.join(__dirname, 'test-temp');
 const testSettings = path.join(tempTestFolder, '.vscode', 'settings.json');
+const JDT_LS_SNAPSHOT_URL = "http://download.eclipse.org/jdtls/snapshots/jdt-language-server-latest.tar.gz"
 //...
 
 gulp.task('clean_jre', function (done) {
@@ -145,19 +146,23 @@ gulp.task('download_lombok', async function (done) {
 });
 
 gulp.task('download_server', function (done) {
-	fse.removeSync('./server');
-	download("http://download.eclipse.org/jdtls/snapshots/jdt-language-server-latest.tar.gz")
-		.pipe(decompress())
-		.pipe(gulp.dest('./server'));
+	download_server_fn();
 	done();
 });
 
 gulp.task('build_server', function (done) {
-	fse.removeSync('./server');
-	cp.execSync(mvnw() + ' -Pserver-distro clean package -Declipse.jdt.ls.skipGradleChecksums', { cwd: server_dir, stdio: [0, 1, 2] });
-	gulp.src(server_dir + '/org.eclipse.jdt.ls.product/distro/*.tar.gz')
-		.pipe(decompress())
-		.pipe(gulp.dest('./server'));
+	build_server_fn();
+	done();
+});
+
+gulp.task('build_or_download', function (done) {
+	if (!fse.existsSync(server_dir)) {
+		console.log('NOTE: eclipse.jdt.ls is not found as a sibling directory, downloading the latest snapshot of the Eclipse JDT Language Server...');
+		download_server_fn();
+	}
+	else {
+		build_server_fn();
+	}
 	done();
 });
 
@@ -244,3 +249,18 @@ function prependZero(num) {
 	}
 	return `${num < 10 ? "0" : ""}${num}`;
 }
+
+function download_server_fn(){
+	fse.removeSync('./server');
+	download(JDT_LS_SNAPSHOT_URL)
+		.pipe(decompress())
+		.pipe(gulp.dest('./server'));
+}
+
+function build_server_fn(){
+	fse.removeSync('./server');
+	cp.execSync(mvnw() + ' -Pserver-distro clean package -Declipse.jdt.ls.skipGradleChecksums', { cwd: server_dir, stdio: [0, 1, 2] });
+	gulp.src(server_dir + '/org.eclipse.jdt.ls.product/distro/*.tar.gz')
+		.pipe(decompress())
+		.pipe(gulp.dest('./server'));
+}

package.json

@@ -1431,6 +1431,7 @@
     "pretest": "npm run compile",
     "test": "node ./out/test/runtest.js",
     "build-server": "./node_modules/.bin/gulp build_server",
+    "build": "./node_modules/.bin/gulp build_or_download",
     "fast-build-server": "./node_modules/.bin/gulp dev_server",
     "watch-server": "./node_modules/.bin/gulp watch_server",
     "eslint": "eslint --ignore-path .eslintignore --ext .js,.ts,.tsx ."