Polish 'Create Visual Studio Code extension'

Refine extension to use stdin/stdout to communicate with the Java
code rather than using an HTTP endpoint.

This commit also restructures the way that the extension is built
and reduces the number of Maven projects. It also drops Markdown
formatting support.

See gh-142

Author: philwebb

Diff for: CONTRIBUTING.adoc

@@ -167,20 +167,35 @@ To add gradle classes, convert this module to a gradle project.
 
 
 
+=== Setting up Visual Studio Code Extension Development
+The `spring-javaformat-vscode-extension` extension consists of a formatter written in Java and an extension written in TypeScript.
+If you want to work on the TypeScript code it can opened directly with Visual Studio Code.
+
+Maven delegates to `npm run package` to actually generate the extension.
+
+Code is formatted with prettier.
+If you need to reform the code you can run `npx prettier --write .`
+
+There is a basic test included with the project, but since it needs UI elements it doesn't run as part of the regular build.
+If you make changes to the extension, you should run "`Extension Tests`" from vscode.
+
+
+
 === Importing Into Other IDEs
 Maven is well supported by most Java IDEs. Refer to your vendor documentation.
 
 
 
 == Understanding the Code
 There are quite a few moving parts to this project and the build is quite complex.
-At the top level there are 5 projects:
+At the top level there are 6 projects:
 
 * `spring-javaformat` - The main formatter project
 * `spring-javaformat-eclipse` - The Eclipse plugin
 * `spring-javaformat-gradle` - The Gradle plugin
 * `spring-javaformat-intellij` - The IntelliJ IDEA plugin
 * `spring-javaformat-maven` - The Maven plugin
+* `spring-javaformat-vscode` - The Visual Studo Code extension
 
 Under `spring-javaformat` the following projects are defined:
 

Diff for: README.adoc

@@ -269,8 +269,12 @@ Once the configuration file is created, configure your IDE to use it:
 
 
 === Visual Studio Code
-The vscode extension provides custom formatter support for Visual Studio Code.
-The extension is automatically activated whenever a `.java` file is opened. And it requires a few seconds to warm-up while you start with the first workspace.
+The Visual Studio Code extension provides custom formatter support for Microsoft Visual Studio Code.
+The extension using the [`DocumentFormattingEditProvider`](https://code.visualstudio.com/api/references/vscode-api#DocumentFormattingEditProvider) API.
+Once installed it may be activated by using the "`Format Document`" action available in the editor context menu or from the Command Palette.
+
+To install the extension select "`Install from VSIX`" in the extensions panel and choose the `spring-javaformat-vscode-extension` vsix file.
+You can download the latest version from https://repo1.maven.org/maven2/io/spring/javaformat/spring-javaformat-vscode-extension/{release-version}[Maven Central].
 
 
 

Diff for: pom.xml

@@ -59,6 +59,11 @@
 	<build>
 		<pluginManagement>
 			<plugins>
+				<plugin>
+					<groupId>com.github.eirslett</groupId>
+					<artifactId>frontend-maven-plugin</artifactId>
+					<version>1.12.1</version>
+				</plugin>
 				<plugin>
 					<groupId>com.github.wvengen</groupId>
 					<artifactId>proguard-maven-plugin</artifactId>
@@ -362,6 +367,25 @@
 										<ignore />
 									</action>
 								</pluginExecution>
+								<pluginExecution>
+									<pluginExecutionFilter>
+										<groupId>
+											com.github.eirslett
+										</groupId>
+										<artifactId>
+											frontend-maven-plugin
+										</artifactId>
+										<versionRange>
+											[1.12.1,)
+										</versionRange>
+										<goals>
+											<goal>npx</goal>
+										</goals>
+									</pluginExecutionFilter>
+									<action>
+										<ignore></ignore>
+									</action>
+								</pluginExecution>
 							</pluginExecutions>
 						</lifecycleMappingMetadata>
 					</configuration>
@@ -597,10 +621,11 @@
 	</dependencies>
 	<modules>
 		<module>spring-javaformat</module>
-		<module>spring-javaformat-maven</module>
-		<module>spring-javaformat-gradle</module>
 		<module>spring-javaformat-eclipse</module>
+		<module>spring-javaformat-gradle</module>
 		<module>spring-javaformat-intellij-idea</module>
+		<module>spring-javaformat-maven</module>
+		<module>spring-javaformat-vscode</module>
 	</modules>
 	<profiles>
 		<profile>

Diff for: spring-javaformat-maven/spring-javaformat-maven-plugin/pom.xml

@@ -15,6 +15,16 @@
 	</properties>
 	<build>
 		<plugins>
+			<plugin>
+				<artifactId>maven-clean-plugin</artifactId>
+				<configuration>
+					<filesets>
+						<fileset>
+							<directory>out</directory>
+						</fileset>
+					</filesets>
+				</configuration>
+			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-invoker-plugin</artifactId>

Diff for: spring-javaformat-vscode/pom.xml

@@ -15,6 +15,6 @@
 		<main.basedir>${basedir}/..</main.basedir>
 	</properties>
 	<modules>
-		<module>spring-javaformat-format-service</module>
+		<module>spring-javaformat-vscode-extension</module>
 	</modules>
 </project>