Add LemMinx extensions via vscode user settings

[angelozerr]

LemMinx is extensible to manage custom completion, validation, etc. https://github.com/eclipse/lemminx-maven is a good sample of extension which provides support for maven.

To use this extension, it requires to create a vscode extension (eg: https://github.com/angelozerr/vscode-xml-maven)

This issue is to provide a new xml settings like xml.extension.jars which is an array of String which defines paths from LemMinx JAR extensions. to use when classpath is created

[AObuchow]

+1, this is the VSCode equivalent of the lemminxExtension in Wild Web Developer (although simpler for non-VSCode developers to use).

[AObuchow]

@angelozerr how hard do you think it would be for someone who has never wrote (but has read a lot of) TypeScript :) Maybe I should try to fix this bug in my spare time.

[angelozerr]

I think it's not a big deal. The idea is to

1. add a new method which read configuration :

let classPathFromSettings = workspace.getConfiguration("xml.server").get("extensions");

like

vscode-xml/src/settings.ts

Line 87 in e01d3e0

let currentVMArgs = workspace.getConfiguration("xml.server").get("vmargs");

2. call this method in

vscode-xml/src/javaServerStarter.ts

Line 66 in e01d3e0

let xmlJavaExtensionsClasspath = '';

3. declare the settings in package.json like

   vscode-xml/package.json

   Line 270 in e01d3e0

   "xml.server.workDir": {

@fbricon for the settings name I suggest xml.server.extensions which is an array of JAR, what do you think about that ?

[angelozerr]

@AObuchow is there any chance that you work on this issue? I think it could be a nice feature to test quickly the LemMinx maven support inside vscode.

[AObuchow]

Wow I was just thinking about this yesterday night, good timing @angelozerr ;)

I’ll see with my team how much of a priority this is. It might be that I’ll work on it in my spare time. I’m about to release my first Eclipse plugin on the marketplace (probably tomorrow) but after that I want to get this done :)