Add Theia Plugin APIs to support VS Code XML Tooling

[apupier]

Description

Che is not providing XML support currently; it would be nice to reuse the VS Code xml work https://marketplace.visualstudio.com/items?itemName=redhat.vscode-xml

Reproduction Steps

currently it is failing with:

root ERROR [hosted-plugin: 211] (node:211) UnhandledPromiseRejectionWarning: SyntaxError: Unexpected token u in JSON at position 0
    at JSON.parse (<anonymous>)
    at getSettings (/tmp/vscode-unpacked/vscode_extension_redhat_vscode_xml.vsix/extension/out/src/extension.js:74:29)
    at requirements.resolveRequirements.catch.then.requirements (/tmp/vscode-unpacked/vscode_extension_redhat_vscode_xml.vsix/extension/out/src/extension.js:45:48)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:189:7)

the corresponding code is:

function getSettings() {
        let configXML = vscode_1.workspace.getConfiguration();
        configXML = configXML.get('xml');
        let x = JSON.stringify(configXML);
        let settings = JSON.parse(x);
        settings['logs']['file'] = logfile;
        return settings;
    }

Line 74 is the JSON.parse

OS and version:

Diagnostics:

[apupier]

current stack seems to be a Theia issue so reported eclipse-theia/theia#3317

[skabashnyuk]

@ashumilova @evidolob can you help here?

[slemeur]

@evidolob + @tsmaeder : Could you check the status of this issue regarding the progress on eclipse-theia/theia#2341 ?

[tsmaeder]

@slemeur testing the xml plugin (and identifying missing/broken API is on our plan), however, there are two things you might not be aware of:

1. Plugins use VSCode API beyond the "languages" namespace
2. The "renameProvider" API is still missing. As far as I understand, the IDE2 team is tasked with completing [plug-in] Languages API eclipse-theia/theia#2341

[tsmaeder]

Update: there seems to be a PR pending for the rename provider.

[benoitf]

rename provider eclipse-theia/theia#4025 has been merged upstream

[apupier]

@benoitf @tsmaeder if I understand well, this has been done, right?
If yes, I will close the issue

[tsmaeder]

Well, we added a lot of API, did you recently try to run the camel extension in Theia again?

[apupier]

no, I haven't recently try to run the Camel Extension but this issue is about XML in general.

[apupier]

this issue is about pure XML.
As the item to have xml support in Che is closed, it means that it has been done for Theia: #12437