Template rendering MVP

[GeorgeSG]

👋 Hi,

I saw your idea in the README to "Render Jinja2 template locally (like/via CLI?) in preview pane". I agree it'll be really useful :)

I didn't do exactly that (it's not local), but this PR implements an initial version of Template Rendering.

Overview

To render templates, I use Home Assistant's /api/template endpoint. I reused the existing infrastructure to get request/responses out of the server, and the rest was really easy to do.

The workflow is mostly the same as error logs:

• Registers the vscode-home-assistant.renderTemplate command. Adds it for command palette and editor/context menu. The command is available only when there is active text selection.
• renderTemplate gets the text selection from the active window and sends a clientRequest to the LanguageClient
• on request, LanguageClient constructs a request and sends it to HA
• on response and a render_template_completed notification, show a new Output CHannel - "Home Assistant Template Renderer"
• the Output Channel is cleared on each new request.

I had to add an optional body argument to HaConnection.callApi.

Preview

To do

There's probably a better way to present the input/output data than what I've done with the Output Channel.

I know you mentioned a preview pane, but I tried working with vscode's WebviewPanel and I don't think it was more convenient.

I think this should be good enough for an initial version and hopefully someone else can take it from here and improve the presentation :)

[stale]

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