Instrumentation: emit event with view file

[olivier-thatch]

Feature request

When instrumentation is enabled, ViewComponent will emit render.view_component events. The payload for these events looks like:

{
  name: "MyComponent",
  identifier: "/Users/mona/project/app/components/my_component.rb"
}

It would be nice if ViewComponent was also able to emit events when rendering a specific view file (app/components/my_component.html.erb), and include the view file in the payload, similar to ActionView's own render_{template,layout,partial}.action_view events.

Motivation

These events would enable Coverband to detect when a specific view is used. More information in this thread: danmayer/coverband#591

[Spone]

Hi @olivier-thatch, this sounds like a welcome addition, would you like to open a PR for this?

[olivier-thatch]

I did take a brief look at the source before opening this PR, but the rendering code is fairly complex so any pointers would be appreciated :)