Add date to rmarkdown file output name when clicking "knit"

[jarbet]

Describe the bug
I am using rmarkdown within VSCode, and would like to automatically add today's date to the output filename when clicking the 'knit' button. I see that this feature was requested here and added in PR #765, however, I can't get it to work.

To Reproduce
Steps to reproduce the behavior:

1. Create file test.Rmd that contains the following code:

---
title: "hello world"
knit: (function(input, ...) {
    rmarkdown::render(
      input,
      output_file = paste0(
        xfun::sans_ext(input), '-', Sys.Date(), '.html'
      ),
      envir = globalenv()
    )
  })
---

hello world

2. Click on Knit > Rmd button:
   

3. Unfortunately, the output filename is test.html and does not contain the date:
   

Note after clicking the knit button, the following command is automatically called (which I suspect is causing the date to be removed from the filename):

rmarkdown::render("test.Rmd", encoding = "UTF-8")

Environment (please complete the following information):

• OS: macOS but I am using VSCode to connect to a remote server where I am using Rmarkdown/R for analysis
• VSCode Version: 1.69.1
• R Version: 4.1.3
• vscode-R version: v\2.5.2

[ElianHugh]

I can't replicate this locally -- I'd just like to double check that you have enabled the VSC setting rmarkdown.knit.useBackgroundProcess as otherwise vscode-R will default to standard knitting in the interactive terminal

[jarbet]

I can't replicate this locally -- I'd just like to double check that you have enabled the VSC setting rmarkdown.knit.useBackgroundProcess as otherwise vscode-R will default to standard knitting in the interactive terminal

It works now after checking that box. Thanks!