Programmatically add tags to yaml header during knitting R markdown file

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I'd like to programmatically add tags to the YAML header of a blogdown post when clicking the "knit" button.

For example something like this:

---
title: This is a post
author: brshallo
date: '2022-02-11'
tags: "`r stringr::str_c('\n  - ', stringr::str_flatten(c('rstats', 'datascience'), '\n  - '))`"
slug: this-is-a-post
---

Related Resources

I've tried a variety of solutions with !r, !expr, and iterations on these but so far no luck.

Here are some related threads:

I'd at first assumed this was a more general rmarkdown problem rather than blogdown specific but given that some of the solutions mentioned in threads above seemed to work when inputting generic params I wasn't sure...

blogdown r-markdown knitr r
1 Answers

To generate a valid YAML array, you could use the alternative syntax [ ], e.g.,

tags: ["`r paste(head(letters), collapse = '", "')`"]

which generates:

tags: ["a", "b", "c", "d", "e", "f"]

Note the hack collapse = '", "': since there already exists a pair of double quotes outside the R expression, you should only generate the part a", "b", "c", "d", "e", "f from the R expression.

-- solution copied from Yihui's explanation at blogdown#647

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