customizing r quarto pdf output file name-CodePudding

How do I customize the filename of r quarto pdf document when I render? Before when I was using Rmarkdown I was using the following code in the YAML:

---
title: "Some title"
author: "First Last"
date: "`r format(Sys.Date(), '%d %B, %Y')`"
output: pdf_document
knit: (function(inputFile, encoding) { rmarkdown::render(inputFile, encoding = encoding, output_file = file.path(dirname(inputFile), paste0(Sys.Date(),"_Report","_FirstLast",".pdf"))) })
---

When I hit the "Knit" button the filename of the pdf document would be 2022-08-08_Report_FirstLast.pdf

Is there a way to do this with quarto pdf? I think the quarto_render function needs to be used but don't know how.

CodePudding user response：

Use the output_file argument of quarto_render function.

file_name = paste0(Sys.Date(),"_Report","_FirstLast", ".pdf")

quarto_render("your_qmd_file.qmd", output_file = file_name, output_format = "pdf")

Now about the approach you are trying,

Firstly, there's no such knit yaml key in quarto AFAIK
Secondly, although r-code can be used in code-chunk option prefixed be !expr , it's not possible to use inline R code in document yaml section right at this moment of answering this question (03 Sep, 2022). See this discussion on Github.

Though there are some suggested workaround for using r-code in yaml in this discussion on Github, but using quarto_render to control output filename seems the easiest option in your case.

And additionally, if your output file name is simple (that is, without any r-code syntax), you can use output-file yaml option.

---
title: "Testing Output file name"
format:
   pdf: 
    output-file: "output_file_name"
    output-ext:  "pdf"
---


## Quarto

Quarto enables you to weave together content 
and executable code into a finished document.
To learn more about Quarto 
see <https://quarto.org>.

## Running Code

When you click the **Render** button 
a document will be generated that 
includes both content and the output of 
embedded code.

This will create the output file named output_file_name.pdf in the directory where the source file is.

CodePudding user response：

If you're comfortable using Quarto CLI in bash shell (which may be more convenient for automatic report generation), you could date-stamp your outputs like this.

now=`date  "%Y-%m-%d"`
quarto render my_doc.qmd --output "./out_$now.pdf" --to pdf