Parse a named list to yaml header for an Rmd file — as_yaml

Converts a named list into a yaml header for Rmd, handling output types and arguments as defined in the rmarkdown package. This function simplifies the process of generating yaml headers.

Usage

as_yaml_auto(
  input_list,
  as_header = TRUE,
  convert_logi = TRUE,
  multi_output = FALSE,
  silent = FALSE
)

Arguments

input_list: (named list) non nested with slots names and their values compatible with Rmd yaml header.
as_header: (logical(1)) optionally wrap with result with the internal md_header(), default TRUE.
convert_logi: (logical(1)) convert a character values to logical, if they are recognized as quoted yaml logical values , default TRUE.
multi_output: (logical(1)) multi output slots in the input argument, default FALSE.
silent: (logical(1)) suppress messages and warnings, default FALSE.

Value

character with rmd_yaml_header class, result of yaml::as.yaml, optionally wrapped with internal md_header().

Details

This function processes a non-nested (flat) named list into a yaml header for an Rmd document. It supports all standard Rmd yaml header fields, including author, date, title, subtitle, abstract, keywords, subject, description, category, and lang. Additionally, it handles output field types and arguments as defined in the rmarkdown package.

Note

Only non-nested lists are automatically parsed. Nested lists require direct processing with yaml::as.yaml.

Examples

# nested so using yaml::as.yaml directly
as_yaml_auto(
  list(author = "", output = list(pdf_document = list(toc = TRUE)))
)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#> ---

# auto parsing for a flat list, like shiny input
input <- list(author = "", output = "pdf_document", toc = TRUE, keep_tex = TRUE)
as_yaml_auto(input)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---

as_yaml_auto(list(author = "", output = "pdf_document", toc = TRUE, keep_tex = "TRUE"))
#> The 'TRUE' value should be a logical, so it is automatically converted.
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---

as_yaml_auto(list(
  author = "", output = "pdf_document", toc = TRUE, keep_tex = TRUE,
  wrong = 2
))
#> Warning: Not recognized and skipped arguments: wrong
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---

as_yaml_auto(list(author = "", output = "pdf_document", toc = TRUE, keep_tex = 2),
  silent = TRUE
)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: 2.0
#> ---

input <- list(author = "", output = "pdf_document", toc = TRUE, keep_tex = "True")
as_yaml_auto(input)
#> The 'True' value should be a logical, so it is automatically converted.
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---
as_yaml_auto(input, convert_logi = TRUE, silent = TRUE)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---
as_yaml_auto(input, silent = TRUE)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#> ---
as_yaml_auto(input, convert_logi = FALSE, silent = TRUE)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: 'True'
#> ---

as_yaml_auto(
  list(
    author = "", output = "pdf_document",
    output = "html_document", toc = TRUE, keep_tex = TRUE
  ),
  multi_output = TRUE
)
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#>   html_document:
#>     toc: yes
#> ---
as_yaml_auto(
  list(
    author = "", output = "pdf_document",
    output = "html_document", toc = "True", keep_tex = TRUE
  ),
  multi_output = TRUE
)
#> The 'True' value should be a logical, so it is automatically converted.
#> ---
#> author: ''
#> output:
#>   pdf_document:
#>     toc: yes
#>     keep_tex: yes
#>   html_document:
#>     toc: yes
#> ---