knitr (version 1.48)

is_latex_output: Check the current input and output type

Description

The function is_latex_output() returns TRUE when the output format is LaTeX; it works for both .Rnw and R Markdown documents (for the latter, the two Pandoc formats latex and beamer are considered LaTeX output). The function is_html_output() only works for R Markdown documents and will test for several Pandoc HTML based output formats (by default, these formats are considered as HTML formats: c('markdown', 'epub', 'epub2', 'html', 'html4', 'html5', 'revealjs', 's5', 'slideous', 'slidy', 'gfm')).

Usage

is_latex_output()
is_html_output(fmt = pandoc_to(), excludes = NULL)
pandoc_to(fmt, exact = FALSE)
pandoc_from(exact = FALSE)

Arguments

fmt

A character vector of output formats to be checked against. If not provided, is_html_output() uses pandoc_to(), and pandoc_to() returns the output format name.

excludes

A character vector of output formats that should not be considered as HTML format. Options are: markdown, epub, epub2, html, html4, html5, revealjs, s5, slideous, slidy, and gfm.

exact

Whether to return or use the exact format name. If not, Pandoc extensions will be removed from the format name, e.g., latex-smart will be treated as latex.

Details

The function pandoc_to() returns the Pandoc output format, and pandoc_from() returns Pandoc input format. pandoc_to(fmt) allows to check the current output format against a set of format names. Both are to be used with R Markdown documents.

These functions may be useful for conditional output that depends on the output format. For example, you may write out a LaTeX table in an R Markdown document when the output format is LaTeX, and an HTML or Markdown table when the output format is HTML. Use pandoc_to(fmt) to test a more specific Pandoc format.

Internally, the Pandoc output format of the current R Markdown document is stored in knitr::opts_knit$get('rmarkdown.pandoc.to'), and the Pandoc input format in knitr::opts_knit$get('rmarkdown.pandoc.from')

Examples

# check for output formats type
knitr::is_latex_output()
knitr::is_html_output()
knitr::is_html_output(excludes = c("markdown", "epub"))
# Get current formats
knitr::pandoc_from()
knitr::pandoc_to()
# Test if current output format is 'docx'
knitr::pandoc_to("docx")