pandoc {knitr}

A Pandoc wrapper to convert documents to other formats

Description

This function calls Pandoc to convert documents to other formats such as HTML, LaTeX/PDF and Word, etc, (optionally) based on a configuration file or in-file configurations which specify the options to use for Pandoc.

Usage

pandoc(input, format, config = getOption("config.pandoc"), ext = NA)

Arguments

input

A character vector of Markdown filenames (must be encoded in UTF-8).

format

Name of the output format (see References). This can be a character vector of multiple formats; by default, it is obtained from the t field in the configuration. If the configuration is empty or the t field is not found, the default output format will be 'html'.

config

Path to the Pandoc configuration file. If missing, it is assumed to be a file with the same base name as the input file and an extension .pandoc (e.g. for ‘foo.md’ it looks for ‘foo.pandoc’)

ext

Filename extensions. By default, the extension is inferred from the format, e.g. latex creates pdf, dzslides creates html, and so on

Details

There are two ways to input the Pandoc configurations – through a config file, or embed the configurations in the input file as special comments between ⁠<!--pandoc⁠ and ⁠-->⁠.

The configuration file is a DCF file (see read.dcf). This file must contain a field named t which means the output format. The configurations are written in the form of tag:value and passed to Pandoc (if no value is needed, just leave it empty, e.g. the option standalone or s for short). If there are multiple output formats, write each format and relevant configurations in a block, and separate blocks with blank lines.

If there are multiple records of the t field in the configuration, the input markdown file will be converted to all these formats by default, unless the format argument is specified as one single format.

Value

The output filename(s) (or an error if the conversion failed).

References

Pandoc: https://pandoc.org; Examples and rules of the configurations: https://yihui.org/knitr/demo/pandoc/

Also see R Markdown (v2) at https://rmarkdown.rstudio.com. The rmarkdown package has several convenience functions and templates that make it very easy to use Pandoc. The RStudio IDE also has comprehensive support for it, so I'd recommend users who are not familiar with command-line tools to use the rmarkdown package instead.

See Also

read.dcf

Examples

system("pandoc -h")  # see possible output formats