These functions set built-in output hooks for LaTeX, HTML, Markdown, reStructuredText, AsciiDoc and Textile.
render_html()render_asciidoc()
render_latex()
render_sweave()
render_listings()
render_markdown(strict = FALSE, fence_char = "`")
render_jekyll(highlight = c("pygments", "prettify", "none"), extra = "")
render_rst(strict = FALSE)
render_textile()
Boolean; whether to use strict markdown or reST syntax. For markdown, if
TRUE, code blocks will be indented by 4 spaces, otherwise they are
put in fences made by three backticks. For reST, if TRUE, code is
put under two colons and indented by 4 spaces, otherwise it is put under the
sourcecode directive (this is useful for e.g. Sphinx).
A single character to be used in the code blocks fence. This can be e.g. a backtick or a tilde, depending on your Markdown rendering engine.
Which code highlighting engine to use: if pygments,
the Liquid syntax is used (default approach Jekyll); if prettify,
the output is prepared for the JavaScript library prettify.js; if
none, no highlighting engine will be used, and code blocks are simply
indented by 4 spaces).
Extra tags for the highlighting engine. For pygments, this
can be 'linenos'; for prettify, it can be 'linenums'.
NULL; corresponding hooks are set as a side effect
There are three variants of markdown documents: ordinary markdown
(render_markdown(strict = TRUE)), extended markdown (e.g. GitHub
Flavored Markdown and pandoc; render_markdown(strict = FALSE)), and
Jekyll (a blogging system on GitHub; render_jekyll()). For LaTeX
output, there are three variants as well: knitr's default style
(render_latex(); use the LaTeX framed package), Sweave style
(render_sweave(); use Sweave.sty) and listings style
(render_listings(); use LaTeX listings package). Default HTML
output hooks are set by render_html(); render_rst() and
render_asciidoc() are for reStructuredText and AsciiDoc respectively.
These functions can be used before knit() or in the first chunk of the
input document (ideally this chunk has options include = FALSE and
cache = FALSE) so that all the following chunks will be formatted as
expected.
You can use knit_hooks to further customize output hooks; see
references.
See output hooks in https://yihui.org/knitr/hooks/.
Jekyll and Liquid: https://github.com/jekyll/jekyll/wiki/Liquid-Extensions; prettify.js: http://code.google.com/p/google-code-prettify/