gfm-table.md

Here is how you can make a table in GFM format using knitr + ascii

render_gfm()
gfm_table <- function(x, ...) {
    require(ascii)
    y <- capture.output(print(ascii(x, ...), type = "org"))
    # substitute + with | for table markup
    # TODO: modify regex so that only + signs in markup,
    #   like -+- are substituted
    y <- gsub("[+]", "|", y)
    return(writeLines(y))
}

x <- head(mtcars[, 1:3])
gfm_table(x)

	mpg	cyl	disp
Mazda RX4	21.00	6.00	160.00
Mazda RX4 Wag	21.00	6.00	160.00
Datsun 710	22.80	4.00	108.00
Hornet 4 Drive	21.40	6.00	258.00
Hornet Sportabout	18.70	8.00	360.00
Valiant	18.10	6.00	225.00

gfm-table_knit_.md

Here is how you can make a table in GFM format using knitr + ascii

<!-- begin.rcode 
render_gfm()
gfm_table <- function(x, ...){
  require(ascii)
  y <- capture.output(print(ascii(x, ...), type = 'org'))
  # substitute + with | for table markup
  # TODO: modify regex so that only + signs in markup, like -+- are substituted
  y <- gsub('[+]', '|', y)
  return(writeLines(y))
}
end.rcode -->

<!-- begin.rcode results = 'asis'
x <- head(mtcars[,1:3])
gfm_table(x)
end.rcode -->