When it comes to R blogging I’m a complete newbie. So I’m still struggling with the technical details.

Part of the process is prettifying the code snippets. One of the standard ways of doing this involves copy-and-paste-ing the R code into the Pretty R syntax highlighter.

While assembling the bits to do the posting programmatically I wrote a function that replaces the copy-and-paste part.

Now here’s the function prettified by itself:

prettyR <- function(file) {

require(RCurl)

require(XML)

Rcode <- readLines(file)

Rcode <- paste(Rcode, collapse="\n")

# assemble the parameters for the http POST to the Pretty R web site

URL <- "http://www.inside-r.org/pretty-r/tool"

parameters <- list(

op = "edit-submit",

form_id = "pretty_r_tool_form",

code_input = Rcode

)

# send the http POST request

rawHTML <- postForm(URL, .params = parameters)

parsedHTML <- htmlParse(rawHTML)

# find the node

prettified <- getNodeSet(parsedHTML, "//div[@class='form-item']/textarea")[[1]]

prettified <- xmlValue(prettified[[1]])

return(prettified)

}

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