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#' This R script will process all R mardown files (those with in_ext file extention,
#' .rmd by default) in the current working directory. Files with a status of
#' 'processed' will be converted to markdown (with out_ext file extention, '.markdown'
#' by default). It will change the published parameter to 'true' and change the
#' status parameter to 'publish'.
#'
#' @param path_site path to the local root storing the site files
#' @param dir_rmd directory containing R Markdown files (inputs)
#' @param dir_md directory containing markdown files (outputs)
#' @param url_images where to store/get images created from plots directory +"/" (relative to path_site)
#' @param out_ext the file extention to use for processed files.
#' @param in_ext the file extention of input files to process.
#' @param recursive should rmd files in subdirectories be processed.
#' @return nothing.
#' @author Jason Bryer <jason@bryer.org> edited by Andy South
rmd2md <- function( path_site = getwd(),
dir_rmd = "_rmd",
dir_md = "_posts",
#dir_images = "figures",
url_images = "figures/",
out_ext='.md',
in_ext='.rmd',
recursive=FALSE) {
require(knitr, quietly=TRUE, warn.conflicts=FALSE)
#andy change to avoid path problems when running without sh on windows
files <- list.files(path=file.path(path_site,dir_rmd), pattern=in_ext, ignore.case=TRUE, recursive=recursive)
for(f in files) {
message(paste("Processing ", f, sep=''))
content <- readLines(file.path(path_site,dir_rmd,f))
frontMatter <- which(substr(content, 1, 3) == '---')
if(length(frontMatter) >= 2 & 1 %in% frontMatter) {
statusLine <- which(substr(content, 1, 7) == 'status:')
publishedLine <- which(substr(content, 1, 10) == 'published:')
if(statusLine > frontMatter[1] & statusLine < frontMatter[2]) {
status <- unlist(strsplit(content[statusLine], ':'))[2]
status <- sub('[[:space:]]+$', '', status)
status <- sub('^[[:space:]]+', '', status)
if(tolower(status) == 'process') {
#This is a bit of a hack but if a line has zero length (i.e. a
#black line), it will be removed in the resulting markdown file.
#This will ensure that all line returns are retained.
content[nchar(content) == 0] <- ' '
message(paste('Processing ', f, sep=''))
content[statusLine] <- 'status: publish'
content[publishedLine] <- 'published: true'
#andy change to path
outFile <- file.path(path_site, dir_md, paste0(substr(f, 1, (nchar(f)-(nchar(in_ext)))), out_ext))
#render_markdown(strict=TRUE)
#render_markdown(strict=FALSE) #code didn't render properly on blog
#andy change to render for jekyll
render_jekyll(highlight = "pygments")
#render_jekyll(highlight = "prettify") #for javascript
opts_knit$set(out.format='markdown')
# andy BEWARE don't set base.dir!! it caused me problems
# "base.dir is never used when composing the URL of the figures; it is
# only used to save the figures to a different directory.
# The URL of an image is always base.url + fig.path"
# https://groups.google.com/forum/#!topic/knitr/18aXpOmsumQ
opts_knit$set(base.url = "/")
opts_chunk$set(fig.path = url_images)
#andy I could try to make figures bigger
#but that might make not work so well on mobile
#opts_chunk$set(fig.width = 8.5,
# fig.height = 5.25)
try(knit(text=content, output=outFile), silent=FALSE)
} else {
warning(paste("Not processing ", f, ", status is '", status,
"'. Set status to 'process' to convert.", sep=''))
}
} else {
warning("Status not found in front matter.")
}
} else {
warning("No front matter found. Will not process this file.")
}
}
invisible()
}