inst/examples/render.r

In littler: R at the Command-Line via 'r'

#!/usr/bin/env r
#
# Another example to convert markdown
#
# Copyright (C) 2016 - 2019  Dirk Eddelbuettel
#
# Released under GPL (>= 2)

## load docopt package from CRAN
library(docopt)

## configuration for docopt
doc <- "Usage: render.r [-c] [-h] [-x] [FILES...]

-c --compact         compact pdf file [default: FALSE]
-h --help            show this help text
-x --usage           show help and short example usage"

opt <- docopt(doc)			# docopt parsing

if (opt$usage) {
    cat(doc, "\n\n")
    cat("Examples:
  render.r foo.Rmd bar.Rmd        # convert two given files

render.r is part of littler which brings 'r' to the command-line.
See http://dirk.eddelbuettel.com/code/littler.html for more information.\n")
    q("no")
}

library(rmarkdown)

## helper function
renderArg <- function(p) {
    if (!file.exists(p)) stop("No file '", p, "' found. Aborting.", call.=FALSE)
    render(p)
    if (opt$compact) {
        s <- gsub(".Rmd$", ".pdf", p)
        if (file.exists(s)) tools::compactPDF(s, gs_quality="ebook")
    }
}

## render files using helper function
sapply(opt$FILES, renderArg)