1 introduction

I have been trying to find an Sweave →LATEX → HTML pathway that works via knitr …

I think I can get it to work now, although it’s not as pretty as I’d like. The bottom line is that to get this working you need to

• include render_listings() in an R chunk near the top of your file (I prefer the default highlighting on aesthetic grounds, but this works better with existing LATEX-to-HTML tools)
• add \usepackage{graphicx}; \DeclareGraphicsExtension{.pdf}; \usepackage{listings}; \lstset{language=R} to the preamble of your document, and make sure that the Sweavel.sty file is available.
• make sure you have myhtml.cfg file available (see the end of this document)
• run htlatex as follows:
  htlatex $*.tex myhtml "" "" "-interaction=nonstopmode"

  where (of course) $* is the basename of your document (this line is from a Makefile)

2 example

 
## normally also include=FALSE 
render_listings()
    

(An equation)

(1)

Some code:

 
## here’s a comment ... 
(x ← 5∧2)
    

 
[1] 25
    

 
y ← 17
    

A figure:

 
set.seed(101) 
plot(rnorm(10), rnorm(10))
    

Inline R expression: the value of x is 25.

Session info:

 
sessionInfo()
    

 
R Under development (unstable) (2012-07-27 r60013) 
Platform: i686-pc-linux-gnu (32-bit) 
 
locale: 
 [1] LC_CTYPE=en_CA.utf8       LC_NUMERIC=C 
 [3] LC_TIME=en_CA.utf8        LC_COLLATE=en_CA.utf8 
 [5] LC_MONETARY=en_CA.utf8    LC_MESSAGES=en_CA.utf8 
 [7] LC_PAPER=C                LC_NAME=C 
 [9] LC_ADDRESS=C              LC_TELEPHONE=C 
[11] LC_MEASUREMENT=en_CA.utf8 LC_IDENTIFICATION=C 
 
attached base packages: 
[1] stats     graphics  grDevices utils     datasets  base 
 
other attached packages: 
[1] knitr_0.8 
 
loaded via a namespace (and not attached): 
[1] digest_0.5.2   evaluate_0.4.2 formatR_0.6    plyr_1.7.1 
[5] stringr_0.6    tools_2.16.0
    

3 issues

• The assignment arrow <- inside the Sinput chunk confuses htlatex — have to run htlatex with interaction=nonstopmode (see below) — but the final document seems to come out OK. Is there a fix to Sweavel.sty, or something else, that will make it work?
• I don’t have pretty syntax highlighting working for htlatex yet.

4 references

• From Yihui Xie, about using render_listings() (and the fact that he prefers to start with a markdown document): https://groups.google.com/forum/#!msg/knitr/Dv2JmcDcuBo/dYkp2rEuSlAJ
• htlatex image processing: http://tex.stackexchange.com/questions/46156/pdf-image-files-and-htlatex
• htlatex formatting (I don’t have this working right yet): http://tex.stackexchange.com/questions/7216/how-to-get-tex4ht-to-respect-listings-styling-better
• more on htlatex/listings formatting (haven’t tried this yet): http://tex.stackexchange.com/questions/64054/latex-to-html-preserving-code-coloring-from-listings

5 latexml

latexml is an alternative conversion program that I haven’t managed to get working equally well …

 
system(”latexml --dest=’knitr_listings_test.xml’ knitr_listings_test.tex”) 
system(”latexmlpost --dest=’knitr_listings_test.xhtml’ knitr_listings_test.xml”)
    

6 myhtml.cfg