Tag Archives: wordpress plugin

WP-CodeBox: A better R syntax highlighter plugin for WordPress

Today I was informed of (what I believe is) a better the best WordPress plugin for R syntax highlighting called WP-CodeBox.  This plugin doesn’t require any hacks to make it work (as opposed to the WP-Syntax plugin, which I wrote about in the past).  WP-CodeBox can be downloaded and installed on a WordPress by searching for it in the “Add New” section in the plugins menu.

WP-CodeBox provides some nice features (some AJAX based) to the display of the code in the post:

  1. The code box in the post can now be folded (top right of the code box) so the code can be hidden so to not clutter the post (if the code is too long)
  2. The code box is added with another button  (top left of the code box) which allows the reader to see the code in a new window – so to easily enable a copy paste of the code.
  3. The options of the plugin allows automatic row numbering of the code, control over “tab” length and some other features.

p.s: Lastly, my thanks goes to guangchuang yu who’s comment on my original post, and he’s post on wp-codebox and R, has introduced me to this better plugin.

p.p.s: in case you blog on WordPress.com, there is also a solution for R syntax highlighting for WordPress.com bloggers.

R syntax highlighting for bloggers on WordPress.com

Good news for R bloggers who are using WordPress.com to host their blog.

This week, the good people running WordPress.com (special thanks goes to Yoav Farhi), have added the ability for all the users of the WordPress.com platform to be able to highlight their R code inside posts.

Basically you’ll need to wrap the code in your post like this:

[sourcecode language="r"]
test.function = function(r) {
    return(pi * r^2)
}
test.function(1)
[/sourcecode]

(Which will then look like this:
r syntax highlighted code example
)

Further details (and other supported languages) can be read about on this WordPress.com support page.

This new feature was possible thanks to the work of Yihui Xie (who create the famous cool animation package for R), who created a R syntax brush for the syntaxhighlighter WordPress plugin (the plugin used by WordPress.com for sytnax highlighting) . And thanks should also go to Andrew Redd, the creator of NppToR (which connects between notepad++ to R). He both made some good suggestions, and was game to take on the brush creation in case there would be problems, which thankfully so far there aren’t any)

p.s: If you are a WordPress.org users (e.g: have a self hosted WordPress blog) and want to enable R syntax highlighting for your blog, I would recommend the use of the WP-Syntax plugin (enhanced with GeSHi version 1.0.8.6) which can be downloaded here.

Highlight the R syntax on your (WordPress) blog using the wp-syntax plugin

Update (11.10.10): I found a better solution for R syntax highlighting then the one presented in this post. The plugin is called WP-CodeBox, and I wrote about it on the post – WP-CodeBox: A better R syntax highlighter plugin for WordPress
Download link for WP-Syntax plugin (with GeSHi version 1.0.8.6)

In case you have a self hosted WordPress blog, and you wish to show your R code in it, how would you do it?

The simplest solution would be to just paste the code as plain text, which will look like this:

x <- rnorm(100, mean = 2, sd = 3)
plot(x, xlab = “index”, main = “Example code”)

But if you would like to help our readers orient themselves inside your code by giving different colors to different commands in the code (a.k.a: syntax highlighting). So it would like something like this:

1
2
x <- rnorm(100, mean = 2, sd = 3) # Creating a vector
plot(x, xlab = "index", main = "Example code") # Plotting it

How then would you do it?

Plugin Installation

The easiest way to do this inside a self hosted WordPress blog is by installing a plugin called WP-Syntax:

WP-Syntax provides clean syntax highlighting using GeSHi — supporting a wide range of popular languages (including R). It supports highlighting with or without line numbers and maintains formatting while copying snippets of code from the browser.

But there is a problem. The current WP-Syntax version is using an old version of GeSHi, and only the newer version (currently GeSHi version 1.0.8.6) includes support for R syntax. In order to solve this I patched the plugin and I encourage you to download (the fixed version of) WP-Syntax from here, which will allow you to highlight your R code.

Usage

After installing (and activating) the plugin, in order to add R code to your post you will need to:
1) Only work in HTML mode (not the Visual mode). Or else, the code you will paste will be messed up.
2) Put your code between the <pre> tag, like this:

(Note: make sure that you rewrite the ” – so it will work.)

<pre lang=”rsplus” line=”1″>
…Your R code here…
</pre>

Final note: R Syntax highlight in other ways

If you wish to have R syntax higlight inside an HTML file, I encourage you can have a look at the highlight package, by Romain Francois.

If you want to higlight your R syntax inside wordpress.com, here is a blog post by Erik Iverson showing how to do that using Emacs.

p.s: If you have a blog in which you write about R, please let me know about it in the comments (Or just join R-bloggers.com) – I’d love to follow you :-)

Update: Stephen Turner wrote about a syntax highlighting solution for R and blogger using github gist. And also mentioned there another solution for self hosted wordpress blogs, via J.D. Long: a Github Gist plugin for WordPress. Go publish code :)