The editor is jEdit.
(this is for 4.2 -- for v 4.3 see below)
1.Copy the r.xml into the modes directory under the jedit install in the Applications folder.
2. Open the file called catalog in the mode directory in a simple text editor and add the new edit mode here. Scroll down and add a line for R and comment out the line for rebol, like this:
<MODE NAME="R"; FILE="r.xml"
<!-- <MODE NAME="rebol" FILE="rebol.xml"
FILE_NAME_GLOB="*.r" /> -->
See the Installing Modes section of the jEdit user's guide for details.
3. Start jEdit. Go to Utilities>Global Options. Under Editing set Default edit mode to R.
Edit modes can also be changed by doubleclicking near the bottom right of the jedit window.
The colors and styles used to highlight syntax tokens can be changed in the Syntax Highlighting pane of the Utilities>Global Options dialog box; see the section called â€œThe Syntax Highlighting Paneâ€.
Note that different from "emacs speaks statistics" (on Mac) and Tin-R, jEdit cannot send commands directly to R to process. It is the old copy & paste.