help output paged in separate window
Ted Harding wrote:
Hi folks, I use R in X windows on Linux. Normally, I use 'less' as pager, which is fine for scanning through 'help' (or '?') output in the R window itself; the help session is terminated by typing "q", as usual for 'less', and the R window then reverts to the R command line interface. Often, I would like to have the output from 'help' pop up in a separate window so that I can continue to work in the R window while reading the help. The "help" window could then be closed when interest in this particular help dwindles. What can I set $PAGER to, to achieve this? Or should it be done in a different way (e.g. using some option to 'help' or to 'file.show')? (I don't want to use 'help.start' because of the overhead of using an HTML browser)
Well, here is a little function derived from the help browser macro I
wrote for NEdit that will fire up an xterm with less displaying the help
for a function. I haven't accounted for operators, but it could be done,
and I haven't extensively tested it, but I suppose I shouldn't expect to
have all the fun...
Jim
helpless<-function(topic) {
topic<-substitute(topic)
sys.command<-paste("locate ",topic,sep="",collapse="")
helpfilelist<-system(sys.command,TRUE)
helpmatch<-paste("help/",topic,sep="",collapse="")
# find the R text help file(s)
helpfile<-helpfilelist[grep(helpmatch,helpfilelist)]
# assume that the shortest name matching "topic" will be the one
if(length(helpfile) > 1)
helpfile<-helpfile[which.min(nchar(helpfile))]
sys.command<-paste("xterm -e less ",helpfile,sep="",collapse="")
system(sys.command)
}