Hello,
WRE contains the following information about the "exec" subdirectory of
a package :
"Subdirectory exec could contain additional executables the package
needs, typically scripts for interpreters such as the shell, Perl, or
Tcl. This mechanism is currently used only by a very few packages, and
still experimental."
I think it would be useful to expand "very few". For example "tcltk"
uses it.
But the real questions are;
- can this be used in conjunction with "R CMD", something like
$ R CMD execute package script parameters
The alternative used in a few packages (Rserve, Roxygen, ...) is to add
a file in ${R_HOME}/bin, but I am not sure this works with binary builds
of packages
- can the script be an R script, in that case would a shebang like this
be enough :
#!/bin/env Rscript
definitely works on (at least my) linux
A very naive "execute" written in R follows.
Romain
#!/bin/env Rscript
args <- commandArgs(TRUE)
if( length(args) < 2 ){
stop( "usage : R CMD execute package script [parameters]\n" )
}
package <- args[1]
script <- args[2]
scriptfile <- file.path( system.file( "exec", script, package = package ) )
if( !file.exists( scriptfile ) ){
stop( sprintf( "file not found: '%s' ", scriptfile ) )
}
trail <- if( length(args) > 2 ) paste( tail( args, -2 ), sep = " " ) else ""
cmd <- sprintf( '"%s" %s', scriptfile, trail )
system( cmd )
--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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