On 24/03/2009 7:16 AM, Marie Sivertsen wrote:
Dear useRs,
I have a collection of source file and some of these call others. The files
are distribute among a number of directories, and to know how to call some
other file they need to know what file is currently executed.
As example, I have a file 'search.R' located in directory 'bin' which needs
to access the file 'terms.conf' located in the directory 'conf', a sibling
of 'bin'. I can have somethings like readLines('../conf/terms.conf') in
search.R, but this work only if search.R is executed from bin, when getwd is
'bin'. But when search.R calls from the parent as bin/search.R or any other
derectory then R complains that it could not find the file
'../conf/terms.conf'.
So my questions is: how can the file search.R, when executied, discover its
own location and load terms.conf from <location of
search.R>/../conf/terms.conf? the location of search.R can be unrelated to
the current directory.
In general it can't. Since source() can work on a connection and a
connection doesn't have to be a file, there may not be a location.
You could write your own Source function, something like this:
filenamestack <- c()
Source <- function(filename, ...) {
# push the new filename
filenamestack <<- c(filename, filenamestack)
# on exit pop it off the stack
on.exit(filenamestack <<- filenamestack[-1])
source(filename, ...)
}
and then examine filenamestack[1] to find the name of the file currently
being sourced. (But Source() won't work on connections, only on filenames.)
Duncan Murdoch
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