The new version of csaw introduced the very helpful dumpPE function to improve efficiency of downstream methods. 

However, is one expected to use this method one file at a time or can multiple files be supplied. 

For example, csaw suggests this:

outBam <- dumpPE(bamFile, "whee", param=xparam, overwrite=TRUE)
out2 <- windowCounts(outBam, param=reform(xparam, fast.pe=TRUE), filter=1)

However, I want to do something like this 

outBams <- dumpPE(bamFiles, prefix=list_of_prefixes, param=xparam, overwrite=TRUE)
out2 <- windowCounts(outBams, param=reform(xparam, fast.pe=TRUE), filter=1)

Is this a possibility ? 

Currently the specs say that bam.file should be of type character(1). 

Any help would be appreciated. 

Thanks ! 

Currently, one file needs to be supplied at a time, as part of a for or lapply loop. I had thought about adding support for multiple files, but that task just crossed my maximum effort-to-reward threshold, mostly because dumpPE tends to be a function you call once for a given study. After all, you don't have to dump the files for every windowCounts call, you do it once and re-use the files across the analysis. So, unless you have a use case where you're running dumpPE frequently, I'm inclined to leave it as it is.