Only source functions in a .R file

Question

I would like source() to only find and load functions within a .R file.

For example, in the file Analysis.R:

print.hw <         


        

Answer 1

I think its a good practice to separate test code before the end of source files (as we usually do in Python) and then invoke them with external scripts or packages (like testthat). Hadley's dplyr may give you a reference.

Answer 2

This works without using regex. It's also probably less computationally efficient than regex solutions. It creates a new environment, sources the entire file, then returns only the functions back to the global environment.

SourceFunctions<-function(file) {
  MyEnv<-new.env()
  source(file=file,local=MyEnv)
  list2env(Filter(f=is.function,x=as.list(MyEnv)),
           envir=parent.env(environment()))
}