[R] Displaying environment differences

[Barry Rowlingson]

Sometimes after playing around in R for a while, I find myself thinking, 
"What have I done?". Which boils down to "What's the difference between 
the objects I currently have in my R session and those that were loaded 
from my .RData when I started R".

So I bashed this out in five minutes, just to test the principles.
differ <- function(file){
  load(file)
  inFile <- ls()
  inMemory <- ls(1)
  inBoth <- inFile[inFile %in% inMemory]
  for(thing in inBoth){
    if(identical(get(thing,1),get(thing))){
      cat(paste("Object :",thing," identical\n"))
    }else{
      cat(paste("Object :",thing," changed\n"))
    }
  }
  list(inFile,inMemory,inBoth)
}
 Eventually I'd make it display objects only in the .RData (these would 
be things deleted since load), only in environment 1 (things newly 
created since load), those in both but unchanged, and those in both yet 
changed.

 But then I thought, "Hey, its coffee time, lets see if anyone on 
R-help has done this already and when I get back refreshed it'll be done".

 I'm also not sure if 'get()'ting the things is the right thing to do.
Barry
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