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rubyfilefile-iocopyprogress

Ruby show progress when copying files

I'd like to be able to show the progress of a file copy operation when copying files using Ruby (currently using FileUtils.cp) I've tried setting the verbose option to true but that just seems to show me the copy command issued.

I'm running this script from command line at the moment so ideally I'd like to be able to present something like SCP does when it copies files, but I'm not too fussed about the presentation as long as I can see the progress.

Solution

  • As I don't have enough rep to edit answers yet here is my version based on pisswillis answer, I found a progress bar gem which I'm also using in my example. I have tested this and it has worked OK so far, but it could do with some cleaning up:

    require 'rubygems'
require 'progressbar'

in_name     = "src_file.txt"
out_name    = "dest_file.txt"

in_file     = File.new(in_name, "r")
out_file    = File.new(out_name, "w")

in_size     = File.size(in_name)
# Edit: float division.
batch_bytes = ( in_size / 100.0 ).ceil
total       = 0
p_bar       = ProgressBar.new('Copying', 100)

buffer      = in_file.sysread(batch_bytes)
while total < in_size do
 out_file.syswrite(buffer)
 p_bar.inc
 total += batch_bytes
 if (in_size - total) < batch_bytes
   batch_bytes = (in_size - total)
 end
 buffer = in_file.sysread(batch_bytes)
end
p_bar.finish