mvln

#!/usr/bin/env ruby

# mvln
# 
# Usage:
# 
# mvln original_location new_location [symlink_location]
# 
# moves the file or directory at original_location to new_location,
# then makes a symlink to new_location at symlink_location.
# 
# symlink_location defaults to original_location
#
# Example:
#
# $ mvln ~/.ssh /Volumes/knox_vault/creds/
#
# Then you'd end up with your SSH keys stored safely away,
# with a symlink to the directory's new location in its place.
#
# made by James MacAulay in 2009
# http://jmacaulay.net

require 'ftools'

def mvln(*args)
  original_location, new_location, symlink_location = args[0..2]
  symlink_location ||= original_location

  if File.directory?(new_location)
    new_full_location = File.join(new_location, File.basename(original_location))
  elsif File.exist?(new_location)
    puts "Are you sure you want to clobber the existing file at #{File.expand_path(new_location)} [y/N]?"
    exit unless $stdin.gets =~ /^[yY]/
  end

  new_full_location ||= File.expand_path(new_location)
  
  `mv #{original_location} #{new_location}`
  File.symlink(new_full_location, symlink_location)
  puts new_full_location
end

mvln(*ARGV) if $0 == __FILE__