global search and replace for filenames and file contents implemented in ruby with gsed

gg

#!/usr/bin/env ruby
# USAGE gg "hello world" "hola mundo"
# * requirements: gem install posix-spawn, sudo port install coreutils (gsed)
# * changes file names and file contents (in the right order!)
# * limited regex support - it has to work with `system 'gsed', '--in-place', '-e', "s%#{search}%#{replace}%g", path`

require 'posix/spawn'
require 'fileutils'

force = ENV['FORCE'] == 'true'
search = ARGV[0]
replace = ARGV[1]

if ARGV.length > 2

  content_paths = filename_paths = ARGV[2..-1]

  unless content_paths.all? { |path| File.exist?(path) }
    raise "#{path} doesn't exist"
  end

else

  child = POSIX::Spawn::Child.new 'ack', '--nofilter', '-l', '--print0', search
  content_paths = child.out.split("\0")

  filename_paths = Dir["**/*#{search}*"]

end

puts content_paths.join("\n")
puts

replace_content = force || begin
  $stdout.write "Replace content? (y/n) "
  (($stdin.gets.chomp) == 'y')
end

replace_in_filename = if force
  true
elsif filename_paths.any?
  puts filename_paths.join("\n")
  puts
  $stdout.write "Replace in filename? (y/n) "
  (($stdin.gets.chomp) == 'y')
end

if replace_content
  content_paths.each do |path|
    puts "Replacing content in #{path}..."
    system 'gsed', '--in-place', '-e', "s%#{search}%#{replace}%g", path
  end
end

if replace_in_filename
  filename_paths.each do |path|
    puts "Replacing in filename #{path}..."
    basename = File.basename path
    dirname = File.dirname path
    new_path = File.join(dirname, basename.sub(search, replace))
    if path != new_path
      FileUtils.mv path, new_path
    end
  end
end