Renamespaces all Obective-C-based files recursively through a directory, including both filenames and inside the file.

renamespace.rb

#!/usr/bin/env ruby

# ruby renamespace.rb OLD NEW ./dir
# Works with headers, implementations, and plists.

old_prefix, prefix, root = ARGV

def update_file(filename, opts={})
  puts "Updating #{filename}."
  data = File.open(filename, 'r') { |f| f.read }
  data.gsub!(opts[:old], opts[:prefix])
  destination = filename.sub(opts[:old], opts[:prefix])
  File.open(destination, 'w') { |f| f.write data }
  File.delete(filename)
end

def scan_directory(directory, opts={})
  puts "Scanning #{directory}."
  Dir.entries(directory).each do |file|
    next if file =~ /^\./
    full_file = File.join(directory, file)
    puts "Checking #{full_file}."
    scan_directory(full_file, opts) if File.directory?(full_file)
    update_file(full_file, opts) if full_file =~ /\.(h|m|plist)$/
  end
end

scan_directory(File.absolute_path(root), old: old_prefix, prefix: prefix)