svn2gitify.rb

#!/usr/bin/ruby

# validate that we're in an actual git repository.
git_dir = "#{Dir.pwd}/.git"
exit unless File.exist?(git_dir)
paths = ["config", "info/refs", "logs/HEAD", "packed-refs"].map {|path| "#{git_dir}/#{path}" }

patterns = ['refs/remotes/origin', 'refs/remotes/svn']
ARGV.each do|arg|
  if arg == "--reverse" then
    patterns.reverse!
  end
end

# validate that all necessary files exist in the .git directory
paths.each do|path|
  if !File.exist?(path) then
    puts "missing file #{path}, exiting"
    exit
  end
end

# validate that all files we'll be renaming exist.
renamed_paths = ["logs/#{patterns[0]}", patterns[0], "svn/#{patterns[0]}"].map {|path| "#{git_dir}/#{path}" }
renamed_paths.each do|path|
  if !File.exist?(path) then
    puts "missing file #{path}, exiting"
    exit
  end
  path = path.sub(patterns[0], patterns[1])
  if File.exist?(path) then
    puts "file #{path} already exists, exiting"
    exit
  end
end

paths.each do|path|
  contents = File.read(path)
  new_contents = contents.gsub(patterns[0], patterns[1])

  # update the project if any substitutions were made
  if (new_contents != contents) then
    puts "Renaming '#{patterns[0]}' to '#{patterns[1]}' in file #{path}"
    # puts new_contents
    File.open(path, 'w') { |file| file.write(new_contents) }
  end
end

# do the rename if all substitutions have been performed.
renamed_paths.each do|path|
  new_path = path.sub(patterns[0], patterns[1])
  puts "Renaming '#{path}' to '#{new_path}'"
  File.rename(path, new_path)
end