YAML symbol grep

extract-metadata.zsh

find . -iname "*.gem" | while read file; do
  file=$(basename $file)
  mkdir -p ../metadata/${file:0:1}/${file:1:1}
  tar -xOf ./$file metadata.gz | gunzip -c > ../metadata/${file:0:1}/${file:1:1}/$file:r.metadata ||
    tar -xOf ./$file metadata > ../metadata/${file:0:1}/${file:1:1}/$file:r.metadata &&
    echo ${file:0:1}/${file:1:1}/$file:r.metadata
done

yaml-symbol-grep.rb

require 'psych'

# Already extracted metadata from all gems into g/e/gem-1.0.0.metadata style paths.

Dir.glob("?/?/*.metadata") do |file|
  begin
    Psych.parse_file(file).each do |node|
      if node.tag =~ %r{\A!ruby/sym(bol)?(\:.*)?\Z} or (node.is_a? Psych::Nodes::Scalar and node.tag.nil? and not node.quoted and node.value and node.value[/\A:/])
        puts "#{file}: #{node.value}"
      end
    end
  rescue Psych::SyntaxError
    $stderr.write "#{file}: Syntax Error: #{$!}\n"
  end
end