こんな感じです。

def listup(path, exclusion)
　time_format = "%Y-%m-%d %H:%M:%S"
　fullpath = File.expand_path(path)
　print "\"dirname\",", "\"basename\",", "\"extension\",", "\"size(byte)\",", "\"ctime\",", "\"mtime\",", "\"atime\",", "\"sha1\"\n"
　begin
　　Find.find(fullpath) do |entry|
　　　begin
　　　　if exclusion != nil and entry =~ /#{exclusion}/
　　　　　next
　　　　end
　　　　if File.file?(entry)
　　　　　ctime = File::stat(entry).ctime
　　　　　mtime = File::stat(entry).mtime
　　　　　atime = File::stat(entry).atime
　　　　　print "\"#{File::dirname(entry)}\","
　　　　　print "\"#{File::basename(entry)}\","
　　　　　print "\"#{File::extname(entry).downcase}\","
　　　　　print "\"#{File::stat(entry).size}\","