sieve + mysqldump --skip-comments is broken

[abg]

sieve's tokenizer currently relies on comments to detect section types. This needs to be made more intelligent to support more dump formats.

Currently this should be at least classified as a bug as it raises an unchecked exception:

$ ./dbsake sieve -O < sakila_skip_comments.sql
Uncaught exception! (╯°□°)╯ ︵ ┻━┻
Traceback (most recent call last):
  File "/usr/lib64/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "./dbsake.sh/__main__.py", line 21, in <module>
    sys.exit(main())
  File "./dbsake.sh/__main__.py", line 18, in main
    sys.exit(dbsake.cli.main())
  File "./dbsake/cli/__init__.py", line 123, in main
    dbsake(args=argv, auto_envvar_prefix='DBSAKE', obj={})
  File "./dbsake.sh/click/core.py", line 488, in __call__
    return self.main(*args, **kwargs)
  File "./dbsake.sh/click/core.py", line 474, in main
    self.invoke(ctx)
  File "./dbsake.sh/click/core.py", line 758, in invoke
    return self.invoke_subcommand(ctx, cmd, cmd_name, ctx.args[1:])
  File "./dbsake.sh/click/core.py", line 767, in invoke_subcommand
    return cmd.invoke(cmd_ctx)
  File "./dbsake.sh/click/core.py", line 659, in invoke
    ctx.invoke(self.callback, **ctx.params)
  File "./dbsake.sh/click/core.py", line 325, in invoke
    return callback(*args, **kwargs)
  File "/home/abg/projects/pristine/dbsake/dbsake/cli/cmd/sieve.py", line 139, in sieve_cli
    stats = sieve.sieve(options)
  File "./dbsake/core/mysql/sieve/__init__.py", line 70, in sieve
    with open_stream(options) as input_stream:
  File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "./dbsake/util/compression.py", line 77, in decompressed_fileobj
    ext = magic_to_ext(fileobj)
  File "./dbsake/util/compression.py", line 68, in magic_to_ext
    raise OSError(errno.EIO, "Failed to detect compression type")
OSError: [Errno 5] Failed to detect compression type
It's okay. ┬─┬ノ( º_ ºノ)
Consider filing a bug report at https://github.com/abg/dbsake/issues