emit no anchors and aliases

[Andrey]

Hi, is it possible to avoid using anchors and aliases? So to output

[1, 1]

as

- 1
- 1

and not as

- &id1 1
- *id1

[xi]

It works for me:

>>> import yaml
>>> print yaml.dump([1,1], default_flow_style=False)
- 1
- 1

Could you post a code snippet that produces the output with aliases?

[iand@…]

I can reproduce this with the following input, regardless of flow style. Having the option to disable anchors & aliases would be extremely handy for me.

import yaml print yaml.dump([1L, 1L])

[anonymous]

+1 - yaml loses a lot of usefulness when it isn't human readable, and having hundreds of aliases in a document with names like id001 is hard for me to parse.

[w@…]

This is actually really easy, it's just not documented:

class CustomDumper?(SafeDumper?):

A custom YAML dumper that never emits aliases"

def ignore_aliases(self, _data):

return True

Can this please be documented?

[anonymous]

Here is a quick script to remove anchors and aliases:

#!/usr/bin/python

"""Parse and re-emit YAML without aliases.
"""

import argparse
import sys
import yaml


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        'file', nargs='?', default='-', type=argparse.FileType('r'))
    args = parser.parse_args()

    Loader = yaml.SafeLoader
    Dumper = yaml.SafeDumper

    Dumper.ignore_aliases = lambda self, data: True
    yaml.dump(yaml.load(args.file, Loader=Loader), sys.stdout, Dumper=Dumper)

if __name__ == '__main__':
    sys.exit(main())

Save as ~/bin/yaml-rewrite

I use it as a git diff filter. Register with

git config --global diff.cleanyaml.textconv yaml-rewrite

and in .gitattributes:

*.yaml diff=cleanyaml