Piping in an alias support

[putrasattvika]

In zsh you can configure an alias like this:

alias myalias='yq -o json | jq -c .'

And (IIUIC) a command like cat file.yml | myalias will be "rendered" into cat file.yml | yq -o json | jq -c . before getting executed.

However, in xonsh it seems that we can't use pipes in an alias:

# Executing using the alias seems to break the input coming to jq
aliases['myalias'] = 'yq -o json | jq -c .'

$XONSH_TRACE_SUBPROC=True
cat file.yml | myalias
# TRACE SUBPROC: (['cat', 'file.yml'], '|', ['myalias']), captured=hiddenobject
# TRACE SUBPROC: (['yq', '-o', 'json'], '|', ['jq', '-c', '.']), captured=hiddenobject
# parse error: Invalid numeric literal at line 1, column 6

# Executing without using the alias works as expected
cat file.yml | yq -o json | jq -c .
# TRACE SUBPROC: (['cat', 'file.yml'], '|', ['yq', '-o', 'json'], '|', ['jq', '-c', '.']), captured=hiddenobject
# {"collections":[{"name":"kubernetes.core","version":"2.4.0","source":"https://galaxy.ansible.com"}]}

Is this behavior expected?

[anki-code]

This looks like a new feature - alias expanding.

[putrasattvika]

I managed to use this workaround seems to get the behavior I wanted. Alias expansion would be nice but currently (IMO) it's not yet necessary.

def __bash(cmd: str):
    return ['bash', '-c', cmd]

aliases['myalias'] = __bash('yq -o json | jq -c .')