comparison mercurial/configitems.py @ 44382:f0027a3dd7cb

revlog-compression: update the config to be a list

format.revlog-compression is now a list of engine, the first supported one is to
be used. Doing this have several benefits:

1) this is fully backward compatible, config using a single entry will be read
as a single item list, not changing any behavior.

2) This open the way to use zstd by default without impacting platform were it
is not available. This will be done in a later changesets.

Using zstd provide a significant performance boost explained in : bb271ec2fbfb.
However zstd is not available in some cases, A notable example is the `--pure`
version of Mercurial which doesn't come with zstd support.

Differential Revision: https://phab.mercurial-scm.org/D8148

44381:454bc51f114c

    b'format', b'sparse-revlog', default=True,
)
coreconfigitem(
    b'format',
    b'revlog-compression',
    default=b'zlib',
    alias=[(b'experimental', b'format.compression')],
)
coreconfigitem(
    b'format', b'usefncache', default=True,
)

44382:f0027a3dd7cb

    b'format', b'sparse-revlog', default=True,
)
coreconfigitem(
    b'format',
    b'revlog-compression',
    default=lambda: [b'zlib'],
    alias=[(b'experimental', b'format.compression')],
)
coreconfigitem(
    b'format', b'usefncache', default=True,
)