lfs: migrate most file filtering from threshold to custom filter
Migrate `lfs.threshold` to more powerful `lfs.filter` added by D4990618 so
people can specify what files to be stored in LFS with more flexibility.
This patch was authored by Jun Wu for the fb-experimental repo, to avoid using
matcher for efficiency[1]. All I've changed here is to register the new
'lfs.track' default so that the tests run cleanly, and adapt the subsequent
language changes. Migrating the remaining uses of 'lfs.threshold' can be done
separately since there's a fallback in place.
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-December/109388.html
#require test-repo execbit
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "`dirname "$TESTDIR"`"
look for python scripts without the execute bit
$ testrepohg files 'set:**.py and not exec() and grep(r"^#!.*?python")'
[1]
look for python scripts with execute bit but not shebang
$ testrepohg files 'set:**.py and exec() and not grep(r"^#!.*?python")'
[1]
look for shell scripts with execute bit but not shebang
$ testrepohg files 'set:**.sh and exec() and not grep(r"^#!.*(ba)?sh")'
[1]
look for non scripts with no shebang
$ testrepohg files 'set:exec() and not **.sh and not **.py and not grep(r"^#!")'
[1]