file_rev.py

from mercurial import (
    registrar,
    revset,
)

revsetpredicate = registrar.revsetpredicate()


@revsetpredicate('fromfile()')
def revset_fromfile(repo, subset, x):
    arg = revset.getargs(x, 1, 1, 'fromfile requires one argument')
    filename = revset.getstring(arg[0], 'fromfile requires a string argument')

    with open(filename, 'r') as fp:
        lines = [
            line for line in fp.readlines()
            if not line.strip().startswith("#")
        ]
        m = revset.matchany(repo.ui, lines)

    return subset & m(repo)