perf: use the `perf--` prefix for perf command
This is the one command namespace where they should not be any ambiguity about
command that should be in it. The perf extensions is only adding performance
related command.
so this is a good ground to start putting dash folding to the tests.
Differential Revision: https://phab.mercurial-scm.org/D9516
from __future__ import absolute_import
import os
if os.environ.get('COVERAGE_PROCESS_START'):
try:
import coverage
import uuid
covpath = os.path.join(
os.environ['COVERAGE_DIR'], 'cov.%s' % uuid.uuid1()
)
cov = coverage.coverage(data_file=covpath, auto_data=True)
cov._warn_no_data = False
cov._warn_unimported_source = False
cov.start()
except ImportError:
pass