stream-clone: stop getting the file size of all file in v3
The point of v3 is to do less work in the locked section. It was currently not
the case.
This significantly boost performance. The following number comes from a large
private repository using perf::stream-locked-section:
base-line: 35.03 seconds
this-change: 24.50 seconds (-30%)
#!/usr/bin/env python3
# Filters traceback lines from stdin.
import io
import sys
if sys.version_info[0] >= 3:
# Prevent \r from being inserted on Windows.
sys.stdout = io.TextIOWrapper(
sys.stdout.buffer,
sys.stdout.encoding,
sys.stdout.errors,
newline="\n",
line_buffering=sys.stdout.line_buffering,
)
state = 'none'
for line in sys.stdin:
if state == 'none':
if line.startswith('Traceback '):
state = 'tb'
elif state == 'tb':
if line.startswith(' File '):
state = 'file'
continue
elif not line.startswith(' '):
state = 'none'
elif not line.replace('^', '').replace('~', '').strip():
# PEP 657: Fine-grained error locations in tracebacks
# ~~~~~~^^^^^^^^^
continue
elif state == 'file':
# Ignore lines after " File "
state = 'tb'
continue
print(line, end='')