view tests/filtertraceback.py @ 42478:561cd02c58ff

cat: don't prefetch files unless the output requires it

It's a waste to cache lfs blobs when cat'ing the raw data at best, but a hassle
debugging when the blob is missing.  I'm not sure if there are other commands
that have '{data}' for output, and if there's a general way to prefetch on that
keyword.

It's interesting that the verbose output seems to leak into the JSON output, but
that seems like an existing bug.

#!/usr/bin/env python

# Filters traceback lines from stdin.

from __future__ import absolute_import, print_function

import sys

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 state == 'file':
        # Ignore lines after "  File "
        state = 'tb'
        continue

    print(line, end='')