#!/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='')