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# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Utilities for invoking executables.
"""
import subprocess
import re
import sys
# Regex for matching 7-bit and 8-bit C1 ANSI sequences.
# Credit: https://stackoverflow.com/a/14693789/4692014
_ANSI_ESCAPE_8BIT_REGEX = re.compile(
r"""
(?: # either 7-bit C1, two bytes, ESC Fe (omitting CSI)
\x1B
[@-Z\\-_]
| # or a single 8-bit byte Fe (omitting CSI)
[\x80-\x9A\x9C-\x9F]
| # or CSI + control codes
(?: # 7-bit CSI, ESC [
\x1B\[
| # 8-bit CSI, 9B
\x9B
)
[0-?]* # Parameter bytes
[ -/]* # Intermediate bytes
[@-~] # Final byte
)
""", re.VERBOSE)
def run_and_tee_output(args):
"""Runs the test executable passing-thru its output to stdout (in a
terminal-colors-friendly way). Waits for the executable to exit.
Returns:
The full executable output as an UTF-8 string.
"""
# Capture stdout (where test results are written), but inherit stderr. This
# way errors related to invalid arguments are printed normally.
proc = subprocess.Popen(args, stdout=subprocess.PIPE)
captured_output = b''
while proc.poll() is None:
buf = proc.stdout.read()
# Write captured output directly, so escape sequences are preserved.
sys.stdout.buffer.write(buf)
captured_output += buf
captured_output = _ANSI_ESCAPE_8BIT_REGEX.sub(
'', captured_output.decode('utf-8'))
return captured_output
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