gstreamer/gst/parse/get_flex_version.py
Nirbheek Chauhan c164b88ac1 meson: Extract flex version using a regex inside a script
Different builds of Flex on different platforms output different strings
in --version. For example:

macOS:
flex 2.5.35 Apple(flex-31)

Windows:
win_flex.exe 2.6.4
C:\Program Files (x86)\GnuWin32\bin\flex.EXE version 2.5.4

We need to look for a string that looks like a version, which means
a regex till https://github.com/mesonbuild/meson/issues/1609 is fixed.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/356
2019-02-08 16:54:10 +05:30

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Python

#!/usr/bin/env python3
import re
import sys
import subprocess
flex = sys.argv[1]
out = subprocess.check_output([flex, '--version'], universal_newlines=True,
stderr=subprocess.STDOUT, stdin=subprocess.DEVNULL)
print(re.search(r'(\d+\.\d+(\.\d+)?)', out).group())