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"""Return the version number from running ``dot -V``."""
import logging
import re
import subprocess
import typing
from . import dot_command
from . import execute
VERSION_PATTERN = re.compile(r'''
graphviz[ ]
version[ ]
(\d+)\.(\d+)
(?:\.(\d+)
(?:
~dev\.\d{8}\.\d{4}
|
\.(\d+)
)?
)?
[ ]
''', re.VERBOSE)
log = logging.getLogger(__name__)
def version() -> typing.Tuple[int, ...]:
"""Return the upstream version number tuple from ``stderr`` of ``dot -V``.
Returns:
Two, three, or four ``int`` version ``tuple``.
Raises:
graphviz.ExecutableNotFound: If the Graphviz executable is not found.
graphviz.CalledProcessError: If the exit status is non-zero.
RuntimeError: If the output cannot be parsed into a version number.
Example:
>>> doctest_mark_exe()
>>> import graphviz
>>> graphviz.version() # doctest: +ELLIPSIS
(...)
Note:
Ignores the ``~dev.<YYYYmmdd.HHMM>`` portion of development versions.
See also:
Upstream release version entry format:
https://gitlab.com/graphviz/graphviz/-/blob/f94e91ba819cef51a4b9dcb2d76153684d06a913/gen_version.py#L17-20
"""
cmd = [dot_command.DOT_BINARY, '-V']
proc = execute.run_check(cmd,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
encoding='ascii')
ma = VERSION_PATTERN.search(proc.stdout)
if ma is None:
raise RuntimeError(f'cannot parse {cmd!r} output: {proc.stdout!r}')
return tuple(int(d) for d in ma.groups() if d is not None)
|
