tests/test-check-pyflakes.t

tests: use pyflakes module instead of pyflakes executable

This results in that the pyflakes version specific to the configured Python
version is used.

This way, both the Python 2-specific and the Python 3-specific pyflakes are run
by the test suite (depending on the configured Python version).

For downstream projects which are using Mercurial’s test infrastructure and are
not yet ported to Python 3 (e.g. hg-git) it ensures that the correct pyflakes
version is run even when the system’s default pyflakes is the Python 3-specific
one.

#require test-repo pyflakes hg10

  $ . "$TESTDIR/helpers-testrepo.sh"

run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)

  $ cat > test.py <<EOF
  > print(undefinedname)
  > EOF
  $ pyflakes test.py 2>/dev/null | "$TESTDIR/filterpyflakes.py"
  test.py:1: undefined name 'undefinedname'
  
  $ cd "`dirname "$TESTDIR"`"

  $ testrepohg locate 'set:**.py or grep("^#!.*python")' \
  > -X hgext/fsmonitor/pywatchman \
  > -X mercurial/pycompat.py -X contrib/python-zstandard \
  > -X mercurial/thirdparty/cbor \
  > -X mercurial/thirdparty/concurrent \
  > -X mercurial/thirdparty/zope \
  > 2>/dev/null \
  > | xargs $PYTHON -m pyflakes 2>/dev/null | "$TESTDIR/filterpyflakes.py"
  contrib/perf.py:*: undefined name 'xrange' (glob) (?)
  mercurial/hgweb/server.py:*: undefined name 'reload' (glob) (?)
  mercurial/util.py:*: undefined name 'file' (glob) (?)
  mercurial/encoding.py:*: undefined name 'localstr' (glob) (?)