[libgpiod][PATCH 0/2] support casting line.Value to bool

[Kent Gibson <warthog618@gmail.com>]

While writing a gpiod plugin for gpiozero (Python), I had to map line.Value
to its bool equivalent.  Casting seemed the obvious way to go, as it is
essentially a boolean, but that didn't work as I expected - it always
returned True. This is the case for any Python type that does not provide
a suitable conversion operator.

This series adds support for casting line.Value to bool.

Patch 1 adds a test that comfirms the existing behaviour.
Patch 2 adds the __bool__() operator to make the Value behave as one
might expect.

As an aside, I couldn't for the life of me work out how to run the complete
python test suite.  There are no hints in the documentation.

There is a python-tests-run target in the Makefile, but that didn't work:

~/libgpiod/bindings/python$ make python-tests-run
PYTHONPATH=/home/kent/libgpiod/bindings/python
LD_LIBRARY_PATH=/home/kent/libgpiod/lib/.libs/:\
	/home/kent/libgpiod/tests/gpiosim/.libs/ \
python3 -B -m tests
/bin/bash: line 2: /home/kent/libgpiod/tests/gpiosim/.libs/: Is a directory
make: *** [Makefile:677: python-tests-run] Error 126

I tried fixing that but I still couldn't satisfy ld wrt the gpiosim
(I don't have libgpiod installed - just using the local build),
so gave up and called this particular test directly with

$ python -m unittest tests_line.py

While that passes, I can't guarantee it hasn't caused some other
breakage, though it seems very unlikely.

Kent Gibson (2):
  bindings: python: tests: add test for casting line.Value to bool
  bindings: python: support casting line.Value to bool

 bindings/python/gpiod/line.py       |  3 +++
 bindings/python/tests/Makefile.am   |  1 +
 bindings/python/tests/tests_line.py | 11 +++++++++++
 3 files changed, 15 insertions(+)
 create mode 100644 bindings/python/tests/tests_line.py

--
2.39.2