paerocom cli should have a --version argument

[jgriesfeller]

In the Unix world it's a good practice for every program to provide an easy way of determining it's version number. Usually that is done with a --version command line option.

The purpose for me is to determine easily on which version number I am.

[avaldebe]

Should we add some additional info listing the installed pya dependencies? This is quite easy to implement with importlib.metadata.version Here is an example, from one of my CLI apps

$ utils4cwf -V

utils4cwf (0.4.0)
dependencies (installed version)

data formats
netCDF4 (1.5.5.1), eccodes (1.3.3), cfgrib (0.9.9.1), pyarrow (6.0.0)

data manipulation
dask (2021.11.1), xarray (0.20.1), scipy (1.6.1), numpy (1.19.5)

remote execution
fabric (2.6.0), invoke (1.6.0), paramiko (2.8.0)

configuration
python-dotenv (0.19.2), toml (0.10.2)

command line
typer (0.4.0), click (8.0.3)

[jgriesfeller]

Sounds like a good idea What I was after can be achieved like this

>>> import pyaerocom
>>> from importlib.metadata import version
>>> version('pyaerocom')
'0.12.2.dev1'

This is so small that I can implement it right away in https://github.com/metno/pyaerocom/blob/main-dev/pyaerocom/scripts/cli.py

[avaldebe]

on the current version you can get __version__ as follows

>>> from pyaerocom import __version__
>>> print(__version__)
0.12.2.dev1

which I implemented using importlib.metadata.version

https://github.com/metno/pyaerocom/blob/3e8048895bbd403e504a99e38967f43afc441dbf/pyaerocom/__init__.py#L6

This is so small that I can implement it right away in https://github.com/metno/pyaerocom/blob/main-dev/pyaerocom/scripts/cli.py

Yes, you could just do that. However, I would take the opportunity to re-implement pyaerocom.scripts.cli using typer.

[jgriesfeller]

Then just do it, I am too used to argparse.

[avaldebe]

addressed by #624