[ttx_diff] make --help and --version work in absl-py #1771
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python -m ttx_diff --help wasn't showing any flags and telling users to use --helfull (which unhelpfully shows all absl-related flags which the user could care less). The problem is absl-py only shows flags from the "__main__" module in --help. So I moved them there to make it happy and `python -m ttx_diff --help` finally shows our flags. But still, when running via the installed `ttx-diff` entry point, because the `__name__` of that one was not '__main__', absl woudn't recognize it as the main module and end up showing no flags. So I resorted to runpy.run_module which executes the __main__.py module with run_name="__main__" mimicking `pyton -m module` behavior. So now both `pythom -m ttx_diff --help` and `ttx-diff --help` display all flags consistently. I also added a --version which absl-py doesn't provide out of the box.
rsheeter
approved these changes
Nov 20, 2025
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python -m ttx_diff --help wasn't showing any flags and telling users to use --helpfull (which unhelpfully shows all absl-related flags which the user could care less).
The problem is absl-py only shows flags from the "main" module in --help. So I moved them there to make it happy and
python -m ttx_diff --helpfinally shows our flags.But still, when running via the installed
ttx-diffentry point, because the__name__of that one was not 'main', absl woudn't recognize it as the main module and end up showing no flags.So I resorted to runpy.run_module which executes the main.py module with run_name="main" mimicking
pyton -m modulebehavior.So now both
pythom -m ttx_diff --helpandttx-diff --helpdisplay all flags consistently.I also added a --version which absl-py doesn't provide out of the box.