How can I have my python file show its mercurial tag or revision as the module version?

Question

I'd like to add a --version command line option to my python application that will show the right version depending on the tagged status of the command:

If the file comes from a version whose short hex ID was abcdef01 that was tagged TAG, --version should show this:

MyApp Version TAG (abcdef01)

If the file comes from the tip, --version should show this:

MyApp (tip)

If the file comes from an arbitrary, untagged revision abcdef02, --version should show this:

MyApp (development, abcdef02)

Is this possible? If so, how?

Answer 1

Once you activate the keyword extension, you can have it in a variable which can be carved up for the hash.