Add --numeric-version flag.

[pjonsson]

The json output flag just added is meant for other tools. Adding --numeric-version, which is also meant for tools, in the same release seems reasonable. This change allows HLint to preserve the numeric-version behaviour across different releases of cmdargs.

I hacked the flag into main mode. I'm not sure if it should go elsewhere--it's definitely a common flag. Setting the group name for the flag alters the group name for the entire mode rather than putting the numeric-version flag in the common section.

I still have the TODO for cmdargs support on my list, but haven't gotten around to that yet.

[ndmitchell]

I'm tempted to say let's put this in cmdargs directly, and not bother with a temporary hack to hlint - I worry once I have added it to cmdargs, then HLint might go a bit weird. I suggest we delay the next HLint release until:

• @carymrobbins has changed the JSON span output, as per Added --json option and tests. #61
• Either myself or @pjonsson has added Add --numeric-version as default cmdargs#9, parsing the summary and autogenerating the --numeric-version flag. I appreciate this is a relatively large change to cmdargs, so am happy to do it myself.

And probably aiming for a Wed/Thur release, if that suits you two?

[pjonsson]

I'm good with anything that gives 1.9.1 a --numeric-version option. If we're in a hurry and you have the spare cycles for the cmdargs hacking that is probably the quickest way to get things moving.

[ndmitchell]

Btw, by putting it in cmdargs, it will be dependent on someones cmdargs version whether they have --numeric-version, so I still recommend you check both --numeric-version and fallback to --version for the next few months.

[pjonsson]

You do not plan to increase the lower bound for cmdargs for the next HLint release?

[ndmitchell]

My plan would be not to bother (it just makes upgrading for users slightly harder), but if it makes a difference to you I'll do so.

[pjonsson]

Nah, leave it as it is. I'll close this ticket since it really belongs in cmdargs.

[ndmitchell]

@pjonsson @carymrobbins I've just released cmdargs with support for --numeric-version and HLint with the --json flag. Let me know if you need anything else.

[carymrobbins]

This is great, thanks @ndmitchell!