Add all option to cmp

[trathborne]

It's also useful to be able to report packages without a changed version!

Now displaying both versions in green with == instead of an arrow.

[lilydjwg]

There is a conflict here now. Could you resolve it?

[trathborne]

I resolved the conflict and handled the cases of only one of oldver/newver being None, though I'm not sure all of those will ever happen. This is a bit more change than I wanted just to add --all but I think distinguishing all of these cases could be useful for automation using nvchecker.

[trathborne]

Hmm, and maybe the part at the end which picks the arrow symbol and the color could be a dictionary lookup?

[lilydjwg]

The updated code doesn't look right. It always shows all versions and with a == symbol.

[lilydjwg]

which picks the arrow symbol and the color could be a dictionary lookup?

Yes, it'll look better.

[trathborne]

Haha it's a typo, if in the middle of the if..elif..elif..if..elif ... dictionary version coming right up!

[trathborne]

Dammit still buggy

[trathborne]

Ok now I think that's right. My mistake for coding before coffee!

[trathborne]

mypy is being pedantic. We know that the diff is going to have a 'delta'. Should that be diffstyles[diff.get('delta', 'equal')] to make mypy shut up?

[trathborne]

Any idea what will make mypy happy?

[lilydjwg]

When I can't make mypy happy and am sure my code is correct, I just tell mypy to shut up :-)