Specify branch / commit instead of using HEAD for diff

[orangethunder]

I'm busy thinking about doing a pull request for this, but just need some general advice.

Is this a desirable feature? I may have missed something that already allows for this. It's very useful for me to be able to run pronto without checking out a branch first.

I'm thinking this would be the parameter:

    method_option :source_commit,
                  type: :string,
                  default: 'HEAD',
                  aliases: '-s',
                  desc: 'Source commit for the diff'

Then I could pass something like "origin/my_new_feature".

[mmozuras]

It's very useful for me to be able to run pronto without checking out a branch first.

@orangethunder we don't want to bloat Pronto too much. So before considering adding this feature, could you tell more about the use case? 🙂