Use database command

[srafi1]

Adds the use <database> command to switch branches. Fetches a remote branch if it is not locally available.

Closes #107

[filhodanuvem]

Awesome work @srafi1 .
I'm trying to start creating functional tests. Tests where we run gitql enterily and try to check if the command has failed or printed the expected output.

I would appreciate if you create a new file called use.bats as I did at this example . Two tests would be expected, first one is just to check that the exit code is zero (exactly what I did in the example ) when we run gitql "use master". Another one checking the failure case, the exit code should not be zero if we try to switch to a not existent branch.

[srafi1]

Thanks @filhodanuvem! It took a few tries to get bats working properly because use master changes the branch (which removes the tests in the process), but I think I got it done correctly.

[filhodanuvem]

🤣 that's funny and sad at the same time. Thank you for the effort!