It's common when writing scripts that install or configure things to need input from the user (at a minimum, something like 'Press Enter to continue'; at a maximum, to be able to prompt the user for input, with an optional default value, and return that value).

Let's use this issue to design how that would look, and I invite suggestions!

Currently, if I run bake command when the Bakefile is empty, the error message seems very scary:

Traceback (most recent call last):
  File "/home/redowan/.local/share/virtualenvs/flask-template-wBuRwttx/bin/bake", line 8, in <module>
    sys.exit(entrypoint())
  File "/home/redowan/.local/share/virtualenvs/flask-template-wBuRwttx/lib/python3.7/site-packages/click/core.py", line 764,

Current coverage is not bad (70+%) and in general and I don't want to embark on one of those 100%-coverage crusades. But I know there are parts of the interpreter that are undertested (and don't generally need a whole lot of tests) and it might be nice to get some quick wins in terms of coverage.

++ and -- aren't required, but we should have them.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_04