prompt for user's input in case of undefined variables

[sify21]

Problem to solve

Currently an error is shown when undefined variable is met.

Proposal

Prompt the user for input of undefined variables. I believe this will provide a better user-experience, because they don't have to define those variables somewhere beforehand and run the command again.

Optionally, this behavior can be activated by a command-line switch like --interactive

Additional context and resources

Tasks to complete

• [ ] ...

[jcamiel]

Hi @sify21 This could be indeed useful but, as the same time, we're planning to remove --interactive as we're not testing it / using it and it bring some complexity to the implementation see #3763

[sify21]

Then maybe add a new switch, for example --ask-variable, to avoid breaking others' existing workflows.