Brain-Flak debug flags

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For whatever purpose, either hunting down errors in your brain-flak code or for trying to pin down a bug in the interpreter a debugger would be very useful. This has been touched upon elsewhere so I figured it would be a good idea to have a place to discuss the idea.

From @DJMcMayhem on the subject of the debugger

I don't know what that will look like, but it will probably be a CLI flag (probably -d) and some commands to display

• The active stack
• A specific stack
• The result of a function call

and a way to pause for user input, as well as maybe some others.

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I have pushed a version of the program where most of the interpreter's functionality has been refactored into its own class. It is missing @Wheatwizard's changes for the moment.

[DJMcMayhem]

Haha, we happened to make changes at the same time. That might make it really hard to merge the two back together.

[DJMcMayhem]

We should setup a brain-flak chatroom so we can talk about potential changes faster than over commenting. I can set one up on stackoverflow. Do you have an account there?

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Yup, same username as on Github

[DJMcMayhem]

Here you go: http://chat.stackexchange.com/rooms/41599/brain-flak

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Completed by pull request #15