Shell: Add option to watch/reload the brain

[julien-c]

@kirsle If you like and merge this I will make the same changes to shell.coffee

[kirsle]

Does this do what you think? Try doing something like JSON.Stringify(rs, null, 2) and check the data tree, there might be duplicate triggers when you reload the bot.

A long time ago the RiveScript modules arranged data in a hierarchical object tree, like rs.topics["random"].triggers["hello bot"], so that when you reloaded the same replies again, the duplicates would overwrite their old locations in the data structure and things would just work. But now RiveScript loads the triggers into a giant array, and uses pointers into that array for other purposes (e.g. sorting the replies), but if you reload the bot brain I'd expect it to append the same set of RiveScript data to the bottom of the array and creating duplicates, and e.g. if you were to modify an existing trigger to have a different response, you might not actually get that response because the trigger was a duplicate and the original one would match instead of the new one, giving the old response.

The only good/fast way I can think to fully reload a bot that works this way would be to first clear out all the data and reparse the code from scratch.

[julien-c]

@kirsle Your last proposition is actually what I'm doing. In the loadBot function I'm instantiating a whole new RiveScript object and calling loadDirectory on it.

This was following my question (and your answer) here: #156

[julien-c]

PS: I've merged master back into this branch to keep it up-to-date using Github's UI, but I can properly rebase the pull request if you want.

[julien-c]

@kirsle I've pushed a few more tweaks. Let me know how you feel about this. Thanks!

[kirsle]

Is this to require the user to press enter? Is it necessary? I think most watcher things just notify of the reload and continue.

[julien-c]

Nope it's just to display the > input sign again in the terminal's last line. Necessary as we've been writing to the console.log. No user action needed of any sort.