Switching boards about cursello HOT 3 CLOSED

#2 has been implemented and closed.

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the main work on this PR will likely be in saving/reading from disk. Right now, the board is always stored as items.yaml in ~/.config/cursello/ (See modules/storage.py). We want the ability to store multiple boards here, accessed by name. When trying to open a board named my_board, for instance, cursello might look for my_board.yaml (also in ~/.config/cursello/) before opening a blank version. Also, when saving, cursello will save the board as the name it was opened (my_board.yaml), unless specified otherwise.

This made me realize we haven't addressed what ought happen when a user runs cursello with no additional arguments. Until now, we've only had one board to worry about, but multiple boards introduces the question of what ought happen when no arguments are passed to cursello.

Here is my envisioned usage:

$ ./cursello.py - opens ~/.config/cursello/items.yaml as a somewhat "default" board.

$ ./cursello.py my_board - opens ~/.config/cursello/my_board.yaml.

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Additionally, cursello should remember the name of the board it is working on. I think we should implement a w command for manual saving. This, and the current method of saving at quit should default to saving the board from the file it was opened as (for example, w board2.yaml writes to ~/.configs/cursello/board2.yaml).

I think w should open a barInput that says something along the lines of "Enter the name for this board to be saved as, or leave blank to use put_board_name_here:"

Also, we should have a command to open a board by name from ~/.config/cursello/`. This is the "command to switch to a new board" I mentioned. Again, if you have unsaved changes, it prompts before opening. I haven't decided what letter this should correspond to. Whoever PR's this one can decide something intuitive, and we can tweak it later if need be.

Thoughts on this usage of w command? Thoughts on my earlier comment's command line usage? Thoughts on the open command?

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