feat: add quit confirmation

[jondysinger]

Implements a prompt if the user initiates a quit from the base screen.

? Really quit? (y or n) ›

[altsem]

Thanks for working on this! :)

I think it might be nice to add some simple tests for quitting (tests/mod.rs), I think something like this could work:

#[test]
fn quit_prompt() {
    let mut ctx = TestContext::setup_init(80, 20);

    let mut state = ctx.init_state();
    state.update(&mut ctx.term, &[key('q')]).unwrap();
    insta::assert_snapshot!(ctx.redact_buffer());
}

#[test]
fn quit() {
    let mut ctx = TestContext::setup_init(80, 20);
    
    // TODO init_state should probably accept `Config` as an arg?
    let mut state = ctx.init_state();
    state.update(&mut ctx.term, &[key('q'), key('y')]).unwrap();
    // Might as well just make the `quit` field `pub`
    assert!(state.quit);
}

[jondysinger]

I added commits to close the prompt if the user cancels it and for the unit tests. I'm still planning on looking into having the functionality be dependent on configuration.

[jondysinger]

OK I added a config entry and defaulted the behavior to not confirm the quit. I then squashed my commits. It's ready for re-review.

[altsem]

Looks good and seems to work! :)
I just had a minor nitpick about the config file comment.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 54.28571% with 16 lines in your changes are missing coverage. Please review.

Project coverage is 85.52%. Comparing base (f526a46) to head (8405439).

Files	Patch %	Lines
src/state.rs	33.33%	16 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
- Coverage   85.84%   85.52%   -0.33%     
==========================================
  Files          37       37              
  Lines        3264     3295      +31     
==========================================
+ Hits         2802     2818      +16     
- Misses        462      477      +15     

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