Commit graph

10 commits

Author SHA1 Message Date
William Carroll
730aecc076 Support NoteClass
Remodel application to support the scientific pitch notation for notes. Instead
of supporting simply "C", support "C4". This change created cascading
changes. After refactoring for around an hour, I restored the app to a working
state. The current state is not desirable, but it compiles. More changes on the
way.
2020-04-11 23:11:04 +01:00
William Carroll
808e6ee484 Support Misc module
Define two functions for attempting to return an element in a list that precedes
or succeeds another element.

I prefer having something like Utils.List. Perhaps I will refactor.
2020-04-11 23:10:14 +01:00
William Carroll
c24c9b7fb9 Support BPM for tempo
Using BPM as the unit for tempo.

TODO: Consider a higher-fidelity way to calculate BPM, although I'm not sure
this is critical functionality; an interesting problem is just seducing me, and
this app would be better off resisting the temptation.
2020-04-11 17:46:46 +01:00
William Carroll
93bdebf9b2 Track app ideas
Use an org file to track random ideas or features or improvements.
2020-04-11 17:44:20 +01:00
William Carroll
3c8bfe85c9 Prefer type alias to type
Elm reminds me of Haskell. In fact, I'm using `haskell-mode` (for now) in Emacs
to write my Elm code, and it works reliably. I'm not writing a Haskell app, but
if I were, I would define my application Model with the following Haskell code:

```haskell
data Model = Model { whitelistedChords :: [Theory.Chord]
                   , selectedChord :: Theory.Chord
                   , isPaused :: Bool
                   , tempo :: Int
                   }
```

When I first modelled my application state, I did something similar. After
reading more Elm examples of SPAs, I see that people prefer using type aliases
to define records. As far as I know, you cannot do this in Haskell; I believe
all types are "tagged" (something about "nominal typing" comes to mind). Anyhow,
Elm isn't Haskell; Haskell has cool features like type classes; Elm has cool
features like human-readable error messages and exhaustiveness checking for
cases. I love Haskell, and I love Elm, and you didn't ask.

Anyhow, this commit refactors my records as type aliases instead of types. I
think the resulting code is more readable and ergonomic.
2020-04-11 16:50:02 +01:00
William Carroll
52eb456a0f Support basic tempo
Supporting Play/Pause events, and Increase/Decrease tempo.

TODO: Convert milliseconds to BPM
2020-04-11 16:09:11 +01:00
William Carroll
2f446d0441 Improve the styling of the piano
Create a more convincing representation of the piano.

I would like to compute the left-offset based on the naturalWidth. That change
is probably forthcoming.
2020-04-11 11:36:37 +01:00
William Carroll
3562343c19 Generate all known chords and display randomly selected chords
First of all, Elm's purity is beautiful. I think every language should model
their error messages and develop experience after Elm. If I didn't have to
download packages, I don't think I would need an internet connection to
troubleshoot my program's errors. This is how helpful I find the compiler.

Now that that's out of the way, here's what I've changed since we've last
corresponded:
- Use Elm's Browser.element to create a reactive application with state
- Write a function to generate all of the chords about which CDS knows
- Move some code out of Main.elm into other modules
- Depend on List.Extra, Random, Random.Extra

What's left:
- Lots of work
- Instead of clicking a button to show a new chord, use a timer
- Add mobile-first styling (probably add TailwindCSS)
- Persist settings in LocalStorage (and then eventually create user accounts)
- Allow users to curate the list of chords they're interested in practicing
- Deploy the website and dogfood it

Unknowns:
- How can I handle tempo? I don't expect setInterval to be enough (maybe it
  is)...
2020-04-11 10:45:42 +01:00
William Carroll
b600f709b4 Model data and sketch ideas for Chord Drill Sergeant
Initialize an Elm application to build a MVP for the Chord Drill Sergeant
application. There isn't much to see at the moment. I'm just sketching
ideas. More forthcoming...
2020-04-10 23:03:01 +01:00
William Carroll
c350222fcc Create README for Chord Drill Sergeant
See the README for more information.

I've wanted to use an application like this for awhile. I would like to start
developing this soon.
2020-04-10 14:48:00 +01:00