Anki decks,
built from code.

let (front, back) = ("hola", "hello");
let mut deck = Deck::new("Spanish");
deck.basic().note(front, back).stable_id("es:hola").add()?;
let report = deck.write_apkg(output.join("spanish.apkg"))?;
report.ensure_success()?;

let text = "A sound's pitch depends on its {{c1::frequency}}.";
let extra = "More cycles per second, higher pitch.";
let mut project = Project::new("Sound")
    .stable_id("website-sound")
    .default_deck("Sound");
project.add_note(Note::cloze(text).extra(extra).stable_id("sound:pitch"))?;
let report = project.write_apkg(output.join("sound.apkg"))?;
report.ensure_success()?;

let (prompt, answer) = ("Name this pitch.", "A4, 440 Hz");
let picture = project
    .media_mut()
    .add_file(output.join("waveform.svg"))?
    .export_as("waveform.svg")?;
let audio = project
    .media_mut()
    .add_file(output.join("concert-a.wav"))?
    .export_as("concert-a.wav")?;
project.add_note(
    Note::new("ear-training")
        .stable_id("sound:a4")
        .text("prompt", prompt)
        .text("answer", answer)
        .image("picture", picture)
        .sound("audio", audio),
)?;
let report = project.write_apkg(output.join("ear-training.apkg"))?;
report.ensure_success()?;