a3s-tui 0.1.4

TEA (The Elm Architecture) framework for terminal user interfaces
Documentation 
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use std::time::Duration;

use crate::cmd::{self, Cmd};
use crate::element::{Element, TextElement};
use crate::style::Color;

pub struct Spinner {
    frames: Vec<&'static str>,
    current: usize,
    title: String,
    active: bool,
    color: Color,
}

#[derive(Debug, Clone)]
pub struct SpinnerTick;

impl Spinner {
    pub fn new() -> Self {
        Self {
            frames: vec![
                "\u{28cb}", "\u{2819}", "\u{2839}", "\u{2838}", "\u{283c}", "\u{2834}", "\u{2826}",
                "\u{2827}", "\u{2807}", "\u{280f}",
            ],
            current: 0,
            title: String::new(),
            active: true,
            color: Color::Cyan,
        }
    }

    pub fn with_title(mut self, title: impl Into<String>) -> Self {
        self.title = title.into();
        self
    }

    pub fn with_frames(mut self, frames: Vec<&'static str>) -> Self {
        self.frames = frames;
        self
    }

    pub fn with_color(mut self, color: Color) -> Self {
        self.color = color;
        self
    }

    pub fn tick(&mut self) {
        if self.active {
            self.current = (self.current + 1) % self.frames.len();
        }
    }

    pub fn tick_cmd<M: From<SpinnerTick> + Send + 'static>() -> Cmd<M> {
        cmd::tick(Duration::from_millis(80), SpinnerTick.into())
    }

    pub fn start(&mut self) {
        self.active = true;
    }

    pub fn stop(&mut self) {
        self.active = false;
    }

    pub fn is_active(&self) -> bool {
        self.active
    }

    pub fn element<Msg>(&self) -> Element<Msg> {
        if self.active {
            let text = format!("{} {}", self.frames[self.current], self.title);
            Element::Text(TextElement::new(text).fg(self.color))
        } else {
            Element::Text(TextElement::new(&self.title))
        }
    }

    pub fn view(&self) -> String {
        if self.active {
            format!("{} {}", self.frames[self.current], self.title)
        } else {
            self.title.clone()
        }
    }
}

impl Default for Spinner {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn new_spinner_is_active() {
        let s = Spinner::new();
        assert!(s.is_active());
    }

    #[test]
    fn tick_advances_frame() {
        let mut s = Spinner::new();
        let first = s.frames[0];
        s.tick();
        assert_eq!(s.current, 1);
        assert_ne!(s.frames[s.current], first);
    }

    #[test]
    fn tick_wraps_around() {
        let mut s = Spinner::new();
        for _ in 0..s.frames.len() {
            s.tick();
        }
        assert_eq!(s.current, 0);
    }

    #[test]
    fn stop_prevents_tick() {
        let mut s = Spinner::new();
        s.stop();
        assert!(!s.is_active());
        s.tick();
        assert_eq!(s.current, 0);
    }

    #[test]
    fn with_title() {
        let s = Spinner::new().with_title("Loading");
        let view = s.view();
        assert!(view.contains("Loading"));
    }
}