catfx 0.1.0

Apply effects to a text stream
Documentation 
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//! Miscellaneous utils.
use crate::color::Color;
use owo_colors::OwoColorize;
use std::fmt::{self, Display};

/// A helper to dynamically format based on optional foreground and background colors.
#[derive(Debug)]
pub struct Colorized<'a, D: Display> {
    display: D,
    foreground: &'a Option<Color>,
    background: &'a Option<Color>,
}

impl<'a, D> Colorized<'a, D>
where
    D: Display,
{
    /// Creates a new colorized display.
    pub fn new(display: D, foreground: &'a Option<Color>, background: &'a Option<Color>) -> Self {
        Self {
            display,
            foreground,
            background,
        }
    }
}

impl<D> Display for Colorized<'_, D>
where
    D: Display,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let fg = self.foreground.map(|c| c.into_owo());
        let bg = self.background.map(|c| c.into_owo());
        match (fg, bg) {
            (Some(fg), Some(bg)) => write!(f, "{}", self.display.color(fg).on_color(bg)),
            (Some(fg), None) => write!(f, "{}", self.display.color(fg)),
            (None, Some(bg)) => write!(f, "{}", self.display.on_color(bg)),
            (None, None) => write!(f, "{}", self.display),
        }
    }
}