sip 0.3.0

Interactive Wayland screen-region selector with slurp-compatible output
Documentation 
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use std::fmt;
use std::str::FromStr;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Color {
    pub r: u8,
    pub g: u8,
    pub b: u8,
    pub a: u8,
}

impl Color {
    pub const fn rgba(r: u8, g: u8, b: u8, a: u8) -> Self {
        Self { r, g, b, a }
    }

    pub const fn from_rgba_u32(v: u32) -> Self {
        Self {
            r: (v >> 24) as u8,
            g: (v >> 16) as u8,
            b: (v >> 8) as u8,
            a: v as u8,
        }
    }

    pub fn to_skia(self) -> tiny_skia::Color {
        tiny_skia::Color::from_rgba8(self.r, self.g, self.b, self.a)
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ParseColorError(String);

impl fmt::Display for ParseColorError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "invalid color {:?}: expected #RRGGBB or #RRGGBBAA",
            self.0
        )
    }
}

impl std::error::Error for ParseColorError {}

impl FromStr for Color {
    type Err = ParseColorError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let hex = s.strip_prefix('#').unwrap_or(s);
        let err = || ParseColorError(s.to_owned());
        let word = match hex.len() {
            6 => (u32::from_str_radix(hex, 16).map_err(|_| err())? << 8) | 0xFF,
            8 => u32::from_str_radix(hex, 16).map_err(|_| err())?,
            _ => return Err(err()),
        };
        Ok(Self::from_rgba_u32(word))
    }
}