ledcat 0.0.1

Ledcat is simple utility that aims to provide a standard interface for driving LED-strips and such
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use std::io;
use clap;
use color::*;
use device::*;


pub struct Apa102 {
    /// 5-bit grayscale value to apply to all pixels.
    pub grayscale: u8,
}

impl Device for Apa102 {
    fn clock_phase(&self) -> u8 {
        0
    }

    fn clock_polarity(&self) -> u8 {
        0
    }

    fn first_bit(&self) -> FirstBit {
        FirstBit::MSB
    }

    fn color_correction(&self) -> Correction {
        Correction::srgb(255, 255, 255)
    }

    fn write_frame(&self, writer: &mut io::Write, pixels: &[Pixel]) -> io::Result<()> {
        writer.write_all(&[0x00; 4])?;
        for pix in pixels {
            writer.write_all(&[0b11100000 | self.grayscale, pix.b, pix.g, pix.r])?;
        }
        Ok(())
    }
}

pub fn command<'a, 'b>() -> clap::App<'a, 'b> {
    clap::SubCommand::with_name("apa102").arg(clap::Arg::with_name("grayscale")
        .short("g")
        .long("grayscale")
        .validator(validate_grayscale)
        .default_value("31")
        .help("Set the 5-bit grayscale for all pixels"))
}

pub fn from_command(args: &clap::ArgMatches) -> Box<Device> {
    let gs = args.value_of("grayscale").unwrap();
    Box::new(Apa102 { grayscale: gs.parse::<u8>().unwrap() })
}

fn validate_grayscale(v: String) -> Result<(), String> {
    match v.parse::<u8>() {
        Ok(i) => {
            if i <= 31 {
                Ok(())
            } else {
                Err(format!("Grayscale value out of range: 0 <= {} <= 31", i))
            }
        }
        Err(e) => Err(format!("{}", e)),
    }
}