r-matrix 2.0.6

Rust port of cmatrix.
Documentation 
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use clap::{ArgAction, Parser};

use super::MatrixColor;

#[derive(Debug, Parser)]
#[command(
    name = "rmatrix",
    about = "Shows a scrolling 'Matrix' like screen in your terminal"
)]
struct Opt {
    #[arg(short = 'b', action = ArgAction::Count)]
    /// Bold characters on
    bold: u8,

    #[arg(short = 'l', long = "console")]
    /// Linux mode (use matrix console font)
    console: bool,

    #[arg(short = 'o', long = "oldstyle")]
    /// Use old-style scrolling
    oldstyle: bool,

    #[arg(short = 's', long = "screensaver")]
    /// "Screensaver" mode, exits on first keystroke
    screensaver: bool,

    #[arg(short = 'x', long = "xwindow")]
    /// X window mode, use if your xterm is using mtx.pcf
    xwindow: bool,

    #[arg(
        short = 'u',
        long = "update",
        default_value = "4",
        value_parser = validate_update
    )]
    /// Screen update delay
    update: usize,

    #[arg(
        short = 'C',
        long = "colour",
        default_value = "green",
        value_parser = ["green", "red", "blue", "white", "yellow", "cyan", "magenta", "black"]
    )]
    colour: String,

    #[arg(short = 'r', long = "rainbow")]
    /// Rainbow mode
    rainbow: bool,
}

fn validate_update(n: &str) -> Result<usize, &'static str> {
    if let Ok(n) = n.parse::<usize>()
        && n <= 10
    {
        return Ok(n);
    }
    Err("must be a number between 1 and 10")
}

/// The global state object
pub struct Config {
    pub bold: isize,
    pub console: bool,
    pub oldstyle: bool,
    pub screensaver: bool,
    pub xwindow: bool,
    pub update: usize,
    pub colour: MatrixColor,
    pub rainbow: bool,
    pub pause: bool,
}

impl Default for Config {
    /// Get the new config object based on command line arguments
    fn default() -> Self {
        let opt = Opt::parse();

        let colour = match opt.colour.as_ref() {
            "green" => MatrixColor::Green,
            "red" => MatrixColor::Red,
            "blue" => MatrixColor::Blue,
            "white" => MatrixColor::White,
            "yellow" => MatrixColor::Yellow,
            "cyan" => MatrixColor::Cyan,
            "magenta" => MatrixColor::Magenta,
            "black" => MatrixColor::Black,
            _ => unreachable!(),
        };

        Config {
            bold: opt.bold as isize,
            console: opt.console,
            oldstyle: opt.oldstyle,
            screensaver: opt.screensaver,
            xwindow: opt.xwindow,
            update: opt.update,
            rainbow: opt.rainbow,
            colour,
            pause: false,
        }
    }
}

impl Config {
    /// Update the config based on any keypresses
    pub fn handle_keypress(&mut self, keypress: char) -> bool {
        // Exit if in screensaver mode
        if self.screensaver {
            return true;
        }

        match keypress {
            'q' => return true,
            'b' => self.bold = 1,
            'B' => self.bold = 2,
            'n' => self.bold = 0,
            '!' => {
                self.colour = MatrixColor::Red;
                self.rainbow = false;
            }
            '@' => {
                self.colour = MatrixColor::Green;
                self.rainbow = false;
            }
            '#' => {
                self.colour = MatrixColor::Yellow;
                self.rainbow = false;
            }
            '$' => {
                self.colour = MatrixColor::Blue;
                self.rainbow = false;
            }
            '%' => {
                self.colour = MatrixColor::Magenta;
                self.rainbow = false;
            }
            'r' => {
                self.rainbow = true;
            }
            '^' => {
                self.colour = MatrixColor::Cyan;
                self.rainbow = false;
            }
            '&' => {
                self.colour = MatrixColor::White;
                self.rainbow = false;
            }
            'p' | 'P' => self.pause = !self.pause,
            '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | '0' => {
                self.update = keypress as usize - 48 // Sneaky way to avoid parsing
            }
            _ => {}
        }
        false
    }
}