gnome-randr 0.1.0

use gnome_randr::DisplayConfig;
use structopt::StructOpt;

#[derive(StructOpt)]
pub struct CommandOptions {
    #[structopt(
        help = "the connector used for the physical monitor.",
        long_help = "query by the connector used for the physical monitor, e.g. \"HDMI-1\". You can find these with \"query\" (no arguments) if you're unsure."
    )]
    pub connector: Option<String>,

    #[structopt(short, long)]
    pub summary: bool,
}

#[derive(Debug)]
pub enum Error {
    NotFound,
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "{}",
            match &self {
                Error::NotFound => "fatal: unable to find output.",
            }
        )
    }
}

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

pub fn handle(
    opts: &CommandOptions,
    config: &DisplayConfig,
) -> Result<String, Box<dyn std::error::Error>> {
    Ok(match &opts.connector {
        Some(connector) => {
            let (logical_monitor, physical_monitor) =
                config.search(connector).ok_or(Error::NotFound)?;

            if opts.summary {
                format!("{}", logical_monitor)
            } else {
                format!("{}\n{}", logical_monitor, physical_monitor)
            }
        }
        None => {
            if opts.summary {
                let mut s = String::new();
                config.format(&mut s, true)?;
                s.to_string()
            } else {
                format!("{}", config)
            }
        }
    })
}