xremap 0.5.0

Dynamic key remapp for X and Wayland
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use crate::client::Client;
use std::env;
use std::fs::read_dir;
use std::os::unix::ffi::OsStrExt;
use swayipc::Connection;

pub struct SwayClient {
    connection: Option<Connection>,
}

impl SwayClient {
    pub fn new() -> SwayClient {
        SwayClient { connection: None }
    }

    fn connect(&mut self) {
        if let None = self.connection {
            if let Err(env::VarError::NotPresent) = env::var("SWAYSOCK") {
                let path = match find_socket() {
                    Some(path) => path,
                    None => {
                        println!("Failed to locate a SWAYSOCK from /run/user/1000/sway-ipc.*");
                        return;
                    }
                };
                println!("$SWAYSOCK is not set. Defaulting to \"{}\"", path);
                env::set_var("SWAYSOCK", path);
            }

            match Connection::new() {
                Ok(connection) => self.connection = Some(connection),
                Err(e) => println!("SwayClient#connect() failed: {}", e),
            }
        }
    }
}

impl Client for SwayClient {
    fn supported(&mut self) -> bool {
        self.connect();
        self.connection.is_some()
    }

    fn current_application(&mut self) -> Option<String> {
        self.connect();
        let connection = match &mut self.connection {
            Some(connection) => connection,
            None => return None,
        };

        if let Ok(node) = connection.get_tree() {
            if let Some(node) = node.find_focused(|n| n.focused) {
                if node.app_id.is_some() {
                    return node.app_id;
                } else if let Some(wp) = node.window_properties {
                    return wp.class;
                }
            }
        }
        None
    }
}

// e.g. "/run/user/1000/sway-ipc.1000.2575.sock"
fn find_socket() -> Option<String> {
    let uid = 1000; // Assume a first nornal Linux user. TODO: Make it configurable
    if let Some(run_user) = read_dir(format!("/run/user/{}", uid)).as_mut().ok() {
        while let Some(entry) = run_user.next() {
            let path = entry.ok()?.path();
            if let Some(fname) = path.file_name() {
                if fname.as_bytes().starts_with(b"sway-ipc.") {
                    if let Ok(path) = path.into_os_string().into_string() {
                        return Some(path);
                    }
                }
            }
        }
    }
    None
}