cir 0.1.4

//! Parse /etc/rc_maps.cfg for Linux. This file configures the default keymap
//! to load on Linux.

use std::fs::File;
use std::io::{BufRead, BufReader, Error, ErrorKind};
use std::path::Path;

/// Entry for keymap mapping
#[derive(Debug)]
pub struct KeymapTable {
    /// Name the driver to match ("*" for any)
    pub driver: String,
    /// Name of the default keymap to match ("*" for any)
    pub table: String,
    /// Path of keymap to load
    pub file: String,
}

/// Parse /etc/rc_maps.cfg
pub fn parse_rc_maps_file(path: &Path) -> Result<Vec<KeymapTable>, Error> {
    let file = File::open(path)?;
    let reader = BufReader::new(file);
    let mut res = Vec::new();

    for (line_no, line) in reader.lines().enumerate() {
        let line = line?;

        let line = line.trim_start();

        if line.is_empty() || line.starts_with('#') {
            continue;
        }

        let elements: Vec<_> = line.split_whitespace().collect();

        if elements.len() != 3 {
            return Err(Error::new(
                ErrorKind::Other,
                format!(
                    "{}:{}: error: invalid parameters",
                    path.display(),
                    line_no + 1
                ),
            ));
        }

        let driver = elements[0].to_owned();
        let table = elements[1].to_owned();
        let file = elements[2].to_owned();

        res.push(KeymapTable {
            driver,
            table,
            file,
        });
    }

    Ok(res)
}