flow 0.3.5

A realtime log analyzer
Documentation 
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/**
 * Flow - Realtime log analyzer
 * Copyright (C) 2016 Daniel Mircea
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use ncurses::*;

// A negative value is interpreted as the default (original) color.
// For color pair generation, when unsigned it must also be different
// than the 8 colors already defined.
pub static COLOR_DEFAULT: i16 = -9;

pub struct ColorPair {
    pub foreground: i16,
    pub background: i16,
}

impl ColorPair {
    pub fn new(foreground: i16, background: i16) -> ColorPair {
        ColorPair {
            foreground: foreground,
            background: background,
        }
    }

    pub fn from_options(foreground: Option<i16>,
                        background: Option<i16>,
                        fallback_foreground: i16,
                        fallback_background: i16)
                        -> ColorPair {
        ColorPair::new(foreground.unwrap_or(fallback_foreground),
                       background.unwrap_or(fallback_background))
    }

    pub fn default() -> ColorPair {
        ColorPair::new(COLOR_DEFAULT, COLOR_DEFAULT)
    }

    fn calculate_id(&self) -> i16 {
        100 + self.foreground.abs() * 10 + self.background.abs()
    }

    fn init(&self) {
        init_pair(self.calculate_id(), self.foreground, self.background);
    }

    pub fn to_attr(&self) -> attr_t {
        COLOR_PAIR(self.calculate_id())
    }
}

pub fn generate_pairs() {
    let colors = [COLOR_BLACK,
                  COLOR_RED,
                  COLOR_GREEN,
                  COLOR_YELLOW,
                  COLOR_BLUE,
                  COLOR_MAGENTA,
                  COLOR_CYAN,
                  COLOR_WHITE,
                  COLOR_DEFAULT];

    for foreground in &colors {
        for background in &colors {
            ColorPair::new(*foreground, *background).init();
        }
    }
}