flow/ui/
event.rs

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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 ui::input::*;
use ui::readline;
use ui::navigation::State as NavigationState;

pub enum Direction {
    Left,
    Right,
}

#[derive(Clone, Hash, PartialEq, Eq)]
pub enum SearchAction {
    ReadInput(Vec<i32>),
    ToggleFilterMode,
    FindNextMatch,
    FindPreviousMatch,
}

pub enum Offset {
    Line(i32),
    Viewport(i32),
    Top,
    Bottom,
}

pub enum Event {
    ScrollContents(Offset),
    SelectMenuItem(Direction),
    Navigation(NavigationState),
    Search(SearchAction),
    Resize,
    Quit,
    Other,
}

#[derive(Clone, Hash, PartialEq, Eq)]
pub enum QueuedEvent {
    Unhighlight(SearchAction),
    PerformSearch,
}

pub struct EventBuilder {
    input: Input,
    key: i32,
}

impl EventBuilder {
    pub fn new(input: Input, key: i32) -> EventBuilder {
        EventBuilder {
            input: input,
            key: key,
        }
    }

    pub fn construct(&self, current_navigation_state: &NavigationState) -> Event {
        let mut result = self.create_global_event();

        if result.is_none() {
            result = match *current_navigation_state {
                NavigationState::Menu => self.create_menu_event(),
                NavigationState::Search => self.create_search_event(),
            };
        }
        result.unwrap_or(Event::Other)
    }

    fn create_menu_event(&self) -> Option<Event> {
        match self.input {
            Input::Kb(Key::Left, None) => Some(Event::SelectMenuItem(Direction::Left)),
            Input::Kb(Key::Right, None) => Some(Event::SelectMenuItem(Direction::Right)),
            Input::Kb(Key::Char('/'), None) |
            Input::Kb(Key::Char('F'), Some(Modifier::Ctrl)) => {
                Some(Event::Navigation(NavigationState::Search))
            }
            Input::Kb(Key::Char('q'), None) => Some(Event::Quit),
            _ => None,
        }
    }

    fn create_search_event(&self) -> Option<Event> {
        match self.input {
            Input::Kb(Key::Char('n'), Some(Modifier::Alt(_))) => {
                Some(Event::Search(SearchAction::FindNextMatch))
            }
            Input::Kb(Key::Char('p'), Some(Modifier::Alt(_))) => {
                Some(Event::Search(SearchAction::FindPreviousMatch))
            }
            Input::Kb(Key::Char('m'), Some(Modifier::Alt(_))) => {
                Some(Event::Search(SearchAction::ToggleFilterMode))
            }
            Input::Kb(Key::Escape, None) if !readline::is_history() => {
                Some(Event::Navigation(NavigationState::Menu))
            }
            _ => self.create_input_event(),
        }
    }

    fn create_global_event(&self) -> Option<Event> {
        match self.input {
            Input::Kb(Key::Up, None) => Some(Event::ScrollContents(Offset::Line(1))),
            Input::Kb(Key::Down, None) => Some(Event::ScrollContents(Offset::Line(-1))),
            Input::Kb(Key::PageUp, None) => Some(Event::ScrollContents(Offset::Viewport(1))),
            Input::Kb(Key::PageDown, None) => Some(Event::ScrollContents(Offset::Viewport(-1))),
            Input::Kb(Key::Home, None) => Some(Event::ScrollContents(Offset::Top)),
            Input::Kb(Key::End, None) => Some(Event::ScrollContents(Offset::Bottom)),
            Input::Resize => Some(Event::Resize),
            _ => None,
        }
    }

    fn create_input_event(&self) -> Option<Event> {
        match self.input {
            Input::Kb(Key::Left, None) => {
                Some(Event::Search(SearchAction::ReadInput(KEY_LEFT_SEQ.to_vec())))
            }
            Input::Kb(Key::Right, None) => {
                Some(Event::Search(SearchAction::ReadInput(KEY_RIGHT_SEQ.to_vec())))
            }
            Input::Kb(Key::Home, None) => {
                Some(Event::Search(SearchAction::ReadInput(KEY_HOME_SEQ.to_vec())))
            }
            Input::Kb(Key::End, None) => {
                Some(Event::Search(SearchAction::ReadInput(KEY_END_SEQ.to_vec())))
            }
            Input::Kb(Key::Delete, None) => {
                let mut keys = KEY_RIGHT_SEQ.to_vec();
                keys.extend(KEY_BACKSPACE_SEQ.to_vec());
                Some(Event::Search(SearchAction::ReadInput(keys)))
            }
            Input::Kb(Key::Backspace, None) => {
                Some(Event::Search(SearchAction::ReadInput(KEY_BACKSPACE_SEQ.to_vec())))
            }
            Input::Kb(_, ref modifier) => {
                let mut keys = vec![self.key];
                if let Some(Modifier::Alt(value)) = *modifier {
                    keys.push(value)
                };
                Some(Event::Search(SearchAction::ReadInput(keys)))
            }
            _ => None,
        }
    }
}