dyd 0.5.0

CLI for daily diffing of git repos
Documentation 
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use crate::app::{App, AppResult, SelectedModal, SelectedPane};
use crate::git;
use crate::widget::calendar::CalendarState;
use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};

/// Handles the key events and updates the state of [`App`].
pub fn handle_key_events(key_event: KeyEvent, app: &mut App) -> AppResult<()> {
    match (&app.selected_pane, &app.modal, key_event.code) {
        // Calendar selection widget
        (_, SelectedModal::Calendar, KeyCode::Up | KeyCode::Char('k')) => decrement_calendar_week(app),
        (_, SelectedModal::Calendar, KeyCode::Down | KeyCode::Char('j')) => increment_calendar_week(app),
        (_, SelectedModal::Calendar, KeyCode::Left | KeyCode::Char('h')) => decrement_calendar_day(app),
        (_, SelectedModal::Calendar, KeyCode::Right | KeyCode::Char('l')) => increment_calendar_day(app),
        (_, SelectedModal::Calendar, KeyCode::Enter) => {
            select_calendar_day(app);
            close_modal(app);
        }

        // Scroll through lists
        (SelectedPane::Diff, _, KeyCode::Up | KeyCode::Char('k')) => decrement_selected_log(app, 1),
        (SelectedPane::Diff, _, KeyCode::Down | KeyCode::Char('j')) => increment_selected_log(app, 1),
        (SelectedPane::Diff, _, KeyCode::Char(' ') | KeyCode::Char('f')) => increment_selected_log(app, 10),
        (SelectedPane::Diff, _, KeyCode::Char('b')) => decrement_selected_log(app, 10),

        (SelectedPane::Repos, _, KeyCode::Up | KeyCode::Char('k')) => decrement_repos(app, 1),
        (SelectedPane::Repos, _, KeyCode::Down | KeyCode::Char('j')) => increment_repos(app, 1),
        (SelectedPane::Repos, _, KeyCode::Char(' ') | KeyCode::Char('f')) => increment_repos(app, 10),
        (SelectedPane::Repos, _, KeyCode::Char('b')) => decrement_repos(app, 10),

        // navigate pane
        (SelectedPane::Diff, _, KeyCode::Left | KeyCode::Char('h')) => (),
        (SelectedPane::Repos, _, KeyCode::Left | KeyCode::Char('h')) => app.selected_pane = SelectedPane::Diff,
        (SelectedPane::Diff, _, KeyCode::Right | KeyCode::Char('l')) => app.selected_pane = SelectedPane::Repos,
        (SelectedPane::Diff, _, KeyCode::Tab) => app.selected_pane = SelectedPane::Repos,
        (SelectedPane::Repos, _, KeyCode::Tab) => app.selected_pane = SelectedPane::Diff,

        // open diff
        (SelectedPane::Diff, _, KeyCode::Char('d')) => open_git_difftool(app),

        // exit application on ESC, q, or Ctrl-D
        (_, SelectedModal::None, KeyCode::Esc) => app.running = false,
        (_, _, KeyCode::Char('q') | KeyCode::Char('Q')) => app.running = false,
        (_, _, KeyCode::Char('d') | KeyCode::Char('D')) => {
            if key_event.modifiers == KeyModifiers::CONTROL {
                app.running = false;
            }
        }

        // modal management
        (_, _, KeyCode::Char('s')) => {
            if app.modal == SelectedModal::Calendar {
                close_modal(app)
            } else {
                app.calendar_state = CalendarState::from_datetime(&app.since);
                open_modal(app, SelectedModal::Calendar)
            }
        }
        (_, _, KeyCode::Esc) => close_modal(app),
        _ => {}
    }
    Ok(())
}

// // // Panes

fn decrement_selected_log(app: &mut App, count: usize) {
    if let Some(current) = app.selected_repo_state.selected() {
        if let Some(next_line) = current.checked_sub(count) {
            app.selected_repo_state.select(Some(next_line))
        } else {
            app.selected_repo_state.select(Some(0))
        };
    }
}

fn increment_selected_log(app: &mut App, count: usize) {
    let selected_repo_index = app.repo_state.selected().unwrap();
    let (_id, selected_repo) = app.repos.get_index(selected_repo_index).unwrap();

    let max_log: usize = selected_repo.logs.len() - 1;

    if let Some(current) = app.selected_repo_state.selected() {
        let next = std::cmp::min(current + count, max_log);
        app.selected_repo_state.select(Some(next));
    }
}

fn decrement_repos(app: &mut App, count: usize) {
    app.selected_repo_state.select(Some(0));
    if let Some(current) = app.repo_state.selected() {
        if let Some(next) = current.checked_sub(count) {
            app.repo_state.select(Some(next))
        } else {
            app.repo_state.select(Some(0))
        };
    }
}

fn increment_repos(app: &mut App, count: usize) {
    app.selected_repo_state.select(Some(0));
    let max_repos: usize = app.repos.len() - 1;
    if let Some(current) = app.repo_state.selected() {
        let next = std::cmp::min(current + count, max_repos);
        app.repo_state.select(Some(next));
    }
}

// // // Calendar

fn decrement_calendar_day(app: &mut App) {
    app.calendar_state.decrement(1);
}

fn decrement_calendar_week(app: &mut App) {
    app.calendar_state.decrement(7);
}

fn increment_calendar_day(app: &mut App) {
    app.calendar_state.increment(1);
}

fn increment_calendar_week(app: &mut App) {
    app.calendar_state.increment(7);
}

fn select_calendar_day(app: &mut App) {
    app.since = app.calendar_state.to_utc_datetime();
}

// // // Modals

fn open_modal(app: &mut App, modal: SelectedModal) {
    app.modal = modal;
}

fn close_modal(app: &mut App) {
    app.modal = SelectedModal::None;
}

// // // Diff

fn open_git_difftool(app: &App) {
    let selected_repo_index = app.repo_state.selected().unwrap();
    let (_id, selected_repo) = app.repos.get_index(selected_repo_index).unwrap();
    let selected_log = app.selected_repo_state.selected().unwrap();
    let log = &selected_repo.logs[selected_log];

    git::open_difftool(&app.root_path, &app.difftool, selected_repo, log);
}