crashdump_viewer_cli 0.2.0

A CLI tool to parse Erlang crashdumps.
Documentation 
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// Copyright (c) Meta Platforms, Inc. and affiliates.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::app::{App, AppResult, ProcessViewState, SelectedTab};
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_tab {
        SelectedTab::Inspect => {
            match key_event.code {
                // Exit application on `ESC` or `q`
                KeyCode::Esc | KeyCode::Char('q') => {
                    app.quit();
                }
                // Exit application on `Ctrl-C`
                KeyCode::Char('c') | KeyCode::Char('C') => {
                    if key_event.modifiers == KeyModifiers::CONTROL {
                        app.quit();
                    }
                }

                KeyCode::Char('i') | KeyCode::Char('I') => {
                    app.selected_tab = SelectedTab::Process;
                }

                KeyCode::Right => app.next_tab(),
                KeyCode::Left => app.prev_tab(),
        
                KeyCode::Char('j') | KeyCode::Down => app.inspect_scroll_state.scroll_down(),
                KeyCode::Char('k') | KeyCode::Up => app.inspect_scroll_state.scroll_up(),
                KeyCode::Char('f') | KeyCode::PageDown => app.inspect_scroll_state.scroll_page_down(),
                KeyCode::Char('b') | KeyCode::PageUp => app.inspect_scroll_state.scroll_page_up(),
                KeyCode::Char('g') | KeyCode::Home => app.inspect_scroll_state.scroll_to_top(),
                KeyCode::Char('G') | KeyCode::End => app.inspect_scroll_state.scroll_to_bottom(),

                _ => {}
            }
        }
        _ => {
            match key_event.code {
                // Exit application on `ESC` or `q`
                KeyCode::Esc | KeyCode::Char('q') => {
                    app.quit();
                }
                // Exit application on `Ctrl-C`
                KeyCode::Char('c') | KeyCode::Char('C') => {
                    if key_event.modifiers == KeyModifiers::CONTROL {
                        app.quit();
                    }
                }
                // Tab switching
                KeyCode::Right => app.next_tab(),
                KeyCode::Left => app.prev_tab(),
        
                KeyCode::Down => {
                    if let Some(table_state) = app.table_states.get_mut(&app.selected_tab) {
                        if let Some(selected) = table_state.selected() {
                            let amount_items = app.tab_lists[&app.selected_tab].len();
                            if selected >= amount_items - 1 {
                                table_state.select(Some(0));
                            } else {
                                table_state.select(Some(selected + 1));
                            }
                        }
                    }
                }
        
                KeyCode::Char('s') | KeyCode::Char('S') => {
                    if app.selected_tab == SelectedTab::Process {
                        app.process_view_state = ProcessViewState::Stack;
                    }
                }
        
                KeyCode::Char('h') | KeyCode::Char('H') => {
                    if app.selected_tab == SelectedTab::Process {
                        app.process_view_state = ProcessViewState::Heap;
                    }
                }
        
                KeyCode::Char('m') | KeyCode::Char('M') => {
                    if app.selected_tab == SelectedTab::Process {
                        app.process_view_state = ProcessViewState::MessageQueue;
                    }
                }

                KeyCode::Char('i') | KeyCode::Char('I') => {
                    if app.selected_tab == SelectedTab::Process {
                        app.selected_tab = SelectedTab::Inspect;
                    }
                }
        
                KeyCode::Up => {
                    if let Some(table_state) = app.table_states.get_mut(&app.selected_tab) {
                        if let Some(selected) = table_state.selected() {
                            let amount_items = app.tab_lists[&app.selected_tab].len();
                            if selected > 0 {
                                table_state.select(Some(selected - 1));
                            } else {
                                table_state.select(Some(amount_items - 1));
                            }
                        }
                    }
                }
                
                _ => {}
                
            }
        }
    }
    
    Ok(())
}