demo.rs

use std::env::temp_dir;
use std::process::Command;
use {
    crossterm::{
        cursor::SetCursorStyle,
        event::{KeyCode, KeyModifiers},
    },
    nu_ansi_term::{Color, Style},
    reedline::{
        default_emacs_keybindings, default_vi_insert_keybindings, default_vi_normal_keybindings,
        ColumnarMenu, DefaultCompleter, DefaultHinter, DefaultPrompt, DefaultValidator,
        EditCommand, EditMode, Emacs, ExampleHighlighter, Keybindings, ListMenu, Reedline,
        ReedlineEvent, ReedlineMenu, Signal, Vi,
    },
};

#[cfg(not(any(feature = "sqlite", feature = "sqlite-dynlib")))]
use reedline::FileBackedHistory;
use reedline::{CursorConfig, MenuBuilder};

fn main() -> reedline::Result<()> {
    println!("Ctrl-D to quit");
    // quick command like parameter handling
    let vi_mode = matches!(std::env::args().nth(1), Some(x) if x == "--vi");

    // Setting history_per_session to true will allow the history to be isolated to the current session
    // Setting history_per_session to false will allow the history to be shared across all sessions
    let history_per_session = true;
    let mut history_session_id = if history_per_session {
        Reedline::create_history_session_id()
    } else {
        None
    };

    #[cfg(any(feature = "sqlite", feature = "sqlite-dynlib"))]
    let history = Box::new(
        reedline::SqliteBackedHistory::with_file(
            "history.sqlite3".into(),
            history_session_id,
            Some(chrono::Utc::now()),
        )
        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?,
    );
    #[cfg(not(any(feature = "sqlite", feature = "sqlite-dynlib")))]
    let history = Box::new(FileBackedHistory::with_file(50, "history.txt".into())?);
    let commands = vec![
        "test".into(),
        "clear".into(),
        "exit".into(),
        "history 1".into(),
        "history 2".into(),
        "history 3".into(),
        "history 4".into(),
        "history 5".into(),
        "logout".into(),
        "login".into(),
        "hello world".into(),
        "hello world reedline".into(),
        "hello world something".into(),
        "hello world another".into(),
        "hello world 1".into(),
        "hello world 2".into(),
        "hello world 3".into(),
        "hello world 4".into(),
        "hello another very large option for hello word that will force one column".into(),
        "this is the reedline crate".into(),
        "abaaacas".into(),
        "abaaac".into(),
        "abaaaxyc".into(),
        "abaaarabc".into(),
        "こんにちは世界".into(),
        "こんばんは世界".into(),
    ];
    let completer = Box::new(DefaultCompleter::new_with_wordlen(commands.clone(), 2));

    let cursor_config = CursorConfig {
        vi_insert: Some(SetCursorStyle::BlinkingBar),
        vi_normal: Some(SetCursorStyle::SteadyBlock),
        emacs: None,
    };

    let mut line_editor = Reedline::create()
        .with_history_session_id(history_session_id)
        .with_history(history)
        .with_history_exclusion_prefix(Some(" ".to_string()))
        .with_completer(completer)
        .with_quick_completions(true)
        .with_partial_completions(true)
        .with_cursor_config(cursor_config)
        .use_bracketed_paste(true)
        .use_kitty_keyboard_enhancement(true)
        .with_highlighter(Box::new(ExampleHighlighter::new(commands)))
        .with_hinter(Box::new(
            DefaultHinter::default().with_style(Style::new().fg(Color::DarkGray)),
        ))
        .with_validator(Box::new(DefaultValidator))
        .with_ansi_colors(true);

    // Adding default menus for the compiled reedline
    line_editor = line_editor
        .with_menu(ReedlineMenu::EngineCompleter(Box::new(
            ColumnarMenu::default().with_name("completion_menu"),
        )))
        .with_menu(ReedlineMenu::HistoryMenu(Box::new(
            ListMenu::default().with_name("history_menu"),
        )));

    let edit_mode: Box<dyn EditMode> = if vi_mode {
        let mut normal_keybindings = default_vi_normal_keybindings();
        let mut insert_keybindings = default_vi_insert_keybindings();

        add_menu_keybindings(&mut normal_keybindings);
        add_menu_keybindings(&mut insert_keybindings);

        add_newline_keybinding(&mut insert_keybindings);

        Box::new(Vi::new(insert_keybindings, normal_keybindings))
    } else {
        let mut keybindings = default_emacs_keybindings();
        add_menu_keybindings(&mut keybindings);
        add_newline_keybinding(&mut keybindings);

        Box::new(Emacs::new(keybindings))
    };

    line_editor = line_editor.with_edit_mode(edit_mode);

    // Adding vi as text editor
    let temp_file = temp_dir().join("temp_file.nu");
    let mut command = Command::new("vi");
    command.arg(&temp_file);
    line_editor = line_editor.with_buffer_editor(command, temp_file);

    let prompt = DefaultPrompt::default();

    loop {
        let sig = line_editor.read_line(&prompt);

        match sig {
            Ok(Signal::CtrlD) => {
                break;
            }
            Ok(Signal::Success(buffer)) => {
                #[cfg(any(feature = "sqlite", feature = "sqlite-dynlib"))]
                let start = std::time::Instant::now();
                // save timestamp, cwd, hostname to history
                #[cfg(any(feature = "sqlite", feature = "sqlite-dynlib"))]
                if !buffer.is_empty() {
                    line_editor
                        .update_last_command_context(&|mut c: reedline::HistoryItem| {
                            c.start_timestamp = Some(chrono::Utc::now());
                            c.hostname =
                                Some(gethostname::gethostname().to_string_lossy().to_string());
                            c.cwd = std::env::current_dir()
                                .ok()
                                .map(|e| e.to_string_lossy().to_string());
                            c
                        })
                        .expect("todo: error handling");
                }
                if (buffer.trim() == "exit") || (buffer.trim() == "logout") {
                    break;
                }
                if buffer.trim() == "clear" {
                    line_editor.clear_scrollback()?;
                    continue;
                }
                // Get the full history
                if buffer.trim() == "history" {
                    line_editor.print_history()?;
                    continue;
                }
                // Get the history only pertinent to the current session
                if buffer.trim() == "history session" {
                    line_editor.print_history_session()?;
                    continue;
                }
                // Get this history session identifier
                if buffer.trim() == "history sessionid" {
                    line_editor.print_history_session_id()?;
                    continue;
                }
                // Toggle between the full history and the history pertinent to the current session
                if buffer.trim() == "toggle history_session" {
                    let hist_session_id = if history_session_id.is_none() {
                        // If we never created a history session ID, create one now
                        let sesh = Reedline::create_history_session_id();
                        history_session_id = sesh;
                        sesh
                    } else {
                        history_session_id
                    };
                    line_editor.toggle_history_session_matching(hist_session_id)?;
                    continue;
                }
                if buffer.trim() == "clear-history" {
                    let hstry = Box::new(line_editor.history_mut());
                    hstry
                        .clear()
                        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
                    continue;
                }
                println!("Our buffer: {buffer}");
                #[cfg(any(feature = "sqlite", feature = "sqlite-dynlib"))]
                if !buffer.is_empty() {
                    line_editor
                        .update_last_command_context(&|mut c| {
                            c.duration = Some(start.elapsed());
                            c.exit_status = Some(0);
                            c
                        })
                        .expect("todo: error handling");
                }
            }
            Ok(Signal::CtrlC) => {
                // Prompt has been cleared and should start on the next line
            }
            Err(err) => {
                println!("Error: {err:?}");
            }
        }
    }

    println!();
    Ok(())
}

fn add_menu_keybindings(keybindings: &mut Keybindings) {
    keybindings.add_binding(
        KeyModifiers::CONTROL,
        KeyCode::Char('x'),
        ReedlineEvent::UntilFound(vec![
            ReedlineEvent::Menu("history_menu".to_string()),
            ReedlineEvent::MenuPageNext,
        ]),
    );

    keybindings.add_binding(
        KeyModifiers::CONTROL | KeyModifiers::SHIFT,
        KeyCode::Char('x'),
        ReedlineEvent::MenuPagePrevious,
    );

    keybindings.add_binding(
        KeyModifiers::NONE,
        KeyCode::Tab,
        ReedlineEvent::UntilFound(vec![
            ReedlineEvent::Menu("completion_menu".to_string()),
            ReedlineEvent::Edit(vec![EditCommand::Complete]),
        ]),
    );

    keybindings.add_binding(
        KeyModifiers::SHIFT,
        KeyCode::BackTab,
        ReedlineEvent::MenuPrevious,
    );
}

fn add_newline_keybinding(keybindings: &mut Keybindings) {
    // This doesn't work for macOS
    keybindings.add_binding(
        KeyModifiers::ALT,
        KeyCode::Enter,
        ReedlineEvent::Edit(vec![EditCommand::InsertNewline]),
    );
}