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use super::REPL_COMMANDS;
use crate::config::{Config, SharedConfig};
use anyhow::{Context, Result};
use nu_ansi_term::Color;
use reedline::{
default_emacs_keybindings, ColumnarMenu, DefaultCompleter, DefaultValidator, Emacs,
ExampleHighlighter, FileBackedHistory, KeyCode, KeyModifiers, Keybindings, Reedline,
ReedlineEvent, ReedlineMenu,
};
const MENU_NAME: &str = "completion_menu";
const MATCH_COLOR: Color = Color::Green;
const NEUTRAL_COLOR: Color = Color::White;
const NEUTRAL_COLOR_LIGHT: Color = Color::Black;
pub struct Repl {
pub editor: Reedline,
}
impl Repl {
pub fn init(config: SharedConfig) -> Result<Self> {
let commands: Vec<String> = REPL_COMMANDS
.into_iter()
.map(|(v, _)| v.to_string())
.collect();
let completer = Self::create_completer(config.clone(), &commands);
let highlighter = Self::create_highlighter(config, &commands);
let keybindings = Self::create_keybindings();
let history = Self::create_history()?;
let menu = Self::create_menu();
let edit_mode = Box::new(Emacs::new(keybindings));
let editor = Reedline::create()
.with_completer(Box::new(completer))
.with_highlighter(Box::new(highlighter))
.with_history(history)
.with_menu(menu)
.with_edit_mode(edit_mode)
.with_quick_completions(true)
.with_partial_completions(true)
.with_validator(Box::new(DefaultValidator))
.with_ansi_colors(true);
Ok(Self { editor })
}
fn create_completer(config: SharedConfig, commands: &[String]) -> DefaultCompleter {
let mut completion = commands.to_vec();
completion.extend(config.lock().repl_completions());
let mut completer = DefaultCompleter::with_inclusions(&['.', '-', '_']).set_min_word_len(2);
completer.insert(completion.clone());
completer
}
fn create_highlighter(config: SharedConfig, commands: &[String]) -> ExampleHighlighter {
let mut highlighter = ExampleHighlighter::new(commands.to_vec());
if config.lock().light_theme {
highlighter.change_colors(MATCH_COLOR, NEUTRAL_COLOR_LIGHT, NEUTRAL_COLOR_LIGHT);
} else {
highlighter.change_colors(MATCH_COLOR, NEUTRAL_COLOR, NEUTRAL_COLOR);
}
highlighter
}
fn create_keybindings() -> Keybindings {
let mut keybindings = default_emacs_keybindings();
keybindings.add_binding(
KeyModifiers::NONE,
KeyCode::Tab,
ReedlineEvent::UntilFound(vec![
ReedlineEvent::Menu(MENU_NAME.to_string()),
ReedlineEvent::MenuNext,
]),
);
keybindings.add_binding(
KeyModifiers::CONTROL,
KeyCode::Char('l'),
ReedlineEvent::ExecuteHostCommand(".clear screen".into()),
);
keybindings
}
fn create_menu() -> ReedlineMenu {
let completion_menu = ColumnarMenu::default().with_name(MENU_NAME);
ReedlineMenu::EngineCompleter(Box::new(completion_menu))
}
fn create_history() -> Result<Box<FileBackedHistory>> {
Ok(Box::new(
FileBackedHistory::with_file(1000, Config::history_file()?)
.with_context(|| "Failed to setup history file")?,
))
}
}
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