Add key bindings to repl.
This commit is contained in:
Stephen Chung
parent
0378c822e1
commit
06214cf499
@ -1,14 +1,12 @@
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use rustyline::error::ReadlineError;
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use rustyline::Editor;
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use rhai::{Dynamic, Engine, EvalAltResult, Module, Scope, AST, INT};
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use rustyline::config::Builder;
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use rustyline::error::ReadlineError;
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use rustyline::{Cmd, Editor, Event, EventHandler, KeyCode, KeyEvent, Modifiers, Movement};
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use smallvec::smallvec;
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use std::{
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env,
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fs::File,
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io::{stdin, stdout, Read, Write},
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path::Path,
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process::exit,
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};
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use std::{env, fs::File, io::Read, path::Path, process::exit};
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const HISTORY_FILE: &str = ".rhai-repl-history";
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/// Pretty-print error.
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fn print_error(input: &str, mut err: EvalAltResult) {
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@ -46,7 +44,9 @@ fn print_error(input: &str, mut err: EvalAltResult) {
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/// Print help text.
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fn print_help() {
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println!("help => print this help");
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println!("keys => print list of key bindings");
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println!("quit, exit => quit");
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println!("history => print lines history");
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println!("scope => print all variables in the scope");
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println!("strict => toggle on/off Strict Variables Mode");
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#[cfg(not(feature = "no_optimize"))]
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@ -57,7 +57,45 @@ fn print_help() {
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println!("json => output all functions in JSON format");
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println!("ast => print the last AST (optimized)");
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println!("astu => print the last raw, un-optimized AST");
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println!(r"end a line with '\' to continue to the next line.");
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println!();
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println!("press Shift-Enter to continue to the next line,");
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println!(r"or end a line with '\' (e.g. when pasting code).");
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println!();
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}
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/// Print key bindings.
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fn print_keys() {
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println!("Home => move to beginning of line");
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println!("Ctrl-Home => move to beginning of input");
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println!("End => move to end of line");
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println!("Ctrl-End => move to end of input");
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println!("Left => move left");
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println!("Ctrl-Left => move left by one word");
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println!("Right => move right by one word");
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println!("Ctrl-Right => move right");
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println!("Up => previous line or history");
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println!("Ctrl-Up => previous history");
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println!("Down => next line or history");
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println!("Ctrl-Down => next history");
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println!("Ctrl-R => reverse search history");
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println!(" (Ctrl-S forward, Ctrl-G cancel)");
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println!("Ctrl-L => clear screen");
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println!("Escape => clear all input");
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println!("Ctrl-C => exit");
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println!("Ctrl-D => EOF (when line empty)");
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println!("Ctrl-H, Backspace => backspace");
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println!("Ctrl-D, Del => delete character");
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println!("Ctrl-U => delete from start");
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println!("Ctrl-W => delete previous word");
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println!("Ctrl-T => transpose characters");
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println!("Ctrl-V => insert special character");
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println!("Ctrl-Y => paste yank");
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println!("Ctrl-Z => suspend (Unix), undo (Windows)");
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println!("Ctrl-_ => undo");
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println!("Enter => run code");
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println!("Shift-Ctrl-Enter => continue to next line");
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println!();
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println!("Plus all standard Emacs key bindings");
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println!();
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}
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@ -82,20 +120,10 @@ fn print_scope(scope: &Scope) {
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println!();
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}
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fn main() {
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let title = format!("Rhai REPL tool (version {})", env!("CARGO_PKG_VERSION"));
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println!("{}", title);
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println!("{0:=<1$}", "", title.len());
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#[cfg(not(feature = "no_optimize"))]
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let mut optimize_level = rhai::OptimizationLevel::Simple;
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// Initialize scripting engine
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let mut engine = Engine::new();
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// Load script files specified in the command line.
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#[cfg(not(feature = "no_module"))]
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#[cfg(not(feature = "no_std"))]
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{
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fn load_script_files(engine: &mut Engine) {
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// Load init scripts
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let mut contents = String::new();
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let mut has_init_scripts = false;
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@ -170,6 +198,90 @@ fn main() {
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}
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}
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// Setup the Rustyline editor.
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fn setup_editor() -> Editor<()> {
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let config = Builder::new()
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.tab_stop(4)
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.indent_size(4)
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.bracketed_paste(true)
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.build();
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let mut rl = Editor::<()>::with_config(config);
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// Bind more keys
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// On Windows, Esc clears the input buffer
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#[cfg(target_family = "windows")]
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::Esc, Modifiers::empty())]),
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EventHandler::Simple(Cmd::Kill(Movement::WholeBuffer)),
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);
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// On Windows, Ctrl-Z is undo
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#[cfg(target_family = "windows")]
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent::ctrl('z')]),
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EventHandler::Simple(Cmd::Undo(1)),
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);
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// Map Shift-Return to insert a new line - bypass need for `\` continuation
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(
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KeyCode::Char('m'),
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Modifiers::CTRL_SHIFT
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)]),
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EventHandler::Simple(Cmd::Newline),
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);
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(
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KeyCode::Char('j'),
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Modifiers::CTRL_SHIFT
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)]),
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EventHandler::Simple(Cmd::Newline),
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);
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::Enter, Modifiers::SHIFT)]),
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EventHandler::Simple(Cmd::Newline),
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);
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// Map Ctrl-Home and Ctrl-End for beginning/end of input
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::Home, Modifiers::CTRL)]),
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EventHandler::Simple(Cmd::Move(Movement::BeginningOfBuffer)),
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);
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::End, Modifiers::CTRL)]),
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EventHandler::Simple(Cmd::Move(Movement::EndOfBuffer)),
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);
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// Map Ctrl-Up and Ctrl-Down to skip up/down the history, even through multi-line histories
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::Down, Modifiers::CTRL)]),
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EventHandler::Simple(Cmd::NextHistory),
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);
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rl.bind_sequence(
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Event::KeySeq(smallvec![KeyEvent(KeyCode::Up, Modifiers::CTRL)]),
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EventHandler::Simple(Cmd::PreviousHistory),
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);
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// Load the history file
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if rl.load_history(HISTORY_FILE).is_err() {
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eprintln!("! No previous lines history!");
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}
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rl
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}
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fn main() {
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let title = format!("Rhai REPL tool (version {})", env!("CARGO_PKG_VERSION"));
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println!("{}", title);
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println!("{0:=<1$}", "", title.len());
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#[cfg(not(feature = "no_optimize"))]
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let mut optimize_level = rhai::OptimizationLevel::Simple;
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// Initialize scripting engine
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let mut engine = Engine::new();
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#[cfg(not(feature = "no_module"))]
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#[cfg(not(feature = "no_std"))]
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load_script_files(&mut engine);
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// Setup Engine
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#[cfg(not(feature = "no_optimize"))]
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engine.set_optimization_level(rhai::OptimizationLevel::None);
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@ -194,10 +306,7 @@ fn main() {
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let mut scope = Scope::new();
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// REPL line editor setup
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let mut rl = Editor::<()>::new();
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if rl.load_history(".rhai-repl-history.txt").is_err() {
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println!("No previous history.");
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}
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let mut rl = setup_editor();
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// REPL loop
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let mut input = String::new();
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@ -210,45 +319,35 @@ fn main() {
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'main_loop: loop {
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input.clear();
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let readline = rl.readline("rhai-repl> ");
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loop {
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let prompt = if input.is_empty() {
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"rhai-repl> "
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} else {
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" > "
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};
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match readline {
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match rl.readline(prompt) {
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// Line continuation
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Ok(line) if line.ends_with("\\") => {
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input += &line[..line.len() - 1];
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input.push('\n');
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}
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Ok(line) => {
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rl.add_history_entry(line.as_str());
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input = line;
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},
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input += line.trim_end();
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if !input.is_empty() {
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rl.add_history_entry(input.clone());
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}
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break;
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}
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Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => {
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break 'main_loop
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},
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Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => break 'main_loop,
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Err(err) => {
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eprintln!("Error: {:?}", err);
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break 'main_loop
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break 'main_loop;
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}
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}
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}
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//loop {
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// match stdin().read_line(&mut input) {
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// Ok(0) => break 'main_loop,
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// Ok(_) => (),
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// Err(err) => panic!("input error: {}", err),
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// }
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// let line = input.as_str().trim_end();
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// // Allow line continuation
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// if line.ends_with('\\') {
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// let len = line.len();
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// input.truncate(len - 1);
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// input.push('\n');
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// } else {
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// break;
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// }
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// print!("> ");
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// stdout().flush().expect("couldn't flush stdout");
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//}
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let script = input.trim();
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@ -262,7 +361,29 @@ fn main() {
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print_help();
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continue;
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}
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"keys" => {
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print_keys();
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continue;
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}
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"exit" | "quit" => break, // quit
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"history" => {
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for (i, h) in rl.history().iter().enumerate() {
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match &h.split('\n').collect::<Vec<_>>()[..] {
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[line] => println!("[{}] {}", i + 1, line),
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lines => {
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for (x, line) in lines.iter().enumerate() {
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let number = format!("[{}]", i + 1);
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if x == 0 {
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println!("{} {}", number, line.trim_end());
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} else {
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println!("{0:>1$} {2}", "", number.len(), line.trim_end());
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}
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}
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}
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}
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}
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continue;
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}
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"strict" if engine.strict_variables() => {
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engine.set_strict_variables(false);
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println!("Strict Variables Mode turned OFF.");
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@ -365,5 +486,7 @@ fn main() {
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main_ast.clear_statements();
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}
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rl.save_history(".rhai-repl-history.txt").unwrap();
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rl.save_history(HISTORY_FILE).unwrap();
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println!("Bye!");
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}
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