A readline replacement written in Rust
Basic example
// Create a default reedline object to handle user input
use reedline::{DefaultPrompt, Reedline, Signal};
fn main() {
let mut line_editor = Reedline::create()?;
let prompt = DefaultPrompt::default();
loop {
let sig = line_editor.read_line(&prompt).unwrap();
match sig {
Signal::Success(buffer) => {
println!("We processed: {}", buffer);
}
Signal::CtrlD | Signal::CtrlC => {
line_editor.print_crlf().unwrap();
break;
}
Signal::CtrlL => {
line_editor.clear_screen().unwrap();
}
}
}
}
Integrate with custom Keybindings
// Configure reedline with custom keybindings
//Cargo.toml
// [dependencies]
// crossterm = "*"
use {
crossterm::event::{KeyCode, KeyModifiers},
reedline::{default_emacs_keybindings, EditCommand, Reedline},
};
let mut keybindings = default_emacs_keybindings();
keybindings.add_binding(
KeyModifiers::ALT,
KeyCode::Char('m'),
vec![EditCommand::BackspaceWord],
);
let mut line_editor = Reedline::create()?.with_keybindings(keybindings);
Integrate with custom History
// Create a reedline object with history support, including history size limits
use reedline::{FileBackedHistory, Reedline};
let history = Box::new(
FileBackedHistory::with_file(5, "history.txt".into())
.expect("Error configuring history with file"),
);
let mut line_editor = Reedline::create()?
.with_history(history)
.expect("Error configuring reedline with history");
Integrate with custom Highlighter
// Create a reedline object with highlighter support
use reedline::{DefaultHighlighter, Reedline};
let commands = vec![
"test".into(),
"hello world".into(),
"hello world reedline".into(),
"this is the reedline crate".into(),
];
let mut line_editor =
Reedline::create()?.with_highlighter(Box::new(DefaultHighlighter::new(commands)));
Integrate with custom Tab-Handler
// Create a reedline object with tab completions support
use reedline::{DefaultCompleter, DefaultCompletionActionHandler, Reedline};
let commands = vec![
"test".into(),
"hello world".into(),
"hello world reedline".into(),
"this is the reedline crate".into(),
];
let completer = Box::new(DefaultCompleter::new_with_wordlen(commands.clone(), 2));
let mut line_editor = Reedline::create()?.with_completion_action_handler(Box::new(
DefaultCompletionActionHandler::default().with_completer(completer),
));
Integrate with custom Hinter
// Create a reedline object with in-line hint support
//Cargo.toml
// [dependencies]
// nu-ansi-term = "*"
use {
nu_ansi_term::{Color, Style},
reedline::{DefaultCompleter, DefaultHinter, Reedline},
};
let commands = vec![
"test".into(),
"hello world".into(),
"hello world reedline".into(),
"this is the reedline crate".into(),
];
let completer = Box::new(DefaultCompleter::new_with_wordlen(commands.clone(), 2));
let mut line_editor = Reedline::create()?.with_hinter(Box::new(
DefaultHinter::default()
.with_completer(completer) // or .with_history()
// .with_inside_line()
.with_style(Style::new().italic().fg(Color::LightGray)),
));
Integrate with custom Edit Mode
// Create a reedline object with custom edit mode
use reedline::{EditMode, Reedline};
let mut line_editor = Reedline::create()?.with_edit_mode(
EditMode::ViNormal, // or EditMode::Emacs or EditMode::ViInsert
);
Are we prompt yet? (Development status)
This crate is currently under active development in JT's live-coding streams. If you want to see a feature, jump by the streams, file an issue or contribute a PR!
- Basic unicode grapheme aware cursor editing.
- Configurable prompt
- Basic EMACS-style editing shortcuts.
- Configurable keybindings.
- Basic system integration with clipboard or optional stored history file.
- Content aware highlighting or validation.
- Autocompletion.
- Advanced multiline unicode aware editing.
For a more detailed roadmap check out TODO.txt.
Join the vision discussion in the vision milestone list by contributing suggestions or voting.
Alternatives
For currently more mature Rust line editing check out:
![[Add] first implementation of auto completion](https://avatars.githubusercontent.com/u/51322105?v=4)
the prompt moves upwards based on the suggestion
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