#readline

rustyline

Rustyline, a readline implementation based on Antirez’s Linenoise

15 releases (5 major breaking)

✓ Uses Rust 2018 edition

new 5.0.2 Aug 20, 2019
5.0.0 Jun 21, 2019
4.1.0 May 17, 2019
3.0.0 Dec 9, 2018
0.1.0 Sep 5, 2015

#6 in Command-line interface

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18,146 downloads per month
Used in 92 crates (84 directly)

MIT license

320KB
9K SLoC

RustyLine

Build Status Build Status dependency status Docs

Readline implementation in Rust that is based on Antirez' Linenoise

Supported Platforms

  • Unix (tested on FreeBSD, Linux and macOS)
  • Windows
    • cmd.exe
    • Powershell

Note:

  • Powershell ISE is not supported, check issue #56
  • Mintty (Cygwin/MinGW) is not supported

Example

extern crate rustyline;

use rustyline::error::ReadlineError;
use rustyline::Editor;

fn main() {
    // `()` can be used when no completer is required
    let mut rl = Editor::<()>::new();
    if rl.load_history("history.txt").is_err() {
        println!("No previous history.");
    }
    loop {
        let readline = rl.readline(">> ");
        match readline {
            Ok(line) => {
                rl.add_history_entry(line.as_str());
                println!("Line: {}", line);
            },
            Err(ReadlineError::Interrupted) => {
                println!("CTRL-C");
                break
            },
            Err(ReadlineError::Eof) => {
                println!("CTRL-D");
                break
            },
            Err(err) => {
                println!("Error: {:?}", err);
                break
            }
        }
    }
    rl.save_history("history.txt").unwrap();
}

crates.io

You can use this package in your project by adding the following to your Cargo.toml:

[dependencies]
rustyline = "5.0.2"

Features

  • Unicode (UTF-8) (linenoise supports only ASCII)
  • Word completion (linenoise supports only line completion)
  • Filename completion
  • History search (Searching for Commands in the History)
  • Kill ring (Killing Commands)
  • Multi line support (line wrapping)
  • Word commands
  • Hints

Actions

For all modes:

Keystroke Action
Home Move cursor to the beginning of line
End Move cursor to end of line
Left Move cursor one character left
Right Move cursor one character right
Ctrl-C Interrupt/Cancel edition
Ctrl-D, Del (if line is not empty) Delete character under cursor
Ctrl-D (if line is empty) End of File
Ctrl-J, Ctrl-M, Enter Finish the line entry
Ctrl-R Reverse Search history (Ctrl-S forward, Ctrl-G cancel)
Ctrl-T Transpose previous character with current character
Ctrl-U Delete from start of line to cursor
Ctrl-V Insert any special character without performing its associated action (#65)
Ctrl-W Delete word leading up to cursor (using white space as a word boundary)
Ctrl-Y Paste from Yank buffer
Ctrl-Z Suspend (Unix only)
Ctrl-_ Undo

Emacs mode (default mode)

Keystroke Action
Ctrl-A, Home Move cursor to the beginning of line
Ctrl-B, Left Move cursor one character left
Ctrl-E, End Move cursor to end of line
Ctrl-F, Right Move cursor one character right
Ctrl-H, Backspace Delete character before cursor
Ctrl-I, Tab Next completion
Ctrl-K Delete from cursor to end of line
Ctrl-L Clear screen
Ctrl-N, Down Next match from history
Ctrl-P, Up Previous match from history
Ctrl-X Ctrl-U Undo
Ctrl-Y Paste from Yank buffer (Meta-Y to paste next yank instead)
Meta-< Move to first entry in history
Meta-> Move to last entry in history
Meta-B, Alt-Left Move cursor to previous word
Meta-C Capitalize the current word
Meta-D Delete forwards one word
Meta-F, Alt-Right Move cursor to next word
Meta-L Lower-case the next word
Meta-T Transpose words
Meta-U Upper-case the next word
Meta-Y See Ctrl-Y
Meta-Backspace Kill from the start of the current word, or, if between words, to the start of the previous word
Meta-0, 1, ..., - Specify the digit to the argument. starts a negative argument.

Readline Emacs Editing Mode Cheat Sheet

vi command mode

Keystroke Action
$, End Move cursor to end of line
. Redo the last text modification
; Redo the last character finding command
, Redo the last character finding command in opposite direction
0, Home Move cursor to the beginning of line
^ Move to the first non-blank character of line
a Insert after cursor
A Insert at the end of line
b Move one word or token left
B Move one non-blank word left
c Change text of a movement command
C Change text to the end of line (equivalent to c$)
d Delete text of a movement command
D, Ctrl-K Delete to the end of the line
e Move to the end of the current word
E Move to the end of the current non-blank word
f Move right to the next occurrence of char
F Move left to the previous occurrence of char
h, Ctrl-H, Backspace Move one character left
l, Space Move one character right
Ctrl-L Clear screen
i Insert before cursor
I Insert at the beginning of line
+, j, Ctrl-N Move forward one command in history
-, k, Ctrl-P Move backward one command in history
p Insert the yanked text at the cursor (paste)
P Insert the yanked text before the cursor
r Replaces a single character under the cursor (without leaving command mode)
s Delete a single character under the cursor and enter input mode
S Change current line (equivalent to 0c$)
t Move right to the next occurrence of char, then one char backward
T Move left to the previous occurrence of char, then one char forward
u Undo
w Move one word or token right
W Move one non-blank word right
x Delete a single character under the cursor
X Delete a character before the cursor
y Yank a movement into buffer (copy)

vi insert mode

Keystroke Action
Ctrl-H, Backspace Delete character before cursor
Ctrl-I, Tab Next completion
Esc Switch to command mode

Readline vi Editing Mode Cheat Sheet

Terminal codes (ANSI/VT100)

Wine

$ cargo run --example example --target 'x86_64-pc-windows-gnu'
...
Error: Io(Error { repr: Os { code: 6, message: "Invalid handle." } })
$ wineconsole --backend=curses target/x86_64-pc-windows-gnu/debug/examples/example.exe
...

Terminal checks

$ # current settings of all terminal attributes:
$ stty -a
$ # key bindings:
$ bind -p

Similar projects

Library Lang OS Term Unicode History Completion Keymap Kill Ring Undo Colors Hint/Auto suggest
go-prompt Go Ux/win ANSI Yes Yes any Emacs/prog No No Yes Yes
Haskeline Haskell Ux/Win Any Yes Yes any Emacs/vi/conf Yes Yes ? ?
linefeed Rust Ux/Win Any Yes any Emacs/conf Yes No ? No
linenoise C Ux ANSI No Yes only line Emacs No No Ux Yes
linenoise-ng C Ux/Win ANSI Yes Yes only line Emacs Yes No ? ?
Liner Rust Ux ANSI No inc search only word Emacs/vi/prog No Yes Ux History based
prompt_toolkit Python Ux/Win ANSI Yes Yes any Emacs/vi/conf Yes Yes Ux/Win Yes
rb-readline Ruby Ux/Win ANSI Yes Yes only word Emacs/vi/conf Yes Yes ? No
replxx C/C++ Ux/Win ANSI Yes Yes only line Emacs Yes No Ux/Win Yes
Rustyline Rust Ux/Win ANSI Yes Yes any Emacs/vi/bind Yes Yes Ux/Win 10+ Yes
terminal_cli Rust Ux ANSI ? No only line ? No No ? ?

Multi line support

This is a very simple feature that simply causes lines that are longer than the current terminal width to be displayed on the next visual line instead of horizontally scrolling as more characters are typed. Currently this feature is always enabled and there is no configuration option to disable it.

This feature does not allow the end user to hit a special key sequence and enter a mode where hitting the return key will cause a literal newline to be added to the input buffer.

Dependencies

~0.6–1.1MB
~18K SLoC