Readline Implementation in Rust
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Latest commit f64d526 Nov 12, 2018

README.md

RustyLine

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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_ref());
                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 = "2.1.0"

Features

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 perfoming 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 occurance of char
F Move left to the previous occurance 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 occurance of char, then one char backward
T Move left to the previous occurance 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

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Replxx C/C++ Ux/Win ANSI Yes Yes only line Emacs Yes No Ux/Win Yes
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