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use crossterm::event::{Event, KeyCode, KeyModifiers};
use nu_engine::CallExt;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape, Value,
};
use std::io::{Read, Write};
#[derive(Clone)]
pub struct Input;
impl Command for Input {
fn name(&self) -> &str {
"input"
}
fn usage(&self) -> &str {
"Get input from the user."
}
fn search_terms(&self) -> Vec<&str> {
vec!["prompt", "interactive"]
}
fn signature(&self) -> Signature {
Signature::build("input")
.optional("prompt", SyntaxShape::String, "prompt to show the user")
.named(
"bytes-until",
SyntaxShape::String,
"read bytes (not text) until a stop byte",
Some('u'),
)
.switch("suppress-output", "don't print keystroke values", Some('s'))
.category(Category::Platform)
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
let prompt: Option<String> = call.opt(engine_state, stack, 0)?;
let bytes_until: Option<String> = call.get_flag(engine_state, stack, "bytes-until")?;
let suppress_output = call.has_flag("suppress-output");
if let Some(bytes_until) = bytes_until {
let _ = crossterm::terminal::enable_raw_mode();
if let Some(prompt) = prompt {
print!("{}", prompt);
let _ = std::io::stdout().flush();
}
if let Some(c) = bytes_until.bytes().next() {
let mut buf = [0u8; 1];
let mut buffer = vec![];
let mut stdin = std::io::stdin();
loop {
if let Err(err) = stdin.read_exact(&mut buf) {
let _ = crossterm::terminal::disable_raw_mode();
return Err(ShellError::IOError(err.to_string()));
}
buffer.push(buf[0]);
if buf[0] == c {
let _ = crossterm::terminal::disable_raw_mode();
break;
}
}
Ok(Value::Binary {
val: buffer,
span: call.head,
}
.into_pipeline_data())
} else {
let _ = crossterm::terminal::disable_raw_mode();
Err(ShellError::IOError(
"input can't stop on this byte".to_string(),
))
}
} else {
if let Some(prompt) = prompt {
print!("{}", prompt);
let _ = std::io::stdout().flush();
}
let mut buf = String::new();
if suppress_output {
crossterm::terminal::enable_raw_mode()?;
loop {
match crossterm::event::read() {
Ok(Event::Key(k)) => match k.code {
KeyCode::Char(_)
if k.modifiers == KeyModifiers::ALT
|| k.modifiers == KeyModifiers::CONTROL =>
{
continue
}
KeyCode::Char(c) => buf.push(c),
KeyCode::Backspace => {
let _ = buf.pop();
}
KeyCode::Enter => break,
_ => continue,
},
Ok(_) => continue,
Err(event_error) => {
crossterm::terminal::disable_raw_mode()?;
return Err(event_error.into());
}
}
}
crossterm::terminal::disable_raw_mode()?;
return Ok(Value::String {
val: buf,
span: call.head,
}
.into_pipeline_data());
}
let input = std::io::stdin().read_line(&mut buf);
if buf.ends_with('\n') {
buf.pop();
if buf.ends_with('\r') {
buf.pop();
}
}
match input {
Ok(_) => Ok(Value::String {
val: buf,
span: call.head,
}
.into_pipeline_data()),
Err(err) => Err(ShellError::IOError(err.to_string())),
}
}
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Get input from the user, and assign to a variable",
example: "let user-input = (input)",
result: None,
}]
}
}
#[cfg(test)]
mod tests {
use super::Input;
#[test]
fn examples_work_as_expected() {
use crate::test_examples;
test_examples(Input {})
}
}
