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// Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT
use std::io::{self, Write};
use crate::{Choice, Input, Message, Password, Question, Result};
/// The fallback backend using standard input and output.
///
/// This backend is intended as a fallback backend to use if no other backend is available. The
/// dialogs are printed to the standard output and user input is read from the standard input.
#[derive(Debug)]
pub struct Stdio {}
impl Stdio {
/// Creates a new `Stdio` instance.
pub fn new() -> Stdio {
Stdio {}
}
}
impl AsRef<Stdio> for Stdio {
fn as_ref(&self) -> &Self {
self
}
}
fn print_title(title: &Option<String>) {
if let Some(ref title) = title {
println!("{}", title);
println!("{}", "=".repeat(title.len()));
}
}
fn read_input() -> Result<String> {
let mut input = String::new();
io::stdin().read_line(&mut input)?;
Ok(input.trim_end_matches("\n").to_string())
}
fn parse_choice(input: &str) -> Choice {
match input.to_lowercase().as_ref() {
"y" => Choice::Yes,
"yes" => Choice::Yes,
"n" => Choice::No,
"no" => Choice::No,
_ => Choice::Cancel,
}
}
impl super::Backend for Stdio {
fn show_input(&self, input: &Input) -> Result<Option<String>> {
print_title(&input.title);
if let Some(ref default) = input.default {
print!("{} [default: {}]: ", input.text, default);
} else {
print!("{}: ", input.text);
}
io::stdout().flush()?;
let user_input = read_input()?;
if user_input.is_empty() {
if let Some(ref default) = input.default {
return Ok(Some(default.to_string()));
}
}
Ok(Some(user_input))
}
fn show_message(&self, message: &Message) -> Result<()> {
print_title(&message.title);
println!("{}", message.text);
Ok(())
}
fn show_password(&self, password: &Password) -> Result<Option<String>> {
print_title(&password.title);
print!("{}: ", password.text);
io::stdout().flush()?;
Ok(Some(rpassword::read_password()?))
}
fn show_question(&self, question: &Question) -> Result<Choice> {
print_title(&question.title);
print!("{} [y/n]: ", question.text);
io::stdout().flush()?;
Ok(parse_choice(&read_input()?))
}
}
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