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// Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: MIT
use std::process;
use crate::{Choice, Error, Input, Message, Password, Question, Result};
/// The `dialog` backend.
///
/// This backend uses the external `dialog` program (not to be confused with this crate also called
/// `dialog`) to display text-based dialog boxes in the terminal.
#[derive(Debug)]
pub struct Dialog {
backtitle: Option<String>,
width: String,
height: String,
}
impl Dialog {
/// Creates a new `Dialog` instance without configuration.
pub fn new() -> Dialog {
Dialog {
backtitle: None,
height: "0".to_string(),
width: "0".to_string(),
}
}
/// Sets the backtitle for the dialog boxes.
///
/// The backtitle is displayed on the backdrop, at the top of the screen.
pub fn set_backtitle(&mut self, backtitle: impl Into<String>) {
self.backtitle = Some(backtitle.into());
}
/// Sets the height of the dialog boxes.
///
/// The height is given in characters. The actual height of the dialog box might be higher
/// than the given height if the content would not fit otherwise. The default height is zero.
pub fn set_height(&mut self, height: u32) {
self.height = height.to_string();
}
/// Sets the width of the dialog boxes.
///
/// The width is given in characters. The actual width of the dialog box might be higher than
/// the given width if the content would not fit otherwise. The default width is zero.
pub fn set_width(&mut self, width: u32) {
self.width = width.to_string();
}
fn execute(
&self,
args: Vec<&str>,
post_args: Vec<&str>,
title: &Option<String>,
) -> Result<process::Output> {
let mut command = process::Command::new("dialog");
command.stdin(process::Stdio::inherit());
command.stdout(process::Stdio::inherit());
if let Some(ref backtitle) = self.backtitle {
command.arg("--backtitle");
command.arg(backtitle);
}
if let Some(ref title) = title {
command.arg("--title");
command.arg(title);
}
command.args(args);
command.arg(&self.height);
command.arg(&self.width);
command.args(post_args);
command.output().map_err(Error::IoError)
}
}
impl AsRef<Dialog> for Dialog {
fn as_ref(&self) -> &Self {
self
}
}
fn require_success(status: process::ExitStatus) -> Result<()> {
if status.success() {
Ok(())
} else {
Err(Error::from(("dialog", status)))
}
}
fn get_choice(status: process::ExitStatus) -> Result<Choice> {
if let Some(code) = status.code() {
match code {
0 => Ok(Choice::Yes),
1 => Ok(Choice::No),
255 => Ok(Choice::Cancel),
_ => Err(Error::from(("dialog", status))),
}
} else {
Err(Error::from(("dialog", status)))
}
}
fn get_stderr(output: process::Output) -> Result<Option<String>> {
if output.status.success() {
String::from_utf8(output.stderr)
.map(|s| Some(s))
.map_err(|err| Error::from(err))
} else {
if let Some(code) = output.status.code() {
match code {
0 => Ok(None),
1 => Ok(None),
255 => Ok(None),
_ => Err(Error::from(("dialog", output.status))),
}
} else {
Err(Error::from(("dialog", output.status)))
}
}
}
impl super::Backend for Dialog {
fn show_input(&self, input: &Input) -> Result<Option<String>> {
let args = vec!["--inputbox", &input.text];
let mut post_args: Vec<&str> = Vec::new();
if let Some(ref default) = input.default {
post_args.push(default);
}
self.execute(args, post_args, &input.title)
.and_then(get_stderr)
}
fn show_message(&self, message: &Message) -> Result<()> {
let args = vec!["--msgbox", &message.text];
self.execute(args, vec![], &message.title)
.and_then(|output| require_success(output.status))
.map(|_| ())
}
fn show_password(&self, password: &Password) -> Result<Option<String>> {
let args = vec!["--passwordbox", &password.text];
self.execute(args, vec![], &password.title)
.and_then(get_stderr)
}
fn show_question(&self, question: &Question) -> Result<Choice> {
let args = vec!["--yesno", &question.text];
self.execute(args, vec![], &question.title)
.and_then(|output| get_choice(output.status))
}
}
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