use std::io::{stderr, Result, Stderr, Write};
use crossterm::{
cursor,
event::{self, KeyCode, KeyEvent, KeyModifiers},
queue,
style::{Attribute, Color, Print, SetAttribute, SetBackgroundColor, SetForegroundColor},
terminal::{self, enable_raw_mode, ClearType},
Command,
};
use crate::{
error::{InquireError, InquireResult},
ui::{Attributes, Key, Styled},
};
use super::{Terminal, INITIAL_IN_MEMORY_CAPACITY};
enum IO<'a> {
Std {
w: Stderr,
},
#[allow(unused)]
Custom {
r: &'a mut dyn Iterator<Item = &'a KeyEvent>,
w: &'a mut (dyn Write),
},
}
pub struct CrosstermTerminal<'a> {
io: IO<'a>,
in_memory_content: String,
}
impl<'a> CrosstermTerminal<'a> {
pub fn new() -> InquireResult<Self> {
enable_raw_mode().map_err(|e| match e.raw_os_error() {
Some(25) | Some(6) => InquireError::NotTTY,
_ => InquireError::from(e),
})?;
Ok(Self {
io: IO::Std { w: stderr() },
in_memory_content: String::with_capacity(INITIAL_IN_MEMORY_CAPACITY),
})
}
#[cfg(test)]
pub fn new_with_io<W: 'a + Write>(
writer: &'a mut W,
reader: &'a mut dyn Iterator<Item = &'a KeyEvent>,
) -> Self {
Self {
io: IO::Custom {
r: reader,
w: writer,
},
in_memory_content: String::with_capacity(INITIAL_IN_MEMORY_CAPACITY),
}
}
fn get_writer(&mut self) -> &mut dyn Write {
match &mut self.io {
IO::Std { w } => w,
IO::Custom { r: _, w } => w,
}
}
fn write_command<C: Command>(&mut self, command: C) -> Result<()> {
queue!(&mut self.get_writer(), command)
}
fn set_attributes(&mut self, attributes: Attributes) -> Result<()> {
if attributes.contains(Attributes::BOLD) {
self.write_command(SetAttribute(Attribute::Bold))?;
}
if attributes.contains(Attributes::ITALIC) {
self.write_command(SetAttribute(Attribute::Italic))?;
}
Ok(())
}
fn reset_attributes(&mut self) -> Result<()> {
self.write_command(SetAttribute(Attribute::Reset))
}
fn set_fg_color(&mut self, color: crate::ui::Color) -> Result<()> {
self.write_command(SetForegroundColor(color.into()))
}
fn reset_fg_color(&mut self) -> Result<()> {
self.write_command(SetForegroundColor(Color::Reset))
}
fn set_bg_color(&mut self, color: crate::ui::Color) -> Result<()> {
self.write_command(SetBackgroundColor(color.into()))
}
fn reset_bg_color(&mut self) -> Result<()> {
self.write_command(SetBackgroundColor(Color::Reset))
}
}
impl<'a> Terminal for CrosstermTerminal<'a> {
fn cursor_up(&mut self, cnt: u16) -> Result<()> {
self.write_command(cursor::MoveUp(cnt))
}
fn cursor_down(&mut self, cnt: u16) -> Result<()> {
self.write_command(cursor::MoveDown(cnt))
}
fn cursor_move_to_column(&mut self, idx: u16) -> Result<()> {
self.write_command(cursor::MoveToColumn(idx))
}
fn read_key(&mut self) -> Result<Key> {
loop {
match &mut self.io {
IO::Std { w: _ } => {
if let event::Event::Key(key_event) = event::read()? {
return Ok(key_event.into());
}
}
IO::Custom { r, w: _ } => {
let key = r.next().expect("Custom stream of characters has ended");
return Ok((*key).into());
}
}
}
}
fn flush(&mut self) -> Result<()> {
self.get_writer().flush()
}
fn get_size(&self) -> Result<super::TerminalSize> {
terminal::size().map(|(width, height)| super::TerminalSize { width, height })
}
fn write<T: std::fmt::Display>(&mut self, val: T) -> Result<()> {
let formatted = format!("{val}");
let converted = newline_converter::unix2dos(&formatted);
self.in_memory_content.push_str(converted.as_ref());
self.write_command(Print(converted))
}
fn write_styled<T: std::fmt::Display>(&mut self, val: &Styled<T>) -> Result<()> {
if let Some(color) = val.style.fg {
self.set_fg_color(color)?;
}
if let Some(color) = val.style.bg {
self.set_bg_color(color)?;
}
if !val.style.att.is_empty() {
self.set_attributes(val.style.att)?;
}
self.write(&val.content)?;
if val.style.fg.as_ref().is_some() {
self.reset_fg_color()?;
}
if val.style.bg.as_ref().is_some() {
self.reset_bg_color()?;
}
if !val.style.att.is_empty() {
self.reset_attributes()?;
}
Ok(())
}
fn clear_current_line(&mut self) -> Result<()> {
self.write_command(terminal::Clear(ClearType::CurrentLine))
}
fn cursor_hide(&mut self) -> Result<()> {
self.write_command(cursor::Hide)
}
fn cursor_show(&mut self) -> Result<()> {
self.write_command(cursor::Show)
}
fn get_in_memory_content(&self) -> &str {
self.in_memory_content.as_ref()
}
fn clear_in_memory_content(&mut self) {
self.in_memory_content.clear()
}
}
impl<'a> Drop for CrosstermTerminal<'a> {
fn drop(&mut self) {
let _ = self.flush();
let _ = match self.io {
IO::Std { w: _ } => terminal::disable_raw_mode(),
IO::Custom { r: _, w: _ } => Ok(()),
};
}
}
impl From<crate::ui::Color> for Color {
fn from(c: crate::ui::Color) -> Self {
use crate::ui::Color as C;
match c {
C::Black => Color::Black,
C::LightRed => Color::Red,
C::DarkRed => Color::DarkRed,
C::LightGreen => Color::Green,
C::DarkGreen => Color::DarkGreen,
C::LightYellow => Color::Yellow,
C::DarkYellow => Color::DarkYellow,
C::LightBlue => Color::Blue,
C::DarkBlue => Color::DarkBlue,
C::LightMagenta => Color::Magenta,
C::DarkMagenta => Color::DarkMagenta,
C::LightCyan => Color::Cyan,
C::DarkCyan => Color::DarkCyan,
C::White => Color::White,
C::Grey => Color::Grey,
C::DarkGrey => Color::DarkGrey,
C::Rgb { r, g, b } => Color::Rgb { r, g, b },
C::AnsiValue(b) => Color::AnsiValue(b),
}
}
}
impl From<KeyModifiers> for crate::ui::KeyModifiers {
fn from(m: KeyModifiers) -> Self {
let mut modifiers = Self::empty();
if m.contains(KeyModifiers::NONE) {
modifiers |= crate::ui::KeyModifiers::NONE;
}
if m.contains(KeyModifiers::ALT) {
modifiers |= crate::ui::KeyModifiers::ALT;
}
if m.contains(KeyModifiers::CONTROL) {
modifiers |= crate::ui::KeyModifiers::CONTROL;
}
if m.contains(KeyModifiers::SHIFT) {
modifiers |= crate::ui::KeyModifiers::SHIFT;
}
modifiers
}
}
impl From<KeyEvent> for Key {
fn from(event: KeyEvent) -> Self {
match event {
KeyEvent {
code: KeyCode::Char('c'),
modifiers: crossterm::event::KeyModifiers::CONTROL,
..
} => Self::Interrupt,
KeyEvent {
code: KeyCode::Esc, ..
} => Self::Cancel,
KeyEvent {
code: KeyCode::Enter,
..
}
| KeyEvent {
code: KeyCode::Char('\n'),
..
}
| KeyEvent {
code: KeyCode::Char('\r'),
..
} => Self::Submit,
KeyEvent {
code: KeyCode::Tab, ..
}
| KeyEvent {
code: KeyCode::Char('\t'),
..
} => Self::Tab,
KeyEvent {
code: KeyCode::Backspace,
..
} => Self::Backspace,
KeyEvent {
code: KeyCode::Delete,
modifiers: m,
..
} => Self::Delete(m.into()),
KeyEvent {
code: KeyCode::Home,
..
} => Self::Home,
KeyEvent {
code: KeyCode::End, ..
} => Self::End,
KeyEvent {
code: KeyCode::PageUp,
..
} => Self::PageUp,
KeyEvent {
code: KeyCode::PageDown,
..
} => Self::PageDown,
KeyEvent {
code: KeyCode::Up,
modifiers: m,
..
} => Self::Up(m.into()),
KeyEvent {
code: KeyCode::Down,
modifiers: m,
..
} => Self::Down(m.into()),
KeyEvent {
code: KeyCode::Left,
modifiers: m,
..
} => Self::Left(m.into()),
KeyEvent {
code: KeyCode::Right,
modifiers: m,
..
} => Self::Right(m.into()),
KeyEvent {
code: KeyCode::Char(c),
modifiers: m,
..
} => Self::Char(c, m.into()),
#[allow(deprecated)]
_ => Self::Any,
}
}
}
#[cfg(test)]
mod test {
use crate::terminal::Terminal;
use crate::ui::Color;
use super::Attributes;
use super::CrosstermTerminal;
#[test]
fn writer() {
let mut write: Vec<u8> = Vec::new();
let read = Vec::new();
let mut read = read.iter();
{
let mut terminal = CrosstermTerminal::new_with_io(&mut write, &mut read);
terminal.write("testing ").unwrap();
terminal.write("writing ").unwrap();
terminal.flush().unwrap();
terminal.write("wow").unwrap();
}
#[cfg(unix)]
assert_eq!("testing writing wow", std::str::from_utf8(&write).unwrap());
}
#[test]
fn style_management() {
let mut write: Vec<u8> = Vec::new();
let read = Vec::new();
let mut read = read.iter();
{
let mut terminal = CrosstermTerminal::new_with_io(&mut write, &mut read);
terminal.set_attributes(Attributes::BOLD).unwrap();
terminal.set_attributes(Attributes::ITALIC).unwrap();
terminal.set_attributes(Attributes::BOLD).unwrap();
terminal.reset_attributes().unwrap();
}
#[cfg(unix)]
assert_eq!(
"\x1B[1m\x1B[3m\x1B[1m\x1B[0m",
std::str::from_utf8(&write).unwrap()
);
}
#[test]
fn style_management_with_flags() {
let mut write: Vec<u8> = Vec::new();
let read = Vec::new();
let mut read = read.iter();
{
let mut terminal = CrosstermTerminal::new_with_io(&mut write, &mut read);
terminal
.set_attributes(Attributes::BOLD | Attributes::ITALIC | Attributes::BOLD)
.unwrap();
terminal.reset_attributes().unwrap();
}
#[cfg(unix)]
assert_eq!(
"\x1B[1m\x1B[3m\x1B[0m",
std::str::from_utf8(&write).unwrap()
);
}
#[test]
fn fg_color_management() {
let mut write: Vec<u8> = Vec::new();
let read = Vec::new();
let mut read = read.iter();
{
let mut terminal = CrosstermTerminal::new_with_io(&mut write, &mut read);
terminal.set_fg_color(Color::LightRed).unwrap();
terminal.reset_fg_color().unwrap();
terminal.set_fg_color(Color::Black).unwrap();
terminal.set_fg_color(Color::LightGreen).unwrap();
}
#[cfg(unix)]
assert_eq!(
"\x1B[38;5;9m\x1B[39m\x1B[38;5;0m\x1B[38;5;10m",
std::str::from_utf8(&write).unwrap()
);
}
#[test]
fn bg_color_management() {
let mut write: Vec<u8> = Vec::new();
let read = Vec::new();
let mut read = read.iter();
{
let mut terminal = CrosstermTerminal::new_with_io(&mut write, &mut read);
terminal.set_bg_color(Color::LightRed).unwrap();
terminal.reset_bg_color().unwrap();
terminal.set_bg_color(Color::Black).unwrap();
terminal.set_bg_color(Color::LightGreen).unwrap();
}
#[cfg(unix)]
assert_eq!(
"\x1B[48;5;9m\x1B[49m\x1B[48;5;0m\x1B[48;5;10m",
std::str::from_utf8(&write).unwrap()
);
}
}