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|
use std::io::{stdout, BufWriter, Stdout, Write};
use crossterm::{
cursor::{Hide, MoveTo, MoveToColumn, MoveToNextLine, Show},
event::{
DisableMouseCapture,
EnableMouseCapture,
KeyboardEnhancementFlags,
PopKeyboardEnhancementFlags,
PushKeyboardEnhancementFlags,
},
style::{available_color_count, Attribute, Colors, Print, ResetColor, SetAttribute, SetColors},
terminal::{
disable_raw_mode,
enable_raw_mode,
size,
Clear,
ClearType,
DisableLineWrap,
EnableLineWrap,
EnterAlternateScreen,
LeaveAlternateScreen,
},
Command,
QueueableCommand,
};
use crate::display::{color_mode::ColorMode, error::DisplayError, size::Size, tui::Tui, utils::detect_color_mode};
/// A thin wrapper over the [Crossterm library](https://github.com/crossterm-rs/crossterm).
#[derive(Debug)]
pub(crate) struct CrossTerm {
color_mode: ColorMode,
window: BufWriter<Stdout>,
}
impl Tui for CrossTerm {
#[inline]
fn get_color_mode(&self) -> ColorMode {
self.color_mode
}
#[inline]
fn reset(&mut self) -> Result<(), DisplayError> {
self.queue_command(ResetColor)?;
self.queue_command(SetAttribute(Attribute::Reset))?;
self.queue_command(Clear(ClearType::All))?;
self.queue_command(MoveTo(0, 0))
}
#[inline]
fn flush(&mut self) -> Result<(), DisplayError> {
self.window.flush().map_err(DisplayError::Unexpected)
}
#[inline]
fn print(&mut self, s: &str) -> Result<(), DisplayError> {
self.queue_command(Print(s))
}
#[inline]
fn set_color(&mut self, colors: Colors) -> Result<(), DisplayError> {
self.queue_command(SetColors(colors))
}
#[inline]
fn set_dim(&mut self, dim: bool) -> Result<(), DisplayError> {
self.queue_command(SetAttribute(
if dim {
Attribute::Dim
}
else {
Attribute::NormalIntensity
},
))
}
#[inline]
fn set_underline(&mut self, underline: bool) -> Result<(), DisplayError> {
self.queue_command(SetAttribute(
if underline {
Attribute::Underlined
}
else {
Attribute::NoUnderline
},
))
}
#[inline]
fn set_reverse(&mut self, reverse: bool) -> Result<(), DisplayError> {
self.queue_command(SetAttribute(
if reverse {
Attribute::Reverse
}
else {
Attribute::NoReverse
},
))
}
#[inline]
fn get_size(&self) -> Size {
size().map_or_else(
|_| Size::new(0, 0),
|(width, height)| Size::new(usize::from(width), usize::from(height)),
)
}
#[inline]
fn move_to_column(&mut self, x: u16) -> Result<(), DisplayError> {
self.queue_command(MoveToColumn(x))
}
#[inline]
fn move_next_line(&mut self) -> Result<(), DisplayError> {
self.queue_command(MoveToNextLine(1))
}
#[inline]
fn start(&mut self) -> Result<(), DisplayError> {
self.queue_command(EnterAlternateScreen)?;
self.queue_command(DisableLineWrap)?;
self.queue_command(Hide)?;
self.queue_command(EnableMouseCapture)?;
// this will fail on terminals without support, so ignore any errors
let _command_result = self.queue_command(PushKeyboardEnhancementFlags(
KeyboardEnhancementFlags::DISAMBIGUATE_ESCAPE_CODES
| KeyboardEnhancementFlags::REPORT_EVENT_TYPES
| KeyboardEnhancementFlags::REPORT_ALTERNATE_KEYS
| KeyboardEnhancementFlags::REPORT_ALL_KEYS_AS_ESCAPE_CODES,
));
enable_raw_mode().map_err(DisplayError::Unexpected)?;
self.flush()
}
#[inline]
fn end(&mut self) -> Result<(), DisplayError> {
// this will fail on terminals without support, so ignore any errors
let _command_result = self.queue_command(PopKeyboardEnhancementFlags);
self.queue_command(DisableMouseCapture)?;
self.queue_command(Show)?;
self.queue_command(EnableLineWrap)?;
self.queue_command(LeaveAlternateScreen)?;
disable_raw_mode().map_err(DisplayError::Unexpected)?;
self.flush()
}
}
impl CrossTerm {
/// Create a new instance.
#[inline]
#[must_use]
pub(crate) fn new() -> Self {
Self {
window: BufWriter::new(stdout()),
color_mode: detect_color_mode(available_color_count()),
}
}
fn queue_command(&mut self, command: impl Command) -> Result<(), DisplayError> {
let _result = self.window.queue(command).map_err(DisplayError::Unexpected)?;
Ok(())
}
}
|
