bendns' repos / helix
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'helix-tui/src/backend/crossterm.rs')
-rw-r--r--helix-tui/src/backend/crossterm.rs197
1 files changed, 0 insertions, 197 deletions
diff --git a/helix-tui/src/backend/crossterm.rs b/helix-tui/src/backend/crossterm.rs
deleted file mode 100644
index eff098b3..00000000
--- a/helix-tui/src/backend/crossterm.rs
+++ /dev/null
@@ -1,197 +0,0 @@
-use crate::{backend::Backend, buffer::Cell};
-use crossterm::{
- cursor::{CursorShape, Hide, MoveTo, SetCursorShape, Show},
- execute, queue,
- style::{
- Attribute as CAttribute, Color as CColor, Print, SetAttribute, SetBackgroundColor,
- SetForegroundColor,
- },
- terminal::{self, Clear, ClearType},
-};
-use helix_view::graphics::{Color, CursorKind, Modifier, Rect};
-use std::io::{self, Write};
-
-pub struct CrosstermBackend<W: Write> {
- buffer: W,
-}
-
-impl<W> CrosstermBackend<W>
-where
- W: Write,
-{
- pub fn new(buffer: W) -> CrosstermBackend<W> {
- CrosstermBackend { buffer }
- }
-}
-
-impl<W> Write for CrosstermBackend<W>
-where
- W: Write,
-{
- fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
- self.buffer.write(buf)
- }
-
- fn flush(&mut self) -> io::Result<()> {
- self.buffer.flush()
- }
-}
-
-impl<W> Backend for CrosstermBackend<W>
-where
- W: Write,
-{
- fn draw<'a, I>(&mut self, content: I) -> io::Result<()>
- where
- I: Iterator<Item = (u16, u16, &'a Cell)>,
- {
- let mut fg = Color::Reset;
- let mut bg = Color::Reset;
- let mut modifier = Modifier::empty();
- let mut last_pos: Option<(u16, u16)> = None;
- for (x, y, cell) in content {
- // Move the cursor if the previous location was not (x - 1, y)
- if !matches!(last_pos, Some(p) if x == p.0 + 1 && y == p.1) {
- map_error(queue!(self.buffer, MoveTo(x, y)))?;
- }
- last_pos = Some((x, y));
- if cell.modifier != modifier {
- let diff = ModifierDiff {
- from: modifier,
- to: cell.modifier,
- };
- diff.queue(&mut self.buffer)?;
- modifier = cell.modifier;
- }
- if cell.fg != fg {
- let color = CColor::from(cell.fg);
- map_error(queue!(self.buffer, SetForegroundColor(color)))?;
- fg = cell.fg;
- }
- if cell.bg != bg {
- let color = CColor::from(cell.bg);
- map_error(queue!(self.buffer, SetBackgroundColor(color)))?;
- bg = cell.bg;
- }
-
- map_error(queue!(self.buffer, Print(&cell.symbol)))?;
- }
-
- map_error(queue!(
- self.buffer,
- SetForegroundColor(CColor::Reset),
- SetBackgroundColor(CColor::Reset),
- SetAttribute(CAttribute::Reset)
- ))
- }
-
- fn hide_cursor(&mut self) -> io::Result<()> {
- map_error(execute!(self.buffer, Hide))
- }
-
- fn show_cursor(&mut self, kind: CursorKind) -> io::Result<()> {
- let shape = match kind {
- CursorKind::Block => CursorShape::Block,
- CursorKind::Bar => CursorShape::Line,
- CursorKind::Underline => CursorShape::UnderScore,
- CursorKind::Hidden => unreachable!(),
- };
- map_error(execute!(self.buffer, Show, SetCursorShape(shape)))
- }
-
- fn get_cursor(&mut self) -> io::Result<(u16, u16)> {
- crossterm::cursor::position()
- .map_err(|e| io::Error::new(io::ErrorKind::Other, e.to_string()))
- }
-
- fn set_cursor(&mut self, x: u16, y: u16) -> io::Result<()> {
- map_error(execute!(self.buffer, MoveTo(x, y)))
- }
-
- fn clear(&mut self) -> io::Result<()> {
- map_error(execute!(self.buffer, Clear(ClearType::All)))
- }
-
- fn size(&self) -> io::Result<Rect> {
- let (width, height) =
- terminal::size().map_err(|e| io::Error::new(io::ErrorKind::Other, e.to_string()))?;
-
- Ok(Rect::new(0, 0, width, height))
- }
-
- fn flush(&mut self) -> io::Result<()> {
- self.buffer.flush()
- }
-}
-
-fn map_error(error: crossterm::Result<()>) -> io::Result<()> {
- error.map_err(|e| io::Error::new(io::ErrorKind::Other, e.to_string()))
-}
-
-#[derive(Debug)]
-struct ModifierDiff {
- pub from: Modifier,
- pub to: Modifier,
-}
-
-impl ModifierDiff {
- fn queue<W>(&self, mut w: W) -> io::Result<()>
- where
- W: io::Write,
- {
- //use crossterm::Attribute;
- let removed = self.from - self.to;
- if removed.contains(Modifier::REVERSED) {
- map_error(queue!(w, SetAttribute(CAttribute::NoReverse)))?;
- }
- if removed.contains(Modifier::BOLD) {
- map_error(queue!(w, SetAttribute(CAttribute::NormalIntensity)))?;
- if self.to.contains(Modifier::DIM) {
- map_error(queue!(w, SetAttribute(CAttribute::Dim)))?;
- }
- }
- if removed.contains(Modifier::ITALIC) {
- map_error(queue!(w, SetAttribute(CAttribute::NoItalic)))?;
- }
- if removed.contains(Modifier::UNDERLINED) {
- map_error(queue!(w, SetAttribute(CAttribute::NoUnderline)))?;
- }
- if removed.contains(Modifier::DIM) {
- map_error(queue!(w, SetAttribute(CAttribute::NormalIntensity)))?;
- }
- if removed.contains(Modifier::CROSSED_OUT) {
- map_error(queue!(w, SetAttribute(CAttribute::NotCrossedOut)))?;
- }
- if removed.contains(Modifier::SLOW_BLINK) || removed.contains(Modifier::RAPID_BLINK) {
- map_error(queue!(w, SetAttribute(CAttribute::NoBlink)))?;
- }
-
- let added = self.to - self.from;
- if added.contains(Modifier::REVERSED) {
- map_error(queue!(w, SetAttribute(CAttribute::Reverse)))?;
- }
- if added.contains(Modifier::BOLD) {
- map_error(queue!(w, SetAttribute(CAttribute::Bold)))?;
- }
- if added.contains(Modifier::ITALIC) {
- map_error(queue!(w, SetAttribute(CAttribute::Italic)))?;
- }
- if added.contains(Modifier::UNDERLINED) {
- map_error(queue!(w, SetAttribute(CAttribute::Underlined)))?;
- }
- if added.contains(Modifier::DIM) {
- map_error(queue!(w, SetAttribute(CAttribute::Dim)))?;
- }
- if added.contains(Modifier::CROSSED_OUT) {
- map_error(queue!(w, SetAttribute(CAttribute::CrossedOut)))?;
- }
- if added.contains(Modifier::SLOW_BLINK) {
- map_error(queue!(w, SetAttribute(CAttribute::SlowBlink)))?;
- }
- if added.contains(Modifier::RAPID_BLINK) {
- map_error(queue!(w, SetAttribute(CAttribute::RapidBlink)))?;
- }
-
- Ok(())
- }
-}