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-rw-r--r--helix-tui/src/backend/crossterm.rs221
-rw-r--r--helix-tui/src/backend/mod.rs25
-rw-r--r--helix-tui/src/backend/test.rs151
3 files changed, 397 insertions, 0 deletions
diff --git a/helix-tui/src/backend/crossterm.rs b/helix-tui/src/backend/crossterm.rs
new file mode 100644
index 00000000..f6703e14
--- /dev/null
+++ b/helix-tui/src/backend/crossterm.rs
@@ -0,0 +1,221 @@
+use crate::{
+ backend::Backend,
+ buffer::Cell,
+ layout::Rect,
+ style::{Color, Modifier},
+};
+use crossterm::{
+ cursor::{Hide, MoveTo, Show},
+ execute, queue,
+ style::{
+ Attribute as CAttribute, Color as CColor, Print, SetAttribute, SetBackgroundColor,
+ SetForegroundColor,
+ },
+ terminal::{self, Clear, ClearType},
+};
+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) -> io::Result<()> {
+ map_error(execute!(self.buffer, Show))
+ }
+
+ 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()))
+}
+
+impl From<Color> for CColor {
+ fn from(color: Color) -> Self {
+ match color {
+ Color::Reset => CColor::Reset,
+ Color::Black => CColor::Black,
+ Color::Red => CColor::DarkRed,
+ Color::Green => CColor::DarkGreen,
+ Color::Yellow => CColor::DarkYellow,
+ Color::Blue => CColor::DarkBlue,
+ Color::Magenta => CColor::DarkMagenta,
+ Color::Cyan => CColor::DarkCyan,
+ Color::Gray => CColor::Grey,
+ Color::DarkGray => CColor::DarkGrey,
+ Color::LightRed => CColor::Red,
+ Color::LightGreen => CColor::Green,
+ Color::LightBlue => CColor::Blue,
+ Color::LightYellow => CColor::Yellow,
+ Color::LightMagenta => CColor::Magenta,
+ Color::LightCyan => CColor::Cyan,
+ Color::White => CColor::White,
+ Color::Indexed(i) => CColor::AnsiValue(i),
+ Color::Rgb(r, g, b) => CColor::Rgb { r, g, b },
+ }
+ }
+}
+
+#[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(())
+ }
+}
diff --git a/helix-tui/src/backend/mod.rs b/helix-tui/src/backend/mod.rs
new file mode 100644
index 00000000..ed125200
--- /dev/null
+++ b/helix-tui/src/backend/mod.rs
@@ -0,0 +1,25 @@
+use std::io;
+
+use crate::buffer::Cell;
+use crate::layout::Rect;
+
+#[cfg(feature = "crossterm")]
+mod crossterm;
+#[cfg(feature = "crossterm")]
+pub use self::crossterm::CrosstermBackend;
+
+mod test;
+pub use self::test::TestBackend;
+
+pub trait Backend {
+ fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
+ where
+ I: Iterator<Item = (u16, u16, &'a Cell)>;
+ fn hide_cursor(&mut self) -> Result<(), io::Error>;
+ fn show_cursor(&mut self) -> Result<(), io::Error>;
+ fn get_cursor(&mut self) -> Result<(u16, u16), io::Error>;
+ fn set_cursor(&mut self, x: u16, y: u16) -> Result<(), io::Error>;
+ fn clear(&mut self) -> Result<(), io::Error>;
+ fn size(&self) -> Result<Rect, io::Error>;
+ fn flush(&mut self) -> Result<(), io::Error>;
+}
diff --git a/helix-tui/src/backend/test.rs b/helix-tui/src/backend/test.rs
new file mode 100644
index 00000000..46b37261
--- /dev/null
+++ b/helix-tui/src/backend/test.rs
@@ -0,0 +1,151 @@
+use crate::{
+ backend::Backend,
+ buffer::{Buffer, Cell},
+ layout::Rect,
+};
+use std::{fmt::Write, io};
+use unicode_width::UnicodeWidthStr;
+
+/// A backend used for the integration tests.
+#[derive(Debug)]
+pub struct TestBackend {
+ width: u16,
+ buffer: Buffer,
+ height: u16,
+ cursor: bool,
+ pos: (u16, u16),
+}
+
+/// Returns a string representation of the given buffer for debugging purpose.
+fn buffer_view(buffer: &Buffer) -> String {
+ let mut view = String::with_capacity(buffer.content.len() + buffer.area.height as usize * 3);
+ for cells in buffer.content.chunks(buffer.area.width as usize) {
+ let mut overwritten = vec![];
+ let mut skip: usize = 0;
+ view.push('"');
+ for (x, c) in cells.iter().enumerate() {
+ if skip == 0 {
+ view.push_str(&c.symbol);
+ } else {
+ overwritten.push((x, &c.symbol))
+ }
+ skip = std::cmp::max(skip, c.symbol.width()).saturating_sub(1);
+ }
+ view.push('"');
+ if !overwritten.is_empty() {
+ write!(
+ &mut view,
+ " Hidden by multi-width symbols: {:?}",
+ overwritten
+ )
+ .unwrap();
+ }
+ view.push('\n');
+ }
+ view
+}
+
+impl TestBackend {
+ pub fn new(width: u16, height: u16) -> TestBackend {
+ TestBackend {
+ width,
+ height,
+ buffer: Buffer::empty(Rect::new(0, 0, width, height)),
+ cursor: false,
+ pos: (0, 0),
+ }
+ }
+
+ pub fn buffer(&self) -> &Buffer {
+ &self.buffer
+ }
+
+ pub fn resize(&mut self, width: u16, height: u16) {
+ self.buffer.resize(Rect::new(0, 0, width, height));
+ self.width = width;
+ self.height = height;
+ }
+
+ pub fn assert_buffer(&self, expected: &Buffer) {
+ assert_eq!(expected.area, self.buffer.area);
+ let diff = expected.diff(&self.buffer);
+ if diff.is_empty() {
+ return;
+ }
+
+ let mut debug_info = String::from("Buffers are not equal");
+ debug_info.push('\n');
+ debug_info.push_str("Expected:");
+ debug_info.push('\n');
+ let expected_view = buffer_view(expected);
+ debug_info.push_str(&expected_view);
+ debug_info.push('\n');
+ debug_info.push_str("Got:");
+ debug_info.push('\n');
+ let view = buffer_view(&self.buffer);
+ debug_info.push_str(&view);
+ debug_info.push('\n');
+
+ debug_info.push_str("Diff:");
+ debug_info.push('\n');
+ let nice_diff = diff
+ .iter()
+ .enumerate()
+ .map(|(i, (x, y, cell))| {
+ let expected_cell = expected.get(*x, *y);
+ format!(
+ "{}: at ({}, {}) expected {:?} got {:?}",
+ i, x, y, expected_cell, cell
+ )
+ })
+ .collect::<Vec<String>>()
+ .join("\n");
+ debug_info.push_str(&nice_diff);
+ panic!("{}", debug_info);
+ }
+}
+
+impl Backend for TestBackend {
+ fn draw<'a, I>(&mut self, content: I) -> Result<(), io::Error>
+ where
+ I: Iterator<Item = (u16, u16, &'a Cell)>,
+ {
+ for (x, y, c) in content {
+ let cell = self.buffer.get_mut(x, y);
+ *cell = c.clone();
+ }
+ Ok(())
+ }
+
+ fn hide_cursor(&mut self) -> Result<(), io::Error> {
+ self.cursor = false;
+ Ok(())
+ }
+
+ fn show_cursor(&mut self) -> Result<(), io::Error> {
+ self.cursor = true;
+ Ok(())
+ }
+
+ fn get_cursor(&mut self) -> Result<(u16, u16), io::Error> {
+ Ok(self.pos)
+ }
+
+ fn set_cursor(&mut self, x: u16, y: u16) -> Result<(), io::Error> {
+ self.pos = (x, y);
+ Ok(())
+ }
+
+ fn clear(&mut self) -> Result<(), io::Error> {
+ self.buffer.reset();
+ Ok(())
+ }
+
+ fn size(&self) -> Result<Rect, io::Error> {
+ Ok(Rect::new(0, 0, self.width, self.height))
+ }
+
+ fn flush(&mut self) -> Result<(), io::Error> {
+ Ok(())
+ }
+}