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-rw-r--r--helix-tui/src/backend/crossterm.rs126
-rw-r--r--helix-tui/src/buffer.rs23
-rw-r--r--helix-tui/src/text.rs8
3 files changed, 145 insertions, 12 deletions
diff --git a/helix-tui/src/backend/crossterm.rs b/helix-tui/src/backend/crossterm.rs
index eff098b3..7c7250fa 100644
--- a/helix-tui/src/backend/crossterm.rs
+++ b/helix-tui/src/backend/crossterm.rs
@@ -7,12 +7,45 @@ use crossterm::{
SetForegroundColor,
},
terminal::{self, Clear, ClearType},
+ Command,
};
-use helix_view::graphics::{Color, CursorKind, Modifier, Rect};
-use std::io::{self, Write};
+use helix_view::graphics::{Color, CursorKind, Modifier, Rect, UnderlineStyle};
+use std::{
+ fmt,
+ io::{self, Write},
+};
+fn vte_version() -> Option<usize> {
+ std::env::var("VTE_VERSION").ok()?.parse().ok()
+}
+
+/// Describes terminal capabilities like extended underline, truecolor, etc.
+#[derive(Copy, Clone, Debug, Default)]
+struct Capabilities {
+ /// Support for undercurled, underdashed, etc.
+ has_extended_underlines: bool,
+}
+
+impl Capabilities {
+ /// Detect capabilities from the terminfo database located based
+ /// on the $TERM environment variable. If detection fails, returns
+ /// a default value where no capability is supported.
+ pub fn from_env_or_default() -> Self {
+ match termini::TermInfo::from_env() {
+ Err(_) => Capabilities::default(),
+ Ok(t) => Capabilities {
+ // Smulx, VTE: https://unix.stackexchange.com/a/696253/246284
+ // Su (used by kitty): https://sw.kovidgoyal.net/kitty/underlines
+ has_extended_underlines: t.extended_cap("Smulx").is_some()
+ || t.extended_cap("Su").is_some()
+ || vte_version() >= Some(5102),
+ },
+ }
+ }
+}
pub struct CrosstermBackend<W: Write> {
buffer: W,
+ capabilities: Capabilities,
}
impl<W> CrosstermBackend<W>
@@ -20,7 +53,10 @@ where
W: Write,
{
pub fn new(buffer: W) -> CrosstermBackend<W> {
- CrosstermBackend { buffer }
+ CrosstermBackend {
+ buffer,
+ capabilities: Capabilities::from_env_or_default(),
+ }
}
}
@@ -47,6 +83,8 @@ where
{
let mut fg = Color::Reset;
let mut bg = Color::Reset;
+ let mut underline_color = Color::Reset;
+ let mut underline_style = UnderlineStyle::Reset;
let mut modifier = Modifier::empty();
let mut last_pos: Option<(u16, u16)> = None;
for (x, y, cell) in content {
@@ -74,11 +112,32 @@ where
bg = cell.bg;
}
+ let mut new_underline_style = cell.underline_style;
+ if self.capabilities.has_extended_underlines {
+ if cell.underline_color != underline_color {
+ let color = CColor::from(cell.underline_color);
+ map_error(queue!(self.buffer, SetUnderlineColor(color)))?;
+ underline_color = cell.underline_color;
+ }
+ } else {
+ match new_underline_style {
+ UnderlineStyle::Reset | UnderlineStyle::Line => (),
+ _ => new_underline_style = UnderlineStyle::Line,
+ }
+ }
+
+ if new_underline_style != underline_style {
+ let attr = CAttribute::from(new_underline_style);
+ map_error(queue!(self.buffer, SetAttribute(attr)))?;
+ underline_style = new_underline_style;
+ }
+
map_error(queue!(self.buffer, Print(&cell.symbol)))?;
}
map_error(queue!(
self.buffer,
+ SetUnderlineColor(CColor::Reset),
SetForegroundColor(CColor::Reset),
SetBackgroundColor(CColor::Reset),
SetAttribute(CAttribute::Reset)
@@ -153,9 +212,6 @@ impl ModifierDiff {
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)))?;
}
@@ -176,9 +232,6 @@ impl ModifierDiff {
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)))?;
}
@@ -195,3 +248,58 @@ impl ModifierDiff {
Ok(())
}
}
+
+/// Crossterm uses semicolon as a seperator for colors
+/// this is actually not spec compliant (altough commonly supported)
+/// However the correct approach is to use colons as a seperator.
+/// This usually doesn't make a difference for emulators that do support colored underlines.
+/// However terminals that do not support colored underlines will ignore underlines colors with colons
+/// while escape sequences with semicolons are always processed which leads to weird visual artifacts.
+/// See [this nvim issue](https://github.com/neovim/neovim/issues/9270) for details
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct SetUnderlineColor(pub CColor);
+
+impl Command for SetUnderlineColor {
+ fn write_ansi(&self, f: &mut impl fmt::Write) -> fmt::Result {
+ let color = self.0;
+
+ if color == CColor::Reset {
+ write!(f, "\x1b[59m")?;
+ return Ok(());
+ }
+ f.write_str("\x1b[58:")?;
+
+ let res = match color {
+ CColor::Black => f.write_str("5:0"),
+ CColor::DarkGrey => f.write_str("5:8"),
+ CColor::Red => f.write_str("5:9"),
+ CColor::DarkRed => f.write_str("5:1"),
+ CColor::Green => f.write_str("5:10"),
+ CColor::DarkGreen => f.write_str("5:2"),
+ CColor::Yellow => f.write_str("5:11"),
+ CColor::DarkYellow => f.write_str("5:3"),
+ CColor::Blue => f.write_str("5:12"),
+ CColor::DarkBlue => f.write_str("5:4"),
+ CColor::Magenta => f.write_str("5:13"),
+ CColor::DarkMagenta => f.write_str("5:5"),
+ CColor::Cyan => f.write_str("5:14"),
+ CColor::DarkCyan => f.write_str("5:6"),
+ CColor::White => f.write_str("5:15"),
+ CColor::Grey => f.write_str("5:7"),
+ CColor::Rgb { r, g, b } => write!(f, "2::{}:{}:{}", r, g, b),
+ CColor::AnsiValue(val) => write!(f, "5:{}", val),
+ _ => Ok(()),
+ };
+ res?;
+ write!(f, "m")?;
+ Ok(())
+ }
+
+ #[cfg(windows)]
+ fn execute_winapi(&self) -> crossterm::Result<()> {
+ Err(std::io::Error::new(
+ std::io::ErrorKind::Other,
+ "SetUnderlineColor not supported by winapi.",
+ ))
+ }
+}
diff --git a/helix-tui/src/buffer.rs b/helix-tui/src/buffer.rs
index 21c53aad..424e6d32 100644
--- a/helix-tui/src/buffer.rs
+++ b/helix-tui/src/buffer.rs
@@ -3,7 +3,7 @@ use helix_core::unicode::width::UnicodeWidthStr;
use std::cmp::min;
use unicode_segmentation::UnicodeSegmentation;
-use helix_view::graphics::{Color, Modifier, Rect, Style};
+use helix_view::graphics::{Color, Modifier, Rect, Style, UnderlineStyle};
/// A buffer cell
#[derive(Debug, Clone, PartialEq)]
@@ -11,6 +11,8 @@ pub struct Cell {
pub symbol: String,
pub fg: Color,
pub bg: Color,
+ pub underline_color: Color,
+ pub underline_style: UnderlineStyle,
pub modifier: Modifier,
}
@@ -44,6 +46,13 @@ impl Cell {
if let Some(c) = style.bg {
self.bg = c;
}
+ if let Some(c) = style.underline_color {
+ self.underline_color = c;
+ }
+ if let Some(style) = style.underline_style {
+ self.underline_style = style;
+ }
+
self.modifier.insert(style.add_modifier);
self.modifier.remove(style.sub_modifier);
self
@@ -53,6 +62,8 @@ impl Cell {
Style::default()
.fg(self.fg)
.bg(self.bg)
+ .underline_color(self.underline_color)
+ .underline_style(self.underline_style)
.add_modifier(self.modifier)
}
@@ -61,6 +72,8 @@ impl Cell {
self.symbol.push(' ');
self.fg = Color::Reset;
self.bg = Color::Reset;
+ self.underline_color = Color::Reset;
+ self.underline_style = UnderlineStyle::Reset;
self.modifier = Modifier::empty();
}
}
@@ -71,6 +84,8 @@ impl Default for Cell {
symbol: " ".into(),
fg: Color::Reset,
bg: Color::Reset,
+ underline_color: Color::Reset,
+ underline_style: UnderlineStyle::Reset,
modifier: Modifier::empty(),
}
}
@@ -87,7 +102,7 @@ impl Default for Cell {
///
/// ```
/// use helix_tui::buffer::{Buffer, Cell};
-/// use helix_view::graphics::{Rect, Color, Style, Modifier};
+/// use helix_view::graphics::{Rect, Color, UnderlineStyle, Style, Modifier};
///
/// let mut buf = Buffer::empty(Rect{x: 0, y: 0, width: 10, height: 5});
/// buf[(0, 2)].set_symbol("x");
@@ -97,7 +112,9 @@ impl Default for Cell {
/// symbol: String::from("r"),
/// fg: Color::Red,
/// bg: Color::White,
-/// modifier: Modifier::empty()
+/// underline_color: Color::Reset,
+/// underline_style: UnderlineStyle::Reset,
+/// modifier: Modifier::empty(),
/// });
/// buf[(5, 0)].set_char('x');
/// assert_eq!(buf[(5, 0)].symbol, "x");
diff --git a/helix-tui/src/text.rs b/helix-tui/src/text.rs
index 602090e5..1bfe5ee1 100644
--- a/helix-tui/src/text.rs
+++ b/helix-tui/src/text.rs
@@ -134,6 +134,8 @@ impl<'a> Span<'a> {
/// style: Style {
/// fg: Some(Color::Yellow),
/// bg: Some(Color::Black),
+ /// underline_color: None,
+ /// underline_style: None,
/// add_modifier: Modifier::empty(),
/// sub_modifier: Modifier::empty(),
/// },
@@ -143,6 +145,8 @@ impl<'a> Span<'a> {
/// style: Style {
/// fg: Some(Color::Yellow),
/// bg: Some(Color::Black),
+ /// underline_color: None,
+ /// underline_style: None,
/// add_modifier: Modifier::empty(),
/// sub_modifier: Modifier::empty(),
/// },
@@ -152,6 +156,8 @@ impl<'a> Span<'a> {
/// style: Style {
/// fg: Some(Color::Yellow),
/// bg: Some(Color::Black),
+ /// underline_color: None,
+ /// underline_style: None,
/// add_modifier: Modifier::empty(),
/// sub_modifier: Modifier::empty(),
/// },
@@ -161,6 +167,8 @@ impl<'a> Span<'a> {
/// style: Style {
/// fg: Some(Color::Yellow),
/// bg: Some(Color::Black),
+ /// underline_color: None,
+ /// underline_style: None,
/// add_modifier: Modifier::empty(),
/// sub_modifier: Modifier::empty(),
/// },
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-26 22:44:02 +0000