Add configurable crosshairs to Alacritty.

This allows the user to put semitransparent rectangles around the
current cursor line and column, á la Vim's cursor line/column, but
for the whole terminal.

1 files changed, 34 insertions, 34 deletions

diff --git a/alacritty/src/display/cursor.rs b/alacritty/src/display/cursor.rs
index f3a782cc..6415f152 100644
--- a/alacritty/src/display/cursor.rs
+++ b/alacritty/src/display/cursor.rs
@@ -6,15 +6,16 @@ use alacritty_terminal::term::SizeInfo;
 
 use crate::display::content::RenderableCursor;
 use crate::renderer::rects::RenderRect;
+use std::vec::Vec;
 
 /// Trait for conversion into the iterator.
 pub trait IntoRects {
     /// Consume the cursor for an iterator of rects.
-    fn rects(self, size_info: &SizeInfo, thickness: f32) -> CursorRects;
+    fn rects(self, size_info: &SizeInfo, thickness: f32) -> Vec<RenderRect>;
 }
 
 impl IntoRects for RenderableCursor {
-    fn rects(self, size_info: &SizeInfo, thickness: f32) -> CursorRects {
+    fn rects(self, size_info: &SizeInfo, thickness: f32) -> Vec<RenderRect> {
         let point = self.point();
         let x = point.column.0 as f32 * size_info.cell_width() + size_info.padding_x();
         let y = point.line as f32 * size_info.cell_height() + size_info.padding_y();
@@ -28,51 +29,53 @@ impl IntoRects for RenderableCursor {
             width *= 2.;
         }
 
-        match self.shape() {
+        let mut crosshairs = if self.cursor_crosshairs().enable {
+            crosshair(x, y, size_info, self.cursor_crosshairs().color, self.cursor_crosshairs().opacity.as_f32())
+        } else {
+            vec![]
+        };
+
+        let mut shape = match self.shape() {
             CursorShape::Beam => beam(x, y, height, thickness, self.color()),
             CursorShape::Underline => underline(x, y, width, height, thickness, self.color()),
             CursorShape::HollowBlock => hollow(x, y, width, height, thickness, self.color()),
-            _ => CursorRects::default(),
-        }
-    }
-}
+            CursorShape::Hidden => vec![],
+            _ => vec![],
+        };
 
-/// Cursor rect iterator.
-#[derive(Default)]
-pub struct CursorRects {
-    rects: [Option<RenderRect>; 4],
-    index: usize,
-}
-
-impl From<RenderRect> for CursorRects {
-    fn from(rect: RenderRect) -> Self {
-        Self { rects: [Some(rect), None, None, None], index: 0 }
+        shape.append(&mut crosshairs);
+        shape
     }
 }
 
-impl Iterator for CursorRects {
-    type Item = RenderRect;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        let rect = self.rects.get_mut(self.index)?;
-        self.index += 1;
-        rect.take()
-    }
+fn crosshair(x: f32, y: f32, size_info: &SizeInfo, color: Rgb, opacity: f32) -> Vec<RenderRect> {
+    let width = size_info.cell_width();
+    let height = size_info.cell_height();
+    let yskip = 0.;
+    let xskip = 0.;
+
+    vec![
+        RenderRect::new(x, 0., width, y + size_info.cell_height(), color, opacity),
+        RenderRect::new(
+            x, y + size_info.cell_height() * (yskip + 1.), width, size_info.height(), color, opacity),
+        RenderRect::new(0., y, x - (size_info.cell_width() * xskip), height, color, opacity),
+        RenderRect::new(x + size_info.cell_width() * (xskip + 1.), y, size_info.width(), height, color, opacity)
+    ]
 }
 
 /// Create an iterator yielding a single beam rect.
-fn beam(x: f32, y: f32, height: f32, thickness: f32, color: Rgb) -> CursorRects {
-    RenderRect::new(x, y, thickness, height, color, 1.).into()
+fn beam(x: f32, y: f32, height: f32, thickness: f32, color: Rgb) -> Vec<RenderRect> {
+    vec![RenderRect::new(x, y, thickness, height, color, 1.)]
 }
 
 /// Create an iterator yielding a single underline rect.
-fn underline(x: f32, y: f32, width: f32, height: f32, thickness: f32, color: Rgb) -> CursorRects {
+fn underline(x: f32, y: f32, width: f32, height: f32, thickness: f32, color: Rgb) -> Vec<RenderRect> {
     let y = y + height - thickness;
-    RenderRect::new(x, y, width, thickness, color, 1.).into()
+    vec![RenderRect::new(x, y, width, thickness, color, 1.)]
 }
 
 /// Create an iterator yielding a rect for each side of the hollow block cursor.
-fn hollow(x: f32, y: f32, width: f32, height: f32, thickness: f32, color: Rgb) -> CursorRects {
+fn hollow(x: f32, y: f32, width: f32, height: f32, thickness: f32, color: Rgb) -> Vec<RenderRect> {
     let top_line = RenderRect::new(x, y, width, thickness, color, 1.);
 
     let vertical_y = y + thickness;
@@ -85,8 +88,5 @@ fn hollow(x: f32, y: f32, width: f32, height: f32, thickness: f32, color: Rgb) -
     let right_x = x + width - thickness;
     let right_line = RenderRect::new(right_x, vertical_y, thickness, vertical_height, color, 1.);
 
-    CursorRects {
-        rects: [Some(top_line), Some(bottom_line), Some(left_line), Some(right_line)],
-        index: 0,
-    }
+    vec![top_line, bottom_line, left_line, right_line]
 }