1 files changed, 128 insertions, 1 deletions

diff --git a/tui-react/src/lib.rs b/tui-react/src/lib.rs
index b7d5b94..de9fad1 100644
--- a/tui-react/src/lib.rs
+++ b/tui-react/src/lib.rs
@@ -7,7 +7,9 @@ pub use list::*;
 pub use terminal::*;
 
 use std::iter::repeat;
-use tui::{self, buffer::Buffer, layout::Rect, style::Color};
+use tui::{self, buffer::Buffer, layout::Rect, style::Color, style::Style};
+use unicode_segmentation::UnicodeSegmentation;
+use unicode_width::UnicodeWidthStr;
 
 pub fn fill_background_to_right(mut s: String, entire_width: u16) -> String {
     match (s.len(), entire_width as usize) {
@@ -27,3 +29,128 @@ pub fn fill_background(area: Rect, buf: &mut Buffer, color: Color) {
         }
     }
 }
+
+pub fn draw_text_with_ellipsis_nowrap<'a>(
+    bound: Rect,
+    buf: &mut Buffer,
+    text: impl AsRef<str>,
+    style: impl Into<Option<Style>>,
+) -> u16 {
+    let s = style.into();
+    let t = text.as_ref();
+    let mut graphemes = t.graphemes(true);
+    let mut total_width = 0;
+    {
+        let mut ellipsis_candidate_x = None;
+        let mut x_offset = 0;
+        for (g, mut x) in graphemes.by_ref().zip(bound.left()..bound.right()) {
+            let width = g.width();
+            total_width += width;
+
+            x += x_offset;
+            let cell = buf.get_mut(x, bound.y);
+            if x + 1 == bound.right() {
+                ellipsis_candidate_x = Some(x);
+            }
+            cell.symbol = g.into();
+            if let Some(s) = s {
+                cell.style = s;
+            }
+
+            x_offset += width.saturating_sub(1) as u16;
+            if x + x_offset >= bound.right() {
+                break;
+            }
+            let x = x as usize;
+            for x in x + 1..x + width {
+                let i = buf.index_of(x as u16, bound.y);
+                buf.content[i].reset();
+            }
+        }
+        if let (Some(_), Some(x)) = (graphemes.next(), ellipsis_candidate_x) {
+            buf.get_mut(x, bound.y).symbol = "…".into();
+        }
+    }
+    total_width as u16
+}
+
+pub fn draw_text_nowrap_fn(
+    bound: Rect,
+    buf: &mut Buffer,
+    t: impl AsRef<str>,
+    mut s: impl FnMut(&str, u16, u16) -> Style,
+) {
+    if bound.width == 0 {
+        return;
+    }
+    for (g, x) in t.as_ref().graphemes(true).zip(bound.left()..bound.right()) {
+        let cell = buf.get_mut(x, bound.y);
+        cell.symbol = g.into();
+        cell.style = s(&cell.symbol, x, bound.y);
+    }
+}
+
+pub mod util {
+    use unicode_segmentation::UnicodeSegmentation;
+    use unicode_width::UnicodeWidthStr;
+
+    pub fn sanitize_offset(offset: u16, num_items: usize, num_displayable_lines: u16) -> u16 {
+        offset.min((num_items.saturating_sub(num_displayable_lines as usize)) as u16)
+    }
+
+    #[derive(Default)]
+    pub struct GraphemeCountWriter(pub usize);
+
+    impl std::io::Write for GraphemeCountWriter {
+        fn write(&mut self, buf: &[u8]) -> Result<usize, std::io::Error> {
+            self.0 += String::from_utf8_lossy(buf).graphemes(true).count();
+            Ok(buf.len())
+        }
+
+        fn flush(&mut self) -> Result<(), std::io::Error> {
+            Ok(())
+        }
+    }
+
+    pub fn block_width(s: &str) -> u16 {
+        s.graphemes(true).map(|g| g.width()).sum::<usize>() as u16
+    }
+
+    pub mod rect {
+        use tui::layout::Rect;
+
+        /// A safe version of Rect::intersection that doesn't suffer from underflows
+        pub fn intersect(lhs: Rect, rhs: Rect) -> Rect {
+            let x1 = lhs.x.max(rhs.x);
+            let y1 = lhs.y.max(rhs.y);
+            let x2 = lhs.right().min(rhs.right());
+            let y2 = lhs.bottom().min(rhs.bottom());
+            Rect {
+                x: x1,
+                y: y1,
+                width: x2.saturating_sub(x1),
+                height: y2.saturating_sub(y1),
+            }
+        }
+
+        pub fn offset_x(r: Rect, offset: u16) -> Rect {
+            Rect {
+                x: r.x + offset,
+                width: r.width.saturating_sub(offset),
+                ..r
+            }
+        }
+
+        pub fn snap_to_right(bound: Rect, new_width: u16) -> Rect {
+            offset_x(bound, bound.width.saturating_sub(new_width))
+        }
+
+        pub fn line_bound(bound: Rect, line: usize) -> Rect {
+            Rect {
+                y: bound.y + line as u16,
+                height: 1,
+                ..bound
+            }
+        }
+    }
+}