fix: refresh diff colors on terminal theme changes

vendor/crossterm/src/cursor/sys/unix.rs

@@ -0,0 +1,56 @@
+use std::{
+    io::{self, Error, ErrorKind, Write},
+    time::Duration,
+};
+
+use crate::{
+    event::{filter::CursorPositionFilter, poll_internal, read_internal, InternalEvent},
+    terminal::{disable_raw_mode, enable_raw_mode, sys::is_raw_mode_enabled},
+};
+
+/// Returns the cursor position (column, row).
+///
+/// The top left cell is represented as `(0, 0)`.
+///
+/// On unix systems, this function will block and possibly time out while
+/// [`crossterm::event::read`](crate::event::read) or [`crossterm::event::poll`](crate::event::poll) are being called.
+pub fn position() -> io::Result<(u16, u16)> {
+    if is_raw_mode_enabled() {
+        read_position_raw()
+    } else {
+        read_position()
+    }
+}
+
+fn read_position() -> io::Result<(u16, u16)> {
+    enable_raw_mode()?;
+    let pos = read_position_raw();
+    disable_raw_mode()?;
+    pos
+}
+
+fn read_position_raw() -> io::Result<(u16, u16)> {
+    // Use `ESC [ 6 n` to and retrieve the cursor position.
+    let mut stdout = io::stdout();
+    stdout.write_all(b"\x1B[6n")?;
+    stdout.flush()?;
+
+    loop {
+        match poll_internal(Some(Duration::from_millis(2000)), &CursorPositionFilter) {
+            Ok(true) => {
+                if let Ok(InternalEvent::CursorPosition(x, y)) =
+                    read_internal(&CursorPositionFilter)
+                {
+                    return Ok((x, y));
+                }
+            }
+            Ok(false) => {
+                return Err(Error::new(
+                    ErrorKind::Other,
+                    "The cursor position could not be read within a normal duration",
+                ));
+            }
+            Err(_) => {}
+        }
+    }
+}