remove current_cell/current_cell_mut

it had an unstated precondition that the cursor was not positioned off
the end of a row, which happened to be true in all existing uses, but
was hard to verify. moving the unwrap out to the call site makes it
easier to audit each use.

2 files changed, 6 insertions, 15 deletions

diff --git a/src/grid.rs b/src/grid.rs
index de98da1..085e744 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -171,16 +171,6 @@ impl Grid {
             .and_then(|r| r.get_mut(pos.col))
     }
 
-    pub fn current_cell(&self) -> &crate::cell::Cell {
-        self.drawing_cell(self.pos)
-            .expect("cursor not pointing to a cell")
-    }
-
-    pub fn current_cell_mut(&mut self) -> &mut crate::cell::Cell {
-        self.drawing_cell_mut(self.pos)
-            .expect("cursor not pointing to a cell")
-    }
-
     pub fn scrollback_len(&self) -> usize {
         self.scrollback_len
     }
@@ -458,8 +448,8 @@ impl Grid {
     pub fn insert_cells(&mut self, count: u16) {
         let size = self.size;
         let pos = self.pos;
-        let wide =
-            pos.col < size.cols && self.current_cell().is_wide_continuation();
+        let wide = pos.col < size.cols
+            && self.drawing_cell(pos).unwrap().is_wide_continuation();
         let row = self.current_row_mut();
         for _ in 0..count {
             if wide {
diff --git a/src/screen.rs b/src/screen.rs
index 6c3d629..9e81ee2 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -906,12 +906,12 @@ impl Screen {
                 next_cell.set(' ', attrs);
             }
 
-            let cell = self.grid_mut().current_cell_mut();
+            let cell = self.grid_mut().drawing_cell_mut(pos).unwrap();
             cell.set(c, attrs);
             self.grid_mut().col_inc(1);
             if width > 1 {
                 let pos = self.grid().pos();
-                if self.grid().current_cell().is_wide() {
+                if self.grid().drawing_cell(pos).unwrap().is_wide() {
                     let next_next_pos = crate::grid::Pos {
                         row: pos.row,
                         col: pos.col + 1,
@@ -928,7 +928,8 @@ impl Screen {
                             .wrap(false);
                     }
                 }
-                let next_cell = self.grid_mut().current_cell_mut();
+                let next_cell =
+                    self.grid_mut().drawing_cell_mut(pos).unwrap();
                 next_cell.clear(crate::attrs::Attrs::default());
                 next_cell.set_wide_continuation(true);
                 self.grid_mut().col_inc(1);