Proper line killing algo

1 files changed, 18 insertions, 1 deletions

diff --git a/src/Buffer.zig b/src/Buffer.zig
index 57ecd20..f9a1576 100644
--- a/src/Buffer.zig
+++ b/src/Buffer.zig
@@ -358,7 +358,24 @@ pub fn insertRow(self: *Buffer, at: usize, data: []const u8) !void {
 }
 
 pub fn killLine(self: *Buffer) !void {
-    return self.deleteRow(self.cy);
+    if (self.cy == self.rows.items.len) {
+        return;
+    }
+
+    var row = &self.rows.items[self.cy];
+    if (self.cx == row.data.items.len) {
+        if (self.cy == self.rows.items.len - 1) {
+            return;
+        }
+
+        try row.appendString(self, self.rows.items[self.cy+1].data.items);
+        self.deleteRow(self.cy + 1);
+    } else {
+        try row.data.resize(self.cx);
+    }
+
+    self.dirty = true;
+    return row.update(self);
 }
 
 pub fn lineNumberDigits(self: Buffer) usize {